Allowance for Credit Losses (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for losses		$ 5.9	$ 3.4
Financial Services
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		111.2	114.8
Provision for losses		5.9	3.4
Charge-offs		(6.8)	(5.9)
Recoveries		1.4	0.7
Currency translation and other		2.2	1.9
Ending Balance		113.9	114.9
Financial Services | Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		5.5	7.3
Provision for losses		0.0	(0.5)
Charge-offs		0.0	0.0
Recoveries		0.0	0.1
Currency translation and other		0.1	0.2
Ending Balance		5.6	7.1
Financial Services | Dealer | Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		9.6	10.3
Provision for losses		(0.3)	(0.5)
Charge-offs		0.0	0.0
Recoveries		0.0	0.0
Currency translation and other		0.1	0.1
Ending Balance		9.4	9.9
Financial Services | Customer Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		87.5	88.9
Provision for losses		5.9	3.2
Charge-offs		(6.5)	(5.4)
Recoveries		1.4	0.6
Currency translation and other		2.0	1.2
Ending Balance		90.3	88.5
Financial Services | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	[1]	8.6	8.3
Provision for losses	[1]	0.3	1.2
Charge-offs	[1]	(0.3)	(0.5)
Recoveries	[1]	0.0	0.0
Currency translation and other	[1]	0.0	0.4
Ending Balance	[1]	$ 8.6	$ 9.4

[1] Operating leases and other trade receivables.