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Receivables - Components of Finance and Contract Receivables Beyond One Year (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Finance receivables, net of unearned finance charges of $16.4 million and $13.0 million, respectively $ 1,055.8 $ 967.5
Contract receivables, net of unearned finance charges of $24.3 million and $21.5 million, respectively 313.9 289.4
Total 1,369.7 1,256.9
Allowances for doubtful accounts, finance receivables (37.2) (33.0)
Allowances for doubtful accounts, contract receivables (3.5) (2.7)
Total (40.7) (35.7)
Total long-term finance and contract receivables - net 1,329.0 1,221.2
Finance receivables - net 1,018.6 934.5
Contract receivables - net 310.4 286.7
Total long-term finance and contract receivables - net $ 1,329.0 $ 1,221.2