Estimated Value of Returned Goods Assets and Related Return Liabilities (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Trucks
Entity Wide Information Revenue From External Customer [Line Items]
Other current assets	$ 222.1	$ 255.7
Accounts payable, accrued expenses and other	226.2	264.0
Other noncurrent assets, net	364.9	403.6
Other liabilities	383.0	423.9
Assets	587.0	659.3
Liabilities	609.2	687.9
Parts Subsegment
Entity Wide Information Revenue From External Customer [Line Items]
Accounts payable, accrued expenses and other	193.8	172.1
Other noncurrent assets, net	82.3	72.9
Assets	82.3	72.9
Liabilities	$ 193.8	$ 172.1