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Receivables - Schedule of Performing and Nonperforming Finance and Contract Receivables (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables $ 1,578.5 $ 1,455.6
Contract Receivables 415.4 378.7
Performing [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables 1,550.7 1,430.7
Contract Receivables 413.2 376.7
Nonperforming [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Finance Receivables 27.8 24.9
Contract Receivables $ 2.2 $ 2.0