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Inventories (Tables)
 3 Months Ended
Mar. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories at March 31, 2017 and December 31, 2016 were as follows (in millions):
 
March 31,
2017
 
December 31,
2016
Raw materials and supplies
$
148.8

 
$
149.6

Work-in-process
855.5

 
837.9

Finished goods
160.0

 
161.7

Total inventories at current cost
1,164.3

 
1,149.2

Adjustment from current cost to LIFO cost basis
89.3

 
97.3

Inventory valuation reserves
(157.6
)
 
(169.0
)
Progress payments
(44.1
)
 
(40.5
)
Total inventories, net
$
1,051.9

 
$
1,037.0
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,
 
 
2017
 
2016
LIFO benefit (charge)
 
$
(8.1
)
 
$
(0.3
)
NRV benefit (charge)
 
8.1

 
0.3

Net cost of sales impact
 
$
—

 
$
—