Allowance for Credit Losses (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for losses		$ 15.4	$ 16.5	$ 22.3
Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		6.8
Ending Balance		4.3	6.8
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		3.2
Ending Balance		3.7	3.2
Financial Services
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		113.8	117.2	111.2
Provision for losses		15.4	16.5	22.3
Charge-offs		(28.4)	(27.5)	(26.7)
Recoveries		11.0	10.3	5.3
Currency translation and other		0.6	(2.7)	5.1
Ending Balance		112.4	113.8	117.2
Financial Services | Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		6.8	6.0	5.5
Provision for losses		(1.6)	1.0
Charge-offs		(0.6)
Currency translation and other		(0.3)	(0.2)	0.5
Ending Balance		4.3	6.8	6.0
Financial Services | Dealer | Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		10.0	9.4	9.6
Provision for losses		(1.0)	0.7	(0.3)
Currency translation and other		0.2	(0.1)	0.1
Ending Balance		9.2	10.0	9.4
Financial Services | Customer Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		93.8	92.5	87.5
Provision for losses		14.2	13.6	21.1
Charge-offs		(24.2)	(20.0)	(24.8)
Recoveries		10.7	9.9	5.0
Currency translation and other		0.7	(2.2)	3.7
Ending Balance		95.2	93.8	92.5
Financial Services | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	[1]	3.2	9.3	8.6
Provision for losses	[1]	3.8	1.2	1.5
Charge-offs	[1]	(3.6)	(7.5)	(1.9)
Recoveries	[1]	0.3	0.4	0.3
Currency translation and other	[1]		(0.2)	0.8
Ending Balance	[1]	$ 3.7	$ 3.2	$ 9.3

[1] Operating lease and other trade receivables.