Supplemental Information (Debt Repayment) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Oct. 31, 2025
Debt Instrument [Line Items]
Payments on long-term debt	$ 569.6	$ 12.1
Senior Note One Point Five Percent | Senior Notes
Debt Instrument [Line Items]
Payments on long-term debt	$ 550.0
Interest rate			1.50%