Finance and Other Receivables (Detail) - Financial Services - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 3,948.6	$ 4,011.7
Direct financing leases		2,798.0	2,719.5
Sales-type finance leases		867.3	969.8
Dealer wholesale financing		1,528.5	1,950.1
Operating lease receivables and other		150.9	131.9
Unearned interest: Finance leases		(344.7)	(364.6)
Finance and other receivables, net of deferred income		8,948.6	9,418.4
Less allowance for losses		(111.2)	(114.8)	$ (122.0)	$ (129.3)
Finance and other receivables, net		8,837.4	9,303.6
Loans And Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(97.1)	(99.2)
Dealer | Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(5.5)	(7.3)	(9.0)	(10.4)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	[1]	$ (8.6)	$ (8.3)	$ (7.5)	$ (8.0)

[1] Operating lease and other trade receivables.