Allowance for Credit Losses (Detail) (Financial Services, USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 130.0		$ 139.0
Provision for losses	15.4		15.2
Charge-offs	(18.0)		(21.9)
Recoveries	5.2		5.0
Currency translation and other	(0.9)		1.8
Ending Balance	131.7		139.1
Dealer wholesale financing
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	11.8		11.7
Provision for losses	(0.7)		2.3
Charge-offs	(0.2)
Recoveries			0.1
Currency translation and other			(1.7)
Ending Balance	10.9		12.4
Retail | Dealer
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	13.4		11.9
Provision for losses	(0.7)		1.2
Currency translation and other	(0.1)		0.1
Ending Balance	12.6		13.2
Retail | Customer
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	99.2		106.6
Provision for losses	11.2		9.3
Charge-offs	(11.1)		(17.1)
Recoveries	4.2		4.6
Currency translation and other	(4.0)		4.0
Ending Balance	99.5		107.4
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	5.6	[1]	8.8	[1]
Provision for losses	5.6	[1]	2.4	[1]
Charge-offs	(6.7)	[1]	(4.8)	[1]
Recoveries	1.0	[1]	0.3	[1]
Currency translation and other	3.2	[1]	(0.6)	[1]
Ending Balance	$ 8.7	[1]	$ 6.1	[1]

[1] Operating lease and other trade receivables.