Finance and Other Receivables (Detail) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 6,424.7	$ 5,839.1
Finance leases		3,620.6	3,944.7
Dealer wholesale financing		1,865.8	2,012.4
Operating lease receivables and other		126.6	151.5
Finance and other receivables, net of deferred income		12,037.7	11,947.7
Less allowance for losses		(116.9)	(127.0)	[1]	$ (112.4)	$ (113.8)
Finance and other receivables, net		11,920.8	11,820.7
Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(111.5)	(120.4)
Dealer | Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(3.3)	(3.4)
Dealer | Wholesale | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(3.3)	(3.4)		(4.3)	(6.8)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(2.1)	(3.2)
Other | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	[2]	$ (2.1)	$ (3.2)		$ (3.7)	$ (3.2)

[1] The beginning balance has been adjusted for the adoption of ASU 2016-13.

[2] Operating lease and other trade receivables.