v3.25.4
Financial Risk Management - Credit Risk - Investments in debt instruments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Financial Risk Management    
Amount of bonds $ 39,988.8 $ 37,390.3
Eurolife Life Operations    
Financial Risk Management    
Amount of bonds 1,403.8  
Credit risk | Blizzard Vacatia | Largest single issuer of corporate bonds    
Financial Risk Management    
Investments in debt instruments $ 640.0  
Risk exposure percentage 0.90%  
Credit risk | BP Capital Markets America Inc | Largest single issuer of corporate bonds    
Financial Risk Management    
Investments in debt instruments   $ 444.7
Risk exposure percentage   0.70%
Credit risk | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 100.00% 100.00%
Credit risk | Investments in debt instruments | Eurolife Life Operations    
Financial Risk Management    
Amount of bonds $ 1,403.8  
Credit risk | Corporate and other bonds    
Financial Risk Management    
Risk exposure percentage 15.80% 19.80%
Credit risk | Bonds, excluding U.S., Canadian and U.K. sovereign government bonds | Ten largest issuers    
Financial Risk Management    
Investments in debt instruments $ 4,686.7 $ 4,931.0
Risk exposure percentage 6.30% 7.30%
Credit risk | AAA/Aaa | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 8.60% 50.10%
Credit risk | AAA/Aaa | Canadian government bonds    
Financial Risk Management    
Net sales of bonds $ 233.1  
Credit risk | AAA/Aaa | Other government bonds    
Financial Risk Management    
Net purchases of bonds 270.8  
Credit risk | AAA/Aaa | U.S Treasury bonds    
Financial Risk Management    
Net purchases of bonds $ 3,746.2  
Credit risk | AA/Aa | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 55.50% 6.10%
Credit risk | A/A | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 5.60% 11.20%
Credit risk | A/A | Other government bonds    
Financial Risk Management    
Net purchases of bonds $ 107.5  
Credit risk | A/A | Corporate and other bonds    
Financial Risk Management    
Net sales of bonds $ 1,835.0  
Credit risk | BBB/Baa | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 6.30% 12.50%
Credit risk | BBB/Baa | Other government bonds    
Financial Risk Management    
Net sales of bonds $ 1,076.9  
Credit risk | BBB/Baa | Corporate and other bonds    
Financial Risk Management    
Net sales of bonds $ 632.0  
Credit risk | BB/Ba | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 4.40% 3.00%
Credit risk | BB/Ba | Other government bonds    
Financial Risk Management    
Net purchases of bonds $ 727.4  
Credit risk | B/B | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 0.50% 0.40%
Credit risk | B/B | Corporate and other bonds    
Financial Risk Management    
Net sales of bonds $ 115.0  
Credit risk | Lower than B/B | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 0.90% 1.00%
Credit risk | Unrated | Orla Mining Limited    
Financial Risk Management    
Investments in debt instruments $ 369.3 $ 0.0
Credit risk | Unrated | Blizzard Vacatia    
Financial Risk Management    
Investments in debt instruments 640.0 0.0
Credit risk | Unrated | Amynta Agency Inc.    
Financial Risk Management    
Investments in debt instruments 161.2 156.2
Credit risk | Unrated | Duke Capital Limited    
Financial Risk Management    
Investments in debt instruments 135.6 114.6
Credit risk | Unrated | Mosaic Capital    
Financial Risk Management    
Investments in debt instruments 92.1 95.2
Credit risk | Unrated | Metlen Energy & Metals S.A.    
Financial Risk Management    
Investments in debt instruments $ 0.0 $ 86.8
Credit risk | Unrated | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 18.20% 15.70%
Credit risk | Unrated | Investments in first mortgage loans    
Financial Risk Management    
Investments in debt instruments $ 5,402.5 $ 4,777.8
Net purchases of bonds $ 662.6  
Credit risk | Investment grade or better | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 76.00% 79.90%
Credit risk | AA or better | Investments in debt instruments    
Financial Risk Management    
Risk exposure percentage 64.10% 56.20%
Credit risk | Amortized cost | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments $ 40,571.6 $ 38,721.1
Credit risk | Amortized cost | AAA/Aaa | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 3,477.0 19,394.3
Credit risk | Amortized cost | AA/Aa | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 22,253.5 2,333.6
Credit risk | Amortized cost | A/A | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 2,227.5 4,241.9
Credit risk | Amortized cost | BBB/Baa | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 2,520.0 4,783.6
Credit risk | Amortized cost | BB/Ba | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 1,789.6 1,316.4
Credit risk | Amortized cost | B/B | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 212.2 167.4
Credit risk | Amortized cost | Lower than B/B | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 363.3 291.4
Credit risk | Amortized cost | Unrated | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 7,728.5 6,192.5
Credit risk | Fair value | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 40,758.7 38,235.5
Credit risk | Fair value | AAA/Aaa | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 3,507.3 19,168.0
Credit risk | Fair value | AA/Aa | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 22,629.2 2,325.3
Credit risk | Fair value | A/A | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 2,301.5 4,273.3
Credit risk | Fair value | BBB/Baa | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 2,556.2 4,778.8
Credit risk | Fair value | BB/Ba | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 1,784.1 1,128.4
Credit risk | Fair value | B/B | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 221.7 171.7
Credit risk | Fair value | Lower than B/B | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments 353.1 364.6
Credit risk | Fair value | Unrated | Investments in debt instruments    
Financial Risk Management    
Investments in debt instruments $ 7,405.6 $ 6,025.4