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INCOME TAXES - Deferred Income Taxes (Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
Property, equipment and software | $ (60.3) | $ (43.2) | $ (64.1)
Accrued, deferred, and long-term incentive compensation | (14.2) | (28.6) | 11.8
Operating lease assets | (1.7) | (6.3) | 24.8
Operating lease liabilities | 5.0 | 3.8 | (24.3)
Acquisition-related retention liability | (12.9) | (14.8) | (13.6)
Contingent consideration liability | 3.1 | 15.4 | 32.4
Acquired investments | (27.9) | (19.5) | (73.0)
Unrealized gains (losses) recognized in non-operating income | 16.8 | 43.8 | (114.6)
Net operating losses | (11.2) | (31.5) | (11.0)
Change in valuation allowance | 16.1 | 86.4 | 16.4
Other | (0.8) | 3.1 | 8.2
Total net deferred income taxes (benefits) | $ (88.0) | $ 8.6 | $ (207.0)

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