10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

ý Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended: June 30, 2018

or

¨ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from to 

Commission File Number 1-01520

Aerojet Rocketdyne Holdings, Inc.

(Exact name of registrant as specified in its charter)

Delaware	34-0244000
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
222 N. Pacific Coast Highway, Suite 500 El Segundo, California	90245
(Address of Principal Executive Offices)	(Zip Code)

(310) 252-8100

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	ý	Accelerated filer	¨
Non-accelerated filer	¨ (Do not check if a smaller reporting company)	Smaller reporting company	¨
Emerging growth company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

As of July 24, 2018, there were 75.6 million outstanding shares of our common stock, including unvested common shares, $0.10 par value.

Aerojet Rocketdyne Holdings, Inc.

Quarterly Report on Form 10-Q

For the Quarterly Period Ended June 30, 2018

Table of Contents

Item Number		Page
PART I — FINANCIAL INFORMATION
1	Financial Statements	1
2	Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
3	Quantitative and Qualitative Disclosures About Market Risk	43
4	Controls and Procedures	44
PART II — OTHER INFORMATION
1	Legal Proceedings	45
1A	Risk Factors	45
2	Unregistered Sales of Equity Securities and Use of Proceeds	45
3	Defaults Upon Senior Securities	45
4	Mine Safety Disclosures	45
5	Other Information	45
6	Exhibits	46
SIGNATURES
	Signatures	47

Part I — FINANCIAL INFORMATION

Item 1. Financial Statements

Aerojet Rocketdyne Holdings, Inc.

Condensed Consolidated Statements of Operations

(Unaudited)

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
	(In millions, except per share amounts)
Net sales	$	467.2		$	459.6		$	959.2		$	864.9
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	369.5			370.6			796.3			710.0
Selling, general and administrative expense	11.1			9.7			17.8			23.2
Depreciation and amortization	17.7			19.1			35.4			35.4
Other expense (income), net	0.9			(1.3		)	2.1			0.4
Total operating costs and expenses	399.2			398.1			851.6			769.0
Operating income	68.0			61.5			107.6			95.9
Non-operating (income) expense:
Retirement benefits expense	14.4			18.3			28.8			36.6
Interest income	(2.0		)	(0.8		)	(3.6		)	(1.3		)
Interest expense	8.3			7.8			16.4			15.2
Total non-operating expense, net	20.7			25.3			41.6			50.5
Income before income taxes	47.3			36.2			66.0			45.4
Income tax provision	12.5			11.9			17.2			15.2
Net income	$	34.8		$	24.3		$	48.8		$	30.2
Earnings Per Share of Common Stock
Basic
Basic net income per share	$	0.46		$	0.32		$	0.65		$	0.41
Diluted
Diluted net income per share	$	0.45		$	0.32		$	0.64		$	0.41
Weighted average shares of common stock outstanding, basic	73.9			73.2			73.8			72.6
Weighted average shares of common stock outstanding, diluted	75.1			73.2			75.0			72.7

See Notes to Unaudited Condensed Consolidated Financial Statements.

1

Aerojet Rocketdyne Holdings, Inc.

Condensed Consolidated Statements of Comprehensive Income

(Unaudited)

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(In millions)
Net income	$	34.8	$	24.3	$	48.8	$	30.2
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes of $4.2 million, $6.2 million, $8.4 million, and $12.4 million	12.5		9.4		25.0		19.1
Comprehensive income	$	47.3	$	33.7	$	73.8	$	49.3

See Notes to Unaudited Condensed Consolidated Financial Statements.

2

Aerojet Rocketdyne Holdings, Inc.

Condensed Consolidated Balance Sheets

(Unaudited)

	June 30, 2018			December 31, 2017
	(In millions, except per share amounts)
ASSETS
Current Assets
Cash and cash equivalents	$	514.7		$	535.0
Marketable securities	44.9			20.0
Accounts receivable	134.6			64.5
Contract assets	253.1			268.1
Other current assets, net	123.2			129.1
Total Current Assets	1,070.5			1,016.7
Noncurrent Assets
Property, plant and equipment, net	357.8			359.0
Recoverable environmental remediation costs	225.8			231.1
Deferred income taxes	255.5			145.8
Goodwill	161.3			161.3
Intangible assets	78.7			85.5
Other noncurrent assets, net	260.5			259.3
Total Noncurrent Assets	1,339.6			1,242.0
Total Assets	$	2,410.1		$	2,258.7
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt	$	30.4		$	25.0
Accounts payable	104.1			100.9
Reserves for environmental remediation costs	34.6			35.2
Contract liabilities	185.3			276.8
Other current liabilities	313.0			156.9
Total Current Liabilities	667.4			594.8
Noncurrent Liabilities
Long-term debt	581.0			591.4
Reserves for environmental remediation costs	299.1			306.2
Pension benefits	467.8			492.8
Other noncurrent liabilities	174.7			171.1
Total Noncurrent Liabilities	1,522.6			1,561.5
Total Liabilities	2,190.0			2,156.3
Commitments and contingencies (Note 8)
Stockholders’ Equity
Preference stock, par value of $1.00; 15.0 million shares authorized; none issued or outstanding	—			—
Common stock, par value of $0.10; 150.0 million shares authorized; 73.9 million shares issued and outstanding as of June 30, 2018; 73.6 million shares issued and outstanding as of December 31, 2017	7.4			7.4
Other capital	509.4			503.1
Treasury stock at cost, 3.5 million shares as of June 30, 2018 and December 31, 2017	(64.5		)	(64.5		)
Retained earnings (accumulated deficit)	15.4			(71.0		)
Accumulated other comprehensive loss, net of income taxes	(247.6		)	(272.6		)
Total Stockholders’ Equity	220.1			102.4
Total Liabilities and Stockholders’ Equity	$	2,410.1		$	2,258.7

See Notes to Unaudited Condensed Consolidated Financial Statements.

3

Aerojet Rocketdyne Holdings, Inc.

Condensed Consolidated Statement of Stockholders’ Equity

(Unaudited)

	Common Stock										(Accumulated Deficit)			Accumulated Other			Total
	Shares		Amount		Other Capital			Treasury Stock			Retained Earnings			Comprehensive Loss			Stockholders' Equity
	(In millions)
December 31, 2017	73.6		$	7.4	$	503.1		$	(64.5	)	$	(71.0	)	$	(272.6	)	$	102.4
Net income	—		—		—			—			48.8			—			48.8
Amortization of actuarial losses and prior service credits, net of income taxes	—		—		—			—			—			25.0			25.0
Cumulative effect of change in accounting guidance (see Note 13)	—				—			—			37.6			—			37.6
Repurchase of shares for withholding taxes and option costs under employee equity plans	(0.1	)	—		(2.1		)	—			—			—			(2.1		)
Stock-based compensation and shares issued under equity plans	0.4		—		8.4			—			—			—			8.4
June 30, 2018	73.9		$	7.4	$	509.4		$	(64.5	)	$	15.4		$	(247.6	)	$	220.1

See Notes to Unaudited Condensed Consolidated Financial Statements.

4

Aerojet Rocketdyne Holdings, Inc.

Condensed Consolidated Statements of Cash Flows

(Unaudited)

	Six months ended June 30,
	2018			2017
	(In millions)
Operating Activities
Net income	$	48.8		$	30.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35.4			35.4
Amortization of debt discount and deferred financing costs	4.4			4.2
Stock-based compensation	6.7			10.2
Retirement benefits, net	6.7			15.4
Insurance proceeds	(1.9		)	—
Other, net	(0.1		)	0.3
Changes in assets and liabilities, net of effects from acquisition in 2017:
Accounts receivable	(40.7		)	(50.3		)
Contract assets	(7.5		)	(9.7		)
Other current assets, net	16.3			12.2
Recoverable environmental remediation costs	5.3			10.1
Other noncurrent assets	(1.5		)	(31.5		)
Accounts payable	(9.7		)	12.6
Contract liabilities	(58.1		)	(43.0		)
Other current liabilities	21.8			13.6
Deferred income taxes	2.3			15.9
Reserves for environmental remediation costs	(7.7		)	(10.8		)
Other noncurrent liabilities and other	4.0			22.9
Net Cash Provided by Operating Activities	24.5			37.7
Investing Activities
Purchases of marketable securities	(44.7		)	—
Sales of marketable securities	20.1			—
Purchase of Coleman Aerospace	—			(15.0		)
Insurance proceeds	1.9			—
Capital expenditures	(12.2		)	(6.1		)
Net Cash Used in Investing Activities	(34.9		)	(21.1		)
Financing Activities
Debt repayments	(10.3		)	(10.0		)
Repurchase of shares for withholding taxes and option costs under employee equity plans	(2.1		)	(5.7		)
Proceeds from shares issued under equity plans	2.5			2.4
Net Cash Used in Financing Activities	(9.9		)	(13.3		)
Net (Decrease) Increase in Cash and Cash Equivalents	(20.3		)	3.3
Cash and Cash Equivalents at Beginning of Period	535.0			410.3
Cash and Cash Equivalents at End of Period	$	514.7		$	413.6
Supplemental disclosures of cash flow information
Cash paid for interest	$	11.9		$	11.4
Cash paid for income taxes	15.2			0.5
Cash refund for income taxes	4.6			21.3
Conversion of debt to common stock	—			35.6
Non-cash fixed asset additions and capital leases	14.2			0.2

See Notes to Unaudited Condensed Consolidated Financial Statements.

5

Aerojet Rocketdyne Holdings, Inc.

Notes to Unaudited Condensed Consolidated Financial Statements

Note 1. Basis of Presentation and Nature of Operations

Aerojet Rocketdyne Holdings, Inc. (“Aerojet Rocketdyne Holdings” or the “Company”) has prepared the accompanying unaudited condensed consolidated financial statements, including its accounts and the accounts of its wholly-owned subsidiaries, in accordance with the instructions to Form 10-Q. The December 31, 2017, condensed consolidated balance sheet was derived from audited financial statements, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). These interim financial statements should be read in conjunction with the financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017. Certain reclassifications have been made to financial information for the prior year to conform to the current year’s presentation (see “Recently Adopted Accounting Pronouncements” below and Note 13).

The Company believes the accompanying unaudited condensed consolidated financial statements reflect all adjustments, including normal recurring accruals, necessary for a fair statement of its financial position, results of operations, and cash flows for the periods presented. All significant intercompany balances and transactions have been eliminated in consolidation. The preparation of the unaudited condensed consolidated financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the amounts reported in the unaudited condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates. In addition, the operating results for interim periods may not be indicative of the results of operations for a full year.

The Company’s operations are organized into two segments:

Aerospace and Defense — includes the operations of the Company’s wholly-owned subsidiary Aerojet Rocketdyne, Inc. (“Aerojet Rocketdyne”), a leading technology-based designer, developer and manufacturer of aerospace and defense products and systems for the United States (“U.S.”) government, including the Department of Defense (“DoD”), the National Aeronautics and Space Administration (“NASA”), and major aerospace and defense prime contractors.

Real Estate — includes the activities of the Company’s wholly-owned subsidiary Easton Development Company, LLC (“Easton”) related to the re-zoning, entitlement, sale, and leasing of the Company’s excess real estate assets. The Company is currently in the process of seeking zoning changes and other governmental approvals on its excess real estate assets to optimize their value.

A detailed description of the Company’s significant accounting policies can be found in the Company’s most recent Annual Report on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017.

AR1 Research and Development

Company-sponsored research and development (“R&D”) expenses (reported as a component of cost of sales) are generally reimbursed via allocation of such expenses among all contracts and programs in progress under U.S. government contractual arrangements. The Company's newest large liquid booster engine development project, the AR1, accounted for $56.1 million of such reimbursable costs from its inception through June 30, 2018. In February 2016, pursuant to an Other Transaction Agreement (“OTA”), the U.S. Air Force selected Aerojet Rocketdyne and United Launch Alliance (“ULA”) to share in a public-private partnership to develop jointly the AR1 engine under an agreement valued at $804.0 million with the U.S. Air Force investing two-thirds of the funding required to complete development of the AR1 engine by December 2019. In June 2018, the Company and the U.S. Air Force signed a modification to the existing OTA to modify the scope, funding, cost share, and period of performance of the AR1 engine. The modified OTA is valued at $353.8 million with the U.S. Air Force investing five-sixths of the funding required to design, build, and assemble a single AR1 engine prototype by December 2019. The U.S. Air Force contributions are recognized proportionately as an offset to R&D expenses. The AR1 inception to date, beginning in 2015, project costs at June 30, 2018, were as follows (in millions):

AR1 R&D costs incurred	$	290.1
Less amounts funded by the U.S. Air Force	(192.3		)
Less amounts funded by ULA	(9.6		)
AR1 R&D costs net of reimbursements	$	88.2

Of the $88.2 million AR1 investment, $32.1 million was expensed and $56.1 million was applied to the Company's contracts. The $6.7 million applied to the Company’s contracts in the three months ended March 31, 2018, was adjusted as a result of the modification discussed above such that no costs have been applied to the Company's contracts during the six months ended June 30, 2018. The Company’s cash contributions to this OTA are now complete.

6

Recently Adopted Accounting Pronouncements

In March 2016, the Financial Accounting Standards Board (“FASB”) amended the existing accounting guidance related to stock compensation. The amendment requires all income tax effects of awards to be recognized in the income statement when awards vest and allows a choice to account for forfeitures on an estimated or actual basis. There is also a requirement to present excess income tax benefits as an operating activity on the statement of cash flows. Effective January 1, 2017, the Company adopted the amendment requiring recognition of excess tax benefits and tax deficiencies in the income statement prospectively. In addition, the Company elected to change its accounting policy to account for forfeitures when they occur for consistency with the U.S. government recovery accounting practices on a modified retrospective basis. The Company also elected to adopt the amendment related to the presentation of excess tax benefits within operating activities on the statement of cash flows, retrospectively.

In January 2017, the FASB issued an amendment to the accounting guidance related to goodwill impairment. The update eliminates “Step 2” which involves determining the implied fair value of goodwill and comparing it to the carrying amount of goodwill to measure the goodwill impairment loss, if any. The quantitative assessment “Step 1” will be used to determine both the existence and amount of goodwill impairment. The standard should be applied on a prospective basis and is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted this new accounting guidance in conjunction with its annual impairment test on October 1, 2017. The adoption did not have an impact on the Company's financial position, results of operations, or cash flows.

In August 2016, the FASB issued an amendment to the accounting guidance related to classification of certain cash receipts and cash payments in the statement of cash flows. The standard provides guidance for eight targeted changes with respect to how cash receipts and cash payments are classified in the statement of cash flows, with the objective of reducing diversity in practice. The Company adopted this new accounting guidance on December 31, 2017. The adoption did not have an impact on the Company's financial position, results of operations, or cash flows.

In November 2016, the FASB issued an amendment to the accounting guidance for the presentation of restricted cash in the statement of cash flows. The new guidance requires that the statement of cash flows explain the difference during the period in total cash, cash equivalents, and restricted cash. Also, when cash, cash equivalents, and restricted cash are presented on more than one line item within the statement of financial position, a reconciliation of those line items to the total cash, cash equivalents, and restricted cash presented on the statement of cash flows must be disclosed. The Company adopted this new accounting guidance on December 31, 2017. The adoption did not have an impact on the Company's financial position, results of operations, or cash flows.

On December 22, 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed in reasonable detail to complete the accounting for certain income tax effects of the Tax Cuts and Jobs Act (“Tax Act”). In accordance with SAB 118, the Company recorded $64.6 million of deferred tax expense in connection with the remeasurement of certain deferred tax assets and liabilities in the three months ended December 31, 2017. As of June 30, 2018, and consistent with the disclosure in the Company’s 2017 Form 10-K, as amended by Form 10-K/A, Note 1, Recently Adopted Accounting Pronouncements, the accounting for the Tax Act is incomplete. The Company was able to reasonably estimate certain effects, and consequently recorded provisional adjustments associated with the impact on deferred tax assets and deferred tax liabilities resulting from the reduction of the U.S. federal corporate income tax rate at December 31, 2017. The Company has made no changes to these items during the six months ended June 30, 2018, and continues to evaluate the impacts of the Tax Act, including ongoing guidance and accounting interpretation.

In May 2014, the FASB amended the existing accounting standards for revenue recognition. The amendments are based on the principle that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company adopted the guidance effective January 1, 2018, using the modified retrospective method, with the cumulative effect recognized as of January 1, 2018. All applicable amounts and disclosures for the three and six months ended June 30, 2018, reflect the impact of adoption. As the Company elected to use the modified retrospective method, prior periods presented have not been restated to reflect the impact of adoption unless otherwise noted (see Notes 3 and 13).

In March 2017, the FASB amended the existing accounting guidance relating to the presentation of net periodic pension cost and net periodic postretirement benefit cost (the “NPPC”) in the income statement.  The amended guidance requires the service cost component to be presented in the same line item or items as other compensation arising from the services rendered by the pertinent employees during the period, and other components of the NPPC to be presented in the statement of operations separately from service cost components and outside a subtotal of income from operations. The Company adopted the guidance effective January 1, 2018. The adoption resulted in an increase in operating income of $36.6 million for the six months ended June 30, 2017, and a corresponding increase in total non-operating expense, net for the period. The adoption did not impact segment performance, net income, or cash flows.

7

Recently Issued Accounting Pronouncements

In February 2016, the FASB issued guidance requiring lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. For lessees, leases will continue to be classified as either operating or finance leases in the income statement. Lessor accounting is similar to the current model but updated to align with certain changes to the lessee model. Lessors will continue to classify leases as operating, direct financing or sales-type leases. The effective date of the new standard is for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition method and requires application of the new guidance at the beginning of the earliest comparative period presented. The Company is evaluating the impact of adopting this new accounting guidance on its financial position, results of operations, or cash flows.

In February 2018, the FASB issued guidance that permits the reclassification of the income tax effects of the 2017 Tax Act on items within accumulated other comprehensive loss to retained earnings. The guidance refers to these amounts as “stranded tax effects.” The amended guidance also requires certain new disclosures. The new guidance is effective for financial statements issued for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is evaluating the impact of adopting this new accounting guidance on its financial position, results of operations, or cash flows.

Note 2. Income Per Share of Common Stock

A reconciliation of the numerator and denominator used to calculate basic and diluted income per share of common stock (“EPS”) is presented in the following table:

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
	(In millions, except per share amounts)
Numerator:
Net income	$	34.8		$	24.3		$	48.8		$	30.2
Income allocated to participating securities	(0.8		)	(0.5		)	(1.0		)	(0.7		)
Net income for basic EPS	34.0			23.8			47.8			29.5
Interest on 4 1/16% Convertible Subordinated Debentures (“4 1/16% Debentures”)	—			—			—			0.1
Net income for diluted EPS	$	34.0		$	23.8		$	47.8		$	29.6
Denominator:
Basic weighted average shares	73.9			73.2			73.8			72.6
Effect of:
4 1/16% Debentures	—			—			—			0.1
2.25% Convertible Senior Notes (“2 1/4% Notes”) (1)	1.1			—			1.1			—
Employee stock options and stock purchase plan (2)	0.1			—			0.1			—
Diluted weighted average shares	75.1			73.2			75.0			72.7
Basic
Basic EPS	$	0.46		$	0.32		$	0.65		$	0.41
Diluted
Diluted EPS	$	0.45		$	0.32		$	0.64		$	0.41

_______

(1) The Company's 2 ¹/₄% Notes were not included in the computation of diluted EPS for the three and six months ended June 30, 2017, because the average market price of the common stock did not exceed the conversion price and the Company only expects the conversion premium for the 2 ¹/₄% Notes to be settled in common shares.

(2) There was less than 0.1 million of common share dilution impact from employee stock options and the stock purchase plan for the three and six months ended June 30, 2017.

8

Note 3. Revenue Recognition

In the Company’s Aerospace and Defense segment, the majority of the Company’s revenue is earned from long-term contracts to design, develop, and manufacture aerospace and defense products, and provide related services, for the Company’s customers, including the U.S. government, major aerospace and defense prime contractors, and a portion of the commercial sector. Each customer contract defines the Company’s distinct performance obligations and the associated transaction price for each obligation. A contract may contain a single or multiple performance obligations. In certain circumstances, multiple contracts with a customer are required to be combined in determining the distinct performance obligations. For contracts with multiple performance obligations, the Company allocates the contracted transaction price to each performance obligation based upon the relative standalone selling price, which represents the price the Company would sell the promised good or service separately to the customer. The Company determines the standalone selling price based upon the facts and circumstances of each obligated good or service. The majority of the Company’s contracts have no observable standalone selling price since the associated products and service are customized to customer specifications. As such, the standalone selling price generally reflects the Company’s forecast of the total cost to satisfy the performance obligation plus an appropriate profit margin.

Contract modifications are routine in the performance of the Company's long-term contracts. Contracts are often modified to account for changes in contract specifications or requirements. In most instances, contract modifications are for goods or services that are not distinct, and, therefore, are accounted for as part of the existing contract.

