Income Taxes - Income Before Taxes and Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Domestic and foreign components of income before taxes:
Domestic	$ (31.1)	$ 3.8	$ (15.4)
Foreign	256.9	276.6	260.1
Income before income taxes and noncontrolling interest in consolidated subsidiaries	225.8	280.4	244.7
Current income tax (benefit) expense:
Federal	(0.5)	0.6	10.1
State	(0.5)	2.2	1.0
Foreign	85.4	82.1	61.8
Total current income tax expense	84.4	84.9	72.9
Deferred income tax (benefit) expense:
Federal	(4.9)	(2.2)	(15.4)
State	(1.0)	0.3	(0.3)
Foreign	(14.1)	(0.6)	6.5
Total deferred income tax (benefit) expense	(20.0)	(2.5)	(9.2)
Total deferred income tax (benefit) expense	(22.5)	(5.4)	(15.1)
Income tax provision	$ 64.4	$ 82.4	$ 63.7