Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018
Foreign currency translation adjustment:
Balance at beginning of period	$ (697.7)	$ (706.8)	$ (716.4)
Other comprehensive (loss) income before reclassifications	(145.5)		8.4
Amount reclassified from accumulated other comprehensive loss, net of tax	(3.6)		1.2
Balance at end of period	(846.8)		(706.8)
Derivative Instrument:
Balance at beginning of period	(3.4)		(4.8)		$ (3.5)	$ (5.3)
Other comprehensive (loss) income before reclassifications, related to Derivative Instruments	(0.4)		0.0
Amount reclassified from accumulated other comprehensive loss, net of tax, related to Derivative Instruments	0.5		0.5
Defined Benefit Pension and Other Postretirement Plans
Balance at beginning of period	(228.8)	(218.1)	(219.4)
Other comprehensive (loss) income before reclassifications	(1.2)	(0.4)	0.0	$ 0.0
Amount reclassified from accumulated other comprehensive loss, net of tax	1.5		1.3
Balance at end of period	(228.5)		(218.1)
Total:
Balance at beginning of period	(930.0)	$ (929.7)	(941.1)
Other comprehensive (loss) income before reclassifications	(147.1)		8.4
Amount reclassified from accumulated other comprehensive loss, net of tax	(1.6)		3.0
Balance at end of period	$ (1,078.7)		$ (929.7)