Equipment on Operating Leases for Truck and Other Segment and for Financial Services Segment (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property Subject to or Available for Operating Lease [Line Items]
Total	$ 3,188.9	$ 3,584.7	$ 3,648.1
Truck, Parts and Other
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases	400.9	576.8
Less allowance for depreciation	(98.5)	(154.9)
Total	302.4	421.9
Financial Services
Property Subject to or Available for Operating Lease [Line Items]
Equipment on operating leases	4,285.6	4,493.9
Less allowance for depreciation	(1,399.1)	(1,331.1)
Total	$ 2,886.5	$ 3,162.8