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Basis of Presentation - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Basis Of Presentation [Line Items]    
Sales type finance leases reclassified to income taxes warranty and other, increase $ 65.8  
Direct loans reclassified to trade and other receivables, decrease 18.3  
Unearned interest on finance leases   $ 387.5
ASU 2016-02    
Basis Of Presentation [Line Items]    
Cash originations from sales-type leases 132.6  
Cash receipts from sales-type leases 144.7  
ASU 2016-13    
Basis Of Presentation [Line Items]    
Increase in finance receivable allowance for credit losses 5.0  
ASU 2016-13 | Maximum    
Basis Of Presentation [Line Items]    
Estimated Increase in allowance for losses to trade receivable and available-for-sale debt securities $ 1.0