Consolidated Statements of Comprehensive (Loss) (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net Income (Loss)		$ (10.4)	$ (16.4)
Net derivative gains (losses) and other costs arising during the period, net of tax (benefit) expense of $3.5 and $(3.8), respectively (1)	[1]	9.4	(10.6)
Reclassification of (gains) into net (loss), net of tax (expense) of $(0.4) and $(0.6), respectively		(1.2)	(2.3)
Other comprehensive income (loss)		8.2	(12.9)
Comprehensive (loss)		$ (2.2)	$ (29.3)

[1] Other costs include the effects of foreign currency translation adjustments which were immaterial during the periods presented.