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INCOME TAXES - Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax assets |  |
Stock-based compensation | $ 94.5 | $ 96.4
Property and equipment | 30.6 | 0.0
Operating lease liabilities | 44.8 | 48.6
Accrued compensation | 13.7 | 9.6
Acquired investments | 40.3 | 20.8
Supplemental savings plan | 195.3 | 168.9
Net operating loss carry-forwards | 42.5 | 11.0
Net unrealized holding losses recognized in income | 0.0 | 10.6
Currency translation adjustment | 6.6 | 8.5
Other | 9.4 | 17.3
Total deferred tax assets | 477.7 | 391.7
Valuation allowance | (102.8) | (16.4)
Deferred Tax Assets, Net of Valuation Allowance, Total | 374.9 | 375.3
Deferred tax liabilities |  |
Acquisition-related retention liability | (39.5) | (54.3)
Contingent consideration liability | (47.8) | (32.4)
Property and equipment | 0.0 | (12.6)
Operating lease assets | (42.8) | (49.1)
Net unrealized holding gains recognized in income | (33.2) | 0.0
Other | (17.8) | (10.8)
Total deferred tax liabilities | (181.1) | (159.2)
Net deferred tax assets | $ 193.8 | $ 216.1

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