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Inventories Table (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventory [Line Items]    
Finished products $ 488.5 $ 443.6
Work in process and raw materials 508.6 528.9
Inventory, Gross, Total 997.1 972.5
Less LIFO reserve (173.0) (176.0)
Inventories, net $ 824.1 $ 796.5 [1]
[1] The December 31, 2015 consolidated balance sheet has been derived from audited financial statements.