Business Combinations - Schedule of Aggregate Cash Consideration and Total Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Inventories	$ 0.3	$ 0.0
Property, plant and equipment (a)	2.0	2.3
Operating lease assets	2.1	4.3
Goodwill (b)	6.1	11.2
Intangible assets (c)
Other current liabilities	(0.2)	(0.2)
Operating lease liabilities	(2.0)	(4.1)
Other noncurrent liabilities	(1.1)	0.0
Total net assets acquired	9.6	$ 13.6
Finance lease assets	$ 1.1
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other noncurrent liabilities	Other noncurrent liabilities
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, plant and equipment, net	Property, plant and equipment, net
Finance lease liability	$ 1.1
Weighted average amortization period	9 years	5 years
Reacquired franchise rights (d)
Business Acquisition [Line Items]
Intangible assets (c)	$ 2.3	$ 0.0
Weighted average amortization period	10 years
Gain (Loss) on Contract Termination	$ 0.0
Other
Business Acquisition [Line Items]
Intangible assets (c)	$ 0.1	$ 0.1