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Inventories (Detail) - Truck, Parts and Other - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventory [Line Items]    
Finished products $ 641.8 $ 563.2
Work in process and raw materials 814.6 803.3
Inventories, gross 1,456.4 1,366.5
Less LIFO reserve (183.8) (181.8)
Inventories, net $ 1,272.6 $ 1,184.7 [1]
[1] The December 31, 2018 consolidated balance sheet has been derived from audited financial statements.