Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2025	Dec. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income		$ (15.2)	$ (10.4)
Net derivative (losses) gains and other costs arising during the period, net of tax (benefit) expense of $0.0 and $3.5, respectively	[1]	(0.1)	9.4
Reclassification of (gains) into net income, net of tax (expense) of $(0.2) and $(0.4), respectively		(0.5)	(1.2)
Other comprehensive (loss) income		(0.6)	8.2
Comprehensive (loss)		$ (15.8)	$ (2.2)

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