Operating Segments and Related Disclosures (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of Selected Financial Information for Each Reportable Segment

Selected financial information for each operating segment is as follows:

	Three months ended September 30,						Nine months ended September 30,
	2018			2017			2018			2017
	(In millions)
Net Sales:
Aerospace and Defense	$	497.2		$	482.5		$	1,453.2		$	1,344.2
Real Estate	1.6			1.6			4.8			4.8
Total Net Sales	$	498.8		$	484.1		$	1,458.0		$	1,349.0
Segment Performance:
Aerospace and Defense	$	70.7		$	52.9		$	176.8		$	149.9
Environmental remediation provision adjustments	39.9			(0.5		)	37.6			(1.6		)
GAAP/Cost Accounting Standards retirement benefits expense difference	(2.6		)	(5.8		)	(4.8		)	(12.7		)
Unusual items	—			0.1			—			2.0
Aerospace and Defense Total	108.0			46.7			209.6			137.6
Real Estate	0.6			0.5			1.8			2.1
Total Segment Performance	$	108.6		$	47.2		$	211.4		$	139.7
Reconciliation of segment performance to income before income taxes:
Segment performance	$	108.6		$	47.2		$	211.4		$	139.7
Interest expense	(9.1		)	(7.7		)	(25.5		)	(22.9		)
Interest income	2.8			1.0			6.4			2.3
Stock-based compensation expense	(6.2		)	(11.0		)	(12.9		)	(21.2		)
Corporate retirement benefits expense	(3.3		)	(5.0		)	(9.9		)	(15.0		)
Corporate and other expense, net	(5.0		)	(5.9		)	(15.7		)	(17.9		)
Unusual items	(0.2		)	—			(0.2		)	(1.0		)
Income before income taxes	$	87.6		$	18.6		$	153.6		$	64.0

Summary of Customers that Represented More than 10% of Net Sales

Customers that represented more than 10% of net sales for the periods presented were as follows:

	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
Lockheed Martin Corporation	30	%	24	%	29	%	22	%
NASA	19		19		18		19
United Launch Alliance	18		22		19		22
Raytheon Company	16		15		18		15