Income Taxes - Income Before Taxes and Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Domestic and foreign components of income before taxes:
Domestic	$ (15.4)	$ (14.0)	$ 18.4
Foreign	260.1	211.8	159.2
Income before income taxes and noncontrolling interest in consolidated subsidiaries	244.7	197.8	177.6
Current income tax (benefit) expense:
Federal	10.1	32.2	(2.4)
State	1.0	2.0	0.3
Foreign	61.8	42.7	59.8
Total current income tax expense	72.9	76.9	57.7
Deferred income tax (benefit) expense:
Federal	(15.4)	35.5	3.1
State	(0.3)	(0.4)	(5.3)
Foreign	6.5	5.5	(32.4)
Total deferred income tax (benefit) expense	(9.2)	40.6	(34.6)
Income tax provision	$ 63.7	$ 117.5	$ 23.1