The Company recognizes revenue as each performance obligation is satisfied. The majority of the Company’s aerospace and defense performance obligations are satisfied over time either as the service is provided, or as control transfers to the customer. Transfer of control is evidenced by the Company’s contractual right to payment for work performed to date plus a reasonable profit on highly customized products. The Company measures progress on substantially all its performance obligations using the cost-to-cost method, which the Company believes best depicts the transfer of control of goods and services to the customer. Under the cost-to-cost method, the Company records revenues based upon costs incurred to date relative to the total estimated cost at completion. Contract costs include labor, material, overhead, and general and administrative expenses, as appropriate.  

Recognition of revenue and profit on long-term contracts requires the use of assumptions and estimates related to the total contract value, the total cost at completion, and the measurement of progress towards completion for each performance obligation. Due to the nature of the programs, developing the estimated total contract value and total cost at completion for each performance obligation requires the use of significant judgment.

The contract value of long-term contracts may include variable consideration, such as incentives, awards, or penalties. The value of variable consideration is generally determined by contracted performance metrics, which may include targets for cost, performance, quality, and schedule. The Company includes variable consideration in the transaction price for the respective performance obligation at either estimated value, or most likely amount to be earned, based upon the Company’s assessment of expected performance. The Company records these amounts only to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved.

The Company evaluates the contract value and cost estimates for performance obligations at least quarterly and more frequently when circumstances significantly change. Factors considered in estimating the work to be completed include, but are not limited to: labor productivity, the nature and technical complexity of the work to be performed, availability and cost volatility of materials, subcontractor and vendor performance, warranty costs, volume assumptions, anticipated labor agreements, inflationary trends, schedule and performance delays, availability of funding from the customer, and the recoverability of costs incurred outside the original contract included in any estimates to complete. When the Company’s estimate of total costs to be incurred to satisfy a performance obligation exceeds the expected revenue, the Company recognizes the loss immediately. When the Company determines that a change in estimates has an impact on the associated profit of a performance obligation, the Company records the cumulative positive or negative adjustment to the statement of operations. Changes in estimates and assumptions related to the status of certain long-term contracts may have a material effect on the Company’s operating results. The following table summarizes the impact of the changes in significant contract accounting estimates on the Company’s Aerospace and Defense segment operating results:

9

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(In millions, except per share amounts)
Net favorable effect of the changes in contract estimates on net sales	$	26.2	$	9.6	$	18.8	$	13.5
Net favorable effect of the changes in contract estimates on income before income taxes	22.0		10.3		14.1		13.7
Net favorable effect of the changes in contract estimates on net income	16.3		6.2		10.4		8.2
Net favorable effect of the changes in contract estimates on basic net income per share	0.22		0.08		0.14		0.11
Net favorable effect of the changes in contract estimates on diluted net income per share	0.21		0.08		0.14		0.11

The three and six months ended June 30, 2018, net favorable changes in contract estimates on income before income taxes were primarily driven by risk retirements on the Terminal High Altitude Area Defense (“THAAD”), RS-68, RS-25, and RL-10 programs and better than expected overhead rate performance, partially offset by cost growth and performance issues on the Commercial Crew Development program.

In the Company’s Aerospace and Defense segment, the timing of revenue recognition, customer invoicing, and collections produces accounts receivable, contract assets, and contract liabilities on the Company’s Consolidated Balance Sheet. The Company invoices in accordance with contract payment terms either based upon a recurring contract payment schedule, or as contract milestones are achieved. Customer invoices, net of reserves, represent an unconditional right of consideration. When revenue is recognized in advance of customer invoicing a contract asset is recorded. Conversely, when customers are invoiced in advance of revenue recognition, a contract liability is recorded. Unpaid customer invoices are reflected as accounts receivable. A summary of the contract assets and liabilities is as follows:

	June 30, 2018			December 31, 2017
	(In millions)
Contract assets	$	296.3		$	310.9
Reserve for overhead rate disallowance	(43.2		)	(42.8		)
Contract assets, net of reserve	253.1			268.1
Contract liabilities	185.3			276.8
Net contract assets (liabilities), net of reserve	$	67.8		$	(8.7	)

Net contract assets (liabilities) increased by $76.5 million, primarily due to a decrease in cash advances on long-term contracts as of June 30, 2018. During the three and six months ended June 30, 2018, the Company recognized sales of $68.0 million and $200.5 million, respectively,that were included in the Company’s contract liabilities as of January 1, 2018.

As of June 30, 2018, the Company’s total remaining performance obligations, also referred to as backlog, totaled $3.9 billion. The Company expects to recognize approximately 48%, or $1.9 billion, of the remaining performance obligations as sales over the next twelve months, an additional 28% the following twelve months, and 24% thereafter.

The Company's contracts are largely categorized as either “fixed-price” (largely used by the U.S. government for production-type contracts) or “cost-reimbursable” (largely used by the U.S. government for development-type contracts). Fixed-price contracts present the risk of unreimbursed cost overruns, potentially resulting in lower than expected contract profits and margins. This risk is generally lower for cost-reimbursable contracts which, as a result, generally have a lower margin. The following are percentages of net sales by contract type:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Fixed-price	58	%	58	%	59	%	57	%
Cost-reimbursable	39		37		38		39
Other	3		5		3		4

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The following are percentages of net sales by customer type:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018			2017
U.S. government	93	%	93	%	93	%		93	%
Non U.S. government customers	7		7		7		7	7

The Company's Real Estate segment represented less than 1% of the Company's net sales for the three and six months ended June 30, 2018 and 2017.

Note 4. Stock-Based Compensation

Total stock-based compensation expense by type of award was as follows:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(In millions)
Stock appreciation rights	$	1.4	$	—	$	0.5	$	2.4
Stock options	—		0.3		0.1		0.7
Restricted shares, service based	1.2		1.2		2.2		2.4
Restricted shares, performance based	2.5		1.8		3.6		4.4
Employee stock purchase plan	0.1		0.1		0.3		0.3
Total stock-based compensation expense	$	5.2	$	3.4	$	6.7	$	10.2

Note 5. Balance Sheet Accounts

a. Fair Value of Financial Instruments

The accounting standards use a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. The following are measured at fair value:

			Fair value measurement at June 30, 2018
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Money market funds	$	198.5	$	198.5	$	—	$	—
Commercial paper	119.8		—		119.8		—
	$	318.3	$	198.5	$	119.8	$	—
			Fair value measurement at December 31, 2017
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Money market funds	$	155.0	$	155.0	$	—	$	—
Commercial paper	135.6		—		135.6		—
U.S. treasury notes	4.1		—		4.1		—
	$	294.7	$	155.0	$	139.7	$	—

As of June 30, 2018, of the total estimated fair value for commercial paper, $74.9 million was classified as cash and cash equivalents as the remaining maturity at date of purchase was less than three months, and $44.9 million was classified as marketable securities. As of December 31, 2017, of the total estimated fair value for commercial paper and U.S. treasury notes, $119.7 million was classified as cash and cash equivalents as the remaining maturity at date of purchase was less than three

11

months, and $20.0 million was classified as marketable securities. As of June 30, 2018, and December 31, 2017, the contractual maturities of the Company’s available-for-sale marketable securities were less than one year.

The carrying amounts of certain of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, accrued compensation, and other accrued liabilities, approximate fair value because of their short maturities.

The following table summarizes the estimated fair value and principal amount for outstanding debt obligations:

	Fair Value				Principal Amount
	June 30, 2018		December 31, 2017		June 30, 2018		December 31, 2017
	(In millions)
Term loan	$	360.0	$	370.0	$	360.0	$	370.0
2 1/4% Notes	388.9		415.3		300.0		300.0
Capital leases	1.8		0.9		1.8		0.9
	$	750.7	$	786.2	$	661.8	$	670.9

The fair value of the 2 ¹/₄% Notes was determined using broker quotes that are based on open markets for the Company’s debt securities (Level 2 securities). The term loan bore interest at variable rates, which adjusted based on market conditions, and its carrying value approximated fair value.

b. Accounts Receivable

	June 30, 2018		December 31, 2017
	(In millions)
Billed receivables under long-term contracts	$	133.6	$	63.8
Other receivables	1.0		0.7
Accounts receivable	$	134.6	$	64.5

The Company made certain reclassifications to the December 31, 2017, balance sheet to conform to the current year’s presentation as a result of adopting the new revenue recognition guidance effective January 1, 2018. Accordingly, the Company reclassified $151.0 million of unbilled receivables, net of reserves for disallowances, to contract assets as of December 31, 2017 (see Notes 3 and 13).

c. Other Current Assets, net

	June 30, 2018		December 31, 2017
	(In millions)
Deferred costs recoverable from the U.S. government	$	45.3	$	51.4
Inventories	18.9		19.3
Receivable from Northrop Grumman Corporation (“Northrop”) for environmental remediation costs	6.0		6.0
Prepaid expenses	16.5		19.2
Cost-share and other receivables, net	7.1		7.5
Income taxes receivable	20.5		20.5
Other	8.9		5.2
Other current assets, net	$	123.2	$	129.1

The Company made certain reclassifications to the December 31, 2017, balance sheet to conform to the current year’s presentation as a result of adopting the new revenue recognition guidance effective January 1, 2018. Accordingly, the Company reclassified $117.1 million of inventories to contract assets as of December 31, 2017 (see Notes 3 and 13).

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d. Property, Plant and Equipment, net

	June 30, 2018			December 31, 2017
	(In millions)
Land	$	71.2		$	71.2
Buildings and improvements	377.4			368.3
Machinery and equipment	492.5			493.2
Construction-in-progress	38.4			30.3
	979.5			963.0
Less: accumulated depreciation	(621.7		)	(604.0		)
Property, plant and equipment, net	$	357.8		$	359.0

e. Other Noncurrent Assets, net

	June 30, 2018		December 31, 2017
	(In millions)
Real estate held for entitlement and leasing	$	94.9	$	94.0
Receivable from Northrop for environmental remediation costs	55.5		58.5
Deferred costs recoverable from the U.S. government	67.6		66.6
Grantor trusts	22.8		24.2
Notes receivable, net	9.0		9.0
Other	10.7		7.0
Other noncurrent assets, net	$	260.5	$	259.3

f. Other Current Liabilities

	June 30, 2018		December 31, 2017
	(In millions)
Accrued compensation and employee benefits	$	104.2	$	113.4
Competitive improvement program obligations	14.6		15.0
Income taxes payable	136.4		0.8
Postretirement medical and life insurance benefits	4.8		4.8
Other program liabilities	33.2		6.6
Other	19.8		16.3
Other current liabilities	$	313.0	$	156.9

The Company made certain reclassifications to the December 31, 2017, balance sheet to conform to the current year’s presentation as a result of adopting the new revenue recognition guidance effective January 1, 2018. Accordingly, the Company reclassified $39.0 million of other current liabilities to contract liabilities as of December 31, 2017 (see Notes 3 and 13).

The significant increase in the current income tax payable during this reporting period relates to the impact of the Company’s adoption of the new revenue recognition guidance on January 1, 2018. In anticipation of this impact, the Company filed a non-automatic accounting method change request, Form 3115 Application for Change in Accounting Method, with the Internal Revenue Service (“IRS”) during the three months ended March 31, 2018. The change in accounting method for tax purposes will provide for consistent recognition of costs of sales for both book and tax purposes, under certain circumstances. To the extent that the Company receives IRS consent, the Company expects that the current income tax payable and the corresponding deferred tax asset would decrease by approximately $105 million to $115 million.

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g. Other Noncurrent Liabilities

	June 30, 2018		December 31, 2017
	(In millions)
Conditional asset retirement obligations	$	44.9	$	44.0
Pension benefits, non-qualified	17.2		17.6
Deferred compensation	29.3		29.4
Deferred revenue	12.4		12.7
Postretirement medical and life insurance benefits	31.4		32.7
Competitive improvement program obligations	13.7		18.4
Uncertain income tax positions	4.9		2.8
Other	20.9		13.5
Other noncurrent liabilities	$	174.7	$	171.1

Note 6. Income Taxes

	Six months ended June 30,
	2018		2017
	(In millions)
Income tax provision	$	17.2	$	15.2

In the six months ended June 30, 2018, the income tax provision was $17.2 million for an effective tax rate of 26.1%. The Company’s effective tax rate differed from the 21% statutory federal income tax rate primarily due to state income taxes and certain expenditures which are permanently not deductible for tax purposes, partially offset by the impact of R&D credits.

In the six months ended June 30, 2017, the income tax provision was $15.2 million for an effective tax rate of 33.5%. The Company’s effective tax rate differed from the 35% statutory federal income tax rate primarily due to state income taxes and certain expenditures which are permanently not deductible for tax purposes, offset by the impact of R&D credits, tax benefits attributable to the expiration of statute of limitations, and excess tax benefits from the exercise and vesting of stock-based compensation.

See a discussion of the significant increase in the income tax payable balance in Note 5(f).

A valuation allowance is required when it is more-likely-than-not that all or a portion of deferred tax assets may not be realized. Assessing the need for a valuation allowance requires management to evaluate, on a quarterly basis, all available evidence, both positive and negative. As of June 30, 2018, the Company continues to believe that the weight of the positive evidence outweighed the negative evidence regarding the realization of its net deferred tax assets.

In the three months ended June 30, 2018, the Internal Revenue Service notified the Company that its federal income tax return for the fiscal year ended November 30, 2015, was selected for audit. The Company is unable to determine the outcome of the audit at this time.

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Note 7. Long-term Debt

	June 30, 2018			December 31, 2017
	(In millions)
Term loan, bearing interest at variable rates (rate of 4.34% as of June 30, 2018), maturing in June 2021	$	360.0		$	370.0
Unamortized deferred financing costs	(1.4		)	(1.7		)
Total senior debt	358.6			368.3
Senior convertible notes, bearing interest at 2.25% per annum, interest payments due in June and December, maturing in December 2023	300.0			300.0
Unamortized discount and deferred financing costs	(49.0		)	(52.8		)
Total convertible senior notes	251.0			247.2
Capital lease, payable in monthly installments, maturing in 2022	1.8			0.9
Total other debt	1.8			0.9
Total debt, net of unamortized discount and deferred financing costs	611.4			616.4
Less: Amounts due within one year	(30.4		)	(25.0		)
Total long-term debt, net of unamortized discount and deferred financing costs	$	581.0		$	591.4

Senior Credit Facility

On June 17, 2016, the Company entered into a $750.0 million senior secured senior credit facility (the “Senior Credit Facility”).  The Senior Credit Facility matures on June 17, 2021, and consists of (i) a $350.0 million revolving line of credit (the “Revolver”) and (ii) a $400.0 million term loan (the “Term Loan”).  Under the Revolver, up to an aggregate of $100.0 million is available for the issuance of letters of credit and up to an aggregate of $10.0 million is available for swingline loans.  As of June 30, 2018, the Company had $360.0 million outstanding under the Term Loan, zero borrowings under the Revolver, and had issued $38.4 million letters of credit.  

The key financial covenants are as follows:

Financial Covenant	Actual Ratios as of June 30, 2018	Required Ratios
Consolidated Interest Coverage Ratio, as defined under the Senior Credit Facility	11.75 to 1.00	Not less than: 3.00 to 1.00
Consolidated Net Leverage Ratio, as defined under the Senior Credit Facility	2.42 to 1.00	Not greater than: 3.75 to 1.00

The Company was in compliance with its financial and non-financial covenants under the Senior Credit Facility as of June 30, 2018.

2¼% Convertible Senior Notes

The Company issued $300.0 million aggregate principal amount of 2¼% Notes in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended.

The Company separately accounted for the liability and equity components of the 2¼% Notes. The initial liability component of the 2¼% Notes was valued based on the present value of the future cash flows using an estimated borrowing rate at the date of the issuance for similar debt instruments without the conversion feature, which equals the effective interest rate of 5.8% on the liability component. The equity component, or debt discount, was initially valued equal to the principal value of the 2¼% Notes, less the liability component. The debt discount is being amortized as a non-cash charge to interest expense over the period from the issuance date through December 15, 2023.

The debt issuance costs of $5.8 million incurred in connection with the issuance of the 2¼% Notes were capitalized and bifurcated into deferred financing costs of $4.7 million and equity issuance costs of $1.1 million. The deferred financing costs are being amortized to interest expense from the issuance date through December 15, 2023.

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The 2¼% Notes consisted of the following (in millions, except years, percentages, conversion rate, and conversion price):

	June 30, 2018			December 31, 2017
Carrying value, long-term	$	251.0		$	247.2
Unamortized discount and deferred financing costs	49.0			52.8
Principal amount	$	300.0		$	300.0
Carrying amount of equity component, net of equity issuance costs	$	54.5		$	54.5
Remaining amortization period (years)	5.5			6.0
Effective interest rate	5.8		%	5.8		%
Conversion rate (shares of common stock per $1,000 principal amount)	38.4615			38.4615
Conversion price (per share of common stock)	$	26.00		$	26.00

Based on the Company's closing stock price of $29.49 on June 30, 2018, the if-converted value of the 2¼% Notes exceeded the aggregate principal amount of the 2¼% Notes by $40.3 million. The Company only expects the conversion premium for the 2 ¹/₄% Notes to be settled in common shares.

The following table presents the interest expense components for the 2¼% Notes:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(In millions)
Interest expense-contractual interest	$	1.7	$	1.7	$	3.4	$	3.4
Interest expense-amortization of debt discount	1.8		1.7		3.5		3.3
Interest expense-amortization of deferred financing costs	0.2		0.2		0.3		0.3

Capital Leases

As of June 30, 2018, and December 31, 2017, the Company had capital lease obligations for certain information technology equipment.

In September 2017, the Company entered into an agreement to lease 122,000-square feet of office space in Huntsville, Alabama. The term of the lease is twenty years and commenced in July 2018 resulting in an estimated remaining financial commitment of $47.8 million representing a present value of $24.9 million as of June 30, 2018.

In October 2017, the Company entered into an agreement to lease a new 136,000-square-foot advanced manufacturing facility located in Huntsville, Alabama. The term of the lease is thirty-one years and is expected to commence in December 2018 resulting in an estimated remaining financial commitment of $34.7 million representing a present value of $21.0 million as of June 30, 2018.

Note 8. Commitments and Contingencies

a. Legal Matters

The Company and its subsidiaries are subject to legal proceedings, including litigation in U.S. federal and state courts, which arise out of, and are incidental to, the ordinary course of the Company’s on-going and historical businesses. The Company is also subject from time to time to governmental investigations by federal and state agencies. The Company cannot predict the outcome of such investigations or proceedings with any degree of certainty. Loss contingency provisions are recorded for probable losses at management’s best estimate of a loss, or when a best estimate cannot be made, a minimum loss contingency amount is recorded. These estimates are often initially developed substantially earlier than when the ultimate loss is known, and are refined each quarterly reporting period as additional information becomes available.

Asbestos Litigation

The Company has been, and continues to be, named as a defendant in lawsuits alleging personal injury or death due to exposure to asbestos in building materials, products, or in manufacturing operations. The majority of cases are pending in Texas and Illinois. There were 54 asbestos cases pending as of June 30, 2018.

Given the lack of any significant consistency to claims (i.e., as to product, operational site, or other relevant assertions) filed against the Company, the Company is generally unable to make a reasonable estimate of the future costs of pending claims or unasserted claims. As of June 30, 2018, the Company has accrued an immaterial amount related to pending claims.

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Socorro

On May 12, 2015, a complaint for personal injuries, loss of consortium and punitive damages was filed by James Chavez, Andrew Baca, and their respective spouses, against Aerojet Rocketdyne and the Board of Regents of New Mexico Tech in the Seventh Judicial District, County of Socorro, New Mexico, James Chavez, et al., vs. Aerojet Rocketdyne, Inc., et al., Case No. D725CV201500047. Messrs. Chavez and Baca were employees of Aerotek, a contractor to Aerojet Rocketdyne, who were injured when excess energetic materials being managed by the Energetic Materials Research and Testing Center, a research division of New Mexico Tech, ignited in an unplanned manner. The complaint alleged causes of action based on negligence and negligence per se, strict liability, and willful, reckless and wanton conduct against the defendants including Aerojet Rocketdyne, and sought unspecified compensatory and punitive damages. Aerojet Rocketdyne filed a Motion for Summary Judgment and plaintiff filed a Motion for Partial Summary Judgment. The court denied both parties’ motions and the parties agreed to participate in mediation. A mediator’s proposal was accepted and a formal settlement agreement is being prepared. The Company recorded a liability as of June 30, 2018, for the confidential settlement, the terms of which are not material to the Company’s financial statements.

