Estimated Value of Returned Goods Assets and Related Return Liabilities (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Trucks
Entity Wide Information Revenue From External Customer [Line Items]
Other current assets	$ 177.8	$ 255.7
Accounts payable, accrued expenses and other	180.5	264.0
Other noncurrent assets, net	290.8	403.6
Other liabilities	304.9	423.9
Assets	468.6	659.3
Liabilities	485.4	687.9
Parts Subsegment
Entity Wide Information Revenue From External Customer [Line Items]
Accounts payable, accrued expenses and other	193.5	172.1
Other noncurrent assets, net	82.0	72.9
Assets	82.0	72.9
Liabilities	$ 193.5	$ 172.1