Accounts Payable, Accrued Expenses and Other (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 938.6	$ 929.7
Product support liabilities	344.2	384.1
Accrued expenses	233.1	231.4
Accrued capital expenditures	111.2	85.7
Salaries and wages	194.8	197.2
Other	212.2	243.6
Accounts payable, accrued expenses and other	$ 2,034.1	$ 2,071.7