Department of Justice (“DOJ”) Investigation

The Company responded to a civil investigative demand issued by the DOJ in the three months ended March 31, 2017, requesting information relating to allegations under the False Claims Act that the Company may have previously made false representations to the U.S. government regarding the Company’s compliance with certain regulatory cybersecurity requirements.  In the three months ended June 30, 2018, the DOJ completed its review and declined to intervene in a case filed against the Company and Aerojet Rocketdyne in the U.S. District Court, Eastern District of California, originally filed under seal on September 13, 2017. The case is captioned United States ex. rel. Markus vs. Aerojet Rocketdyne Holdings, Inc. et al., Case No. 2:15-CV-02245-WBS-AC. The complaint alleges causes of action based on false claims, retaliation, and wrongful termination of employment and seeks injunctive relief, civil penalties, and compensatory and punitive damages. The Company is evaluating the complaint and has not recorded any liability for this matter as of June 30, 2018.

b. Environmental Matters

The Company is involved in approximately forty environmental matters under the Comprehensive Environmental Response Compensation and Liability Act, the Resource Conservation Recovery Act, and other federal, state, local, and foreign laws relating to soil and groundwater contamination, hazardous waste management activities, and other environmental matters at some of its current and former facilities. The Company is also involved in a number of remedial activities at third party sites, not owned by the Company, where it is designated a potentially responsible party (“PRP”) by either the U.S. Environmental Protection Agency (“EPA”) and/or a state agency. In many of these matters, the Company is involved with other PRPs. In some instances, the Company’s liability and proportionate share of costs have not been determined largely due to uncertainties as to the nature and extent of site conditions and the Company’s involvement. While government agencies frequently claim PRPs are jointly and severally liable at such sites, in the Company’s experience, interim and final allocations of liability and costs are generally made based on relative contributions of waste or contamination. Anticipated costs associated with environmental remediation that are probable and estimable are accrued. In cases where a date to complete remedial activities at a particular site cannot be determined by reference to agreements or otherwise, the Company projects costs over an appropriate time period not exceeding fifteen years. In such cases, generally the Company does not have the ability to reasonably estimate environmental remediation costs that are beyond this period. Factors that could result in changes to the Company’s estimates include completion of current and future soil and groundwater investigations, new claims, future agency demands, discovery of more or less contamination than expected, discovery of new contaminants, modification of planned remedial actions, changes in estimated time required to remediate, new technologies, and changes in laws and regulations.

As of June 30, 2018, the aggregate range of these anticipated environmental costs was $333.7 million to $493.1 million and the accrued amount was $333.7 million. See Note 8(c) for a summary of the environmental reserve activity. Of these accrued liabilities, approximately 99% relates to the Company’s U.S. government contracting business, and a portion of this liability is recoverable. The significant environmental sites are discussed below. The balance of the accrued liabilities, which are not recoverable from the U.S. government, relate to other sites for which the Company’s obligations are probable and estimable.

Sacramento, California Site

In 1989, a federal district court in California approved a Partial Consent Decree (“PCD”) requiring Aerojet Rocketdyne, among other things, to conduct a Remedial Investigation and Feasibility Study to determine the nature and extent of impacts due to the release of chemicals from the Sacramento, California site, monitor the American River and offsite public water supply wells, operate Groundwater Extraction and Treatment facilities that collect groundwater at the site perimeter, and pay certain government oversight costs. The primary chemicals of concern for both on-site and off-site groundwater are trichloroethylene, perchlorate, and n-nitrosodimethylamine. The 2002 PCD revision (a) separated the Sacramento site into

17

multiple operable units to allow quicker implementation of remedy for critical areas; (b) required the Company to guarantee up to $75 million (in addition to a prior $20 million guarantee) to assure that Aerojet Rocketdyne’s Sacramento remediation activities are fully funded; and (c) removed approximately 2,600 acres of non-contaminated land from the EPA superfund designation.

Aerojet Rocketdyne is involved in various stages of soil and groundwater investigation, remedy selection, design, construction, operation and maintenance associated with the operable units, all of which are conducted under the direction and oversight of the EPA, including unilateral administrative orders, and the California Department of Toxic Substances Control (“DTSC”) and Regional Water Quality Control Board, Central Valley Region (“RWQCB”). On September 22, 2016, the EPA completed its first five-year remedy review of the Sacramento superfund site.  The five-year review required by statute and regulation applies to all remedial actions which result in hazardous substances above levels that allow unlimited use and unrestricted exposure.  The Company is working with the EPA to address the findings of the five-year remedy review. On June 20, 2018, the EPA issued the Company a Unilateral Administrative Order (“UAO”) for the Boundary Operable Unit. Issuance of the UAO is the next step in the Superfund process for the Boundary Operable Unit.

The entire southern portion of the site known as Rio Del Oro was under state orders issued in the 1990s from DTSC and the RWQCB to investigate and remediate soil and groundwater contamination. In 2008, the DTSC released all but approximately 400 acres of the Rio Del Oro property from DTSC’s environmental orders regarding soil contamination although  the property remains subject to the RWQCB’s orders to investigate and remediate groundwater environmental contamination emanating offsite from the property.

As of June 30, 2018, the estimated range of anticipated costs discussed above for the Sacramento, California site was $205.4 million to $325.4 million and the accrued amount was $205.4 million included as a component of the Company’s environmental reserves. Expenditures associated with this matter are partially recoverable. See Note 8(c) below for further discussion on recoverability.

Baldwin Park Operable Unit (“BPOU”)

As a result of its former Azusa, California operations, in 1994 Aerojet Rocketdyne was named a PRP by the EPA in the area of the San Gabriel Valley Basin superfund site known as the BPOU. In 2002, Aerojet Rocketdyne, along with seven other PRPs (the “Cooperating Respondents”) signed a project agreement in late March 2002 with the San Gabriel Basin Water Quality Authority, the Main San Gabriel Basin Watermaster, and five water companies (the “Water Entities”). The 2002 project agreement terminated in 2017 and the parties executed a new project agreement which became operational on May 9, 2017. The new agreement has a ten-year term and requires the Cooperating Respondents to fund through an escrow account the ongoing operation, maintenance, and administrative costs of certain treatment and water distribution facilities owned and operated by the water companies. There are also provisions in the project agreement for maintaining financial assurance.

Pursuant to an agreement with the remaining Cooperating Respondents, Aerojet Rocketdyne's current share of future BPOU costs will be approximately74%.

As part of Aerojet Rocketdyne’s sale of its Electronics and Information Systems (“EIS”) business to Northrop in October 2001, the EPA approved a prospective purchaser agreement with Northrop to absolve it of pre-closing liability for contamination caused by the Azusa, California operations, which liability remains with Aerojet Rocketdyne. As part of that agreement, the Company agreed to provide a $25 million guarantee of its obligations under the project agreement.

As of June 30, 2018, the estimated range of anticipated costs was $110.4 million to $140.8 million and the accrued amount was $110.4 million included as a component of the Company’s environmental reserves. Expenditures associated with this matter are partially recoverable. See Note 8(c) below for further discussion on recoverability.

c. Environmental Reserves and Estimated Recoveries

Environmental Reserves

The Company reviews on a quarterly basis estimated future remediation costs and has an established practice of estimating environmental remediation costs over a fifteen year period, except for those environmental remediation costs with a specific contractual term. Environmental liabilities at the BPOU site are currently estimated through the term of the new project agreement, which expires in May 2027. As the period for which estimated environmental remediation costs lengthens, the reliability of such estimates decreases. These estimates consider the investigative work and analysis of engineers, outside environmental consultants, and the advice of legal staff regarding the status and anticipated results of various administrative and legal proceedings. In most cases, only a range of reasonably possible costs can be estimated. In establishing the Company’s reserves, the most probable estimate is used when determinable; otherwise, the minimum amount is used when no single amount in the range is more probable. Accordingly, such estimates can change as the Company periodically evaluates and revises these estimates as new information becomes available. The Company cannot predict whether new information gained as projects progress will affect the estimated liability accrued. The timing of payment for estimated future

18

environmental costs is influenced by a number of factors, such as the regulatory approval process and the time required designing, constructing, and implementing the remedy.

A summary of the Company’s environmental reserve activity is shown below:

	Aerojet Rocketdyne- Sacramento			Aerojet Rocketdyne- BPOU			Other Aerojet Rocketdyne Sites			Total Aerojet Rocketdyne			Other			Total Environmental Reserve
	(In millions)
December 31, 2017	$	206.5		$	116.4		$	13.7		$	336.6		$	4.8		$	341.4
Additions	8.9			0.8			0.4			10.1			0.5			10.6
Expenditures	(10.0		)	(6.8		)	(1.0		)	(17.8		)	(0.5		)	(18.3		)
June 30, 2018	$	205.4		$	110.4		$	13.1		$	328.9		$	4.8		$	333.7

The effect of the final resolution of environmental matters and the Company’s obligations for environmental remediation and compliance cannot be accurately predicted due to the uncertainty concerning both the amount and timing of future expenditures and due to regulatory or technological changes. The Company continues its efforts to mitigate past and future costs through pursuit of claims for recoveries from insurance coverage and other PRPs and continued investigation of new and more cost effective remediation alternatives and associated technologies.

As part of the acquisition of the Atlantic Research Corporation (“ARC”) propulsion business in 2003, Aerojet Rocketdyne entered into an agreement with ARC pursuant to which Aerojet Rocketdyne is responsible for up to $20.0 million of costs (“Pre-Close Environmental Costs”) associated with environmental issues that arose prior to Aerojet Rocketdyne’s acquisition of the ARC propulsion business. ARC is responsible for any cleanup costs relating to the ARC acquired businesses in excess of $20.0 million. Pursuant to a separate agreement with the U.S. government which was entered into prior to the completion of the ARC acquisition, these costs are recovered through the establishment of prices for Aerojet Rocketdyne’s products and services sold to the U.S. government. The Company reached the $20.0 million cap on cleanup costs in the three months ended March 31, 2017, and expects that additional costs will be incurred due to contamination existing at the time of the acquisition and still requiring remediation and monitoring. On May 6, 2016, ARC informed Aerojet Rocketdyne that it was disputing certain costs that Aerojet Rocketdyne attributed to the $20.0 million Pre-Close Environmental Costs (“ARC Claim”). The Company has met with ARC and responded to the ARC Claim on June 23, 2017. Certain costs related to the ARC Claim will be determined in conjunction with the Company’s evaluation and ultimate resolution of the ARC Claim.

Estimated Recoveries

On January 12, 1999, Aerojet Rocketdyne and the U.S. government reached a settlement agreement (“Global Settlement”) which established a cost-sharing ratio with respect to the clean-up costs of prior environmental contamination. Additionally, in conjunction with the sale of the EIS business in 2001, Aerojet Rocketdyne entered into an agreement with Northrop (the “Northrop Agreement”) whereby Aerojet Rocketdyne is reimbursed by Northrop for a portion of environmental expenditures eligible for recovery under the Global Settlement, subject to an annual billing limitation of $6.0 million and a cumulative limitation of $189.7 million. The cumulative expenditure limitation of $189.7 million was reached in the three months ended June 30, 2017. A summary of the Northrop Agreement activity is shown below (in millions):

Total reimbursable costs under the Northrop Agreement	$	189.7
Amount reimbursed to the Company through June 30, 2018	(128.2		)
Potential future cost reimbursements available	$	61.5

Environmental remediation costs are primarily incurred by the Company's Aerospace and Defense segment, and certain of these costs are recoverable from the Company's contracts with the U.S. government. The Company currently estimates approximately 24% of its future Aerospace and Defense segment environmental remediation costs will not likely be reimbursable and are expensed.

Allowable environmental remediation costs are charged to the Company’s contracts as the costs are incurred. Because these costs are recovered through forward-pricing arrangements, the ability of Aerojet Rocketdyne to continue recovering these costs from the U.S. government depends on Aerojet Rocketdyne’s sustained business volume from U.S. government contracts and programs.

While the Company is currently seeking an arrangement with the U.S. government to recover environmental expenditures in excess of the reimbursement ceiling identified in the Northrop Agreement and Global Settlement, there can be no assurances that such a recovery will be obtained, or if not obtained, that such unreimbursed environmental expenditures will not have a materially adverse effect on the Company’s operating results, financial condition, and/or cash flows.

19

Environmental reserves and estimated recoveries impact to unaudited condensed consolidated statements of operations

The expenses associated with adjustments to the environmental reserves are recorded as a component of other expense (income), net in the unaudited condensed consolidated statements of operations. Summarized financial information for the impact of environmental reserves and recoveries to the unaudited condensed consolidated statements of operations is set forth below:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Estimated recoverable amounts under U.S. government contracts	$	3.7	$	3.8	$	7.8	$	7.7
Expense to unaudited condensed consolidated statement of operations	1.4		0.9		2.8		1.7
Total environmental reserve adjustments	$	5.1	$	4.7	$	10.6	$	9.4

d. Arrangements with Off-Balance Sheet Risk

As of June 30, 2018, arrangements with off-balance sheet risk consisted of:

• $38.4 million in outstanding commercial letters of credit,the majority of which may be renewed, primarily to collateralize obligations for environmental remediation and insurance coverage.

• $53.6 million in outstanding surety bonds to primarily satisfy indemnification obligations for environmental remediation coverage.

• $120.0 million aggregate in guarantees by the Company of Aerojet Rocketdyne’s obligations to U.S. government agencies for environmental remediation activities.

• $82.5 million in commitments associated with the Company's new facilities located in Huntsville, Alabama.

• Guarantees, jointly and severally, by the Company’s material domestic subsidiaries of their obligations under the Senior Credit Facility.

In addition to the items discussed above, the Company has and will from time to time enter into certain types of contracts that require the Company to indemnify parties against potential third-party and other claims. These contracts primarily relate to: (i) divestiture agreements, under which the Company may provide customary indemnification to purchasers of its businesses or assets including, for example, claims arising from the operation of the businesses prior to disposition, and liability to investigate and remediate environmental contamination existing prior to disposition; (ii) certain real estate leases, under which the Company may be required to indemnify property owners for claims arising from the use of the applicable premises; and (iii) certain agreements with officers and directors, under which the Company may be required to indemnify such persons for liabilities arising out of their relationship with the Company. The terms of such obligations vary. Generally, a maximum obligation is not explicitly stated.

Additionally, the Company has open purchase orders and other commitments to suppliers, subcontractors, and other outsourcing partners for equipment, materials, and supplies in the normal course of business. These amounts are based on volumes consistent with anticipated requirements to fulfill purchase orders or contracts for product deliveries received, or expected to be received, from customers. A substantial portion of these amounts are recoverable through the Company's contracts with the U.S. government.

The Company provides product warranties in conjunction with certain product sales. The majority of the Company’s warranties are a one-year standard warranty for parts, workmanship, and compliance with specifications. On occasion, the Company has made commitments beyond the standard warranty obligation. While the Company has contracts with warranty provisions, there is not a history of any significant warranty claims experience. A reserve for warranty exposure is made on a product by product basis when it is both estimable and probable. These costs are included in the program’s estimate at completion and are expensed in accordance with the Company’s revenue recognition methodology as allowed under GAAP for that particular contract.

Note 9. Cost Reduction Plans

During 2015, the Company initiated the first phase (“Phase I”) of the competitive improvement program (the “CIP”) comprised of activities and initiatives aimed at reducing costs in order for the Company to continue to compete successfully. Phase I is comprised of three major components: (i) facilities optimization and footprint reduction; (ii) product affordability; and (iii) reduced administrative and overhead costs. On April 6, 2017, the Board of Directors approved the second phase (“Phase II”) of the Company’s previously announced CIP. Pursuant to Phase II, the Company is expanding its CIP and further consolidating its Sacramento, California, and Gainesville, Virginia sites, while centralizing and expanding its existing presence in Huntsville, Alabama. The Company currently estimates that it will incur restructuring and related costs of the Phase I and II

20

programs of approximately $235.1 million (including approximately $60.5 million of capital expenditures). The Company has incurred $97.9 million of such costs through June 30, 2018, including $36.6 million in capital expenditures. A summary of the Company's severance and retention liabilities related to Phase I and II activity is shown below:

	Severance			Retention			Total
	(In millions)
December 31, 2017	$	30.0		$	3.4		$	33.4
Accrual	—			2.7			2.7
Payments	(5.4		)	(2.4		)	(7.8		)
June 30, 2018	$	24.6		$	3.7		$	28.3

The costs associated with Phase I and II are included as a component of the Company’s U.S. government forward-pricing rates, and therefore, are recovered through the pricing of the Company’s products and services to the U.S. government. In addition to the employee-related CIP obligations, the Company incurred non-cash accelerated depreciation expense of $0.7 million and $2.2 million in the six months ended June 30, 2018 and 2017, respectively, associated with changes in the estimated useful lives of long-lived assets.

Note 10. Retirement Benefits

Components of retirement benefits expense (income) are:

	Pension Benefits						Postretirement Medical and Life Insurance Benefits
	Three months ended June 30,
	2018			2017			2018			2017
	(In millions)
Interest cost on benefit obligation	$	12.5		$	14.4		$	0.3		$	0.3
Assumed return on plan assets	(15.1		)	(12.4		)	—			—
Amortization of prior service costs	0.1			0.1			—			—
Recognized net actuarial losses (gains)	17.6			16.9			(1.0		)	(1.0		)
Retirement benefits expense (income)	$	15.1		$	19.0		$	(0.7	)	$	(0.7	)

	Pension Benefits						Postretirement Medical and Life Insurance Benefits
	Six months ended June 30,
	2018			2017			2018			2017
	(In millions)
Interest cost on benefit obligation	$	24.9		$	28.8		$	0.6		$	0.7
Assumed return on plan assets	(30.1		)	(24.8		)	—			—
Amortization of prior service costs (credits)	0.1			0.1			(0.1		)	(0.1		)
Recognized net actuarial losses (gains)	35.3			33.9			(1.9		)	(2.0		)
Retirement benefits expense (income)	$	30.2		$	38.0		$	(1.4	)	$	(1.4	)

Service costs represent the annual growth in benefits earned by participants during the year. Since the Company’s defined benefit pension plan future benefit accrual is discontinued for all participants, the Company has determined in connection with the adoption of accounting guidance on presentation of service cost and other components of retirement benefits expense that the service cost is zero for all periods presented.  Historically, the Company has included expenses paid from the tax-qualified defined benefit pension plan trust, including Public Benefit Guaranty Corporation, audit, actuarial, legal and administrative fees, as service costs in the presentation of the components of retirement benefits expense (income). The Company determined that the vast majority of these types of expenses reflect a reduction to the assumed return on plan assets because they reduce the expected growth of the plan assets.  As such, the Company has elected to reclassify the trust-paid expenses related to the tax-qualified defined benefit pension plan as a reduction to assumed return on plan assets for all periods presented. For the three and six months ended June 30, 2017, the Company has reclassified expenses of $3.8 million and $7.5 million, respectively, from service cost to assumed return on plan assets in the table above. This change in presentation had no impact on net retirement benefits expense (income).

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Note 11. 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.

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

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

The Company's sales to each of the major customers listed above involve several product lines and programs.

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Note 12. Unusual Items

Total unusual items, a component of other expense (income), net in the unaudited condensed consolidated statements of operations, were as follows:

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
	(In millions)
Unusual items
Legal related matters	$	—	$	(1.3	)	$	—	$	(1.9	)
Acquisition costs	—		—			—		1.0
	$	—	$	(1.3	)	$	—	$	(0.9	)

Three and six months ended June 30, 2017, activity:

During the three and six months ended June 30, 2017, the Company recorded $1.3 million and $1.9 million, respectively, of realized gains, net of interest associated with the failure to register with the Securities and Exchange Commission the issuance of certain of the Company’s common shares under the defined contribution 401(k) employee benefit plan.

During the six months ended June 30, 2017, the Company recorded $1.0 million of costs related to the acquisition of the Coleman Aerospace Business.

Note 13. Adoption of Revenue Recognition Guidance

The Company adopted the new revenue recognition guidance effective January 1, 2018, using the modified retrospective method, with the cumulative effect recognized as of January 1, 2018. The primary impact of the new guidance was a change in the timing of revenue recognition on certain long-term contracts in the Company’s Aerospace and Defense segment. The adoption of the new revenue recognition guidance did not impact revenue recognized within the Company's Real Estate segment. The new guidance does not change the total sales or operating income on the related customer contracts, only the timing of when sales and operating income are recognized. Under this new guidance, the Company discontinued the use of the unit-of-delivery revenue recognition method on certain customer contracts and re-measured the performance obligations using the cost-to-cost method. The unit-of-delivery method was utilized for 48% of net sales for the year ended December 31, 2017. The cumulative favorable impact of the adoption was $37.6 million of net income which was recorded to stockholders' equity.

Further, as the Company’s adoption of the guidance accelerated the timing of revenue recognition on some of the Company's contracts, the adoption resulted in a $0.6 billion reduction in the Company's remaining performance obligations, also referred to as backlog, as of December 31, 2017.

