Allowance for Credit Losses (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for losses				$ 12.7	$ 9.4
Financial Services
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				111.2	114.8
Provision for losses		$ 6.8	$ 6.0	12.7	9.4
Charge-offs				(12.0)	(11.3)
Recoveries				2.3	1.4
Currency translation and other				4.8	0.1
Ending Balance		119.0	114.4	119.0	114.4
Financial Services | Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				5.5	7.3
Provision for losses				0.0	(1.1)
Charge-offs				0.0	0.0
Recoveries				0.0	0.0
Currency translation and other				0.4	0.1
Ending Balance		5.9	6.3	5.9	6.3
Financial Services | Dealer | Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				9.6	10.3
Provision for losses				(0.7)	(0.5)
Charge-offs				0.0	0.0
Recoveries				0.0	0.0
Currency translation and other				0.2	0.1
Ending Balance		9.1	9.9	9.1	9.9
Financial Services | Customer Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				87.5	88.9
Provision for losses				12.8	9.6
Charge-offs				(11.5)	(9.7)
Recoveries				2.2	1.3
Currency translation and other				3.8	(0.4)
Ending Balance		94.8	89.7	94.8	89.7
Financial Services | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	[1]			8.6	8.3
Provision for losses	[1]			0.6	1.4
Charge-offs	[1]			(0.5)	(1.6)
Recoveries	[1]			0.1	0.1
Currency translation and other	[1]			0.4	0.3
Ending Balance	[1]	$ 9.2	$ 8.5	$ 9.2	$ 8.5

[1] Operating leases and other trade receivables.