(Income) or Expense Recognized in Earnings Related to Fair Value Hedges (Detail) (Financial Services, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Financial Services
Derivative [Line Items]
Interest and other borrowing expenses - interest-rate swaps	$ 0.2	$ (2.4)	$ 0.5	$ (4.0)
Interest and other borrowing expenses - term notes	$ (0.2)	$ 3.2	$ (0.6)	$ 4.7