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INCOME TAXES - Net Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets    
Accrued, deferred, and long-term incentive compensation $ 317.7 $ 303.5
Property, equipment and software 90.9 30.6
Acquired investments 66.4 40.3
Net operating loss carry-forwards 53.7 42.5
Operating lease liability 39.8 44.8
Other 12.9 16.0
Total deferred tax assets 581.4 477.7
Valuation allowance (118.9) (102.8)
Total deferred tax assets, net of valuation allowance 462.5 374.9
Deferred tax liabilities    
Contingent consideration liability (50.9) (47.8)
Unrealized gains (losses) recognized in non-operating income (50.0) (33.2)
Operating lease assets (41.1) (42.8)
Acquisition-related retention liability (26.6) (39.5)
Other (15.9) (17.8)
Total deferred tax liabilities (184.5) (181.1)
Net deferred tax assets $ 278.0 $ 193.8