Restructuring Charges - Activity and Reserve Balance for Restructuring Charges by Segment (Details) - USD ($) $ in Millions	6 Months Ended	9 Months Ended
	Jun. 30, 2025	Sep. 30, 2024
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 3.4	$ 9.8
Restructuring charges		6.4
Restructuring charges	2.4
Currency translation	0.4	(0.4)
Cash payments	(2.6)	(12.4)
Restructuring reserve, ending balance	3.6
Corporate
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.0	0.0
Restructuring charges		1.3
Restructuring charges	0.9
Currency translation	0.0	0.0
Cash payments	(0.9)	(1.3)
Restructuring reserve, ending balance	0.0
Americas | Reportable Segments
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.2	0.8
Restructuring charges		1.6
Restructuring charges	0.5
Currency translation	0.0	(0.1)
Cash payments	(0.1)	(2.1)
Restructuring reserve, ending balance	0.6
International | Reportable Segments
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	3.2	9.0
Restructuring charges		3.5
Restructuring charges	1.0
Currency translation	0.4	(0.3)
Cash payments	(1.6)	$ (9.0)
Restructuring reserve, ending balance	$ 3.0