Equipment on Operating Leases for Truck and Other Segment and for Financial Services Segment (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property Subject to or Available for Operating Lease [Line Items]
Total	$ 2,303.0	$ 2,803.3	$ 3,188.9
Truck, Parts and Other
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases	177.4	251.7
Less allowance for depreciation	(49.8)	(60.9)
Total	127.6	190.8
Financial Services
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases	3,365.3	3,974.8
Less allowance for depreciation	(1,189.9)	(1,362.3)
Total	$ 2,175.4	$ 2,612.5