Accounts Payable, Accrued Expenses and Other (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 1,115.7		$ 1,304.9
Product support liabilities	508.1		446.7
Accrued expenses	693.4		626.5
Accrued capital expenditures	270.3		98.8
Salaries and wages	271.8		267.7
Other	334.9		283.1
Accounts payable, accrued expenses and other	$ 3,194.2	$ 3,040.3	$ 3,027.7