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Inventories Schedule of Inventory (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Inventory, Gross [Abstract]    
Raw materials and supplies $ 191.5 $ 162.8
Work-in-process 914.1 955.5
Finished goods 191.1 165.0
Total inventories at current cost 1,296.7 1,283.3
Adjustment from current cost to LIFO cost basis 2.9 43.1
Inventory valuation reserves (88.5) (121.5)
Progress payments 0.0 (28.8)
Total inventories, net $ 1,211.1 $ 1,176.1