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Inventories Table (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Inventory [Line Items]    
Finished products $ 513.4 $ 512.3
Work in process and raw materials 554.3 587.7
Inventory, Gross, Total 1,067.7 1,100.0
Less LIFO reserve (174.6) (174.3)
Inventories, net $ 893.1 $ 925.7 [1]
[1] The December 31, 2014 consolidated balance sheet has been derived from audited financial statements.