Estimated Value of Returned Goods Assets and Related Return Liabilities (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Trucks
Entity Wide Information Revenue From External Customer [Line Items]
Other current assets	$ 196.6	$ 183.0
Accounts payable, accrued expenses and other	198.1	185.0
Other noncurrent assets, net	261.2	284.6
Other liabilities	274.3	298.9
Assets	457.8	467.6
Liabilities	472.4	483.9
Parts Subsegment
Entity Wide Information Revenue From External Customer [Line Items]
Accounts payable, accrued expenses and other	199.2	181.4
Other noncurrent assets, net	83.9	77.7
Assets	83.9	77.7
Liabilities	$ 199.2	$ 181.4