Estimated Value of Returned Goods Assets and Related Return Liabilities (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Trucks
Entity Wide Information Revenue From External Customer [Line Items]
Other current assets	$ 262.2	$ 255.7
Accounts payable, accrued expenses and other	267.9	264.0
Other noncurrent assets, net	375.7	403.6
Other liabilities	396.0	423.9
Assets	637.9	659.3
Liabilities	663.9	687.9
Parts Subsegment
Entity Wide Information Revenue From External Customer [Line Items]
Accounts payable, accrued expenses and other	188.3	172.1
Other noncurrent assets, net	80.0	72.9
Assets	80.0	72.9
Liabilities	$ 188.3	$ 172.1