Allowance for Credit Losses (Detail) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for losses		$ 6.2	$ 10.5
Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		6.8
Ending Balance		6.5
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		3.2
Ending Balance		4.0
Financial Services
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		113.8	117.2
Provision for losses		6.2	10.5
Charge-offs		(9.1)	(18.3)
Recoveries		7.0	5.0
Currency translation and other		0.6	(1.7)
Ending Balance		118.5	112.7
Financial Services | Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		6.8	6.0
Provision for losses		(0.1)	0.2
Charge-offs		(0.1)
Currency translation and other		(0.1)
Ending Balance		6.5	6.2
Financial Services | Dealer | Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		10.0	9.4
Provision for losses		(0.4)	(0.1)
Currency translation and other		0.1	(0.1)
Ending Balance		9.7	9.2
Financial Services | Customer Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		93.8	92.5
Provision for losses		5.4	10.0
Charge-offs		(8.4)	(12.1)
Recoveries		6.9	4.7
Currency translation and other		0.6	(1.6)
Ending Balance		98.3	93.5
Financial Services | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	[1]	3.2	9.3
Provision for losses	[1]	1.3	0.4
Charge-offs	[1]	(0.6)	(6.2)
Recoveries	[1]	0.1	0.3
Ending Balance	[1]	$ 4.0	$ 3.8

[1] Operating leases and other trade receivables.