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Receivables - Schedule of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accounts Notes And Loans Receivable [Line Items]    
Allowance for doubtful accounts at beginning of year $ 9.6 $ 11.3
Provision for doubtful accounts, net of recoveries (5.5) (0.6)
Charge-off of accounts (0.5) (1.1)
Allowance for doubtful accounts at end of year 3.6 9.6
Finance Receivable    
Accounts Notes And Loans Receivable [Line Items]    
Allowance for doubtful accounts at beginning of year 2.7 2.2
Provision for doubtful accounts, net of recoveries (2.1) 0.5
Allowance for doubtful accounts at end of year 0.6 2.7
Notes Receivables    
Accounts Notes And Loans Receivable [Line Items]    
Allowance for doubtful accounts at beginning of year   0.4
Charge-off of accounts   (0.4)
Trade and Other Receivables    
Accounts Notes And Loans Receivable [Line Items]    
Allowance for doubtful accounts at beginning of year 6.9 8.7
Provision for doubtful accounts, net of recoveries (3.4) (1.1)
Charge-off of accounts (0.5) (0.7)
Allowance for doubtful accounts at end of year $ 3.0 $ 6.9