Allowance for Credit Losses (Detail) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for losses		$ 11.8	$ 14.8
Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		6.8
Ending Balance		6.4
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		3.2
Ending Balance		3.5
Financial Services
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		113.8	117.2
Provision for losses		11.8	14.8
Charge-offs		(18.5)	(22.0)
Recoveries		8.9	7.0
Currency translation and other		(1.1)	(1.3)
Ending Balance		114.9	115.7
Financial Services | Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		6.8	6.0
Provision for losses			0.6
Charge-offs		(0.2)
Currency translation and other		(0.2)
Ending Balance		6.4	6.6
Financial Services | Dealer | Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		10.0	9.4
Provision for losses		(0.9)	(0.1)
Currency translation and other		0.2
Ending Balance		9.3	9.3
Financial Services | Customer Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		93.8	92.5
Provision for losses		9.7	12.8
Charge-offs		(15.6)	(15.5)
Recoveries		8.8	6.7
Currency translation and other		(1.0)	(1.1)
Ending Balance		95.7	95.4
Financial Services | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	[1]	3.2	9.3
Provision for losses	[1]	3.0	1.5
Charge-offs	[1]	(2.7)	(6.5)
Recoveries	[1]	0.1	0.3
Currency translation and other	[1]	(0.1)	(0.2)
Ending Balance	[1]	$ 3.5	$ 4.4

[1] Operating leases and other trade receivables.