Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Pretax income of non-United States operations	$ 551.0	$ 514.9	$ 482.2
Unremitted earnings of non-United States subsidiaries that are considered to be permanently invested	292.5
Unremitted earnings of non-United States subsidiaries that may be remitted	1,729.3
Deferred tax liability, undistributed foreign earnings	15.3	5.5
Deferred tax asset on net operating losses	100.5	104.1
Valuation allowance, net operating losses	66.3
Gross unrecognized tax benefits	34.2	66.5	44.0
Reduction to unrecognized tax benefits	42.4
Interest and penalties related to unrecognized tax benefits	$ (18.4)	$ 0.2	$ 0.3