Accounts Payable, Accrued Expenses and Other (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Accounts Payable and Accrued Liabilities [Line Items]
Accounts payable	$ 1,598.7	$ 1,667.6
Product support liabilities	743.0	867.8
Accrued expenses	916.5	936.5
Right-of-return liabilities	366.1	365.8
Accrued capital expenditures	182.7	225.1
Salaries and wages	397.1	401.5
Other	601.0	612.0
Accounts payable, accrued expenses and other	$ 4,805.1	$ 5,076.3