Finance and Other Receivables (Detail) - USD ($) $ in Millions		Sep. 30, 2019	Dec. 31, 2018		Sep. 30, 2018	Dec. 31, 2017
Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 5,021.1	$ 4,630.5
Finance leases		3,795.0	3,807.2
Dealer wholesale financing		2,813.5	2,342.3
Operating lease receivables and other		157.0	174.6
Finance and other receivables, net of deferred income		11,786.6	10,954.6
Less allowance for losses		(114.9)	(113.8)		$ (115.7)	$ (117.2)
Finance and other receivables, net		11,671.7	10,840.8	[1]
Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(105.0)	(103.8)
Dealer | Wholesale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(6.4)	(6.8)
Dealer | Wholesale | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(6.4)	(6.8)		(6.6)	(6.0)
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses		(3.5)	(3.2)
Other | Financial Services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for losses	[2]	$ (3.5)	$ (3.2)		$ (4.4)	$ (9.3)

[1] The December 31, 2018 consolidated balance sheet has been derived from audited financial statements.

[2] Operating leases and other trade receivables.