Finance and Other Receivables (Detail) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 8,022.1	$ 7,229.1
Finance leases		4,428.6	3,786.4
Dealer wholesale financing		3,783.2	2,772.1
Operating lease receivables and other		151.3	125.4
Finance and other receivables, net of deferred income		16,385.2	13,913.0
Less allowance for losses		(124.8)	(121.1)	$ (117.9)	$ (116.9)
Finance and other receivables, net		16,260.4	13,791.9
Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(119.6)	(114.8)
Dealer | Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(2.6)	(3.4)
Dealer | Wholesale | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(2.6)	(3.4)	(3.5)	(3.3)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(2.6)	(2.9)
Other | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	[1]	$ (2.6)	$ (2.9)	$ (3.1)	$ (2.1)

[1] Operating leases and other trade receivables.