Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ (154.8)	$ (170.0)
OCI before reclassifications	(43.0)	24.3
Reclassifications to earnings	0.1	(0.8)
Ending balance	(197.7)	(146.5)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(68.3)	(86.9)
OCI before reclassifications	(48.3)	27.0
Reclassifications to earnings	0.0	0.0
Ending balance	(116.6)	(59.9)
Pension and Post-retirement Activity
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(84.8)	(86.0)
OCI before reclassifications	(0.1)	(0.4)
Reclassifications to earnings	0.5	0.3
Ending balance	(84.4)	(86.1)
Hedging Activity
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1.7)	2.9
OCI before reclassifications	5.4	(2.3)
Reclassifications to earnings	(0.4)	(1.1)
Ending balance	$ 3.3	$ (0.5)