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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Derivative [Line Items]        
Interest-rate swaps $ (4.2) $ 0.6 $ (5.3) $ 0.1
Term notes $ 4.0 $ (1.0) $ 4.6 $ (2.2)