Accounts Payable, Accrued Expenses and Other (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 1,667.6	$ 1,665.1
Product support liabilities	867.8	542.9
Accrued expenses	936.5	808.4
Right-of-return liabilities	365.8	366.4
Accrued capital expenditures	225.1	221.2
Salaries and wages	401.5	351.8
Other	612.0	555.9
Accounts payable, accrued expenses and other	$ 5,076.3	$ 4,511.7