Restructuring Charges - Activity and Reserve Balance for Restructuring Charges by Segment (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 6.2	$ 4.5
Restructuring charges	18.5	13.8
Currency translation and other adjustments	(0.3)	(0.7)
Cash payments	(5.1)	(11.4)
Restructuring reserve, ending balance	19.3	6.2
Americas
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.3	0.5
Restructuring charges	3.7	0.5
Currency translation and other adjustments	(0.1)	(0.1)
Cash payments	(0.3)	(0.6)
Restructuring reserve, ending balance	3.6	0.3
International
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	5.9	4.0
Restructuring charges	13.7	12.7
Currency translation and other adjustments	(0.2)	(0.6)
Cash payments	(4.5)	(10.2)
Restructuring reserve, ending balance	14.9	5.9
Corporate
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.0	0.0
Restructuring charges	1.1	0.6
Currency translation and other adjustments	0.0	0.0
Cash payments	(0.3)	(0.6)
Restructuring reserve, ending balance	$ 0.8	$ 0.0