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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative [Line Items]        
Interest-rate swaps $ (0.7) $ (3.0) $ 0.6 $ (5.0)
Term notes $ 0.9 $ 2.8 $ (0.4) $ 4.4