Investments in Associates - Summary (Details) - USD ($)
$ / shares in Units, $ in Millions |
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12 Months Ended |
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Feb. 16, 2026 |
May 13, 2025 |
Apr. 21, 2025 |
Dec. 20, 2024 |
Dec. 19, 2024 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
| Investments in Associates |
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| Fair value |
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$ 14,233.1
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$ 10,743.8
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| Associates and joint ventures |
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8,362.3
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7,153.3
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| Fairfax India investments in associates |
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1,615.3
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1,352.3
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| Total |
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9,977.6
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8,505.6
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$ 8,037.3
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| Share of profit (loss) of associates |
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$ 816.1
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$ 956.3
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| Consortium | Kennedy Wilson | Business combination |
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| Investments in Associates |
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| Cash consideration for acquisition of shares, per share |
$ 10.9
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| Maximum amount of funding commitment |
$ 1,650.0
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| Go Digit Infoworks Services Private Limited |
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| Investments in Associates |
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| Ownership percentage |
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49.00%
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49.00%
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| Insurance and reinsurance |
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| Investments in Associates |
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| Fair value |
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$ 1,078.7
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$ 745.9
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| Associates and joint ventures |
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839.4
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532.8
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| Total |
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839.4
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532.8
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| Share of profit (loss) of associates |
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$ 66.9
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$ 57.7
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| Insurance and reinsurance | Go Digit Infoworks Services Private Limited |
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| Investments in Associates |
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| Ownership percentage |
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49.00%
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49.00%
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| Fair value |
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$ 512.1
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$ 434.9
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| Associates and joint ventures |
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362.1
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325.3
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| Total |
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362.1
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325.3
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| Share of profit (loss) of associates |
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$ 55.1
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59.7
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| Insurance and reinsurance | Albingia SA |
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| Investments in Associates |
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| Ownership percentage |
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33.00%
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33.00%
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| Fair value |
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$ 246.3
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| Associates and joint ventures |
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254.0
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| Total |
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254.0
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| Share of profit (loss) of associates |
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7.5
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| Insurance and reinsurance | Other |
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| Investments in Associates |
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| Fair value |
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320.3
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311.0
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| Associates and joint ventures |
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223.3
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207.5
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| Total |
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223.3
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207.5
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| Share of profit (loss) of associates |
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4.3
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(2.0)
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| Non-insurance |
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| Investments in Associates |
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| Fair value |
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13,154.4
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9,997.9
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| Associates and joint ventures |
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7,522.9
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6,620.5
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| Fairfax India investments in associates |
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1,615.3
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1,352.3
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| Total |
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9,138.2
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7,972.8
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| Share of profit (loss) of associates |
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749.2
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898.6
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| Non-insurance | Quess Corp Limited |
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| Investments in Associates |
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| Ownership percentage |
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34.80%
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| Non-insurance | Peak Achievement Athletics, Inc. |
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| Investments in Associates |
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| Ownership percentage |
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100.00%
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42.60%
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| Non-insurance | India |
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| Investments in Associates |
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| Fair value |
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3,459.3
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3,050.1
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| Associates and joint ventures |
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410.3
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453.0
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| Fairfax India investments in associates |
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1,615.3
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1,352.3
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| Total |
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2,025.6
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1,805.3
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| Share of profit (loss) of associates |
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$ 58.3
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$ 52.4
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| Non-insurance | India | Bangalore International Airport Limited |
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| Investments in Associates |
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| Ownership percentage |
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74.00%
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64.00%
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| Fair value |
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$ 2,187.4
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$ 1,632.0
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| Fairfax India investments in associates |
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1,038.6
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787.5
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| Total |
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1,038.6
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787.5
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| Share of profit (loss) of associates |
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$ 43.8
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$ 27.4
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| Non-insurance | India | CSB Bank Limited |
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| Investments in Associates |
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| Ownership percentage |
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40.00%
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40.00%
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| Fair value |
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$ 353.6
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$ 254.8
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| Fairfax India investments in associates |
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209.2
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197.2
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| Total |
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209.2
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197.2
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| Share of profit (loss) of associates |
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$ 25.8
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$ 24.9
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| Non-insurance | India | Quess Corp Limited |
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| Investments in Associates |
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| Ownership percentage |
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34.70%
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34.60%
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| Fair value |
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$ 118.3
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$ 397.3
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| Associates and joint ventures |
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190.9
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426.4
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| Total |
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190.9
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426.4
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| Share of profit (loss) of associates |
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$ (23.4)
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$ 10.4
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| Non-insurance | India | IIFL Capital Services Limited |
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| Investments in Associates |
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| Ownership percentage |
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30.60%
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30.70%
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| Fair value |
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$ 383.5
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$ 362.7
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| Associates and joint ventures |
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17.3
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15.8
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| Fairfax India investments in associates |
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131.2
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120.4
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| Total |
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148.5
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136.2
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| Share of profit (loss) of associates |
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$ 22.4
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$ 26.1
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| Non-insurance | India | Seven Islands Shipping Limited |
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| Investments in Associates |
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| Ownership percentage |
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48.50%
