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INCOME TAXES - Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets |  |
Stock-based compensation | $ 87.4 | $ 79.3
Asset impairments | 5.4 | 7.4
Operating lease liabilities | 24.3 | 34.9
Accrued compensation | 9.1 | 7.5
Supplemental savings plan | 190.2 | 160.9
Currency translation adjustment | 2.0 | 0.2
Other | 24.6 | 13.5
Total deferred tax assets | 343.0 | 303.7
Deferred tax liabilities |  |
Acquisition-related retention liability | (68.4) | 0.0
Acquired Investments | (59.2) | 0.0
Property and equipment | (76.7) | (64.9)
Operating lease assets | (24.3) | (34.9)
Net unrealized holding gains recognized in income | (104.8) | (130.9)
Other | (16.6) | (12.4)
Total deferred tax liabilities | (350.0) | (243.1)
Net deferred tax liabilities | $ (7.0) |
Net deferred tax assets |  | $ 60.6

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