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Receivables (Details 3)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
Party
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Party
Jun. 30, 2017
USD ($)
Finance and notes receivables        
Gross Profit $ 402.9 $ 386.9 $ 980.5 $ 847.9
Interest expense, net of interest income $ (23.5) $ (13.9) $ (45.2) $ (41.9)
Finance Receivable | Credit concentration        
Finance and notes receivables        
Receivables due from third parties (as a percent)     94.00%  
Finance Receivable, Concentration Risk, Number of Parties | Party 3   3  
Notes Receivable | Credit concentration        
Finance and notes receivables        
Receivables due from third parties (as a percent)     97.00%  
Notes Receivable, Concentration Risk, Number of Parties | Party 2   2  
Access Equipment Customer 1 [Member]        
Finance and notes receivables        
Gross Profit     $ 11.5  
Collection of a receivable previously considered uncollectable     2.4  
Interest expense, net of interest income     6.6  
Proceeds from Collection of Notes Receivable     $ 19.6