Derivative Financial Instruments (Gain) Loss recognized in Statement of Operations from derivative instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Derivative Instruments, (Gain) Loss
(Gain) Loss Recognized in Statement of Operations	$ 18.1	$ 2.1	$ 5.8
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of goods sold	Cost of goods sold	Cost of goods sold