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Inventories (Tables)
 9 Months Ended
Sep. 30, 2013
Inventory Disclosure (Tables) [Abstract]  
Inventories
Inventories at September 30, 2013 and December 31, 2012 were as follows (in millions):
 
 
September 30,
2013
 
December 31,
2012
Raw materials and supplies
$
330.7

 
$
351.6

Work-in-process
900.3

 
1,063.9

Finished goods
164.7

 
209.0

Total inventories at current cost
1,395.7

 
1,624.5

Less allowances to reduce current cost values to LIFO basis
(12.4
)
 
(76.9
)
Progress payments
(38.4
)
 
(11.0
)
Total inventories, net
$
1,344.9

 
$
1,536.6