Restructuring Charges - Activity and Reserve Balance for Restructuring Charges by Segment (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 6.2	$ 4.5
Restructuring charges	2.0	13.8
Currency translation and other adjustments	(0.1)	(0.7)
Cash payments / utilization	(1.9)	(11.4)
Restructuring reserve, ending balance	6.2	6.2
Americas
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.3	0.5
Restructuring charges	0.1	0.5
Currency translation and other adjustments	0.0	(0.1)
Cash payments / utilization	(0.1)	(0.6)
Restructuring reserve, ending balance	0.3	0.3
International
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	5.9	4.0
Restructuring charges	1.9	12.7
Currency translation and other adjustments	(0.1)	(0.6)
Cash payments / utilization	(1.8)	(10.2)
Restructuring reserve, ending balance	5.9	5.9
Corporate
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.0	0.0
Restructuring charges	0.0	0.6
Currency translation and other adjustments	0.0	0.0
Cash payments / utilization	0.0	(0.6)
Restructuring reserve, ending balance	$ 0.0	$ 0.0