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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred Tax Assets    
Deferred compensation $ 12.5 $ 15.4
State loss carryforwards 16.9 17.0
Foreign loss carryforwards 22.2 19.7
Tax benefit of uncertain tax positions 17.4 26.3
Lease liabilities 7.6 10.0
Foreign tax credits 8.7 8.2
Other 1.3 0.0
Total deferred tax assets 86.6 96.6
Valuation allowance (43.9) (35.6)
Deferred tax assets, net of valuation allowance 42.7 61.0
Deferred Tax Liabilities    
Intangible asset amortization (255.9) (235.6)
Non-deductible intangible amortization (149.2) (116.6)
Junior convertible securities interest (101.7) (99.3)
Right-of-use assets (5.9) (7.3)
Deferred income (27.3) (10.7)
Other (4.0) (8.5)
Total deferred tax liabilities (544.0) (478.0)
Deferred income tax liability (net) (501.3) (417.0)
Other Assets    
Deferred Tax Assets    
Foreign loss carryforwards 22.2 19.7
Deferred Tax Liabilities    
Carryforwards valuation allowance $ 20.3 $ 13.3