Accounts Payable, Accrued Expenses and Other (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 1,393.5	$ 1,176.2
Product support liabilities	475.0	514.6
Accrued expenses	611.5	446.5
Right-of-return liabilities	436.1	337.3
Accrued capital expenditures	242.2	288.8
Salaries and wages	310.4	260.8
Other	462.2	389.7
Accounts payable, accrued expenses and other	$ 3,930.9	$ 3,413.9