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Inventories Table (Detail) (Truck, Parts and Other, USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Truck, Parts and Other
   
Inventory [Line Items]    
Finished products $ 589.0 $ 440.6
Work in process and raw materials 572.4 545.2
Inventory, Gross, Total 1,161.4 985.8
Less LIFO reserve (173.3) (172.2)
Inventories, net $ 988.1 $ 813.6 [1]
[1] The December 31, 2013 consolidated balance sheet has been derived from audited financial statements.