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(Income) or Expense Recognized in Earnings Related to Fair Value Hedges (Detail) - Financial Services - Interest and other borrowing expenses - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative [Line Items]        
Interest-rate swaps $ 0.4 $ 3.7 $ 1.0 $ (1.3)
Term notes $ (0.2) $ (3.8) $ (0.6) $ 0.6