Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net (loss)	$ (12.8)	$ (12.0)
Net derivative gains arising during the period, net of tax of $(0.3) and $0.0, respectively	1.0
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Reclassification Adjustment from AOCI for Derecognition, after Tax	0.5	3.6
Other comprehensive (loss) income	0.5	3.6
Comprehensive (loss) income	$ (12.3)	$ (8.4)