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Receivables - Schedule of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]    
Allowance at beginning of period $ 9.6 $ 11.3
Provision for doubtful accounts, net of recoveries (3.8) (1.6)
Allowance at end of period 5.8 9.7
Finance Receivables    
Accounts Notes And Loans Receivable [Line Items]    
Allowance at beginning of period 2.7 2.2
Provision for doubtful accounts, net of recoveries (1.3) (0.2)
Allowance at end of period 1.4 2.0
Notes Receivable    
Accounts Notes And Loans Receivable [Line Items]    
Allowance at beginning of period   0.4
Allowance at end of period   0.4
Trade and Other Receivables    
Accounts Notes And Loans Receivable [Line Items]    
Allowance at beginning of period 6.9 8.7
Provision for doubtful accounts, net of recoveries (2.5) (1.4)
Allowance at end of period $ 4.4 $ 7.3