Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Deferred benefit on intercompany sales	$ 16.0	$ 9.1	$ 15.5
Provisional tax expense	26.0
Transition tax expense	43.4
Change in tax rate benefit	17.4
Foreign earnings repatriated	603.2
Unrecognized tax benefits including accrued interest and penalties	90.7	77.1	72.3
Unrecognized tax benefits, income tax penalties and interest accrued	10.7	13.7	10.0
Income tax interest and penalties expense	2.3	$ 3.9	$ 2.2
Unrecognized tax benefits that, if recognized, would impact the effective income tax rate	76.0
Unrecognized tax benefits that may be recognized	$ 3.3