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Inventories Table (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory [Line Items]    
Finished products $ 590.6 $ 515.7
Work in process and raw materials 846.0 586.2
Inventory, Gross, Total 1,436.6 1,101.9
Less LIFO reserve (178.1) (173.5)
Inventories, net $ 1,258.5 $ 928.4 [1]
[1] The December 31, 2017 consolidated balance sheet has been derived from audited financial statements.