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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets    
Deferred compensation $ 18.0 $ 10.4
State net operating loss carryforwards 18.2 16.8
Foreign loss carryforwards 16.7 16.3
Tax benefit of uncertain tax positions 10.9 11.4
Deferred income 8.8 0.0
Accrued expenses 3.6 1.3
Other 1.5 0.0
Total deferred tax assets 77.7 56.2
Valuation allowance (24.1) (24.1)
Deferred tax assets, net of valuation allowance 53.6 32.1
Deferred Tax Liabilities    
Intangible asset amortization (337.1) (258.6)
Convertible securities interest (84.5) (77.9)
Non-deductible intangible amortization (141.0) (150.8)
Deferred income 0.0 (5.9)
Other (2.6) (6.3)
Total deferred tax liabilities (565.2) (499.5)
Deferred income tax liability (net) $ (511.6) $ (467.4)