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Inventories (Tables)
9 Months Ended
Sep. 30, 2015
Inventory Disclosure [Abstract]  
Inventories
Inventories at September 30, 2015 and December 31, 2014 were as follows (in millions):
 
September 30,
2015
 
December 31,
2014
Raw materials and supplies
$
235.0

 
$
249.3

Work-in-process
1,052.2

 
1,184.1

Finished goods
190.0

 
172.2

Total inventories at current cost
1,477.2

 
1,605.6

Adjustment from current cost to LIFO cost basis
85.1

 
4.8

Inventory valuation reserves
(152.9
)
 
(68.8
)
Progress payments
(53.3
)
 
(68.8
)
Total inventories, net
$
1,356.1

 
$
1,472.8