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Inventories (Tables)
 12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at December 31, 2016 and 2015 were as follows (in millions):
 
 
2016
 
2015
Raw materials and supplies
 
$
149.6

 
$
216.0

Work-in-process
 
837.9

 
990.3

Finished goods
 
161.7

 
184.1

Total inventories at current cost
 
1,149.2

 
1,390.4

Adjustment from current cost to LIFO cost basis
 
97.3

 
136.4

Inventory valuation reserves
 
(169.0
)
 
(206.3
)
Progress payments
 
(40.5
)
 
(48.9
)
Total inventories, net
 
$
1,037.0

 
$
1,271.6
Schedule of Inventory Valuation Impact on Income
 
 
Fiscal year ended December 31,
 
 
2016
2015
2014
LIFO benefit (charge)
 
$
(39.1
)
$
131.6

$
(24.7
)
NRV benefit (charge)
 
39.9

(131.5
)
25.0

Net cost of sales impact
 
$
0.8

$
0.1

$
0.3