Finance and Other Receivables (Detail) - Financial Services - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 4,011.7	$ 3,968.5
Direct financing leases		2,719.5	2,752.8
Sales-type finance leases		969.8	972.8
Dealer wholesale financing		1,950.1	1,755.8
Operating lease receivables and other		131.9	99.5
Unearned interest: Finance leases		(364.6)	(384.8)
Finance and other receivables, net of deferred income		9,418.4	9,164.6
Less allowance for losses		(114.8)	(122.0)	$ (129.3)	$ (130.0)
Finance and other receivables, net		9,303.6	9,042.6
Loans And Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(99.2)	(105.5)
Dealer | Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(7.3)	(9.0)	(10.4)	(11.8)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	[1]	$ (8.3)	$ (7.5)	$ (8.0)	$ (5.6)

[1] Operating lease and other trade receivables.