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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories at December 31, 2017 and 2016 were as follows (in millions):
 
 
2017
 
2016
Raw materials and supplies
 
$
162.8

 
$
149.6

Work-in-process
 
955.5

 
837.9

Finished goods
 
165.0

 
161.7

Total inventories at current cost
 
1,283.3

 
1,149.2

Adjustment from current cost to LIFO cost basis
 
43.1

 
97.3

Inventory valuation reserves
 
(121.5
)
 
(169.0
)
Progress payments
 
(28.8
)
 
(40.5
)
Total inventories, net
 
$
1,176.1

 
$
1,037.0
Schedule of Inventory Valuation Impact on Income
 
 
Fiscal year ended December 31,
 
 
2017
2016
2015
LIFO benefit (charge)
 
$
(54.2
)
$
(39.1
)
$
131.6

NRV benefit (charge)
 
54.0

39.9

(131.5
)
Net cost of sales impact
 
$
(0.2
)
$
0.8

$
0.1