The following tables summarize the effect of adoption of the new revenue recognition standard on the Company’s unaudited condensed consolidated financial statements as of and for the three and six months ended June 30, 2018.

23

Condensed Consolidated Statement of Operations

(Unaudited)

	Three months ended June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions, except per share amounts)
Net sales	$	467.2		$	9.4		$	476.6
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	369.5			12.9			382.4
Selling, general and administrative expense	11.1			—			11.1
Depreciation and amortization	17.7			—			17.7
Other expense, net	0.9			—			0.9
Total operating costs and expenses	399.2			12.9			412.1
Operating income	68.0			(3.5		)	64.5
Non-operating (income) expense:
Retirement benefits expense	14.4			—			14.4
Interest income	(2.0		)	—			(2.0		)
Interest expense	8.3			—			8.3
Total non-operating expense, net	20.7			—			20.7
Income before income taxes	47.3			(3.5		)	43.8
Income tax provision	12.5			(1.1		)	11.4
Net income	$	34.8		$	(2.4	)	$	32.4
Earnings Per Share of Common Stock
Basic
Basic net income per share	$	0.46		$	(0.03	)	$	0.43
Diluted
Diluted net income per share	$	0.45		$	(0.03	)	$	0.42
Weighted average shares of common stock outstanding, basic	73.9			—			73.9
Weighted average shares of common stock outstanding, diluted	75.1			—			75.1

Condensed Consolidated Statement of Comprehensive Income

(Unaudited)

	Three months ended June 30, 2018
	As Reported		Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
Net income	$	34.8	$	(2.4	)	$	32.4
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes	12.5		—			12.5
Comprehensive income	$	47.3	$	(2.4	)	$	44.9

24

Condensed Consolidated Statement of Operations

(Unaudited)

	Six months ended June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions, except per share amounts)
Net sales	$	959.2		$	(13.2	)	$	946.0
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	796.3			(1.8		)	794.5
Selling, general and administrative expense	17.8			—			17.8
Depreciation and amortization	35.4			—			35.4
Other expense, net	2.1			—			2.1
Total operating costs and expenses	851.6			(1.8		)	849.8
Operating income	107.6			(11.4		)	96.2
Non-operating (income) expense:
Retirement benefits expense	28.8			—			28.8
Interest income	(3.6		)	—			(3.6		)
Interest expense	16.4			—			16.4
Total non-operating expense, net	41.6			—			41.6
Income before income taxes	66.0			(11.4		)	54.6
Income tax provision	17.2			(3.1		)	14.1
Net income	$	48.8		$	(8.3	)	$	40.5
Earnings Per Share of Common Stock
Basic
Basic net income per share	$	0.65		$	(0.11	)	$	0.54
Diluted
Diluted net income per share	$	0.64		$	(0.11	)	$	0.53
Weighted average shares of common stock outstanding, basic	73.8			—			73.8
Weighted average shares of common stock outstanding, diluted	75.0			—			75.0

Condensed Consolidated Statement of Comprehensive Income

(Unaudited)

	Six months ended June 30, 2018
	As Reported		Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
Net income	$	48.8	$	(8.3	)	$	40.5
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes	25.0		—			25.0
Comprehensive income	$	73.8	$	(8.3	)	$	65.5

25

Condensed Consolidated Balance Sheet

(Unaudited)

	As of June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	514.7		$	—		$	514.7
Marketable securities	44.9			—			44.9
Accounts receivable	134.6			(55.9		)	78.7
Contract assets	253.1			19.5			272.6
Other current assets, net	123.2			(10.5		)	112.7
Total Current Assets	1,070.5			(46.9		)	1,023.6
Noncurrent Assets
Property, plant and equipment, net	357.8			—			357.8
Recoverable environmental remediation costs	225.8			—			225.8
Deferred income taxes	255.5			(117.4		)	138.1
Goodwill	161.3			—			161.3
Intangible assets	78.7			—			78.7
Other noncurrent assets, net	260.5			—			260.5
Total Noncurrent Assets	1,339.6			(117.4		)	1,222.2
Total Assets	$	2,410.1		$	(164.3	)	$	2,245.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt	$	30.4		$	—		$	30.4
Accounts payable	104.1			—			104.1
Reserves for environmental remediation costs	34.6			—			34.6
Contract liabilities	185.3			13.9			199.2
Other current liabilities	313.0			(132.3		)	180.7
Total Current Liabilities	667.4			(118.4		)	549.0
Total Noncurrent Liabilities	1,522.6			—			1,522.6
Total Liabilities	2,190.0			(118.4		)	2,071.6
Stockholders’ Equity
Common stock	7.4			—			7.4
Other capital	509.4			—			509.4
Treasury stock at cost	(64.5		)	—			(64.5		)
Retained earnings (accumulated deficit)	15.4			(45.9		)	(30.5		)
Accumulated other comprehensive loss, net of income taxes	(247.6		)	—			(247.6		)
Total Stockholders’ Equity	220.1			(45.9		)	174.2
Total Liabilities and Stockholders’ Equity	$	2,410.1		$	(164.3	)	$	2,245.8

26

Condensed Consolidated Statement of Cash Flows

(Unaudited)

	Six months ended June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
Operating Activities
Net income	$	48.8		$	(8.3	)	$	40.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35.4			—			35.4
Amortization of debt discount and deferred financing costs	4.4			—			4.4
Stock-based compensation	6.7			—			6.7
Retirement benefits, net	6.7			—			6.7
Insurance proceeds	(1.9		)	—			(1.9		)
Other, net	(0.1		)	—			(0.1		)
Changes in assets and liabilities:
Accounts receivable	(40.7		)	26.5			(14.2		)
Contract assets	(7.5		)	3.0			(4.5		)
Other current assets, net	16.3			0.4			16.7
Recoverable environmental remediation costs	5.3			—			5.3
Other noncurrent assets	(1.5		)	—			(1.5		)
Accounts payable	(9.7		)	—			(9.7		)
Contract liabilities	(58.1		)	(19.5		)	(77.6		)
Other current liabilities	21.8			1.0			22.8
Deferred income taxes	2.3			(3.1		)	(0.8		)
Reserves for environmental remediation costs	(7.7		)	—			(7.7		)
Other noncurrent liabilities and other	4.0			—			4.0
Net Cash Provided by Operating Activities	24.5			—			24.5
Investing Activities
Purchases of marketable securities	(44.7		)	—			(44.7		)
Sales of marketable securities	20.1			—			20.1
Insurance proceeds	1.9			—			1.9
Capital expenditures	(12.2		)	—			(12.2		)
Net Cash Used in Investing Activities	(34.9		)	—			(34.9		)
Financing Activities
Debt repayments	(10.3		)	—			(10.3		)
Repurchase of shares for withholding taxes and option costs under employee equity plans	(2.1		)	—			(2.1		)
Proceeds from shares issued under equity plans	2.5			—			2.5
Net Cash Used in Financing Activities	(9.9		)	—			(9.9		)
Net Decrease in Cash and Cash Equivalents	(20.3		)	—			(20.3		)
Cash and Cash Equivalents at Beginning of Period	535.0			—			535.0
Cash and Cash Equivalents at End of Period	$	514.7		$	—		$	514.7

27

The following table summarizes the reclassifications to the December 31, 2017, balance sheet to conform to the current year’s presentation.

	As Reported		Reclassifications due to Adoption			As Adjusted
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	535.0	$	—		$	535.0
Marketable securities	20.0		—			20.0
Accounts receivable	215.5		(151.0		)	64.5
Inventories	136.4		(136.4		)	—
Contract assets	—		268.1			268.1
Other current assets, net	109.8		19.3			129.1
Total Current Assets	1,016.7		—			1,016.7
Total Noncurrent Assets	1,242.0		—			1,242.0
Total Assets	$	2,258.7	$	—		$	2,258.7
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt	$	25.0	$	—		$	25.0
Accounts payable	100.9		—			100.9
Reserves for environmental remediation costs	35.2		—			35.2
Contract liabilities	—		276.8			276.8
Advance payments on contracts	237.8		(237.8		)	—
Other current liabilities	195.9		(39.0		)	156.9
Total Current Liabilities	594.8		—			594.8
Total Noncurrent Liabilities	1,561.5		—			1,561.5
Total Liabilities	2,156.3		—			2,156.3
Stockholders’ Equity
Total Stockholders’ Equity	102.4		—			102.4
Total Liabilities and Stockholders’ Equity	$	2,258.7	$	—		$	2,258.7

28

The following table summarizes the reclassifications to the six months ended June 30, 2017, statement of cash flows to conform to the current year’s presentation.

	As Reported			Reclassifications due to Adoption			As Adjusted
	(In millions)
Operating Activities
Net income	$	30.2		$	—		$	30.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35.4			—			35.4
Amortization of debt discount and deferred financing costs	4.2			—			4.2
Stock-based compensation	10.2			—			10.2
Retirement benefits, net	15.4			—			15.4
Other, net	0.3			—			0.3
Changes in assets and liabilities, net of effects from acquisition in 2017:
Accounts receivable	(87.8		)	37.5			(50.3		)
Inventories	20.7			(20.7		)	—
Contract assets	—			(9.7		)	(9.7		)
Other current assets, net	19.3			(7.1		)	12.2
Recoverable environmental remediation costs	10.1			—			10.1
Other noncurrent assets	(31.5		)	—			(31.5		)
Accounts payable	12.6			—			12.6
Contract liabilities	—			(43.0		)	(43.0		)
Advance payments on contracts	(49.0		)	49.0			—
Other current liabilities	19.6			(6.0		)	13.6
Deferred income taxes	15.9			—			15.9
Reserves for environmental remediation costs	(10.8		)	—			(10.8		)
Other noncurrent liabilities and other	22.9			—			22.9
Net Cash Provided by Operating Activities	37.7			—			37.7
Investing Activities
Net Cash Used in Investing Activities	(21.1		)	—			(21.1		)
Financing Activities
Net Cash Used in Financing Activities	(13.3		)	—			(13.3		)
Net Increase in Cash and Cash Equivalents	3.3			—			3.3
Cash and Cash Equivalents at Beginning of Period	410.3			—			410.3
Cash and Cash Equivalents at End of Period	$	413.6		$	—		$	413.6

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Unless otherwise indicated or required by the context, as used in this Quarterly Report on Form 10-Q, the terms “the Company,” “we,” “our” and “us” refer to Aerojet Rocketdyne Holdings, Inc. and all of its subsidiaries that are consolidated in conformity with accounting principles generally accepted in the United States of America (“GAAP”).

The preparation of the consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates. In addition, our operating results for interim periods may not be indicative of the results of operations for a full year or future periods. This section contains a number of forward-looking statements, all of which are based on current expectations and are subject to risks and uncertainties including those described in this Quarterly Report under the heading “Forward-Looking Statements.” Actual results may differ materially. This section should be read in conjunction with our Annual Report on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017, and periodic reports subsequently filed with the Securities and Exchange Commission (“SEC”).

Overview

Our operations are organized into two segments:

Aerospace and Defense — includes the operations of our wholly-owned subsidiary Aerojet Rocketdyne, Inc. (“Aerojet Rocketdyne”), a leading technology-based designer, developer and manufacturer of aerospace and defense products and systems for the United States (“U.S.”) government, including the Department of Defense (“DoD”), the National Aeronautics and Space Administration (“NASA”), and major aerospace and defense prime contractors.

Real Estate — includes the activities of our wholly-owned subsidiary Easton Development Company, LLC (“Easton”) related to the re-zoning, entitlement, sale, and leasing of our excess real estate assets. We currently are in the process of seeking zoning changes and other governmental approvals on our excess real estate assets to optimize their value.

A summary of the significant financial highlights for the three months ended June 30, 2018, which management uses to evaluate our operating performance and financial condition, is presented below.

• Net sales for the three months ended June 30,2018, totaled $467.2 million compared with $459.6 million for the three months ended June 30,2017.

• Net income for the three months ended June 30,2018, was $34.8 million, or $0.45 diluted income per share, compared with net income of $24.3 million, or $0.32 diluted income per share, for the three months ended June 30,2017.

• Adjusted EBITDAP (Non-GAAP measure*) for the three months ended June 30,2018, was $75.8 million compared with $69.4 million for the three months ended June 30,2017.

• Segment performance before environmental remediation provision adjustments, retirement benefits, net, and unusual items (Non-GAAP measure*) was $70.1 million for the three months ended June 30,2018, compared with $59.6 million for the three months ended June 30,2017.

• Cash provided byoperating activities for the three months ended June 30,2018, totaled $119.9 million compared with $40.8 million of cash provided by operating activities for the three months ended June 30,2017.

• Effective January 1, 2018, we adopted the new revenue recognition guidance. Consistent with the standard, net assets increased by $37.6 million and $578.0 million of net sales were recognized in the cumulative effect at January 1, 2018, with a corresponding reduction to backlog.

• Total backlog as of June 30, 2018, was $3.9 billion compared with $4.6 billion as of December 31, 2017.

_________

* We provide Non-GAAP measures as a supplement to financial results presented in accordance with GAAP. A reconciliation of the Non-GAAP measures to the most directly comparable GAAP measures is presented later in the Management’s Discussion and Analysis under the heading “Operating Segment Information” and “Use of Non-GAAP Financial Measures.”

In May 2014, the Financial Accounting Standards Board (“FASB”) amended the existing accounting standards for revenue recognition. The amendments are based on the principle that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. We adopted the guidance effective January 1, 2018, using the modified retrospective method, with the cumulative effect recognized as of January 1, 2018. All applicable amounts and disclosures for the three and six months ended June 30, 2018, reflect the impact of adoption. As we elected to use the modified retrospective method, prior periods presented have not been restated to reflect the impact of adoption. Reclassifications have been made where noted for conforming presentation only (see Notes 3 and 13 of the Notes to Unaudited Condensed Consolidated Financial Statements).

Our business outlook is affected by both increasing complexity in the global security environment and continuing worldwide economic pressures. A significant component of our strategy in this environment is to focus on delivering excellent

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performance to our customers, driving improvements and efficiencies across our operations, and creating value through the enhancement and expansion of our business.

Some of the significant challenges we face are as follows: dependence upon U.S. government programs and contracts, future reductions or changes in U.S. government spending in our markets, successful implementation of our cost reduction plans, environmental matters, capital structure, and our underfunded retirement benefit plans.

Major Customers

The principal end user customers of our products and technology are primarily agencies of the U.S. government. Since a majority of our sales are, directly or indirectly, to the U.S. government, funding for the purchase of our products and services generally follows trends in U.S. aerospace and defense spending. However, individual U.S. government agencies, which include the military services, NASA, the Missile Defense Agency, and the prime contractors that serve these agencies, exercise independent purchasing power within “budget top-line” limits. Therefore, sales to the U.S. government are not regarded as sales to one customer, but rather each contracting agency is viewed as a separate customer.

Sales to the U.S. government and its agencies, including sales to our significant customers disclosed below, were as follows:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
U.S. government	93	%	93	%	93	%	93	%
Non U.S. government customers	7		7		7		7

The following are percentages of net sales for significant programs, all of which are included in the U.S. government sales and are comprised of multiple contracts.

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
RS-25	15	%	15	%	14	%	16	%
Standard Missile	11		6		14		7
Terminal High Altitude Area Defense (“THAAD”)	12		11		11		9

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

Our sales to each of the major customers listed above involve several product lines and programs.

Industry Update

Our primary aerospace and defense customers include the DoD and its agencies, NASA, and the prime contractors that supply products to these customers. We rely on U.S. government spending on aerospace and defense products and systems, and our backlog depends, in large part, on continued funding by the U.S. government for the programs in which we are involved.

Nearly six months into government fiscal year (“GFY”) 2018 and after multiple Continuing Resolutions, the President signed into law a $1.3 trillion Omnibus Appropriations bill that funds all government agencies, including the DoD and NASA, for the remainder of GFY 2018.  The final GFY 2018 DoD Appropriations portion of the Omnibus includes $589.4 billion in base budget funding and $65.2 billion in Overseas Contingency Operations.  Both are higher than the President’s Budget Request for GFY 2018, and higher than GFY 2017 enacted levels.  When combined with previous GFY 2018 defense funds appropriated in late December, the DoD total for GFY 2018 is $659.5 billion. More specific to some key Aerojet Rocketdyne end-markets, the GFY 2018 Appropriations bill included an additional $4.7 billion of funding for missile defense, on top of the $9.2 billion requested for GFY 2018. The bill also includes a topline of $20.7 billion for NASA, more than a billion dollars above the GFY 2017 level, and $2.2 billion for the Space Launch System, a key program for Aerojet Rocketdyne.

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Cost Reduction Plans

During 2015, we initiated the first phase (“Phase I”) of our competitive improvement program (“CIP”) comprised of activities and initiatives aimed at reducing costs in order for us to continue to compete successfully. Phase I is comprised of three major components: (i) facilities optimization and footprint reduction; (ii) product affordability; and (iii) reduced administrative and overhead costs. On April 6, 2017, the Board of Directors approved the second phase (“Phase II”) of our previously announced CIP. Pursuant to Phase II, we are expanding CIP and further consolidating our Sacramento, California, and Gainesville, Virginia sites, while centralizing and expanding our existing presence in Huntsville, Alabama. When fully implemented, we anticipate that the CIP will result in annual costs that are $230 million below levels anticipated prior to CIP.

We currently estimate that we will incur restructuring and related costs of the Phase I and II programs of approximately $235.1 million (including approximately $60.5 million of capital expenditures). We have incurred $97.9 million through June 30, 2018, including $36.6 million in capital expenditures.

Environmental Matters

Our current and former business operations are subject to, and affected by, federal, state, local, and foreign environmental laws and regulations relating to the discharge, treatment, storage, disposal, investigation, and remediation of certain materials, substances, and wastes. Our policy is to conduct our business with due regard for the preservation and protection of the environment. We continually assess compliance with these regulations and we believe our current operations are materially in compliance with all applicable environmental laws and regulations.

A summary of our recoverable amounts, environmental reserves, and estimated range of liability as of June 30, 2018, is presented below:

	Recoverable Amounts (1)		Environmental Reserves		Estimated Range of Liability
	(In millions)
Sacramento	$	155.7	$	205.4	$205.4- $325.4
Baldwin Park Operable Unit	83.7		110.4		110.4 - 140.8
Other Aerojet Rocketdyne sites	11.4		13.1		13.1 - 20.6
Other sites	0.7		4.8		4.8 - 6.3
Total	$	251.5	$	333.7	$333.7 - $493.1

_____

(1) Excludes the receivable from Northrop Grumman Corporation (“Northrop”) of $61.5 million as of June 30, 2018, related to environmental costs already paid (and therefore not reserved) by us in prior years and reimbursable under our agreement with Northrop. The cumulative limitation under our agreement with Northrop was reached in the three months ended June 30, 2017.

Environmental remediation costs are primarily incurred by our Aerospace and Defense segment, and certain of these costs are recoverable from our contracts with the U.S. government. We currently estimate approximately 24% of our future Aerospace and Defense segment environmental remediation costs will not likely be reimbursable and are expensed.

Capital Structure

We have a substantial amount of debt for which we are required to make interest and principal payments. Interest on long-term financing is not a recoverable cost under our U.S. government contracts. As of June 30, 2018, we had $611.4 million of debt outstanding.

Retirement Benefits

We expect to make cash contributions of $36.7 million to our tax-qualified defined benefit pension plan in the year ending December 31, 2018, which is expected to be recoverable from our U.S. government contracts in 2018. We generally are able to recover cash contributions related to our tax-qualified defined benefit pension plan as allowable costs on our U.S. government contracts, but there can be differences between when we contribute cash to our tax-qualified defined benefit pension plan under pension funding rules and recover it under Cost Accounting Standards (“CAS”).

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Results of Operations

Net Sales:

	Three months ended June 30,						Six months ended June 30,
	2018		2017		Change*		2018		2017		Change**
	(In millions)
Net sales:	$	467.2	$	459.6	$	7.6	$	959.2	$	864.9	$	94.3

Net sales was significantly impacted by the adoption of new revenue recognition guidance effective January 1, 2018, using the modified retrospective method. The primary impact of the new guidance was a change in the timing of revenue recognition on certain long-term contracts. Under this new guidance, we discontinued the use of the unit-of-delivery method on certain customer contracts and re-measured the performance obligations using the cost-to-cost method.

* Primary reason for change. Net sales in the three months ended June 30, 2018, would have been $476.6 million under the previous revenue recognition guidance which is $17.0 million higher than the net sales reported in the three months ended June 30, 2017, resulting from an increase of $31.9 million in defense programs primarily driven by increased deliveries on the Standard Missile and Patriot Advanced Capability-3 (“PAC-3”) programs. The increase in net sales was partially offset by a decrease of $14.9 million in space programs. The Atlas V program, which concludes in the third quarter of 2018, contributed sales of $13.1 million under the new revenue recognition guidance in the three months ended June 30, 2018, and sales of $29.6 million under the previous revenue recognition guidance in the three months ended June 30, 2018.

