Income Taxes - Income and Taxes from Cont. Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income (loss) from continuing operations before income taxes
U.S.	$ (32.9)	$ (41.6)	$ (28.3)
Foreign	75.4	223.1	153.3
Income from continuing operations before tax	42.5	181.5	125.0
Current tax expense (benefit)
U.S. federal	(2.3)	(33.7)	(3.3)
State	0.7	0.4	0.5
Foreign	92.1	96.8	84.2
Current tax expense	90.5	63.5	81.4
Deferred tax expense (benefit)
U.S. federal	(7.5)	106.2	0.6
State	(2.9)	(4.9)	(0.1)
Foreign	(10.1)	(7.1)	(3.4)
Deferred tax expense (benefit)	(20.5)	94.2	(2.9)
Provision for income taxes of continuing operations	70.0	157.7	78.5
Comprehensive provision (benefit) for income taxes allocable to
Continuing operations	70.0	157.7	78.5
Discontinued operations	0.0	(0.1)	(1.1)
Other comprehensive income (loss)	5.0	(1.8)	0.9
Equity	0.0	0.0	(0.2)
Comprehensive provision for income taxes	$ 75.0	$ 155.8	$ 78.1