Allowance for Credit Losses (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for losses		$ 17.0		$ 2.2
Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		4.3
Ending Balance		4.3
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		3.7
Ending Balance		3.4
Financial Services
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		118.6	[1]	113.8
Provision for losses		17.0	[1]	2.2
Charge-offs		(10.7)	[1]	(4.1)
Recoveries		1.5	[1]	4.8
Currency translation and other		(5.3)	[1]	0.2
Ending Balance		121.1	[1]	116.9
Financial Services | Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		4.3		6.8
Provision for losses		0.2		0.2
Currency translation and other		(0.2)
Ending Balance		4.3		7.0
Financial Services | Dealer | Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		9.2		10.0
Provision for losses		0.1		(0.2)
Currency translation and other		(0.1)
Ending Balance		9.2		9.8
Financial Services | Customer Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		101.4		93.8
Provision for losses		16.7		1.6
Charge-offs		(10.5)		(3.9)
Recoveries		1.3		4.8
Currency translation and other		(4.7)		0.2
Ending Balance		104.2		96.5
Financial Services | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	[2]	3.7		3.2
Provision for losses	[2]			0.6
Charge-offs	[2]	(0.2)		(0.2)
Recoveries	[2]	0.2
Currency translation and other	[2]	(0.3)
Ending Balance	[2]	$ 3.4		$ 3.6

[1] The beginning balance has been adjusted for the adoption of ASU 2016-13.

[2] Operating leases and other trade receivables.