INVESTMENTS - Details of Company Investments (Details) - USD ($) $ in Millions |
Sep. 30, 2026 |
Dec. 31, 2025 |
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| Equity investments: | ||
| Equity investments | $ 303.8 | $ 414.4 |
| Equity method investments | 1,049.7 | 937.1 |
| Other | 12.6 | 29.6 |
| Total investments | 1,366.1 | 1,381.1 |
| Seed capital | ||
| Equity investments: | ||
| Equity investments | 132.0 | 286.2 |
| Investments related to deferred compensation plans | ||
| Equity investments: | ||
| Equity investments | 135.1 | 128.2 |
| Other equity securities | ||
| Equity investments: | ||
| Equity investments | $ 36.7 | $ 0.0 |
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Sum of the carrying amounts as of the balance sheet date of all investments. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of investments classified as other. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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