Financial Instruments (Effects of Derivatives Not Designated as a Hedging Instrument) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Other Income (Expense), Net
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	$ 0.5	$ (3.9)
Other Income (Expense), Net | Forward exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	0.5	(3.9)
Other Income (Expense), Net | De-designated interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	0.0	0.0
Other Income (Expense), Net | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	0.0	0.0
Other non‑operating income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	(1.8)	(42.4)
Other non‑operating income (expense), net | Forward exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	(0.4)	(1.9)
Other non‑operating income (expense), net | De-designated interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	(1.9)	(38.8)
Other non‑operating income (expense), net | Other
Derivative Instruments, Gain (Loss) [Line Items]
Total (Gain) Loss Recognized in Income	$ 0.5	$ (1.7)