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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories at June 30, 2017 and December 31, 2016 were as follows (in millions):
 
June 30,
2017
 
December 31,
2016
Raw materials and supplies
$
141.6

 
$
149.6

Work-in-process
886.7

 
837.9

Finished goods
159.4

 
161.7

Total inventories at current cost
1,187.7

 
1,149.2

Adjustment from current cost to LIFO cost basis
79.1

 
97.3

Inventory valuation reserves
(150.2
)
 
(169.0
)
Progress payments
(40.4
)
 
(40.5
)
Total inventories, net
$
1,076.2

 
$
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):
 
 
Six months ended June 30,
 
 
2017
 
2016
LIFO benefit (charge)
 
$
(18.2
)
 
$
(4.6
)
NRV benefit (charge)
 
18.1

 
5.0

Net cost of sales impact
 
$
(0.1
)
 
$
0.4