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Inventoried Costs (Details) - USD ($)
$ in Millions
Apr. 01, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 33.2 $ 35.9
Work in process 13.0 11.4
Finished goods 2.0 2.3
Subtotal inventoried costs 48.2 49.6
Less: Customer advances and progress payments 0.0 (0.6)
Total inventoried costs $ 48.2 $ 49.0