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Inventories (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Inventory [Line Items]            
Raw materials and supplies $ 187.7   $ 187.7     $ 162.8
Work-in-process 972.8   972.8     955.5
Finished goods 176.9   176.9     165.0
Total inventories at current cost 1,337.4   1,337.4     1,283.3
Adjustment from current cost to LIFO cost basis 3.7   3.7     43.1
Inventory valuation reserves (87.0)   (87.0)     (121.5)
Progress payments 0.0   0.0     (28.8)
Total inventories, net 1,254.1   1,254.1     1,176.1
LIFO benefit (charge)     (27.5) $ (18.2)    
NRV benefit (charge)     27.5 18.1    
Net cost of sales impact 0.0 $ (0.1) 0.0 $ (0.1)    
ASU 2014-09            
Inventory [Line Items]            
Adjustment from current cost to LIFO cost basis         $ (11.8)  
Inventory valuation reserves         11.8  
Total inventories, net 18.1   18.1   28.8  
Net Realizable Value Reserve [Member]            
Inventory [Line Items]            
Inventory valuation reserves (8.2)   (8.2)     $ (47.5)
Revenue Recognized Over-time | ASU 2014-09            
Inventory [Line Items]            
Total inventories, net $ 5.2   $ 5.2   $ (34.2)