Finance and Other Receivables (Detail) - Financial Services - USD ($) $ in Millions		Jun. 30, 2017	Dec. 31, 2016		Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 3,923.3	$ 3,948.6
Direct financing leases		3,065.0	2,798.0
Sales-type finance leases		768.8	867.3
Dealer wholesale financing		1,764.0	1,528.5
Operating lease receivables and other		187.2	150.9
Unearned interest: Finance leases		(360.4)	(344.7)
Finance and other receivables, net of deferred income		9,347.9	8,948.6
Less allowance for losses		(119.0)	(111.2)		$ (114.4)	$ (114.8)
Finance and other receivables, net		9,228.9	8,837.4	[1]
Loans And Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(103.9)	(97.1)
Dealer | Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(5.9)	(5.5)		(6.3)	(7.3)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	[2]	$ (9.2)	$ (8.6)		$ (8.5)	$ (8.3)

[1] The December 31, 2016 consolidated balance sheet has been derived from audited financial statements.

[2] Operating leases and other trade receivables.