Estimated Value of Returned Goods Assets and Related Return Liabilities (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Trucks
Entity Wide Information Revenue From External Customer [Line Items]
Other current assets	$ 183.0	$ 255.7
Accounts payable, accrued expenses and other	185.0	264.0
Other noncurrent assets, net	284.6	403.6
Other liabilities	298.9	423.9
Assets	467.6	659.3
Liabilities	483.9	687.9
Parts Subsegment
Entity Wide Information Revenue From External Customer [Line Items]
Accounts payable, accrued expenses and other	181.4	172.1
Other noncurrent assets, net	77.7	72.9
Assets	77.7	72.9
Liabilities	$ 181.4	$ 172.1