Consolidated Statements of Comprehensive (Loss) (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net (loss)		$ (16.4)	$ (18.9)
Net derivative losses and other costs arising during the period, net of tax (benefit) of $(3.8) and $0.0	[1]	(10.6)	0.0
Reclassification of (gains) into net (loss), net of tax (expense) of $(0.6) and $(0.6), respectively		(2.3)	(2.4)
Other comprehensive (loss)		(12.9)	(2.4)
Comprehensive (loss)		$ (29.3)	$ (21.3)

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