Finance and Other Receivables (Detail) - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 6,720.9	$ 6,424.7
Finance leases		3,531.2	3,620.6
Dealer wholesale financing		2,385.8	1,865.8
Operating lease receivables and other		130.9	126.6
Finance and other receivables, net of deferred income		12,768.8	12,037.7
Less allowance for losses		(119.6)	(116.9)	$ (125.3)	$ (127.0)
Finance and other receivables, net		12,649.2	11,920.8
Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(112.8)	(111.5)
Dealer | Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(3.9)	(3.3)
Dealer | Wholesale | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(3.9)	(3.3)	(3.4)	(3.4)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(2.9)	(2.1)
Other | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	[1]	$ (2.9)	$ (2.1)	$ (3.6)	$ (3.2)

[1] Operating leases and other trade receivables.