Income Taxes - Deferred Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets related to:
Reserves, accrued expenses and employee-related items	$ 44.8	$ 279.8
Tax attribute carryovers	27.1	39.1
Pension obligations	4.6	11.1
Intangibles, property and equipment	11.9	9.7
Other	10.7	14.8
Valuation allowance	(19.9)	(22.0)
Total deferred tax assets	79.2	332.5
Deferred tax liabilities related to:
Intangibles, property and equipment	239.4	394.4
Other	0.9	14.3
Total deferred tax liabilities	240.3	408.7
Net deferred tax liability	161.1	76.2
Other Assets
Deferred tax liabilities related to:
Gross deferred tax assets	$ 11.9	$ 9.7