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Inventories (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Inventory [Line Items]    
Finished products $ 687.5 $ 610.0
Work in process and raw materials 2,027.4 801.9
Inventories, gross 2,714.9 1,411.9
Less LIFO reserve (198.2) (190.0)
Inventories, net $ 2,516.7 $ 1,221.9 [1]
[1] The December 31, 2020 consolidated balance sheet has been derived from audited financial statements.