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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred Tax Assets    
Deferred compensation $ 15.4 $ 13.8
State loss carryforwards 17.0 15.9
Foreign loss carryforwards 19.7 17.7
Tax benefit of uncertain tax positions 26.3 27.4
Deferred income 0.0 3.0
Lease liabilities 10.0 12.3
Foreign tax credits 8.2 0.0
Other 0.0 2.6
Total deferred tax assets 96.6 92.7
Valuation allowance (35.6) (16.9)
Deferred tax assets, net of valuation allowance 61.0 75.8
Deferred Tax Liabilities    
Intangible asset amortization (235.6) (293.7)
Non-deductible intangible amortization (116.6) (110.9)
Junior convertible securities interest (99.3) (91.6)
Right-of-use assets (7.3) (10.3)
Deferred income (10.7) 0.0
Other (8.5) (4.1)
Total deferred tax liabilities (478.0) (510.6)
Deferred income tax liability (net) (417.0) (434.8)
Other Assets    
Deferred Tax Assets    
Foreign loss carryforwards 19.7 17.7
Deferred Tax Liabilities    
Carryforwards valuation allowance $ 13.3 $ 2.3