Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Changes in Accumulated Other Comprehensive Income (Loss)
January 1	$ (1,213.8)	$ (1,197.6)
Other comprehensive income (loss) before reclassifications	(36.1)	(333.8)
Reclassification from accumulated other comprehensive income (loss)	3.7	3.1
March 31	(1,246.2)	(1,528.3)
Cash Flow Hedge
Changes in Accumulated Other Comprehensive Income (Loss)
January 1	(20.1)	(24.0)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Reclassification from accumulated other comprehensive income (loss)	1.0	0.9
March 31	(19.1)	(23.1)
Defined Benefit Pension Plans and Postemployment Arrangements
Changes in Accumulated Other Comprehensive Income (Loss)
January 1	(123.2)	(112.1)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Reclassification from accumulated other comprehensive income (loss)	2.7	2.2
March 31	(120.5)	(109.9)
Foreign Currency Translation
Changes in Accumulated Other Comprehensive Income (Loss)
January 1	(1,070.5)	(1,061.5)
Other comprehensive income (loss) before reclassifications	(36.1)	(333.8)
Reclassification from accumulated other comprehensive income (loss)	0.0	0.0
March 31	$ (1,106.6)	$ (1,395.3)