Allowance for Credit Losses (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for losses		$ 16.5	$ 22.3	$ 18.4
Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		6.0
Ending Balance		6.8	6.0
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		9.3
Ending Balance		3.2	9.3
Financial Services
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		117.2	111.2	114.8
Provision for losses		16.5	22.3	18.4
Charge-offs		(27.5)	(26.7)	(25.0)
Recoveries		10.3	5.3	5.8
Currency translation and other		(2.7)	5.1	(2.8)
Ending Balance		113.8	117.2	111.2
Financial Services | Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		6.0	5.5	7.3
Provision for losses		1.0	0.0	(1.7)
Charge-offs			0.0	0.0
Recoveries			0.0	0.0
Currency translation and other		(0.2)	0.5	(0.1)
Ending Balance		6.8	6.0	5.5
Financial Services | Dealer | Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		9.4	9.6	10.3
Provision for losses		0.7	(0.3)	(0.7)
Charge-offs			0.0	0.0
Recoveries			0.0	0.0
Currency translation and other		(0.1)	0.1	0.0
Ending Balance		10.0	9.4	9.6
Financial Services | Customer Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		92.5	87.5	88.9
Provision for losses		13.6	21.1	18.6
Charge-offs		(20.0)	(24.8)	(22.9)
Recoveries		9.9	5.0	5.5
Currency translation and other		(2.2)	3.7	(2.6)
Ending Balance		93.8	92.5	87.5
Financial Services | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	[1]	9.3	8.6	8.3
Provision for losses	[1]	1.2	1.5	2.2
Charge-offs	[1]	(7.5)	(1.9)	(2.1)
Recoveries	[1]	0.4	0.3	0.3
Currency translation and other	[1]	(0.2)	0.8	(0.1)
Ending Balance	[1]	$ 3.2	$ 9.3	$ 8.6

[1] Operating lease and other trade receivables.