Allowance for Credit Losses (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for losses		$ 2.2	$ 5.9
Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		6.8
Ending Balance		7.0
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		3.2
Ending Balance		3.6
Financial Services
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		113.8	117.2
Provision for losses		2.2	5.9
Charge-offs		(4.1)	(4.4)
Recoveries		4.8	1.7
Currency translation and other		0.2	1.4
Ending Balance		116.9	121.8
Financial Services | Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		6.8	6.0
Provision for losses		0.2	0.3
Recoveries			0.1
Currency translation and other			0.1
Ending Balance		7.0	6.5
Financial Services | Dealer | Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		10.0	9.4
Provision for losses		(0.2)
Ending Balance		9.8	9.4
Financial Services | Customer Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		93.8	92.5
Provision for losses		1.6	5.0
Charge-offs		(3.9)	(4.2)
Recoveries		4.8	1.6
Currency translation and other		0.2	1.1
Ending Balance		96.5	96.0
Financial Services | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	[1]	3.2	9.3
Provision for losses	[1]	0.6	0.6
Charge-offs	[1]	(0.2)	(0.2)
Currency translation and other	[1]		0.2
Ending Balance	[1]	$ 3.6	$ 9.9

[1] Operating leases and other trade receivables.