** Primary reason for change. Net sales in the six months ended June 30, 2018, would have been $946.0 million under the previous revenue recognition guidance which is $81.1 million higher than the net sales reported in the six months ended June 30, 2017, resulting from an increase of $117.3 million in defense programs primarily driven by increased deliveries on the Standard Missile, PAC-3, and THAAD programs. The increase in net sales was partially offset by a decrease of $36.2 million in space programs primarily driven by performance issues on the Commercial Crew Development program and lower deliveries on the Atlas V program. The Atlas V program, which concludes in the third quarter of 2018, contributed sales of $32.3 million under the new revenue recognition guidance in the six months ended June 30, 2018, and sales of $44.6 million under the previous revenue recognition guidance in the six months ended June 30, 2018.

Cost of Sales (exclusive of items shown separately below):

	Three months ended June 30,									Six months ended June 30,
	2018			2017			Change*			2018			2017			Change**
	(In millions, except percentage amounts)
Cost of sales (exclusive of items shown separately below):	$	369.5		$	370.6		$	(1.1	)	$	796.3		$	710.0		$	86.3
Percentage of net sales	79.1		%	80.6		%				83.0		%	82.1		%

* Primary reason for change. The decrease in cost of sales as a percentage of net sales was primarily driven by risk retirements on the RS-25 program and better than expected overhead rate performance, partially offset by favorable contract performance on the THAAD program in 2017 as a result of risk retirements and cost reductions. The same factors drove the decrease in cost of sales as a percentage of net sales under the previous revenue recognition guidance.

** Primary reason for change. The increase in cost of sales as a percentage of net sales was primarily due to cost growth and performance issues in the current period on the Commercial Crew Development program and favorable contract performance in the prior period on the THAAD program, partially offset by risk retirements on the RS-25 program and better than expected overhead rate performance. The same factors drove the increase in cost of sales as a percentage of net sales under the previous revenue recognition guidance.

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Selling, General and Administrative Expense (“SG&A”):

	Three months ended June 30,									Six months ended June 30,
	2018			2017			Change*			2018			2017			Change**
	(In millions, except percentage amounts)
Components of SG&A:
SG&A excluding stock-based compensation	$	5.9		$	6.3		$	(0.4	)	$	11.1		$	13.0		$	(1.9	)
Stock-based compensation	5.2			3.4			1.8			6.7			10.2			(3.5		)
SG&A	$	11.1		$	9.7		$	1.4		$	17.8		$	23.2		$	(5.4	)
Percentage of net sales	2.4		%	2.1		%				1.9		%	2.7		%
Percentage of net sales excluding stock-based compensation	1.3		%	1.4		%				1.2		%	1.5		%

* Primary reason for change. The increase in SG&A expense was primarily driven by an increase of $1.8 million in stock-based compensation primarily as a result of increases in the fair value of the stock appreciation rights in the current period partially offset by a decrease in legal and professional services expenses.

** Primary reason for change. The decrease in SG&A expense was primarily driven by (i)a decrease of $3.5 million in stock-based compensation primarily as a result of decreases in the fair value of the stock appreciation rights in the current period and accelerated vesting of stock awards to a former executive officer in the three months ended March 31, 2017, and (ii) a decrease in legal and professional services expenses.

Depreciation and Amortization:

	Three months ended June 30,							Six months ended June 30,
	2018		2017		Change*			2018		2017		Change*
	(In millions)
Components of depreciation and amortization:
Depreciation	$	13.5	$	15.2	$	(1.7	)	$	27.2	$	27.7	$	(0.5	)
Amortization	3.5		3.4		0.1			6.9		6.7		0.2
Accretion	0.7		0.5		0.2			1.3		1.0		0.3
Depreciation and amortization	$	17.7	$	19.1	$	(1.4	)	$	35.4	$	35.4	$	—

* Primary reason for change. The decrease in depreciation expense was primarily the result of increased accelerated depreciation in the three and six months ended June 30, 2017, associated with changes in the estimated useful lives of long-lived assets to support the cost saving initiatives of the CIP.

Other Expense (Income), net:

	Three months ended June 30,							Six months ended June 30,
	2018		2017			Change*		2018		2017		Change**
	(In millions)
Other expense (income), net:	$	0.9	$	(1.3	)	$	2.2	$	2.1	$	0.4	$	1.7

 * Primary reason for change. The increase was primarily due to a benefit of $1.3 million in unusual items (discussed below) and a benefit of $0.8 million in the three months ended June 30, 2017, related to the settlement of liabilities associated with the GDX Automotive business divestiture in 2004.

** Primary reason for change. The increase was primarily due to a benefit of $0.9 million in the six months ended June 30, 2017, in unusual items (discussed below) and a benefit of $0.8 million in the six months ended June 30, 2017, related to the settlement of liabilities associated with the GDX Automotive business divestiture in 2004.

Total unusual items, a component of other expense (income), net in the unaudited condensed consolidated statements of operations, were as follows:

34

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
	(In millions)
Unusual items
Legal related matters	$	—	$	(1.3	)	$	—	$	(1.9	)
Acquisition costs	—		—			—		1.0
	$	—	$	(1.3	)	$	—	$	(0.9	)

Three and six months ended June 30, 2017, activity:

During the three and six months ended June 30, 2017, we recorded $1.3 million and $1.9 million, respectively, of realized gains, net of interest associated with the failure to register with the SEC the issuance of certain of our common shares under our defined contribution 401(k) employee benefit plan.

During the six months ended June 30, 2017, we recorded $1.0 million of costs related to the acquisition of the Coleman Aerospace Business.

Retirement Benefits Expense:

	Three months ended June 30,									Six months ended June 30,
	2018			2017			Change*			2018			2017			Change*
	(In millions)
Components of retirement benefits expense:
Interest cost on benefit obligation	$	12.8		$	14.7		$	(1.9	)	$	25.5		$	29.5		$	(4.0	)
Assumed return on plan assets	(15.1		)	(12.4		)	(2.7		)	(30.1		)	(24.8		)	(5.3		)
Amortization of prior service credits	0.1			0.1			—			—			—			—
Recognized net actuarial losses	16.6			15.9			0.7			33.4			31.9			1.5
Retirement benefits expense	$	14.4		$	18.3		$	(3.9	)	$	28.8		$	36.6		$	(7.8	)

 * Primary reason for change. The decrease in retirement benefits expense was primarily due to better than expected investment returns on our pension plan assets and lower interest costs on the benefit obligation.

Interest Income:

	Three months ended June 30,						Six months ended June 30,
	2018		2017		Change*		2018		2017		Change*
	(In millions)
Interest income:	$	2.0	$	0.8	$	1.2	$	3.6	$	1.3	$	2.3

 * Primary reason for change. The increase in interest income was primarily due to higher average cash and marketable securities balances and interest rates.

Interest Expense:

	Three months ended June 30,						Six months ended June 30,
	2018		2017		Change*		2018		2017		Change*
	(In millions)
Components of interest expense:
Contractual interest and other	$	6.0	$	5.7	$	0.3	$	12.0	$	11.0	$	1.0
Amortization of debt discount and deferred financing costs	2.3		2.1		0.2		4.4		4.2		0.2
Interest expense	$	8.3	$	7.8	$	0.5	$	16.4	$	15.2	$	1.2

35

* Primary reason for change. The increase in interest expense was primarily due to a higher variable interest rate on our $750.0 million senior secured credit facility (the “Senior Credit Facility”) partially offset by a lower principal balance on the Senior Credit Facility. The Senior Credit Facility variable rate was 4.34% as of June 30, 2018, compared with 3.48% as of June 30, 2017.

Income Tax Provision:

The income tax provision was as follows:

	Six months ended June 30,
	2018		2017
	(In millions)
Income tax provision	$	17.2	$	15.2

In the six months ended June 30, 2018, the income tax provision was $17.2 million for an effective tax rate of 26.1%. Our effective tax rate differed from the 21% statutory federal income tax rate primarily due to state income taxes and certain expenditures which are permanently not deductible for tax purposes, partially offset by the impact of research and development (“R&D”) credits.

In the six months ended June 30, 2017, the income tax provision was $15.2 million for an effective tax rate of 33.5%. Our effective tax rate differed from the 35% statutory federal income tax rate primarily due to state income taxes and certain expenditures which are permanently not deductible for tax purposes, offset by the impact of R&D credits, tax benefits attributable to the expiration of statute of limitations and excess tax benefits from the exercise and vesting of stock-based compensation.

The significant increase in the current income tax payable during this reporting period relates to the impact of our adoption of the new revenue recognition guidance on January 1, 2018. In anticipation of this impact, we filed a non-automatic accounting method change request, Form 3115 Application for Change in Accounting Method, with the Internal Revenue Service (“IRS”) during the first quarter of 2018. The change in accounting method for tax purposes will provide for consistent recognition of costs of sales for both book and tax purposes, under certain circumstances. To the extent that we receive IRS consent, we expect that the current income tax payable and the corresponding deferred tax asset would decrease by approximately $105 million to $115 million. We believe that the increase in the current income tax payable is an unintended consequence of the new revenue recognition guidance and are optimistic that we will receive the IRS consent; however, no assurance can be given.

A valuation allowance is required when it is more-likely-than-not that all or a portion of deferred tax assets may not be realized. Assessing the need for a valuation allowance requires management to evaluate, on a quarterly basis, all available evidence, both positive and negative. As of June 30, 2018, we continue to believe that the weight of the positive evidence outweighed the negative evidence regarding the realization of our net deferred tax assets.

Operating Segment Information:

We evaluate our operating segments based on several factors, of which the primary financial measure is segment performance. Segment performance represents net sales less applicable costs, expenses and provisions for unusual items relating to the segment. Excluded from segment performance are: corporate income and expenses, interest expense, interest income, income taxes, and unusual items not related to the segment. We believe that segment performance provides information useful to investors in understanding our underlying operational performance. In addition, we provide the Non-GAAP financial measure of our operational performance called segment performance before environmental remediation provision adjustments, retirement benefits net of amounts that are recoverable under our U.S. government contracts, and segment unusual items. We believe the exclusion of the items listed above permits an evaluation and a comparison of results for ongoing business operations, and it is on this basis that management internally assesses operational performance.

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Aerospace and Defense Segment

	Three months ended June 30,									Six months ended June 30,
	2018			2017			Change*			2018			2017			Change**
	(In millions, except percentage amounts)
Net sales	$	465.6		$	458.0		$	7.6		$	956.0		$	861.7		$	94.3
Segment performance	67.3			56.2			11.1			101.6			90.9			10.7
Segment margin	14.5		%	12.3		%				10.6		%	10.5		%
Segment margin before environmental remediation provision adjustments, retirement benefits, net, and unusual items (Non-GAAP measure)	14.9		%	12.8		%				11.1		%	11.3		%
Components of segment performance:
Aerospace and Defense	$	69.5		$	58.8		$	10.7		$	106.1		$	97.0		$	9.1
Environmental remediation provision adjustments	(1.0		)	(0.5		)	(0.5		)	(2.3		)	(1.1		)	(1.2		)
GAAP/CAS retirement benefits expense difference	(1.2		)	(3.4		)	2.2			(2.2		)	(6.9		)	4.7
Unusual items	—			1.3			(1.3		)	—			1.9			(1.9		)
Aerospace and Defense total	$	67.3		$	56.2		$	11.1		$	101.6		$	90.9		$	10.7

Net sales was significantly impacted by the adoption of new revenue recognition guidance effective January 1, 2018, using the modified retrospective method. The primary impact of the new guidance was a change in the timing of revenue recognition on certain long-term contracts. Under this new guidance, we discontinued the use of the unit-of-delivery method on certain customer contracts and re-measured the performance obligations using the cost-to-cost method.

 * Primary reason for change. Net sales in the three months ended June 30, 2018, would have been $475.0 million under the previous revenue recognition guidance which is $17.0 million higher than the net sales reported in the three months ended June 30, 2017, resulting from an increase of $31.9 million in defense programs primarily driven by increased deliveries on the Standard Missile and PAC-3 programs. The increase in net sales was partially offset by a decrease of $14.9 million in space programs. The Atlas V program, which concludes in the third quarter of 2018, contributed sales of $13.1 million under the new revenue recognition guidance in the three months ended June 30, 2018, and sales of $29.6 million under the previous revenue recognition guidance in the three months ended June 30, 2018.

The increase in segment margin before environmental remediation provision adjustments, retirement benefits, net and unusual items was primarily driven by risk retirements on the RS-25 program and better than expected overhead rate performance, partially offset by favorable contract performance on the THAAD program in 2017 as a result of risk retirements and cost reductions.

During the three months ended June 30, 2018, we had $22.0 million of favorable changes in contract estimates on operating results before income taxes compared with favorable changes of $10.3 million during the three months ended June 30, 2017.

** Primary reason for change. Net sales in the six months ended June 30, 2018, would have been $942.8 million under the previous revenue recognition guidance which is $81.1 million higher than the net sales reported in the six months ended June 30, 2017, resulting from an increase of $117.3 million in defense programs primarily driven by increased deliveries on the Standard Missile, PAC-3, and THAAD programs. The increase in net sales was partially offset by a decrease of $36.2 million in space programs primarily driven by performance issues on the Commercial Crew Development program and lower deliveries on the Atlas V program. The Atlas V program, which concludes in the third quarter of 2018, contributed sales of $32.3 million under the new revenue recognition guidance in the six months ended June 30, 2018, and sales of $44.6 million under the previous revenue recognition guidance in the six months ended June 30, 2018.

The small decline in the segment margin before environmental remediation provision adjustments, retirement benefits, net and unusual items was primarily due to cost growth and performance issues in the current period on the Commercial Crew Development program and favorable contract performance in the prior period on the THAAD program, partially offset by risk retirements on the RS-25 program and better than expected overhead rate performance.

37

During the six months ended June 30, 2018, we had $14.1 million of favorable changes in contract estimates on operating results before income taxes compared with favorable changes of $13.7 million during the six months ended June 30, 2017.

As of June 30, 2018, our total remaining performance obligations, also referred to as backlog, totaled $3.9 billion. We expect to recognize approximately 48%, or $1.9 billion, of the remaining performance obligations as sales over the next twelve months, an additional 28% the following twelve months, and 24% thereafter. A summary of our backlog is as follows:

	June 30, 2018		December 31, 2017
	(In billions)
Funded backlog	$	1.5	$	2.1
Unfunded backlog	2.4		2.5
Total backlog	$	3.9	$	4.6

Our adoption of the new revenue recognition guidance accelerated the timing of revenue recognition on some of our contracts which resulted in a $0.6 billion reduction in total backlog. Total backlog includes both funded backlog (unfilled orders for which funding is authorized, appropriated and contractually obligated by the customer) and unfunded backlog (firm orders for which funding has not been appropriated). Indefinite delivery and quantity contracts and unexercised options are not reported in total backlog. Backlog is subject to funding delays or program restructurings/cancellations which are beyond our control.

Real Estate Segment

	Three months ended June 30,							Six months ended June 30,
	2018		2017		Change*			2018		2017		Change*
	(In millions)
Net sales	$	1.6	$	1.6	$	—		$	3.2	$	3.2	$	—
Segment performance	0.6		0.8		(0.2		)	1.2		1.6		(0.4		)

* Primary reason for change. Net sales and segment performance consist primarily of rental property operations.

Use of Non-GAAP Financial Measures

In addition to segment performance (discussed above), we provide the Non-GAAP financial measure of our operational performance called Adjusted EBITDAP. We use this metric to measure our operating performance. We believe that to effectively compare core operating performance from period to period, the metric should exclude items relating to retirement benefits (pension and postretirement benefits), significant non-cash expenses, the impacts of financing decisions on earnings, and items incurred outside the ordinary, on-going and customary course of our operations. Accordingly, we define Adjusted EBITDAP as GAAP net income adjusted to exclude income taxes, interest expense, interest income, depreciation and amortization, retirement benefits net of amounts that are recoverable under our U.S. government contracts, and unusual items which we do not believe are reflective of such ordinary, on-going and customary activities. Adjusted EBITDAP does not represent, and should not be considered an alternative to, net income as determined in accordance with GAAP.

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
	(In millions, except percentage amounts)
Net income	$	34.8		$	24.3		$	48.8		$	30.2
Income tax provision	12.5			11.9			17.2			15.2
Interest expense	8.3			7.8			16.4			15.2
Interest income	(2.0		)	(0.8		)	(3.6		)	(1.3		)
Depreciation and amortization	17.7			19.1			35.4			35.4
GAAP retirement benefits expense	14.4			18.3			28.8			36.6
CAS recoverable retirement benefits expense	(9.9		)	(9.9		)	(20.0		)	(19.7		)
Unusual items	—			(1.3		)	—			(0.9		)
Adjusted EBITDAP	$	75.8		$	69.4		$	123.0		$	110.7
Net income as a percentage of net sales	7.4		%	5.3		%	5.1		%	3.5		%
Adjusted EBITDAP as a percentage of net sales	16.2		%	15.1		%	12.8		%	12.8		%

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We also provide the Non-GAAP financial measure of Free Cash Flow. Free Cash Flow, a Non-GAAP financial measure, is defined as cash flow from operating activities less capital expenditures. Free Cash Flow should not be considered in isolation, as a measure of residual cash flow available for discretionary purposes, or as an alternative to cash flows from operations presented in accordance with GAAP. We use Free Cash Flow, both in presenting our results to stakeholders and the investment community, and in our internal evaluation and management of the business. Management believes that this financial measure is useful because it provides supplemental information to assist investors in viewing the business using the same tools that management uses to evaluate progress in achieving our goals (including under our annual cash and long-term compensation incentive plans).

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
	(In millions)
Net cash provided by operating activities	$	119.9		$	40.8		$	24.5		$	37.7
Capital expenditures	(8.1		)	(3.4		)	(12.2		)	(6.1		)
Free Cash Flow	$	111.8		$	37.4		$	12.3		$	31.6

Because our method for calculating these Non-GAAP measures may differ from other companies’ methods, the Non-GAAP measures presented above may not be comparable to similarly titled measures reported by other companies. These measures are not recognized in accordance with GAAP, and we do not intend for this information to be considered in isolation or as a substitute for GAAP measures.

Other Information

Recently Adopted Accounting Pronouncements

See Note 1 of the Notes to Unaudited Condensed Consolidated Financial Statements for information relating to our discussion of the effects of recent accounting pronouncements.

Critical Accounting Policies and Estimates

Our financial statements are prepared in accordance with GAAP that offer acceptable alternative methods for accounting for certain items affecting our financial results, such as determining inventory cost, depreciating long-lived assets, and recognizing revenues.

The preparation of financial statements requires the use of estimates, assumptions, judgments, and interpretations that can affect the reported amounts of assets, liabilities, revenues, and expenses, the disclosure of contingent assets and liabilities and other supplemental disclosures. The development of accounting estimates is the responsibility of our management. Management discusses those areas that require significant judgment with the audit committee of our board of directors. All of our financial disclosures in our filings with the SEC have been reviewed with the audit committee. Although we believe that the positions we have taken with regard to uncertainties are reasonable, others might reach different conclusions and our positions can change over time as more information becomes available. If an accounting estimate changes, its effects are accounted for prospectively and, if significant, disclosed in the Notes to Unaudited Condensed Consolidated Financial Statements.

The areas most affected by our accounting policies and estimates are revenue recognition, other contract considerations, goodwill, retirement benefit plans, litigation, environmental remediation costs and recoveries, and income taxes. Except for income taxes and litigation matters related to legacy operations, which are not allocated to our operating segments, these areas affect the financial results of our business segments.

See Notes 3 and 13 of the Notes to Unaudited Condensed Consolidated Financial Statements for the impact of the change in significant contract accounting estimates on our net sales and adoption of the new revenue recognition guidance effective January 1, 2018. In addition, see Notes 1 and 10 of the Notes to Unaudited Condensed Consolidated Financial Statements for the adoption of new guidance related to the presentation of retirement benefits expense effective January 1, 2018.

A detailed description of our significant accounting policies can be found in our most recent Annual Report on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017.

39

Contractual Obligations:

We have contractual obligations and commitments in the form of debt, leases, purchase obligations, certain other liabilities, and other commitments. The following table summarizes our contractual obligations as of December 31, 2017:

	Payments due by period
	Total		Less than 1 year		1-3 years		3-5 years		After 5 years
	(In millions)
Contractual Obligations:
Long-term debt:
Senior debt	$	370.0	$	25.0	$	65.0	$	280.0	$	—
Convertible senior notes	300.0		—		—		—		300.0
Capital lease obligations	0.9		0.2		0.4		0.3		—
Interest on long-term debt (1)	84.5		20.7		38.2		19.1		6.5
Huntsville building commitments	83.1		2.2		7.4		7.5		66.0
Outsourced information technology commitment	121.9		29.4		52.7		39.8		—
Postretirement medical and life insurance benefits (2)	33.6		4.8		8.7		7.4		12.7
Purchase obligations (3)	1,142.9		826.8		299.9		16.1		0.1
Operating leases	95.1		15.1		28.7		27.4		23.9
Conditional asset retirement obligations (4)	44.0		1.3		2.6		17.6		22.5
Total	$	2,276.0	$	925.5	$	503.6	$	415.2	$	431.7

________

(1) Includes interest on variable debt calculated based on interest rates at December 31, 2017.

