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Inventories Table (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Finished products $ 574.1 $ 452.3
Work in process and raw materials 581.6 444.7
Inventory, Gross, Total 1,155.7 897.0
Less LIFO reserve (172.7) (169.2)
Inventories, net $ 983.0 $ 727.8 [1]
[1] The December 31, 2016 consolidated balance sheet has been derived from audited financial statements.