Accounts Payable, Accrued Expenses and Other (Detail) (Truck, Parts and Other, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Truck, Parts and Other
Other Liabilities [Line Items]
Accounts payable	$ 975.8	$ 838.0
Product support reserves	291.7	265.2
Accrued expenses	264.1	261.7
Accrued capital expenditures	139.9	241.1
Salaries and wages	223.9	210.3
Other	259.6	256.9
Accounts payable, accrued expenses and other	$ 2,155.0	$ 2,073.2