Restructuring Charges - Activity and Reserve Balance for Restructuring Charges by Segment (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2024	Sep. 30, 2023
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 9.8	$ 15.0
Restructuring charges		9.9
Restructuring charges	4.6
Currency translation	(0.3)	0.0
Cash payments	(7.6)	(15.1)
Restructuring reserve, ending balance	6.5
Corporate
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.0	0.5
Restructuring charges		2.1
Restructuring charges	0.9
Currency translation	0.0	0.0
Cash payments	(0.9)	(2.6)
Restructuring reserve, ending balance	0.0
Americas | Reportable Segments
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.8	1.7
Restructuring charges		3.1
Restructuring charges	0.8
Currency translation	(0.1)	(0.1)
Cash payments	(1.2)	(3.9)
Restructuring reserve, ending balance	0.3
International | Reportable Segments
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	9.0	12.8
Restructuring charges		4.7
Restructuring charges	2.9
Currency translation	(0.2)	0.1
Cash payments	(5.5)	$ (8.6)
Restructuring reserve, ending balance	$ 6.2