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Inventories (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Inventory [Line Items]    
Finished products $ 637.6 $ 515.7
Work in process and raw materials 834.2 586.2
Inventories, gross 1,471.8 1,101.9
Less LIFO reserve (179.8) (173.5)
Inventories, net $ 1,292.0 $ 928.4 [1]
[1] The December 31, 2017 consolidated balance sheet has been derived from audited financial statements.