Allowance for Credit Losses (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for losses	$ 15.4		$ 12.9		$ 20.0
Financial Services
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	129.3		130.0		139.0
Provision for losses	15.4		12.9		20.0
Charge-offs	(21.3)		(24.5)		(38.7)
Recoveries	5.3		10.9		7.4
Currency translation and other	(6.7)				2.3
Ending Balance	122.0		129.3		130.0
Financial Services | Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	10.4		11.8		11.7
Provision for losses	0.3		(0.9)		1.8
Charge-offs	(0.9)		(0.5)
Currency translation and other	(0.8)				(1.7)
Ending Balance	9.0		10.4		11.8
Financial Services | Dealer | Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	13.4		13.4		12.0
Provision for losses	(1.4)		0.2		1.4
Currency translation and other	(0.1)		(0.2)
Ending Balance	11.9		13.4		13.4
Financial Services | Customer Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	97.5		99.2		106.5
Provision for losses	14.8		9.8		13.1
Charge-offs	(18.2)		(21.2)		(32.1)
Recoveries	4.6		9.9		7.0
Currency translation and other	(5.1)		(0.2)		4.7
Ending Balance	93.6		97.5		99.2
Financial Services | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	8.0	[1]	5.6	[1]	8.8	[1]
Provision for losses	1.7	[1]	3.8	[1]	3.7	[1]
Charge-offs	(2.2)	[1]	(2.8)	[1]	(6.6)	[1]
Recoveries	0.7	[1]	1.0	[1]	0.4	[1]
Currency translation and other	(0.7)	[1]	0.4	[1]	(0.7)	[1]
Ending Balance	$ 7.5	[1]	$ 8.0	[1]	$ 5.6	[1]

[1] Operating lease and other trade receivables.