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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets    
State net operating loss carryforwards $ 16.8 $ 17.4
Foreign loss carryforwards 16.3 14.6
Tax benefit of uncertain tax positions 11.4 12.1
Deferred compensation 10.4 34.1
Foreign tax credits 0.0 10.0
Accrued expenses 1.3 3.9
Total deferred tax assets 56.2 92.1
Valuation allowance (24.1) (22.1)
Deferred tax assets, net of valuation allowance 32.1 70.0
Deferred Tax Liabilities    
Intangible asset amortization (258.6) (396.8)
Non-deductible intangible amortization (150.8) (177.0)
Convertible securities interest (77.9) (109.0)
Deferred income (5.9) (47.2)
Other (6.3) (0.8)
Total deferred tax liabilities (499.5) (730.8)
Deferred income tax liability (net) $ (467.4) $ (660.8)