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48.50%
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| Fair value |
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$ 162.4
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$ 146.0
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| Fairfax India investments in associates |
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126.6
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134.3
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| Total |
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126.6
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134.3
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| Share of profit (loss) of associates |
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$ 33.3
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$ 34.4
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| Non-insurance | India | Sanmar Chemical Enterprises Limited |
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| Investments in Associates |
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| Ownership percentage |
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39.30%
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42.90%
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| Fair value |
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$ 101.6
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$ 201.4
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| Fairfax India investments in associates |
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78.5
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81.6
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| Total |
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78.5
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81.6
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| Share of profit (loss) of associates |
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(45.2)
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(72.7)
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| Non-insurance | India | Other |
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| Investments in Associates |
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| Fair value |
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152.5
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55.9
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| Associates and joint ventures |
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202.1
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10.8
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| Fairfax India investments in associates |
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31.2
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31.3
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| Total |
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233.3
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42.1
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| Share of profit (loss) of associates |
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1.6
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1.9
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| Non-insurance | Real estate |
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| Investments in Associates |
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| Fair value |
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348.6
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272.2
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| Associates and joint ventures |
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348.6
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273.5
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| Total |
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348.6
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273.5
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| Share of profit (loss) of associates |
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9.5
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(9.7)
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| Non-insurance | Real estate | KWF Real Estate Ventures Limited Partnerships |
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| Investments in Associates |
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| Fair value |
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125.6
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106.4
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| Associates and joint ventures |
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125.6
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106.4
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| Total |
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125.6
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106.4
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| Share of profit (loss) of associates |
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(4.4)
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7.8
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| Non-insurance | Real estate | Other |
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| Investments in Associates |
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| Fair value |
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223.0
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165.8
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| Associates and joint ventures |
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223.0
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167.1
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| Total |
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223.0
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167.1
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| Share of profit (loss) of associates |
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13.9
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(17.5)
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| Non-insurance | Other |
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| Investments in Associates |
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| Fair value |
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9,346.5
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6,675.6
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| Associates and joint ventures |
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6,764.0
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5,894.0
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| Total |
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6,764.0
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5,894.0
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| Share of profit (loss) of associates |
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$ 681.4
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$ 855.9
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| Non-insurance | Other | Eurobank Ergasias Services & Holdings S.A |
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| Investments in Associates |
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| Ownership percentage |
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32.20%
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34.40%
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| Fair value |
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$ 4,703.0
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$ 2,923.5
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| Associates and joint ventures |
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2,728.2
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2,374.8
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| Total |
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2,728.2
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2,374.8
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| Share of profit (loss) of associates |
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$ 474.1
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$ 515.0
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| Non-insurance | Other | Poseidon Corp. |
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| Investments in Associates |
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| Ownership percentage |
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45.30%
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43.30%
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| Fair value |
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$ 2,640.4
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$ 2,046.3
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| Associates and joint ventures |
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2,046.4
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1,858.5
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| Total |
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2,046.4
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1,858.5
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| Share of profit (loss) of associates |
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$ 286.9
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$ 212.6
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| Non-insurance | Other | EXCO Resources Inc. |
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| Investments in Associates |
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| Ownership percentage |
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49.30%
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49.30%
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| Fair value |
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$ 591.6
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$ 459.6
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| Associates and joint ventures |
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512.6
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458.1
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| Total |
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512.6
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458.1
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| Share of profit (loss) of associates |
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$ 52.5
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$ 39.6
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| Non-insurance | Other | Waterous Energy Fund |
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| Investments in Associates |
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| Ownership percentage |
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75.60%
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77.40%
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| Fair value |
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$ 390.2
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$ 218.0
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| Associates and joint ventures |
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|
390.2
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218.0
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| Total |
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390.2
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218.0
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| Share of profit (loss) of associates |
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$ (64.7)
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$ (40.0)
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| Non-insurance | Other | Helios Fairfax Partners Corporation |
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| Investments in Associates |
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| Ownership percentage |
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36.20%
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36.30%
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| Fair value |
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$ 54.1
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$ 73.3
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| Associates and joint ventures |
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|
155.8
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162.7
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| Total |
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155.8
|
162.7
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| Share of profit (loss) of associates |
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|
(7.1)
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(34.8)
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| Non-insurance | Other | Peak Achievement Athletics, Inc. |
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| Investments in Associates |
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| Share of profit (loss) of associates |
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57.0
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| Non-insurance | Other | Stelco Holdings Inc. |
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| Investments in Associates |
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| Share of profit (loss) of associates |
|
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|
|
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|
18.3
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| Non-insurance | Other | Partnerships, trusts and other |
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| Investments in Associates |
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|
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|
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| Fair value |
|
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|
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|
967.2
|
954.9
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| Associates and joint ventures |
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|
|
|
|
930.8
|
821.9
|
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| Total |
|
|
|
|
|
930.8
|
821.9
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| Share of profit (loss) of associates |
|
|
|
|
|
$ (60.3)
|
$ 88.2
|
|