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Inventories (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Inventory [Line Items]            
Raw materials and supplies $ 204.3   $ 204.3     $ 162.8
Work-in-process 929.9   929.9     955.5
Finished goods 190.0   190.0     165.0
Total inventories at current cost 1,324.2   1,324.2     1,283.3
Adjustment from current cost to LIFO cost basis 1.7   1.7     43.1
Inventory valuation reserves (86.1)   (86.1)     (121.5)
Progress payments 0.0   0.0     (28.8)
Total inventories, net 1,239.8   1,239.8     1,176.1
LIFO benefit (charge)     (29.5) $ (51.5)    
NRV benefit (charge)     29.5 51.3    
Net cost of sales impact 0.0 $ (0.1) 0.0 $ (0.2)    
ASU 2014-09            
Inventory [Line Items]            
Adjustment from current cost to LIFO cost basis         $ (11.8)  
Inventory valuation reserves         11.8  
Total inventories, net 14.2   14.2   28.8  
Net Realizable Value Reserve [Member]            
Inventory [Line Items]            
Inventory valuation reserves (6.2)   (6.2)     $ (47.5)
Revenue Recognized Over-time | ASU 2014-09            
Inventory [Line Items]            
Total inventories, net $ 4.1   $ 4.1   $ (34.2)