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Receivables - Schedule of Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]    
Allowance at beginning of period $ 11.3 $ 9.9
Provision for doubtful accounts, net of recoveries (1.6) 0.6
Allowance at end of period 9.7 10.5
Finance Receivable    
Accounts Notes And Loans Receivable [Line Items]    
Allowance at beginning of period 2.2 2.8
Provision for doubtful accounts, net of recoveries (0.2) (0.1)
Allowance at end of period 2.0 2.7
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 Receivable    
Accounts Notes And Loans Receivable [Line Items]    
Allowance at beginning of period 8.7 7.1
Provision for doubtful accounts, net of recoveries (1.4) 0.7
Allowance at end of period $ 7.3 $ 7.8