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Operating Segments and Related Disclosures (Tables)
 9 Months Ended
Sep. 30, 2022
Segment Reporting [Abstract]  
Schedule of Selected Financial Information for Each Reportable Segment The following table presents selected financial information for each reportable segment:
Three months ended September 30,Nine months ended September 30,
 2022202120222021
 (In millions)
Net Sales:
Aerospace and Defense$549.2 $544.7 $1,587.6 $1,596.2 
Real Estate0.6 0.6 1.8 2.1 
Total Net Sales$549.8 $545.3 $1,589.4 $1,598.3 
Segment Performance:
Aerospace and Defense$69.5 $76.0 $169.7 $213.3 
Environmental remediation provision adjustments(1.9)(2.2)(2.9)(3.2)
GAAP/Cost Accounting Standards retirement benefits expense difference6.9 2.7 25.2 8.6 
Unusual items (see Note 11) 0.4 (2.9)(15.9)(7.5)
Aerospace and Defense Total74.9 73.6 176.1 211.2 
Real Estate(0.3)(0.1)(0.6)(0.7)
Total Segment Performance$74.6 $73.5 $175.5 $210.5 
Reconciliation of segment performance to income before income taxes:
Segment performance$74.6 $73.5 $175.5 $210.5 
Interest expense(5.1)(4.9)(13.3)(15.1)
Interest income and other2.2 0.2 2.0 1.5 
Stock-based compensation(0.5)(0.5)(2.5)(10.6)
Corporate retirement benefits 0.1 (1.6)0.2 (4.9)
Corporate and other(4.9)(4.2)(19.2)(15.6)
Unusual items (see Note 11)(39.0)(5.2)(53.3)(23.8)
Income before income taxes$27.4 $57.3 $89.4 $142.0 
Summary of Customers that Represented More than 10% of Net Sales
The following table summarizes customers that represented more than 10% of net sales:
Three months ended September 30,Nine months ended September 30,
 2022202120222021
Lockheed Martin 32 %33 %33 %31 %
Raytheon Technologies Corporation21 17 19 17 
NASA19 19 18 21