Accumulated Other Comprehensive Loss (Schedule of Reclassifications out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassifications to earnings	$ (0.1)	$ 0.8
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
OCI Cash flow hedge, reclassification to earnings, tax	0.1	0.5
Other comprehensive income, reclassification to earnings, cash flow hedges, after tax	0.4	1.1
Amortization of defined benefit pension and postretirement items, actuarial losses, before tax	(0.6)	(0.4)
Amortization of defined benefit pension and postretirement items, tax	(0.1)	(0.1)
Amortization of defined benefit pension and postretirement items, after tax	(0.5)	(0.3)
Reclassifications to earnings	$ (0.1)	$ 0.8