Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Changes to accumulated other comprehensive income (loss)
Balance at the beginning of the period	$ (366.0)
Balance at the end of the period	(440.0)
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
Effect of exchange rate changes and deferred taxes	(83.0)	32.0
Balance at the end of the period	(271.0)	(218.0)
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
Effect of exchange rate changes and deferred taxes	0.0	0.0
Balance at the end of the period	5.0	5.0
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	1.0
Effect of exchange rate changes and deferred taxes	8.0	(2.0)
Balance at the end of the period	(174.0)	(128.0)
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	(1.0)
Effect of exchange rate changes and deferred taxes	(75.0)	30.0
Balance at the end of the period	$ (440.0)	$ (341.0)