Accounts Payable, Accrued Expenses and Other (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 929.7	$ 1,167.6
Product support liabilities	384.1	355.3
Accrued expenses	231.4	213.5
Accrued capital expenditures	85.7	63.9
Salaries and wages	197.2	224.9
Other	243.6	272.0
Accounts payable, accrued expenses and other	$ 2,071.7	$ 2,297.2