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Inventories (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Inventory [Line Items]    
Finished products $ 627.6 $ 584.6
Work in process and raw materials 685.5 754.9
Inventories, gross 1,313.1 1,339.5
Less LIFO reserve (188.6) (186.3)
Inventories, net $ 1,124.5 $ 1,153.2 [1]
[1] The December 31, 2019 consolidated balance sheet has been derived from audited financial statements.