Assets and Liabilities Fair Value Measurements (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets:
Derivative contracts	$ 1.2	$ 4.0
Liabilities:
Derivative contracts	5.2	19.7
Fair Value, Inputs, Level 2 | Fair Value Measurements, Nonrecurring
Assets:
Used trucks held for sale	29.7	0.2
Fair Value, Inputs, Level 2 | Fair Value, Assets and Liabilities Measured on Recurring Basis
Assets:
Derivative contracts	1.2	4.0
Liabilities:
Derivative contracts	$ 5.2	$ 19.7