Income Taxes - Income and Taxes from Cont. Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income (loss) from continuing operations before income taxes
U.S.	$ (90.2)	$ (32.9)	$ (41.6)
Foreign	183.7	75.4	223.1
Income from continuing operations before tax	93.5	42.5	181.5
Current tax expense (benefit)
U.S. federal	(0.8)	(2.3)	(33.7)
State	4.3	0.7	0.4
Foreign	90.8	92.1	96.8
Current tax expense	94.3	90.5	63.5
Deferred tax expense (benefit)
U.S. federal	(30.4)	(7.5)	106.2
State	(4.8)	(2.9)	(4.9)
Foreign	1.9	(10.1)	(7.1)
Deferred tax expense (benefit)	(33.3)	(20.5)	94.2
Provision for income taxes of continuing operations	61.0	70.0	157.7
Comprehensive provision (benefit) for income taxes allocable to
Continuing operations	61.0	70.0	157.7
Discontinued operations	0.2	0.0	(0.1)
Other comprehensive income (loss)	0.4	5.0	(1.8)
Comprehensive provision for income taxes	$ 61.6	$ 75.0	$ 155.8