Finance and Other Receivables (Detail) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 8,700.0	$ 8,594.7
Finance leases		4,782.2	4,785.7
Dealer wholesale financing		4,352.2	4,147.8
Operating lease receivables and other		178.0	176.5
Finance and other receivables, net of deferred income		18,012.4	17,704.7
Less allowance for losses		(139.3)	(133.0)	$ (123.8)	$ (121.1)
Finance and other receivables, net		17,873.1	17,571.7
Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(133.3)	(127.0)
Dealer | Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(2.7)	(2.7)
Dealer | Wholesale | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(2.7)	(2.7)	(3.6)	(3.4)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(3.3)	(3.3)
Other | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	[1]	$ (3.3)	$ (3.3)	$ (3.1)	$ (2.9)

[1] Operating leases and other trade receivables.