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Supplemental Financial Statement Information (Supplemental Statement of Income Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financial Statement Related Disclosures [Line Items]
Interest income	$ (1.2)	$ (5.6)
Foreign currency exchange gain (loss)	(3.8)	23.7
Pension cost other than service costs	0.0	1.0
Transition services agreement income	0.0	(1.0)
Other	0.0	0.9
Total Other items, net	(5.0)	19.0
Nonoperating Income (Expense)
Financial Statement Related Disclosures [Line Items]
Foreign currency exchange gain (loss)	0.0	21.0
ARGENTINA
Financial Statement Related Disclosures [Line Items]
Foreign currency exchange gain (loss)	21.0	$ (21.0)
ARGENTINA | Nonoperating Income (Expense)
Financial Statement Related Disclosures [Line Items]
Foreign currency exchange gain (loss)	$ 21.0

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