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Inventories (Tables)
 12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at December 31, 2014 and 2013 were as follows (in millions):
 
 
2014
 
2013
Raw materials and supplies
 
$
249.3

 
$
277.6

Work-in-process
 
1,184.1

 
984.9

Finished goods
 
172.2

 
162.1

Total inventories at current cost
 
1,605.6

 
1,424.6

Adjustment from current cost to LIFO cost basis
 
4.8

 
29.4

Inventory valuation reserves
 
(68.8
)
 
(84.3
)
Progress payments
 
(68.8
)
 
(47.6
)
Total inventories, net
 
$
1,472.8

 
$
1,322.1