Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning shareholders' equity	$ 1,553.1	$ 1,584.1
OCI before reclassifications	4.8	(43.0)
Reclassifications to earnings	0.5	0.1
Ending shareholders' equity	1,486.2	1,501.0
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning shareholders' equity	(41.3)	(68.3)
OCI before reclassifications	3.2	(48.3)
Reclassifications to earnings	0.0	0.0
Ending shareholders' equity	(38.1)	(116.6)
Pension and Post-retirement Activity
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning shareholders' equity	(67.6)	(84.8)
OCI before reclassifications	0.1	(0.1)
Reclassifications to earnings	0.5	0.5
Ending shareholders' equity	(67.0)	(84.4)
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning shareholders' equity	(109.8)	(154.8)
Ending shareholders' equity	(104.5)	(197.7)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning shareholders' equity	(0.9)	(1.7)
OCI before reclassifications	1.5	5.4
Reclassifications to earnings	0.0	(0.4)
Ending shareholders' equity	$ 0.6	$ 3.3