(2) The payments presented above are expected payments for the next 10 years. The payments for postretirement medical and life insurance benefits reflect the estimated benefit payments of the plans using the provisions currently in effect. The obligation related to postretirement medical and life insurance benefits is actuarially determined on an annual basis. A substantial portion of these amounts are recoverable through our contracts with the U.S. government.

(3) Purchase obligations represent open purchase orders and other commitments to suppliers, subcontractors, and other outsourcing partners for equipment, materials, and supplies in the normal course of business. These amounts are based on volumes consistent with anticipated requirements to fulfill purchase orders or contracts for product deliveries received, or expected to be received, from customers. A substantial portion of these amounts are recoverable through our contracts with the U.S. government.

(4) The conditional asset retirement obligations presented are related to our Aerospace and Defense segment and are allowable costs under our contracts with the U.S. government.

Arrangements with Off-Balance Sheet Risk

See Note 8(d) of the Notes to Unaudited Condensed Consolidated Financial Statements for off-balance sheet risk.

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Liquidity and Capital Resources

Net Cash Provided by (Used in) Operating, Investing, and Financing Activities

The change in cash and cash equivalents was as follows:

	Six months ended June 30,
	2018			2017
	(In millions)
Income before income taxes	$	66.0		$	45.4
Non-cash expenses:
Depreciation and amortization	35.4			35.4
Amortization of debt discount and deferred financing costs	4.4			4.2
Stock-based compensation	6.7			10.2
Retirement benefits non-cash expense	28.8			36.6
Insurance proceeds	(1.9		)	—
Other, net	(0.1		)	0.3
Total non-cash expenses	73.3			86.7
Income before income taxes adjusted for non-cash items	139.3			132.1
Working capital (accounts receivable, inventories, contract assets and liabilities, current assets and liabilities, environmental recoveries and reserves, and accounts payable)	(80.3		)	(65.3		)
Retirement benefits cash funding	(22.1		)	(21.2		)
Other	(12.4		)	(7.9		)
Net Cash Provided by Operating Activities	24.5			37.7
Net Cash Used in Investing Activities	(34.9		)	(21.1		)
Net Cash Used in Financing Activities	(9.9		)	(13.3		)
Net (Decrease) Increase in Cash and Cash Equivalents	$	(20.3	)	$	3.3

Net Cash Provided by Operating Activities

The $13.2 million decrease in cash provided by operating activities for the six months ended June 30, 2018, compared with the six months ended June 30, 2017, was primarily due to cash usage from working capital of $15.0 million partially offset by $7.2 million of improved operating results. The increased cash usage from working capital was primarily due to (i) higher net cash income tax refunds in the prior period; (ii) a decrease in accounts payable due to vendor payment schedules; and (iii) a decrease in contract liabilities primarily due to the timing of cash advances from customers on long-term contracts. These factors were partially offset by the collection of $35.0 million of cash in the three months ended June 30, 2018, as a result of the modification in June 2018 to the AR1 Other Transaction Agreement (“OTA”) with the U.S. Air Force.

Net Cash Used In Investing Activities

During the six months ended June 30, 2018 and 2017, we had capital expenditures of $12.2 million and $6.1 million, respectively.

During the six months ended June 30, 2018, we received insurance proceeds of $1.9 million and we made a net cash investment of $24.6 million in marketable securities.

During the six months ended June 30, 2017, we purchased Coleman Aerospace for $15.0 million.

Net Cash Used in Financing Activities

During the six months ended June 30, 2018 and 2017, we had debt repayments of $10.3 million and $10.0 million, respectively.

Debt Activity and Covenants

Our debt principal activity since December 31, 2017, was as follows:

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	December 31, 2017		Cash Payments			Non-cash Activity		June 30, 2018
	(In millions)
Term loan	$	370.0	$	(10.0	)	$	—	$	360.0
2 1/4% Notes	300.0		—			—		300.0
Capital leases	0.9		(0.3		)	1.2		1.8
Total Debt and Borrowing Activity	$	670.9	$	(10.3	)	$	1.2	$	661.8

We were in compliance with our financial and non-financial covenants under the Senior Credit Facility as of June 30, 2018.

Outlook

Short-term liquidity requirements consist primarily of recurring operating expenses, including but not limited to costs related to our capital and environmental expenditures, company-funded R&D expenditures, debt service requirements, and retirement benefit plans. We believe that our existing cash and cash equivalents, marketable securities, and availability under the Senior Credit Facility coupled with cash generated from our future operations will provide sufficient funds to meet our operating plan for the next twelve months. The operating plan for this period provides for full operation of our businesses, and interest and principal payments on our debt. As of June 30, 2018, we had $514.7 million of cash and cash equivalents and $44.9 million of marketable securities as well as $311.6 million of available borrowings under our Senior Credit Facility. Based on our existing debt agreements, we were in compliance with our financial and non-financial covenants as of June 30, 2018. Our failure to comply with these covenants could result in an event of default that, if not cured or waived by the lenders, could result in the acceleration of the Senior Credit Facility and 2¼% Notes. In addition, our failure to pay principal and interest when due is a default under the Senior Credit Facility, and in certain cases, would cause a cross default on the 2¼% Notes.

Major factors that could adversely impact our forecasted operating cash and our financial condition are described in the section “Risk Factors” in Item 1A of our Annual Report to the SEC on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017.

Forward-Looking Statements

Certain information contained in this report should be considered “forward-looking statements” as defined by Section 21E of the Private Securities Litigation Reform Act of 1995. All statements in this report other than historical information may be deemed forward-looking statements. These statements present (without limitation) the expectations, beliefs, plans and objectives of management and future financial performance and assumptions underlying, or judgments concerning, the matters discussed in the statements. The words “believe,” “estimate,” “anticipate,” “project” and “expect,” and similar expressions, are intended to identify forward-looking statements. Forward-looking statements involve certain risks, estimates, assumptions and uncertainties, including with respect to future sales and activity levels, cash flows, contract performance, the outcome of litigation and contingencies, environmental remediation and anticipated costs of capital. A variety of factors could cause actual results or outcomes to differ materially from those expected and expressed in our forward-looking statements. Important risk factors that could cause actual results or outcomes to differ from those expressed in the forward-looking statements are described in the section “Risk Factors” in Item 1A of our Annual Report to the SEC on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017, include the following:

• future reductions or changes in U.S. government spending;

• cancellation or material modification of one or more significant contracts;

• cost overruns on the Company's contracts that require the Company to absorb excess costs;

• failure of the Company's subcontractors or suppliers to perform their contractual obligations;

• failure to secure contracts;

• failure to comply with regulations applicable to contracts with the U.S. government;

• failure to comply with applicable laws, including laws relating to export controls and anti-corruption or bribery laws;

• the Company's Competitive Improvement Program may not be successful in aligning the Company's operations to current market conditions or in achieving the anticipated costs savings and other benefits within the expected timeframes;

• costs and time commitment related to potential and/or actual acquisition activities may exceed expectations;

• the Company's inability to adapt to rapid technological changes;

• failure of the Company's information technology infrastructure, including a successful cyber-attack, accident, unsuccessful outsourcing of certain information technology and cyber security functions, or security breach that could result in disruptions to the Company's operations;

• product failures, schedule delays or other problems with existing or new products and systems;

42

• the release, unplanned ignition, explosion, or improper handling of dangerous materials used in the Company's businesses;

• loss of key qualified suppliers of technologies, components, and materials;

• the funded status of the Company's defined benefit pension plan and the Company's obligation to make cash contributions in excess of the amount that the Company can recover in its current period overhead rates;

• effects of changes in discount rates and actuarial estimates, actual returns on plan assets, and government regulations on defined benefit pension plans;

• the possibility that environmental and other government regulations that impact the Company become more stringent or subject the Company to material liability in excess of its established reserves;

• environmental claims related to the Company's current and former businesses and operations including the inability to protect or enforce previously executed environmental agreements;

• reductions in the amount recoverable from environmental claims;

• significant risk exposures and potential liabilities that are inadequately covered by indemnity or insurance;

• inability to protect the Company's patents and proprietary rights;

• business disruptions to the extent not covered by insurance;

• the substantial amount of debt that places significant demands on the Company's cash resources and could limit the Company's ability to borrow additional funds or expand its operations;

• the Company's ability to comply with the financial and other covenants contained in the Company's debt agreements;

• risks inherent to the real estate market;

• changes in economic and other conditions in the Sacramento, California metropolitan area real estate market or changes in interest rates affecting real estate values in that market;

• additional costs related to past or future divestitures;

• the loss of key employees and shortage of available skilled employees to achieve anticipated growth;

• a strike or other work stoppage or the Company's inability to renew collective bargaining agreements on favorable terms;

• fluctuations in sales levels causing the Company's quarterly operating results and cash flows to fluctuate;

• restatement of previously issued consolidated financial statements may lead to additional risks and uncertainties;

• failure to maintain effective internal controls in accordance with the Sarbanes-Oxley Act; and

• those risks detailed in the Company's reports filed with the SEC.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

There have been no material changes to our disclosures related to certain market risks as reported under Part II, Item 7A, “Quantitative and Qualitative Disclosures About Market Risk,” in our Annual Report to the SEC on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017.

Interest Rate Risk

We are exposed to market risk principally due to changes in interest rates. Debt with interest rate risk includes borrowings under our Senior Credit Facility. Other than pension assets and liabilities, we do not have any significant exposure to interest rate risk related to our investments.

As of June 30, 2018, our debt principal amounts totaled $661.8 million: $301.8 million, or 46%, was at a fixed rate of 2.26%; and $360.0 million, or 54%, was at a variable rate of 4.34%.

The estimated fair value and principal amount of our outstanding debt is presented below:

	Fair Value				Principal Amount
	June 30, 2018		December 31, 2017		June 30, 2018		December 31, 2017
	(In millions)
Term loan	$	360.0	$	370.0	$	360.0	$	370.0
2 1/4% Notes	388.9		415.3		300.0		300.0
Capital leases	1.8		0.9		1.8		0.9
	$	750.7	$	786.2	$	661.8	$	670.9

43

The fair value of the 2 ¹/₄% Notes was determined using broker quotes that are based on open markets for our debt securities (Level 2 securities). The term loan bore interest at variable rates, which adjusted based on market conditions, and its carrying value approximated fair value.

Item 4. Controls and Procedures

Evaluation of disclosure controls and procedures

Based on our management’s evaluation (with the participation of our principal executive officer and principal financial officer), as of the end of the period covered by this report, our principal executive officer and principal financial officer have concluded that our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) are effective to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms and is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in internal control over financial reporting

There were no changes in internal control over financial reporting that occurred during the most recent quarter that have materially affected, or are reasonably likely to materially affect, the effectiveness of our internal control over financial reporting.

44

PART II — OTHER INFORMATION

Item 1. Legal Proceedings

Except as disclosed in Note 8 of the Notes to Unaudited Condensed Consolidated Financial Statements, which is incorporated herein by reference, there have been no significant developments in the pending legal proceedings as previously reported in Part 1, Item 3, Legal Proceedings in our Annual Report on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017.

Item 1A. Risk Factors

There have been no material changes from our risk factors as previously reported in our Annual Report to the SEC on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3. Defaults upon Senior Securities

None.

Item 4. Mine safety disclosures

Not applicable.

Item 5. Other Information

None.

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Item 6. Exhibits

No.	Description
10.1	2018 Equity and Performance Incentive Plan (incorporated by reference to Exhibit A of the Registrant’s Definitive Proxy Statement on Schedule 14A filed on March 29, 2018).
10.2	Form of Restricted Stock Agreement between the Company and Employees for time-based grants under the 2018 Equity and Performance Incentive Plan (incorporated by reference to Exhibit 99.2 of the Registrant's Registration Statement on Form S-8 filed on May 10, 2018).
10.3	Form of Restricted Stock Agreement between the Company and Employees for performance-based grants under the 2018 Equity and Performance Incentive Plan (incorporated by reference to Exhibit 99.3 of the Registrant's Registration Statement on Form S-8 filed on May 10, 2018).
10.4	Form of Unrestricted Stock Agreement between the Company and Directors for grants under the 2018 Equity and Performance Incentive Plan (incorporated by reference to Exhibit 99.4 of the Registrant's Registration Statement on Form S-8 filed on May 10, 2018).
10.5	Form of Restricted Stock Agreement between the Company and Directors for matching share grants under the 2018 Equity and Performance Incentive Plan (incorporated by reference to Exhibit 99.5 of the Registrant's Registration Statement on Form S-8 filed on May 10, 2018).
10.6	Form of Restricted Stock Agreement between the Company and Directors for annual share grants under the 2018 Equity and Performance Incentive Plan (incorporated by reference to Exhibit 99.6 of the Registrant's Registration Statement on Form S-8 filed on May 10, 2018).
10.7	Form of Stock Appreciation Rights Agreement between the Company and Employees for grants under the 2018 Equity and Performance Incentive Plan (incorporated by reference to Exhibit 99.7 of the Registrant's Registration Statement on Form S-8 filed on May 10, 2018).
31.1*	Certification of Principal Executive Officer pursuant to Rule 13a — 14(a) of the Securities Exchange Act of 1934, as amended.
31.2*	Certification of Principal Financial Officer pursuant to Rule 13a — 14(a) of the Securities Exchange Act of 1934, as amended.
32.1*	Certification of Principal Executive Officer and Principal Financial Officer pursuant to Rule 13a — 14(b) of the Securities and Exchange Act of 1934, as amended, and 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101*	The following materials from the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2018, formatted in XBRL (Extensible Business Reporting Language): (i) Unaudited Condensed Consolidated Statements of Operations, (ii) Unaudited Condensed Consolidated Statements of Comprehensive Income, (iii) Unaudited Condensed Consolidated Balance Sheets, (iv) Unaudited Condensed Consolidated Statement of Stockholders’ Equity, (v) Unaudited Condensed Consolidated Statements of Cash Flows, and (vi) Unaudited Notes to Unaudited Condensed Consolidated Financial Statements.

_______

* Filed herewith.

46

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		Aerojet Rocketdyne Holdings, Inc.
Date:	July 30, 2018	By:	/s/ Eileen P. Drake
			Eileen P. Drake
			Chief Executive Officer and President
			(Principal Executive Officer)
Date:	July 30, 2018	By:	/s/ Paul R. Lundstrom
			Paul R. Lundstrom
			Vice President and Chief Financial Officer
			(Principal Financial Officer)
Date:	July 30, 2018	By:	/s/ Daniel L. Boehle
			Daniel L. Boehle
			Vice President and Controller
			(Principal Accounting Officer)

47

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Eileen P. Drake, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Aerojet Rocketdyne Holdings, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 30, 2018

/s/ Eileen P. Drake

Eileen P. Drake

Chief Executive Officer and President

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Paul R. Lundstrom, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Aerojet Rocketdyne Holdings, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 30, 2018

/s/ Paul R. Lundstrom

Paul R. Lundstrom

Vice President and Chief Financial Officer

(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATIONS

PURSUANT TO 18 UNITED STATES CODE §1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned hereby certifies that to her knowledge the quarterly report on Form 10-Q of Aerojet Rocketdyne Holdings, Inc. for the period ended June 30, 2018 (the Report), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of the operations of the Company, as of the dates and the periods expressed in the Report.

/s/ Eileen P. Drake

Eileen P. Drake

Chief Executive Officer and President

(Principal Executive Officer)

Date: July 30, 2018

The undersigned hereby certifies that to his knowledge the quarterly report on Form 10-Q of Aerojet Rocketdyne Holdings, Inc. for the period ended June 30, 2018 (the Report), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of the operations of the Company, as of the dates and the periods expressed in the Report.

/s/ Paul R. Lundstrom

Paul R. Lundstrom

Vice President and Chief Financial Officer

(Principal Financial Officer)

Date: July 30, 2018

XML

Document and Entity Information - shares shares in Millions	6 Months Ended
	Jun. 30, 2018	Jul. 24, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Trading Symbol	AJRD
Entity Registrant Name	AEROJET ROCKETDYNE HOLDINGS, INC.
Entity Central Index Key	0000040888
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		75.6

XML

Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Net sales	$ 467.2	$ 459.6	$ 959.2	$ 864.9
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	369.5	370.6	796.3	710.0
Selling, general and administrative expense	11.1	9.7	17.8	23.2
Depreciation and amortization	17.7	19.1	35.4	35.4
Other expense (income), net	0.9	(1.3)	2.1	0.4
Total operating costs and expenses	399.2	398.1	851.6	769.0
Operating income	68.0	61.5	107.6	95.9
Non-operating (income) expense:
Retirement benefits expense	14.4	18.3	28.8	36.6
Interest income	(2.0)	(0.8)	(3.6)	(1.3)
Interest expense	8.3	7.8	16.4	15.2
Total non-operating expense, net	20.7	25.3	41.6	50.5
Income before income taxes	47.3	36.2	66.0	45.4
Income tax provision	12.5	11.9	17.2	15.2
Net income	$ 34.8	$ 24.3	$ 48.8	$ 30.2
Basic
Net favorable effect of the changes in contract estimates on basic net income per share	$ 0.46	$ 0.32	$ 0.65	$ 0.41
Diluted
Net favorable effect of the changes in contract estimates on diluted net income per share	$ 0.45	$ 0.32	$ 0.64	$ 0.41
Weighted average shares of common stock outstanding, basic (in shares)	73.9	73.2	73.8	72.6
Weighted average shares of common stock outstanding, diluted (in shares)	75.1	73.2	75.0	72.7

XML

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 34.8	$ 24.3	$ 48.8	$ 30.2
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes of $4.2 million, $6.2 million, $8.4 million, and $12.4 million	12.5	9.4	25.0	19.1
Comprehensive income	47.3	33.7	73.8	49.3
Income taxes related to defined benefit plan	$ 4.2	$ 6.2	$ 8.4	$ 12.4

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Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current Assets
Cash and cash equivalents	$ 514.7	$ 535.0
Marketable securities	44.9	20.0
Accounts receivable	134.6	64.5
Contract assets	253.1	268.1
Other current assets, net	123.2	129.1
Total Current Assets	1,070.5	1,016.7
Noncurrent Assets
Property, plant and equipment, net	357.8	359.0
Recoverable environmental remediation costs	225.8	231.1
Deferred income taxes	255.5	145.8
Goodwill	161.3	161.3
Intangible assets	78.7	85.5
Other noncurrent assets, net	260.5	259.3
Total Noncurrent Assets	1,339.6	1,242.0
Total Assets	2,410.1	2,258.7
Current Liabilities
Current portion of long-term debt	30.4	25.0
Accounts payable	104.1	100.9
Reserves for environmental remediation costs	34.6	35.2
Contract liabilities	185.3	276.8
Other current liabilities	313.0	156.9
Total Current Liabilities	667.4	594.8
Noncurrent Liabilities
Long-term debt	581.0	591.4
Reserves for environmental remediation costs	299.1	306.2
Pension benefits	467.8	492.8
Other noncurrent liabilities	174.7	171.1
Total Noncurrent Liabilities	1,522.6	1,561.5
Total Liabilities	2,190.0	2,156.3
Commitments and contingencies (Note 8)
Stockholders’ Equity
Preference stock, par value of $1.00; 15.0 million shares authorized; none issued or outstanding	0.0	0.0
Common stock, par value of $0.10; 150.0 million shares authorized; 73.9 million shares issued and outstanding as of June 30, 2018; 73.6 million shares issued and outstanding as of December 31, 2017	7.4	7.4
Other capital	509.4	503.1
Treasury stock at cost, 3.5 million shares as of June 30, 2018 and December 31, 2017	(64.5)	(64.5)
Retained earnings (accumulated deficit)	15.4	(71.0)
Accumulated other comprehensive loss, net of income taxes	(247.6)	(272.6)
Total Stockholders’ Equity	220.1	102.4
Total Liabilities and Stockholders’ Equity	$ 2,410.1	$ 2,258.7

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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preference stock, par value (in USD per share)	$ 1.00	$ 1.00
Preference stock, shares authorized (in shares)	15,000,000	15,000,000
Preference stock, shares issued (in shares)	0	0
Preference stock, shares outstanding (in shares)	0	0
Common stock, par value (in USD per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	73,900,000	73,600,000
Common stock, shares outstanding (in shares)	73,900,000	73,600,000
Treasury stock, shares (in shares)	3,500,000	3,500,000

