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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