Stockholders' Equity (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Changes to accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ (366.0)
Balance at the end of the period	(388.0)
Foreign Currency Translation Adjustment
Changes to accumulated other comprehensive income (loss)
Balance at the beginning of the period	(188.0)	$ (250.0)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0.0	0.0
Effect of exchange rate changes and deferred taxes	(30.0)	(8.0)
Balance at the end of the period	(218.0)	(258.0)
Other Comprehensive Income Pension and Other Postretirement Benefit Plans Arising During Period Before Tax	0.0	0.0
Unrealized Gain on Derivatives
Changes to accumulated other comprehensive income (loss)
Balance at the beginning of the period	5.0	5.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	0.0	0.0
Effect of exchange rate changes and deferred taxes	0.0	0.0
Balance at the end of the period	5.0	5.0
Other Comprehensive Income Pension and Other Postretirement Benefit Plans Arising During Period Before Tax	0.0	0.0
Defined Benefit Plans
Changes to accumulated other comprehensive income (loss)
Balance at the beginning of the period	(183.0)	(126.0)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	5.0	(1.0)
Effect of exchange rate changes and deferred taxes	2.0	1.0
Balance at the end of the period	(175.0)	(121.0)
Other Comprehensive Income Pension and Other Postretirement Benefit Plans Arising During Period Before Tax	(1.0)	(5.0)
Accumulated Other Comprehensive Loss
Changes to accumulated other comprehensive income (loss)
Balance at the beginning of the period		(371.0)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(5.0)	1.0
Effect of exchange rate changes and deferred taxes	(28.0)	(7.0)
Balance at the end of the period	(388.0)	(374.0)
Other Comprehensive Income Pension and Other Postretirement Benefit Plans Arising During Period Before Tax	$ (1.0)	$ (5.0)