Estimated Value of Returned Goods Assets and Related Return Liabilities (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Trucks
Entity Wide Information Revenue From External Customer [Line Items]
Other current assets	$ 191.1	$ 183.0
Accounts payable, accrued expenses and other	192.3	185.0
Other noncurrent assets, net	234.7	284.6
Other liabilities	246.7	298.9
Assets	425.8	467.6
Liabilities	439.0	483.9
Parts Subsegment
Entity Wide Information Revenue From External Customer [Line Items]
Accounts payable, accrued expenses and other	200.7	181.4
Other noncurrent assets, net	82.3	77.7
Assets	82.3	77.7
Liabilities	$ 200.7	$ 181.4