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Inventories Table (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventory [Line Items]    
Finished products $ 602.5 $ 515.7
Work in process and raw materials 641.1 586.2
Inventory, Gross, Total 1,243.6 1,101.9
Less LIFO reserve (175.3) (173.5)
Inventories, net $ 1,068.3 $ 928.4 [1]
[1] The December 31, 2017 consolidated balance sheet has been derived from audited financial statements.