Allowance for Credit Losses (Detail) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]
Provision for losses		$ 50.2	$ 14.1
Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		2.7
Ending Balance		3.0
Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		3.3
Ending Balance		2.9
Financial Services
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		133.0	121.1
Provision for losses		50.2	14.1
Charge-offs		(39.5)	(17.2)
Recoveries		6.8	5.6
Currency translation and other		(4.3)	1.2
Ending Balance		146.2	124.8
Financial Services | Dealer | Wholesale
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		2.7	3.4
Provision for losses		0.4	(0.8)
Currency translation and other		(0.1)
Ending Balance		3.0	2.6
Financial Services | Dealer | Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		1.9	2.2
Provision for losses		(0.4)	(0.8)
Ending Balance		1.5	1.4
Financial Services | Customer Retail
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		125.1	112.6
Provision for losses		50.8	16.3
Charge-offs		(38.9)	(16.0)
Recoveries		5.7	4.3
Currency translation and other		(3.9)	1.0
Ending Balance		138.8	118.2
Financial Services | Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	[1]	3.3	2.9
Provision for losses	[1]	(0.6)	(0.6)
Charge-offs	[1]	(0.6)	(1.2)
Recoveries	[1]	1.1	1.3
Currency translation and other	[1]	(0.3)	0.2
Ending Balance	[1]	$ 2.9	$ 2.6

[1] Operating leases and other trade receivables.