Finance and Other Receivables (Detail) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 5,241.7	$ 4,630.5
Finance leases		3,906.7	3,807.2
Dealer wholesale financing		2,907.4	2,342.3
Operating lease receivables and other		142.6	174.6
Finance and other receivables, net of deferred income		12,198.4	10,954.6
Less allowance for losses		(112.4)	(113.8)	$ (117.2)	$ (111.2)
Finance and other receivables, net		12,086.0	10,840.8
Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(104.4)	(103.8)
Dealer | Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(4.3)	(6.8)
Dealer | Wholesale | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(4.3)	(6.8)	(6.0)	(5.5)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(3.7)	(3.2)
Other | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	[1]	$ (3.7)	$ (3.2)	$ (9.3)	$ (8.6)

[1] Operating lease and other trade receivables.