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Financial Instruments and Risk Management (Narrative) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026 USD ($) contracts	Mar. 31, 2025 USD ($)	Mar. 31, 2026 USD ($) contracts	Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($)
Derivative [Line Items]
Total	$ 1,250.0		$ 1,250.0		$ 1,390.0
FX contract \| Not designated as hedge
Derivative [Line Items]
Estimated fair value of derivatives	$ 0.0		$ 0.0		0.1
Open foreign currency contracts \| contracts	1		1
Derivative, notional amount	$ 9.0		$ 9.0
Gain (loss) recognized in income	0.1	$ (0.3)	0.7	$ 0.6
FX contract \| Cash flow hedge \| Designated as hedge
Derivative [Line Items]
Estimated fair value of derivatives	$ 2.6		$ 2.6		(1.4)
Open foreign currency contracts \| contracts	64		64
Derivative, notional amount	$ 132.0		$ 132.0
Revolving credit facility
Derivative [Line Items]
Total	0.0		0.0		140.0
Fixed rate
Derivative [Line Items]
Total	1,250.0		1,250.0		1,250.0
Fair value of long-term debt	$ 1,198.0		$ 1,198.0		$ 1,198.2