Derivative Financial Instruments (Tables)

12 Months Ended

Sep. 30, 2022

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative instruments in consolidated balance sheets

	September 30, 2021
Other current liabilities	$	4.7
Other liabilities	1.1
Total liabilities	$	5.8

Derivative instruments, loss (gain)

		Year Ended September 30,
Hedging Activity	Statement of Operations Location	2022		2021		2020
Mark-to-market adjustments	Interest expense, net	$	(2.3)	$	0.2	$	1.6
Net loss amortized from accumulated OCI	Interest expense, net	1.0		2.3		1.2
Net loss amortized from accumulated OCI	Loss on extinguishment and refinancing of debt, net	6.1		—		—
Tax benefit reclassified from accumulated OCI	Income tax expense	(0.4)		(0.2)		(0.2)
Total net hedging loss, net of tax		$	4.4	$	2.3	$	2.6
Cash settlements paid		$	(2.0)	$	(4.8)	(1.8)