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Inventories (Tables)
 3 Months Ended
Mar. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories at March 31, 2016 and December 31, 2015 were as follows (in millions):
 
March 31,
2016
 
December 31,
2015
Raw materials and supplies
$
207.5

 
$
216.0

Work-in-process
910.5

 
990.3

Finished goods
164.7

 
184.1

Total inventories at current cost
1,282.7

 
1,390.4

Adjustment from current cost to LIFO cost basis
136.1

 
136.4

Inventory valuation reserves
(206.4
)
 
(206.3
)
Progress payments
(46.1
)
 
(48.9
)
Total inventories, net
$
1,166.3

 
$
1,271.6
Schedule of Inventory Valuation Impact on Income
Impacts to cost of sales for changes in the LIFO costing methodology and associated NRV inventory reserves were as follows (in millions):
 
 
Three months ended March 31,
 
 
2016
 
2015
LIFO charge
 
$
(0.3
)
 
$
(0.5
)
NRV benefit
 
0.3

 
0.5

Net cost of sales impact
 
$
—

 
$
—