Product Support Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Product Liability Contingency [Line Items]
Warranty Reserves	$ 437.7	$ 344.3
Deferred Revenues	904.9	775.2
Truck, Parts and Other
Product Liability Contingency [Line Items]
Warranty Reserves	437.7	344.3	$ 389.7	$ 440.0
Truck, Parts and Other | Accounts payable, accrued expenses and other
Product Liability Contingency [Line Items]
Warranty Reserves	279.2	215.5
Deferred Revenues	263.7	259.5
Truck, Parts and Other | Other liabilities
Product Liability Contingency [Line Items]
Warranty Reserves	158.5	128.8
Deferred Revenues	628.8	503.2
Financial Services | Accounts payable, accrued expenses and other
Product Liability Contingency [Line Items]
Warranty Reserves	0.0	0.0
Deferred Revenues	4.9	4.6
Financial Services | Deferred Taxes and Other Liabilities
Product Liability Contingency [Line Items]
Warranty Reserves	0.0	0.0
Deferred Revenues	$ 7.5	$ 7.9