Finance and Other Receivables (Detail) - USD ($) $ in Millions	Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 9,442.4		$ 8,594.7
Finance leases	4,906.6		4,785.7
Dealer wholesale financing	4,944.1		4,147.8
Operating lease receivables and other	166.4		176.5
Finance and other receivables, net of deferred income	19,459.5		17,704.7
Less allowance for losses	(145.2)		(133.0)		$ (121.1)		$ (116.9)
Finance and other receivables, net	19,314.3		17,571.7
Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	(139.2)		(127.0)
Dealer | Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	(3.0)		(2.7)
Dealer | Wholesale | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	(3.0)		(2.7)		(3.4)		(3.3)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	(3.0)		(3.3)
Other | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	$ (3.0)	[1]	$ (3.3)	[1]	$ (2.9)	[1]	$ (2.1)	[2]

[1] Operating lease and other trade receivables.

[2] Operating lease and other trade receivables.