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Condensed Consolidated Statement of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Other Capital	Treasury Stock	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of change in accounting guidance | ASU 2014-09	$ 37.6				$ 37.6
Beginning balance (in shares) at Dec. 31, 2017		73.6
Beginning balance at Dec. 31, 2017	102.4	$ 7.4	$ 503.1	$ (64.5)	(71.0)	$ (272.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48.8				48.8
Amortization of actuarial losses and prior service credits, net of income taxes	25.0					25.0
Repurchase of shares for withholding taxes and option costs under employee equity plans (in shares)		(0.1)
Repurchase of shares for withholding taxes and option costs under employee equity plans	(2.1)		(2.1)
Stock-based compensation and other, net (in shares)		0.4
Stock-based compensation and shares issued under equity plans	8.4	$ 0.0	8.4
Ending balance (in shares) at Jun. 30, 2018		73.9
Ending balance at Jun. 30, 2018	$ 220.1	$ 7.4	$ 509.4	$ (64.5)	$ 15.4	$ (247.6)

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income	$ 48.8	$ 30.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35.4	35.4
Amortization of debt discount and deferred financing costs	4.4	4.2
Stock-based compensation	6.7	10.2
Retirement benefits, net	6.7	15.4
Insurance proceeds	(1.9)	0.0
Other, net	(0.1)	0.3
Changes in assets and liabilities, net of effects from acquisition in 2017:
Accounts receivable	(40.7)	(50.3)
Contract assets	(7.5)	(9.7)
Other current assets, net	16.3	12.2
Recoverable environmental remediation costs	5.3	10.1
Other noncurrent assets	(1.5)	(31.5)
Accounts payable	(9.7)	12.6
Contract liabilities	(58.1)	(43.0)
Other current liabilities	21.8	13.6
Deferred income taxes	2.3	15.9
Reserves for environmental remediation costs	(7.7)	(10.8)
Other noncurrent liabilities and other	4.0	22.9
Net Cash Provided by Operating Activities	24.5	37.7
Investing Activities
Purchases of marketable securities	(44.7)	0.0
Sales of marketable securities	20.1	0.0
Purchase of Coleman Aerospace	0.0	(15.0)
Insurance proceeds	1.9	0.0
Capital expenditures	(12.2)	(6.1)
Net Cash Used in Investing Activities	(34.9)	(21.1)
Financing Activities
Debt repayments	(10.3)	(10.0)
Repurchase of shares for withholding taxes and option costs under employee equity plans	(2.1)	(5.7)
Proceeds from shares issued under equity plans	2.5	2.4
Net Cash Used in Financing Activities	(9.9)	(13.3)
Net (Decrease) Increase in Cash and Cash Equivalents	(20.3)	3.3
Cash and Cash Equivalents at Beginning of Period	535.0	410.3
Cash and Cash Equivalents at End of Period	514.7	413.6
Supplemental disclosures of cash flow information
Cash paid for interest	11.9	11.4
Cash paid for income taxes	15.2	0.5
Cash refund for income taxes	4.6	21.3
Conversion of debt to common stock	0.0	35.6
Non-cash fixed asset additions and capital leases	$ 14.2	$ 0.2

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Basis of Presentation and Nature of Operations

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation and Nature of Operations

Basis of Presentation and Nature of Operations

Aerojet Rocketdyne Holdings, Inc. (“Aerojet Rocketdyne Holdings” or the “Company”) has prepared the accompanying unaudited condensed consolidated financial statements, including its accounts and the accounts of its wholly-owned subsidiaries, in accordance with the instructions to Form 10-Q. The December 31, 2017, condensed consolidated balance sheet was derived from audited financial statements, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). These interim financial statements should be read in conjunction with the financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017. Certain reclassifications have been made to financial information for the prior year to conform to the current year’s presentation (see “Recently Adopted Accounting Pronouncements” below and Note 13).

The Company believes the accompanying unaudited condensed consolidated financial statements reflect all adjustments, including normal recurring accruals, necessary for a fair statement of its financial position, results of operations, and cash flows for the periods presented. All significant intercompany balances and transactions have been eliminated in consolidation. The preparation of the unaudited condensed consolidated financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the amounts reported in the unaudited condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates. In addition, the operating results for interim periods may not be indicative of the results of operations for a full year.

The Company’s operations are organized into two segments:

Aerospace and Defense — includes the operations of the Company’s wholly-owned subsidiary Aerojet Rocketdyne, Inc. (“Aerojet Rocketdyne”), a leading technology-based designer, developer and manufacturer of aerospace and defense products and systems for the United States (“U.S.”) government, including the Department of Defense (“DoD”), the National Aeronautics and Space Administration (“NASA”), and major aerospace and defense prime contractors.

Real Estate — includes the activities of the Company’s wholly-owned subsidiary Easton Development Company, LLC (“Easton”) related to the re-zoning, entitlement, sale, and leasing of the Company’s excess real estate assets. The Company is currently in the process of seeking zoning changes and other governmental approvals on its excess real estate assets to optimize their value.

A detailed description of the Company’s significant accounting policies can be found in the Company’s most recent Annual Report on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017.

AR1 Research and Development

Company-sponsored research and development (“R&D”) expenses (reported as a component of cost of sales) are generally reimbursed via allocation of such expenses among all contracts and programs in progress under U.S. government contractual arrangements. The Company's newest large liquid booster engine development project, the AR1, accounted for $56.1 million of such reimbursable costs from its inception through June 30, 2018. In February 2016, pursuant to an Other Transaction Agreement (“OTA”), the U.S. Air Force selected Aerojet Rocketdyne and United Launch Alliance (“ULA”) to share in a public-private partnership to develop jointly the AR1 engine under an agreement valued at $804.0 million with the U.S. Air Force investing two-thirds of the funding required to complete development of the AR1 engine by December 2019. In June 2018, the Company and the U.S. Air Force signed a modification to the existing OTA to modify the scope, funding, cost share, and period of performance of the AR1 engine. The modified OTA is valued at $353.8 million with the U.S. Air Force investing five-sixths of the funding required to design, build, and assemble a single AR1 engine prototype by December 2019. The U.S. Air Force contributions are recognized proportionately as an offset to R&D expenses. The AR1 inception to date, beginning in 2015, project costs at June 30, 2018, were as follows (in millions):

AR1 R&D costs incurred	$	290.1
Less amounts funded by the U.S. Air Force	(192.3		)
Less amounts funded by ULA	(9.6		)
AR1 R&D costs net of reimbursements	$	88.2

Of the $88.2 million AR1 investment, $32.1 million was expensed and $56.1 million was applied to the Company's contracts. The $6.7 million applied to the Company’s contracts in the three months ended March 31, 2018, was adjusted as a result of the modification discussed above such that no costs have been applied to the Company's contracts during the six months ended June 30, 2018. The Company’s cash contributions to this OTA are now complete.

Recently Adopted Accounting Pronouncements

In March 2016, the Financial Accounting Standards Board (“FASB”) amended the existing accounting guidance related to stock compensation. The amendment requires all income tax effects of awards to be recognized in the income statement when awards vest and allows a choice to account for forfeitures on an estimated or actual basis. There is also a requirement to present excess income tax benefits as an operating activity on the statement of cash flows. Effective January 1, 2017, the Company adopted the amendment requiring recognition of excess tax benefits and tax deficiencies in the income statement prospectively. In addition, the Company elected to change its accounting policy to account for forfeitures when they occur for consistency with the U.S. government recovery accounting practices on a modified retrospective basis. The Company also elected to adopt the amendment related to the presentation of excess tax benefits within operating activities on the statement of cash flows, retrospectively.

In January 2017, the FASB issued an amendment to the accounting guidance related to goodwill impairment. The update eliminates “Step 2” which involves determining the implied fair value of goodwill and comparing it to the carrying amount of goodwill to measure the goodwill impairment loss, if any. The quantitative assessment “Step 1” will be used to determine both the existence and amount of goodwill impairment. The standard should be applied on a prospective basis and is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted this new accounting guidance in conjunction with its annual impairment test on October 1, 2017. The adoption did not have an impact on the Company's financial position, results of operations, or cash flows.

In August 2016, the FASB issued an amendment to the accounting guidance related to classification of certain cash receipts and cash payments in the statement of cash flows. The standard provides guidance for eight targeted changes with respect to how cash receipts and cash payments are classified in the statement of cash flows, with the objective of reducing diversity in practice. The Company adopted this new accounting guidance on December 31, 2017. The adoption did not have an impact on the Company's financial position, results of operations, or cash flows.

In November 2016, the FASB issued an amendment to the accounting guidance for the presentation of restricted cash in the statement of cash flows. The new guidance requires that the statement of cash flows explain the difference during the period in total cash, cash equivalents, and restricted cash. Also, when cash, cash equivalents, and restricted cash are presented on more than one line item within the statement of financial position, a reconciliation of those line items to the total cash, cash equivalents, and restricted cash presented on the statement of cash flows must be disclosed. The Company adopted this new accounting guidance on December 31, 2017. The adoption did not have an impact on the Company's financial position, results of operations, or cash flows.

On December 22, 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed in reasonable detail to complete the accounting for certain income tax effects of the Tax Cuts and Jobs Act (“Tax Act”). In accordance with SAB 118, the Company recorded $64.6 million of deferred tax expense in connection with the remeasurement of certain deferred tax assets and liabilities in the three months ended December 31, 2017. As of June 30, 2018, and consistent with the disclosure in the Company’s 2017 Form 10-K, as amended by Form 10-K/A, Note 1, Recently Adopted Accounting Pronouncements, the accounting for the Tax Act is incomplete. The Company was able to reasonably estimate certain effects, and consequently recorded provisional adjustments associated with the impact on deferred tax assets and deferred tax liabilities resulting from the reduction of the U.S. federal corporate income tax rate at December 31, 2017. The Company has made no changes to these items during the six months ended June 30, 2018, and continues to evaluate the impacts of the Tax Act, including ongoing guidance and accounting interpretation.

In May 2014, the FASB amended the existing accounting standards for revenue recognition. The amendments are based on the principle that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company adopted the guidance effective January 1, 2018, using the modified retrospective method, with the cumulative effect recognized as of January 1, 2018. All applicable amounts and disclosures for the three and six months ended June 30, 2018, reflect the impact of adoption. As the Company elected to use the modified retrospective method, prior periods presented have not been restated to reflect the impact of adoption unless otherwise noted (see Notes 3 and 13).

In March 2017, the FASB amended the existing accounting guidance relating to the presentation of net periodic pension cost and net periodic postretirement benefit cost (the “NPPC”) in the income statement.  The amended guidance requires the service cost component to be presented in the same line item or items as other compensation arising from the services rendered by the pertinent employees during the period, and other components of the NPPC to be presented in the statement of operations separately from service cost components and outside a subtotal of income from operations. The Company adopted the guidance effective January 1, 2018. The adoption resulted in an increase in operating income of $36.6 million for the six months ended June 30, 2017, and a corresponding increase in total non-operating expense, net for the period. The adoption did not impact segment performance, net income, or cash flows.

Recently Issued Accounting Pronouncements

In February 2016, the FASB issued guidance requiring lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. For lessees, leases will continue to be classified as either operating or finance leases in the income statement. Lessor accounting is similar to the current model but updated to align with certain changes to the lessee model. Lessors will continue to classify leases as operating, direct financing or sales-type leases. The effective date of the new standard is for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition method and requires application of the new guidance at the beginning of the earliest comparative period presented. The Company is evaluating the impact of adopting this new accounting guidance on its financial position, results of operations, or cash flows.

In February 2018, the FASB issued guidance that permits the reclassification of the income tax effects of the 2017 Tax Act on items within accumulated other comprehensive loss to retained earnings. The guidance refers to these amounts as “stranded tax effects.” The amended guidance also requires certain new disclosures. The new guidance is effective for financial statements issued for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is evaluating the impact of adopting this new accounting guidance on its financial position, results of operations, or cash flows.

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Income Per Share of Common Stock

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Income Per Share of Common Stock

Income Per Share of Common Stock

A reconciliation of the numerator and denominator used to calculate basic and diluted income per share of common stock (“EPS”) is presented in the following table:

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
	(In millions, except per share amounts)
Numerator:
Net income	$	34.8		$	24.3		$	48.8		$	30.2
Income allocated to participating securities	(0.8		)	(0.5		)	(1.0		)	(0.7		)
Net income for basic EPS	34.0			23.8			47.8			29.5
Interest on 4 1/16% Convertible Subordinated Debentures (“4 1/16% Debentures”)	—			—			—			0.1
Net income for diluted EPS	$	34.0		$	23.8		$	47.8		$	29.6
Denominator:
Basic weighted average shares	73.9			73.2			73.8			72.6
Effect of:
4 1/16% Debentures	—			—			—			0.1
2.25% Convertible Senior Notes (“2 1/4% Notes”) (1)	1.1			—			1.1			—
Employee stock options and stock purchase plan (2)	0.1			—			0.1			—
Diluted weighted average shares	75.1			73.2			75.0			72.7
Basic
Basic EPS	$	0.46		$	0.32		$	0.65		$	0.41
Diluted
Diluted EPS	$	0.45		$	0.32		$	0.64		$	0.41

_______

(1) The Company's 2 ¹/₄% Notes were not included in the computation of diluted EPS for the three and six months ended June 30, 2017, because the average market price of the common stock did not exceed the conversion price and the Company only expects the conversion premium for the 2 ¹/₄% Notes to be settled in common shares.

(2) There was less than 0.1 million of common share dilution impact from employee stock options and the stock purchase plan for the three and six months ended June 30, 2017.

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Revenue Recognition

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue Recognition

Revenue Recognition

In the Company’s Aerospace and Defense segment, the majority of the Company’s revenue is earned from long-term contracts to design, develop, and manufacture aerospace and defense products, and provide related services, for the Company’s customers, including the U.S. government, major aerospace and defense prime contractors, and a portion of the commercial sector. Each customer contract defines the Company’s distinct performance obligations and the associated transaction price for each obligation. A contract may contain a single or multiple performance obligations. In certain circumstances, multiple contracts with a customer are required to be combined in determining the distinct performance obligations. For contracts with multiple performance obligations, the Company allocates the contracted transaction price to each performance obligation based upon the relative standalone selling price, which represents the price the Company would sell the promised good or service separately to the customer. The Company determines the standalone selling price based upon the facts and circumstances of each obligated good or service. The majority of the Company’s contracts have no observable standalone selling price since the associated products and service are customized to customer specifications. As such, the standalone selling price generally reflects the Company’s forecast of the total cost to satisfy the performance obligation plus an appropriate profit margin.

Contract modifications are routine in the performance of the Company's long-term contracts. Contracts are often modified to account for changes in contract specifications or requirements. In most instances, contract modifications are for goods or services that are not distinct, and, therefore, are accounted for as part of the existing contract.

The Company recognizes revenue as each performance obligation is satisfied. The majority of the Company’s aerospace and defense performance obligations are satisfied over time either as the service is provided, or as control transfers to the customer. Transfer of control is evidenced by the Company’s contractual right to payment for work performed to date plus a reasonable profit on highly customized products. The Company measures progress on substantially all its performance obligations using the cost-to-cost method, which the Company believes best depicts the transfer of control of goods and services to the customer. Under the cost-to-cost method, the Company records revenues based upon costs incurred to date relative to the total estimated cost at completion. Contract costs include labor, material, overhead, and general and administrative expenses, as appropriate.  

Recognition of revenue and profit on long-term contracts requires the use of assumptions and estimates related to the total contract value, the total cost at completion, and the measurement of progress towards completion for each performance obligation. Due to the nature of the programs, developing the estimated total contract value and total cost at completion for each performance obligation requires the use of significant judgment.

The contract value of long-term contracts may include variable consideration, such as incentives, awards, or penalties. The value of variable consideration is generally determined by contracted performance metrics, which may include targets for cost, performance, quality, and schedule. The Company includes variable consideration in the transaction price for the respective performance obligation at either estimated value, or most likely amount to be earned, based upon the Company’s assessment of expected performance. The Company records these amounts only to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved.

The Company evaluates the contract value and cost estimates for performance obligations at least quarterly and more frequently when circumstances significantly change. Factors considered in estimating the work to be completed include, but are not limited to: labor productivity, the nature and technical complexity of the work to be performed, availability and cost volatility of materials, subcontractor and vendor performance, warranty costs, volume assumptions, anticipated labor agreements, inflationary trends, schedule and performance delays, availability of funding from the customer, and the recoverability of costs incurred outside the original contract included in any estimates to complete. When the Company’s estimate of total costs to be incurred to satisfy a performance obligation exceeds the expected revenue, the Company recognizes the loss immediately. When the Company determines that a change in estimates has an impact on the associated profit of a performance obligation, the Company records the cumulative positive or negative adjustment to the statement of operations. Changes in estimates and assumptions related to the status of certain long-term contracts may have a material effect on the Company’s operating results. The following table summarizes the impact of the changes in significant contract accounting estimates on the Company’s Aerospace and Defense segment operating results:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(In millions, except per share amounts)
Net favorable effect of the changes in contract estimates on net sales	$	26.2	$	9.6	$	18.8	$	13.5
Net favorable effect of the changes in contract estimates on income before income taxes	22.0		10.3		14.1		13.7
Net favorable effect of the changes in contract estimates on net income	16.3		6.2		10.4		8.2
Net favorable effect of the changes in contract estimates on basic net income per share	0.22		0.08		0.14		0.11
Net favorable effect of the changes in contract estimates on diluted net income per share	0.21		0.08		0.14		0.11

The three and six months ended June 30, 2018, net favorable changes in contract estimates on income before income taxes were primarily driven by risk retirements on the Terminal High Altitude Area Defense (“THAAD”), RS-68, RS-25, and RL-10 programs and better than expected overhead rate performance, partially offset by cost growth and performance issues on the Commercial Crew Development program.

In the Company’s Aerospace and Defense segment, the timing of revenue recognition, customer invoicing, and collections produces accounts receivable, contract assets, and contract liabilities on the Company’s Consolidated Balance Sheet. The Company invoices in accordance with contract payment terms either based upon a recurring contract payment schedule, or as contract milestones are achieved. Customer invoices, net of reserves, represent an unconditional right of consideration. When revenue is recognized in advance of customer invoicing a contract asset is recorded. Conversely, when customers are invoiced in advance of revenue recognition, a contract liability is recorded. Unpaid customer invoices are reflected as accounts receivable. A summary of the contract assets and liabilities is as follows:

	June 30, 2018			December 31, 2017
	(In millions)
Contract assets	$	296.3		$	310.9
Reserve for overhead rate disallowance	(43.2		)	(42.8		)
Contract assets, net of reserve	253.1			268.1
Contract liabilities	185.3			276.8
Net contract assets (liabilities), net of reserve	$	67.8		$	(8.7	)

Net contract assets (liabilities) increased by $76.5 million, primarily due to a decrease in cash advances on long-term contracts as of June 30, 2018. During the three and six months ended June 30, 2018, the Company recognized sales of $68.0 million and $200.5 million, respectively,that were included in the Company’s contract liabilities as of January 1, 2018.

As of June 30, 2018, the Company’s total remaining performance obligations, also referred to as backlog, totaled $3.9 billion. The Company expects to recognize approximately 48%, or $1.9 billion, of the remaining performance obligations as sales over the next twelve months, an additional 28% the following twelve months, and 24% thereafter.

The Company's contracts are largely categorized as either “fixed-price” (largely used by the U.S. government for production-type contracts) or “cost-reimbursable” (largely used by the U.S. government for development-type contracts). Fixed-price contracts present the risk of unreimbursed cost overruns, potentially resulting in lower than expected contract profits and margins. This risk is generally lower for cost-reimbursable contracts which, as a result, generally have a lower margin. The following are percentages of net sales by contract type:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Fixed-price	58	%	58	%	59	%	57	%
Cost-reimbursable	39		37		38		39
Other	3		5		3		4

The following are percentages of net sales by customer type:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018			2017
U.S. government	93	%	93	%	93	%		93	%
Non U.S. government customers	7		7		7		7	7

The Company's Real Estate segment represented less than 1% of the Company's net sales for the three and six months ended June 30, 2018 and 2017.

