Equipment on Operating Leases for Truck and Other Segment and for Financial Services Segment (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property Subject to or Available for Operating Lease [Line Items]
Total	$ 1,960.6	$ 2,303.0	$ 2,803.3
Truck, Parts and Other
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases	90.4	177.4
Less allowance for depreciation	(21.2)	(49.8)
Total	69.2	127.6
Financial Services
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases	2,858.8	3,365.3
Less allowance for depreciation	(967.4)	(1,189.9)
Total	$ 1,891.4	$ 2,175.4