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INVENTORIES, NET - Components of Inventories, Net (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 63.7 $ 55.9
Work in process 84.4 54.8
Raw materials 208.0 184.4
Inventoried costs related to long-term contracts 37.4 38.1
Total inventory before progress payments 393.5 333.2
Less: Progress payments (see Note 2) 0.0 (21.3)
Inventories, net $ 393.5 $ 311.9