Operating Segments and Related Disclosures (Tables)

6 Months Ended

Jun. 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 June 30,						Six months ended June 30,
	2018			2017			2018			2017
	(In millions)
Net Sales:
Aerospace and Defense	$	465.6		$	458.0		$	956.0		$	861.7
Real Estate	1.6			1.6			3.2			3.2
Total Net Sales	$	467.2		$	459.6		$	959.2		$	864.9
Segment Performance:
Aerospace and Defense	$	69.5		$	58.8		$	106.1		$	97.0
Environmental remediation provision adjustments	(1.0		)	(0.5		)	(2.3		)	(1.1		)
GAAP/Cost Accounting Standards retirement benefits expense difference	(1.2		)	(3.4		)	(2.2		)	(6.9		)
Unusual items	—			1.3			—			1.9
Aerospace and Defense Total	67.3			56.2			101.6			90.9
Real Estate	0.6			0.8			1.2			1.6
Total Segment Performance	$	67.9		$	57.0		$	102.8		$	92.5
Reconciliation of segment performance to income before income taxes:
Segment performance	$	67.9		$	57.0		$	102.8		$	92.5
Interest expense	(8.3		)	(7.8		)	(16.4		)	(15.2		)
Interest income	2.0			0.8			3.6			1.3
Stock-based compensation expense	(5.2		)	(3.4		)	(6.7		)	(10.2		)
Corporate retirement benefits expense	(3.3		)	(5.0		)	(6.6		)	(10.0		)
Corporate and other expense, net	(5.8		)	(5.4		)	(10.7		)	(12.0		)
Unusual items	—			—			—			(1.0		)
Income before income taxes	$	47.3		$	36.2		$	66.0		$	45.4

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 June 30,				Six months ended June 30,
	2018		2017		2018		2017
Lockheed Martin Corporation	29	%	24	%	29	%	21	%
United Launch Alliance	19		23		19		23
NASA	19		18		18		18
Raytheon Company	15		14		18		16