Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (3.9)	$ (0.5)
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(247.6)	(228.5)	$ (249.4)	$ (228.8)
Foreign currency translation adjustment:
Balance at beginning of period	(637.6)	(697.7)
Other comprehensive (loss) income before reclassifications	(40.9)	(145.5)
Amount reclassified from accumulated other comprehensive loss, net of tax	0.7	(3.6)
Balance at end of period	(677.8)	(846.8)
Derivative Instrument:
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	18.4	(0.4)
Defined Benefit Pension and Other Postretirement Plans
Balance at beginning of period	6.8	(3.5)
Other comprehensive (loss) income before reclassifications	0.0	(1.2)
Amount reclassified from accumulated other comprehensive loss, net of tax	1.8	1.5
Balance at end of period	29.1	(3.4)
Total:
Balance at beginning of period	(880.2)	(930.0)
Other comprehensive (loss) income before reclassifications	(22.5)	(147.1)
Amount reclassified from accumulated other comprehensive loss, net of tax	6.4	(1.6)
Balance at end of period	$ (896.3)	$ (1,078.7)