Summary of Impaired Loans and Specific Reserve (Cash Basis Method) (Detail) (Financial Services, USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Interest income recognized:
Interest income recognized on a cash basis	$ 0.4	$ 1.2	$ 0.9	$ 1.8
Dealer | Wholesale
Interest income recognized:
Interest income recognized on a cash basis		0.1	0.1	0.1
Customer Retail | Fleet
Interest income recognized:
Interest income recognized on a cash basis	0.3	0.9	0.6	1.3
Customer Retail | Owner/Operator
Interest income recognized:
Interest income recognized on a cash basis	$ 0.1	$ 0.2	$ 0.2	$ 0.4