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Receivables - Components of Finance and Contract Receivables Beyond One Year (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Receivables [Abstract]    
Unearned finance charges, finance receivables $ 16.4 $ 13.0
Unearned finance charges, contract receivable $ 24.3 $ 21.5