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FAIR VALUE OF ASSETS AND LIABILITIES - Tri-Level Hierarchy, Carrying Value (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Equity investments: |  |
Total | $ 859.7 | $ 850.5
Liabilities: |  |
Total |  | (10.7)
Equity method investments | 805.8 | 854.5
Other investments | 29.5 | 14.3
Total return swap related to deferred compensation plans |  |
Equity investments: |  |
Total return swap related to deferred compensation plans | 26.6 |
Liabilities: |  |
Total return swap related to deferred compensation plans |  | (9.4)
Contingent consideration liability |  |
Liabilities: |  |
Contingent consideration liability |  | (1.3)
Money market funds |  |
Cash equivalents: |  |
Money market funds | 504.2 | 479.3
Seed capital |  |
Equity investments: |  |
Equity investments | 203.4 | 151.6
Investments related to deferred compensation plans |  |
Equity investments: |  |
Equity investments | 125.5 | 219.6
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Equity investments: |  |
Total | 833.1 | 850.5
Liabilities: |  |
Total |  | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Total return swap related to deferred compensation plans |  |
Equity investments: |  |
Total return swap related to deferred compensation plans | 0.0 |
Liabilities: |  |
Total return swap related to deferred compensation plans |  | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Contingent consideration liability |  |
Liabilities: |  |
Contingent consideration liability |  | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Cash equivalents: |  |
Money market funds | 504.2 | 479.3
Quoted Prices in Active Markets for Identical Assets (Level 1) | Seed capital |  |
Equity investments: |  |
Equity investments | 203.4 | 151.6
Quoted Prices in Active Markets for Identical Assets (Level 1) | Investments related to deferred compensation plans |  |
Equity investments: |  |
Equity investments | 125.5 | 219.6
Significant Other Observable Inputs (Level 2) |  |
Equity investments: |  |
Total | 26.6 | 0.0
Liabilities: |  |
Total |  | (9.4)
Significant Other Observable Inputs (Level 2) | Total return swap related to deferred compensation plans |  |
Equity investments: |  |
Total return swap related to deferred compensation plans | 26.6 |
Liabilities: |  |
Total return swap related to deferred compensation plans |  | (9.4)
Significant Other Observable Inputs (Level 2) | Contingent consideration liability |  |
Liabilities: |  |
Contingent consideration liability |  | 0.0
Significant Other Observable Inputs (Level 2) | Money market funds |  |
Cash equivalents: |  |
Money market funds | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) | Seed capital |  |
Equity investments: |  |
Equity investments | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) | Investments related to deferred compensation plans |  |
Equity investments: |  |
Equity investments | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) |  |
Equity investments: |  |
Total | 0.0 | 0.0
Liabilities: |  |
Total |  | (1.3)
Significant Unobservable Inputs (Level 3) | Total return swap related to deferred compensation plans |  |
Equity investments: |  |
Total return swap related to deferred compensation plans | 0.0 |
Liabilities: |  |
Total return swap related to deferred compensation plans |  | 0.0
Significant Unobservable Inputs (Level 3) | Contingent consideration liability |  |
Liabilities: |  |
Contingent consideration liability |  | (1.3)
Significant Unobservable Inputs (Level 3) | Money market funds |  |
Cash equivalents: |  |
Money market funds | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Seed capital |  |
Equity investments: |  |
Equity investments | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Investments related to deferred compensation plans |  |
Equity investments: |  |
Equity investments | $ 0.0 | $ 0.0

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