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Supplemental Financial Information - Summary of Accounts Receivable (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Sep. 30, 2023
Current    
Trade $ 85.4 $ 64.0
Notes receivable from franchisees 3.7 1.6
Other 8.9 16.3
Receivables, gross 98.0 81.9
Allowance for credit losses (0.5) (0.6)
Receivables, net 97.5 81.3
Non-current    
Notes receivable 2.4 2.3
Other 7.1 7.5
Noncurrent notes receivable, gross 9.5 9.8
Allowance for losses (2.5) (2.4)
Noncurrent notes receivable, net $ 7.0 $ 7.4