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Receivables - Components of Current Finance and Contract Receivables (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Finance receivables, net of unearned finance charges of $20.7 million and $17.0 million, respectively $ 522.8 $ 488.1
Contract receivables, net of unearned finance charges of $17.0 million and $15.6 million, respectively 101.4 89.3
Total 624.2 577.4
Allowances for doubtful accounts, finance receivables (17.0) (15.6)
Allowances for doubtful accounts, contract receivables (1.6) (1.2)
Total (18.6) (16.8)
Total current finance and contract receivables - net 605.6 560.6
Finance receivables - net 505.8 472.5
Contract receivables - net 99.8 88.1
Total current finance and contract receivables - net $ 605.6 $ 560.6