Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Reserves and other accrued expenses	$ 37.1	$ 29.4
Net operating loss carry forwards	436.2	395.5
Tax credit carry forwards	29.1	26.7
Interest limitation carryforwards	105.8	0.0
Differences in financial reporting and tax basis for:
Other	63.6	70.7
Valuation allowance	(245.2)	(158.8)
Realizable deferred tax assets	426.6	363.5
Deferred tax liabilities:
Reserves and other accrued expenses	(4.5)	(16.0)
Deferred costs and prepaid expenses	(45.2)	(8.2)
Differences in financial reporting and tax basis for:
Identifiable intangible assets	(382.6)	(352.0)
Property and equipment	(62.3)	(25.5)
Other	(9.6)	(2.0)
Total deferred tax liabilities	(504.2)	(403.7)
Net deferred tax liability on balance sheet	$ (77.6)	$ (40.2)