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Operating Segments and Related Disclosures
 3 Months Ended
Mar. 31, 2020
Segment Reporting [Abstract]  
Operating Segments and Related Disclosures Operating Segments and Related Disclosures
The Company’s operations are organized into two operating segments based on different products and customer bases: Aerospace and Defense, and Real Estate.
The following table presents selected financial information for each reportable segment:
 
Three months ended March 31,
 
2020
 
2019
 
(In millions)
Net Sales:
 
 
 
Aerospace and Defense
$
474.4

 
$
490.0

Real Estate
1.7

 
1.7

Total Net Sales
$
476.1

 
$
491.7

Segment Performance:
 
 
 
Aerospace and Defense
$
52.6

 
$
64.9

Environmental remediation provision adjustments
0.5

 
(0.3
)
GAAP/Cost Accounting Standards retirement benefits expense difference
4.7

 
5.4

Unusual items
—

 
(0.3
)
Aerospace and Defense Total
57.8

 
69.7

Real Estate
(0.6
)
 
0.5

Total Segment Performance
$
57.2

 
$
70.2

Reconciliation of segment performance to income before income taxes:
 
 
 
Segment performance
$
57.2

 
$
70.2

Interest expense
(8.4
)
 
(9.0
)
Interest income
3.2

 
4.0

Stock-based compensation
(2.4
)
 
(5.3
)
Corporate retirement benefits
(2.0
)
 
(1.8
)
Corporate and other
(4.9
)
 
(6.3
)
Income before income taxes
$
42.7

 
$
51.8


The following table summarizes customers that represented more than 10% of net sales, each of which involves sales of several product lines and programs:
 
Three months ended March 31,
 
2020
 
2019
Lockheed Martin Corporation
34
%
 
30
%
NASA
23

 
20

Raytheon Technologies Corporation
16

 
18

United Launch Alliance
*

 
12


______
* Less than 10%.