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INCOME TAXES - Net Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets    
Stock-based compensation $ 96.1 $ 87.4
Asset impairments 0.0 5.4
Operating lease liabilities 48.5 24.3
Accrued compensation 9.6 9.1
Acquired investments 20.8 0.0
Supplemental savings plan 168.9 190.2
Net unrealized holding losses recognized in income 10.6 0.0
Currency translation adjustment 8.5 2.0
Other 14.3 24.6
Total deferred tax assets 377.3 343.0
Deferred tax liabilities    
Acquisition-related retention liability (54.3) (68.4)
Contingent consideration liability (32.4) 0.0
Acquired Investments 0.0 (59.2)
Property and equipment (12.7) (76.7)
Operating lease assets (49.0) (24.3)
Net unrealized holding gains recognized in income 0.0 (104.8)
Other (12.8) (16.6)
Total deferred tax liabilities (161.2) (350.0)
Net deferred tax assets $ 216.1  
Net deferred tax liabilities   $ (7.0)