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Stock-Based Compensation

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock-Based Compensation

Total stock-based compensation expense by type of award was as follows:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(In millions)
Stock appreciation rights	$	1.4	$	—	$	0.5	$	2.4
Stock options	—		0.3		0.1		0.7
Restricted shares, service based	1.2		1.2		2.2		2.4
Restricted shares, performance based	2.5		1.8		3.6		4.4
Employee stock purchase plan	0.1		0.1		0.3		0.3
Total stock-based compensation expense	$	5.2	$	3.4	$	6.7	$	10.2

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Balance Sheet Accounts

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Balance Sheet Accounts

Balance Sheet Accounts

a. Fair Value of Financial Instruments

The accounting standards use a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. The following are measured at fair value:

			Fair value measurement at June 30, 2018
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Money market funds	$	198.5	$	198.5	$	—	$	—
Commercial paper	119.8		—		119.8		—
	$	318.3	$	198.5	$	119.8	$	—
			Fair value measurement at December 31, 2017
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Money market funds	$	155.0	$	155.0	$	—	$	—
Commercial paper	135.6		—		135.6		—
U.S. treasury notes	4.1		—		4.1		—
	$	294.7	$	155.0	$	139.7	$	—

As of June 30, 2018, of the total estimated fair value for commercial paper, $74.9 million was classified as cash and cash equivalents as the remaining maturity at date of purchase was less than three months, and $44.9 million was classified as marketable securities. As of December 31, 2017, of the total estimated fair value for commercial paper and U.S. treasury notes, $119.7 million was classified as cash and cash equivalents as the remaining maturity at date of purchase was less than three months, and $20.0 million was classified as marketable securities. As of June 30, 2018, and December 31, 2017, the contractual maturities of the Company’s available-for-sale marketable securities were less than one year.

The carrying amounts of certain of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, accrued compensation, and other accrued liabilities, approximate fair value because of their short maturities.

The following table summarizes the estimated fair value and principal amount for outstanding debt obligations:

	Fair Value				Principal Amount
	June 30, 2018		December 31, 2017		June 30, 2018		December 31, 2017
	(In millions)
Term loan	$	360.0	$	370.0	$	360.0	$	370.0
2 1/4% Notes	388.9		415.3		300.0		300.0
Capital leases	1.8		0.9		1.8		0.9
	$	750.7	$	786.2	$	661.8	$	670.9

The fair value of the 2 ¹/₄% Notes was determined using broker quotes that are based on open markets for the Company’s debt securities (Level 2 securities). The term loan bore interest at variable rates, which adjusted based on market conditions, and its carrying value approximated fair value.

b. Accounts Receivable

	June 30, 2018		December 31, 2017
	(In millions)
Billed receivables under long-term contracts	$	133.6	$	63.8
Other receivables	1.0		0.7
Accounts receivable	$	134.6	$	64.5

The Company made certain reclassifications to the December 31, 2017, balance sheet to conform to the current year’s presentation as a result of adopting the new revenue recognition guidance effective January 1, 2018. Accordingly, the Company reclassified $151.0 million of unbilled receivables, net of reserves for disallowances, to contract assets as of December 31, 2017 (see Notes 3 and 13).

c. Other Current Assets, net

	June 30, 2018		December 31, 2017
	(In millions)
Deferred costs recoverable from the U.S. government	$	45.3	$	51.4
Inventories	18.9		19.3
Receivable from Northrop Grumman Corporation (“Northrop”) for environmental remediation costs	6.0		6.0
Prepaid expenses	16.5		19.2
Cost-share and other receivables, net	7.1		7.5
Income taxes receivable	20.5		20.5
Other	8.9		5.2
Other current assets, net	$	123.2	$	129.1

The Company made certain reclassifications to the December 31, 2017, balance sheet to conform to the current year’s presentation as a result of adopting the new revenue recognition guidance effective January 1, 2018. Accordingly, the Company reclassified $117.1 million of inventories to contract assets as of December 31, 2017 (see Notes 3 and 13).

d. Property, Plant and Equipment, net

	June 30, 2018			December 31, 2017
	(In millions)
Land	$	71.2		$	71.2
Buildings and improvements	377.4			368.3
Machinery and equipment	492.5			493.2
Construction-in-progress	38.4			30.3
	979.5			963.0
Less: accumulated depreciation	(621.7		)	(604.0		)
Property, plant and equipment, net	$	357.8		$	359.0

e. Other Noncurrent Assets, net

	June 30, 2018		December 31, 2017
	(In millions)
Real estate held for entitlement and leasing	$	94.9	$	94.0
Receivable from Northrop for environmental remediation costs	55.5		58.5
Deferred costs recoverable from the U.S. government	67.6		66.6
Grantor trusts	22.8		24.2
Notes receivable, net	9.0		9.0
Other	10.7		7.0
Other noncurrent assets, net	$	260.5	$	259.3

f. Other Current Liabilities

	June 30, 2018		December 31, 2017
	(In millions)
Accrued compensation and employee benefits	$	104.2	$	113.4
Competitive improvement program obligations	14.6		15.0
Income taxes payable	136.4		0.8
Postretirement medical and life insurance benefits	4.8		4.8
Other program liabilities	33.2		6.6
Other	19.8		16.3
Other current liabilities	$	313.0	$	156.9

The Company made certain reclassifications to the December 31, 2017, balance sheet to conform to the current year’s presentation as a result of adopting the new revenue recognition guidance effective January 1, 2018. Accordingly, the Company reclassified $39.0 million of other current liabilities to contract liabilities as of December 31, 2017 (see Notes 3 and 13).

The significant increase in the current income tax payable during this reporting period relates to the impact of the Company’s adoption of the new revenue recognition guidance on January 1, 2018. In anticipation of this impact, the Company filed a non-automatic accounting method change request, Form 3115 Application for Change in Accounting Method, with the Internal Revenue Service (“IRS”) during the three months ended March 31, 2018. The change in accounting method for tax purposes will provide for consistent recognition of costs of sales for both book and tax purposes, under certain circumstances. To the extent that the Company receives IRS consent, the Company expects that the current income tax payable and the corresponding deferred tax asset would decrease by approximately $105 million to $115 million.

g. Other Noncurrent Liabilities

	June 30, 2018		December 31, 2017
	(In millions)
Conditional asset retirement obligations	$	44.9	$	44.0
Pension benefits, non-qualified	17.2		17.6
Deferred compensation	29.3		29.4
Deferred revenue	12.4		12.7
Postretirement medical and life insurance benefits	31.4		32.7
Competitive improvement program obligations	13.7		18.4
Uncertain income tax positions	4.9		2.8
Other	20.9		13.5
Other noncurrent liabilities	$	174.7	$	171.1

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Income Taxes

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

	Six months ended June 30,
	2018		2017
	(In millions)
Income tax provision	$	17.2	$	15.2

In the six months ended June 30, 2018, the income tax provision was $17.2 million for an effective tax rate of 26.1%. The Company’s effective tax rate differed from the 21% statutory federal income tax rate primarily due to state income taxes and certain expenditures which are permanently not deductible for tax purposes, partially offset by the impact of R&D credits.

In the six months ended June 30, 2017, the income tax provision was $15.2 million for an effective tax rate of 33.5%. The Company’s effective tax rate differed from the 35% statutory federal income tax rate primarily due to state income taxes and certain expenditures which are permanently not deductible for tax purposes, offset by the impact of R&D credits, tax benefits attributable to the expiration of statute of limitations, and excess tax benefits from the exercise and vesting of stock-based compensation.

See a discussion of the significant increase in the income tax payable balance in Note 5(f).

A valuation allowance is required when it is more-likely-than-not that all or a portion of deferred tax assets may not be realized. Assessing the need for a valuation allowance requires management to evaluate, on a quarterly basis, all available evidence, both positive and negative. As of June 30, 2018, the Company continues to believe that the weight of the positive evidence outweighed the negative evidence regarding the realization of its net deferred tax assets.

In the three months ended June 30, 2018, the Internal Revenue Service notified the Company that its federal income tax return for the fiscal year ended November 30, 2015, was selected for audit. The Company is unable to determine the outcome of the audit at this time.

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Long-term Debt

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Long-term Debt

Long-term Debt

	June 30, 2018			December 31, 2017
	(In millions)
Term loan, bearing interest at variable rates (rate of 4.34% as of June 30, 2018), maturing in June 2021	$	360.0		$	370.0
Unamortized deferred financing costs	(1.4		)	(1.7		)
Total senior debt	358.6			368.3
Senior convertible notes, bearing interest at 2.25% per annum, interest payments due in June and December, maturing in December 2023	300.0			300.0
Unamortized discount and deferred financing costs	(49.0		)	(52.8		)
Total convertible senior notes	251.0			247.2
Capital lease, payable in monthly installments, maturing in 2022	1.8			0.9
Total other debt	1.8			0.9
Total debt, net of unamortized discount and deferred financing costs	611.4			616.4
Less: Amounts due within one year	(30.4		)	(25.0		)
Total long-term debt, net of unamortized discount and deferred financing costs	$	581.0		$	591.4

Senior Credit Facility

On June 17, 2016, the Company entered into a $750.0 million senior secured senior credit facility (the “Senior Credit Facility”).  The Senior Credit Facility matures on June 17, 2021, and consists of (i) a $350.0 million revolving line of credit (the “Revolver”) and (ii) a $400.0 million term loan (the “Term Loan”).  Under the Revolver, up to an aggregate of $100.0 million is available for the issuance of letters of credit and up to an aggregate of $10.0 million is available for swingline loans.  As of June 30, 2018, the Company had $360.0 million outstanding under the Term Loan, zero borrowings under the Revolver, and had issued $38.4 million letters of credit.  

The key financial covenants are as follows:

Financial Covenant	Actual Ratios as of June 30, 2018	Required Ratios
Consolidated Interest Coverage Ratio, as defined under the Senior Credit Facility	11.75 to 1.00	Not less than: 3.00 to 1.00
Consolidated Net Leverage Ratio, as defined under the Senior Credit Facility	2.42 to 1.00	Not greater than: 3.75 to 1.00

The Company was in compliance with its financial and non-financial covenants under the Senior Credit Facility as of June 30, 2018.

2¼% Convertible Senior Notes

The Company issued $300.0 million aggregate principal amount of 2¼% Notes in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended.

The Company separately accounted for the liability and equity components of the 2¼% Notes. The initial liability component of the 2¼% Notes was valued based on the present value of the future cash flows using an estimated borrowing rate at the date of the issuance for similar debt instruments without the conversion feature, which equals the effective interest rate of 5.8% on the liability component. The equity component, or debt discount, was initially valued equal to the principal value of the 2¼% Notes, less the liability component. The debt discount is being amortized as a non-cash charge to interest expense over the period from the issuance date through December 15, 2023.

The debt issuance costs of $5.8 million incurred in connection with the issuance of the 2¼% Notes were capitalized and bifurcated into deferred financing costs of $4.7 million and equity issuance costs of $1.1 million. The deferred financing costs are being amortized to interest expense from the issuance date through December 15, 2023.

The 2¼% Notes consisted of the following (in millions, except years, percentages, conversion rate, and conversion price):

	June 30, 2018			December 31, 2017
Carrying value, long-term	$	251.0		$	247.2
Unamortized discount and deferred financing costs	49.0			52.8
Principal amount	$	300.0		$	300.0
Carrying amount of equity component, net of equity issuance costs	$	54.5		$	54.5
Remaining amortization period (years)	5.5			6.0
Effective interest rate	5.8		%	5.8		%
Conversion rate (shares of common stock per $1,000 principal amount)	38.4615			38.4615
Conversion price (per share of common stock)	$	26.00		$	26.00

Based on the Company's closing stock price of $29.49 on June 30, 2018, the if-converted value of the 2¼% Notes exceeded the aggregate principal amount of the 2¼% Notes by $40.3 million. The Company only expects the conversion premium for the 2 ¹/₄% Notes to be settled in common shares.

The following table presents the interest expense components for the 2¼% Notes:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(In millions)
Interest expense-contractual interest	$	1.7	$	1.7	$	3.4	$	3.4
Interest expense-amortization of debt discount	1.8		1.7		3.5		3.3
Interest expense-amortization of deferred financing costs	0.2		0.2		0.3		0.3

Capital Leases

As of June 30, 2018, and December 31, 2017, the Company had capital lease obligations for certain information technology equipment.

In September 2017, the Company entered into an agreement to lease 122,000-square feet of office space in Huntsville, Alabama. The term of the lease is twenty years and commenced in July 2018 resulting in an estimated remaining financial commitment of $47.8 million representing a present value of $24.9 million as of June 30, 2018.

In October 2017, the Company entered into an agreement to lease a new 136,000-square-foot advanced manufacturing facility located in Huntsville, Alabama. The term of the lease is thirty-one years and is expected to commence in December 2018 resulting in an estimated remaining financial commitment of $34.7 million representing a present value of $21.0 million as of June 30, 2018.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

a. Legal Matters

The Company and its subsidiaries are subject to legal proceedings, including litigation in U.S. federal and state courts, which arise out of, and are incidental to, the ordinary course of the Company’s on-going and historical businesses. The Company is also subject from time to time to governmental investigations by federal and state agencies. The Company cannot predict the outcome of such investigations or proceedings with any degree of certainty. Loss contingency provisions are recorded for probable losses at management’s best estimate of a loss, or when a best estimate cannot be made, a minimum loss contingency amount is recorded. These estimates are often initially developed substantially earlier than when the ultimate loss is known, and are refined each quarterly reporting period as additional information becomes available.

Asbestos Litigation

The Company has been, and continues to be, named as a defendant in lawsuits alleging personal injury or death due to exposure to asbestos in building materials, products, or in manufacturing operations. The majority of cases are pending in Texas and Illinois. There were 54 asbestos cases pending as of June 30, 2018.

Given the lack of any significant consistency to claims (i.e., as to product, operational site, or other relevant assertions) filed against the Company, the Company is generally unable to make a reasonable estimate of the future costs of pending claims or unasserted claims. As of June 30, 2018, the Company has accrued an immaterial amount related to pending claims.

Socorro

On May 12, 2015, a complaint for personal injuries, loss of consortium and punitive damages was filed by James Chavez, Andrew Baca, and their respective spouses, against Aerojet Rocketdyne and the Board of Regents of New Mexico Tech in the Seventh Judicial District, County of Socorro, New Mexico, James Chavez, et al., vs. Aerojet Rocketdyne, Inc., et al., Case No. D725CV201500047. Messrs. Chavez and Baca were employees of Aerotek, a contractor to Aerojet Rocketdyne, who were injured when excess energetic materials being managed by the Energetic Materials Research and Testing Center, a research division of New Mexico Tech, ignited in an unplanned manner. The complaint alleged causes of action based on negligence and negligence per se, strict liability, and willful, reckless and wanton conduct against the defendants including Aerojet Rocketdyne, and sought unspecified compensatory and punitive damages. Aerojet Rocketdyne filed a Motion for Summary Judgment and plaintiff filed a Motion for Partial Summary Judgment. The court denied both parties’ motions and the parties agreed to participate in mediation. A mediator’s proposal was accepted and a formal settlement agreement is being prepared. The Company recorded a liability as of June 30, 2018, for the confidential settlement, the terms of which are not material to the Company’s financial statements.

Department of Justice (“DOJ”) Investigation

The Company responded to a civil investigative demand issued by the DOJ in the three months ended March 31, 2017, requesting information relating to allegations under the False Claims Act that the Company may have previously made false representations to the U.S. government regarding the Company’s compliance with certain regulatory cybersecurity requirements.  In the three months ended June 30, 2018, the DOJ completed its review and declined to intervene in a case filed against the Company and Aerojet Rocketdyne in the U.S. District Court, Eastern District of California, originally filed under seal on September 13, 2017. The case is captioned United States ex. rel. Markus vs. Aerojet Rocketdyne Holdings, Inc. et al., Case No. 2:15-CV-02245-WBS-AC. The complaint alleges causes of action based on false claims, retaliation, and wrongful termination of employment and seeks injunctive relief, civil penalties, and compensatory and punitive damages. The Company is evaluating the complaint and has not recorded any liability for this matter as of June 30, 2018.

b. Environmental Matters

The Company is involved in approximately forty environmental matters under the Comprehensive Environmental Response Compensation and Liability Act, the Resource Conservation Recovery Act, and other federal, state, local, and foreign laws relating to soil and groundwater contamination, hazardous waste management activities, and other environmental matters at some of its current and former facilities. The Company is also involved in a number of remedial activities at third party sites, not owned by the Company, where it is designated a potentially responsible party (“PRP”) by either the U.S. Environmental Protection Agency (“EPA”) and/or a state agency. In many of these matters, the Company is involved with other PRPs. In some instances, the Company’s liability and proportionate share of costs have not been determined largely due to uncertainties as to the nature and extent of site conditions and the Company’s involvement. While government agencies frequently claim PRPs are jointly and severally liable at such sites, in the Company’s experience, interim and final allocations of liability and costs are generally made based on relative contributions of waste or contamination. Anticipated costs associated with environmental remediation that are probable and estimable are accrued. In cases where a date to complete remedial activities at a particular site cannot be determined by reference to agreements or otherwise, the Company projects costs over an appropriate time period not exceeding fifteen years. In such cases, generally the Company does not have the ability to reasonably estimate environmental remediation costs that are beyond this period. Factors that could result in changes to the Company’s estimates include completion of current and future soil and groundwater investigations, new claims, future agency demands, discovery of more or less contamination than expected, discovery of new contaminants, modification of planned remedial actions, changes in estimated time required to remediate, new technologies, and changes in laws and regulations.

As of June 30, 2018, the aggregate range of these anticipated environmental costs was $333.7 million to $493.1 million and the accrued amount was $333.7 million. See Note 8(c) for a summary of the environmental reserve activity. Of these accrued liabilities, approximately 99% relates to the Company’s U.S. government contracting business, and a portion of this liability is recoverable. The significant environmental sites are discussed below. The balance of the accrued liabilities, which are not recoverable from the U.S. government, relate to other sites for which the Company’s obligations are probable and estimable.

Sacramento, California Site

In 1989, a federal district court in California approved a Partial Consent Decree (“PCD”) requiring Aerojet Rocketdyne, among other things, to conduct a Remedial Investigation and Feasibility Study to determine the nature and extent of impacts due to the release of chemicals from the Sacramento, California site, monitor the American River and offsite public water supply wells, operate Groundwater Extraction and Treatment facilities that collect groundwater at the site perimeter, and pay certain government oversight costs. The primary chemicals of concern for both on-site and off-site groundwater are trichloroethylene, perchlorate, and n-nitrosodimethylamine. The 2002 PCD revision (a) separated the Sacramento site into multiple operable units to allow quicker implementation of remedy for critical areas; (b) required the Company to guarantee up to $75 million (in addition to a prior $20 million guarantee) to assure that Aerojet Rocketdyne’s Sacramento remediation activities are fully funded; and (c) removed approximately 2,600 acres of non-contaminated land from the EPA superfund designation.

Aerojet Rocketdyne is involved in various stages of soil and groundwater investigation, remedy selection, design, construction, operation and maintenance associated with the operable units, all of which are conducted under the direction and oversight of the EPA, including unilateral administrative orders, and the California Department of Toxic Substances Control (“DTSC”) and Regional Water Quality Control Board, Central Valley Region (“RWQCB”). On September 22, 2016, the EPA completed its first five-year remedy review of the Sacramento superfund site.  The five-year review required by statute and regulation applies to all remedial actions which result in hazardous substances above levels that allow unlimited use and unrestricted exposure.  The Company is working with the EPA to address the findings of the five-year remedy review. On June 20, 2018, the EPA issued the Company a Unilateral Administrative Order (“UAO”) for the Boundary Operable Unit. Issuance of the UAO is the next step in the Superfund process for the Boundary Operable Unit.

The entire southern portion of the site known as Rio Del Oro was under state orders issued in the 1990s from DTSC and the RWQCB to investigate and remediate soil and groundwater contamination. In 2008, the DTSC released all but approximately 400 acres of the Rio Del Oro property from DTSC’s environmental orders regarding soil contamination although  the property remains subject to the RWQCB’s orders to investigate and remediate groundwater environmental contamination emanating offsite from the property.

As of June 30, 2018, the estimated range of anticipated costs discussed above for the Sacramento, California site was $205.4 million to $325.4 million and the accrued amount was $205.4 million included as a component of the Company’s environmental reserves. Expenditures associated with this matter are partially recoverable. See Note 8(c) below for further discussion on recoverability.

Baldwin Park Operable Unit (“BPOU”)

As a result of its former Azusa, California operations, in 1994 Aerojet Rocketdyne was named a PRP by the EPA in the area of the San Gabriel Valley Basin superfund site known as the BPOU. In 2002, Aerojet Rocketdyne, along with seven other PRPs (the “Cooperating Respondents”) signed a project agreement in late March 2002 with the San Gabriel Basin Water Quality Authority, the Main San Gabriel Basin Watermaster, and five water companies (the “Water Entities”). The 2002 project agreement terminated in 2017 and the parties executed a new project agreement which became operational on May 9, 2017. The new agreement has a ten-year term and requires the Cooperating Respondents to fund through an escrow account the ongoing operation, maintenance, and administrative costs of certain treatment and water distribution facilities owned and operated by the water companies. There are also provisions in the project agreement for maintaining financial assurance.

Pursuant to an agreement with the remaining Cooperating Respondents, Aerojet Rocketdyne's current share of future BPOU costs will be approximately74%.

As part of Aerojet Rocketdyne’s sale of its Electronics and Information Systems (“EIS”) business to Northrop in October 2001, the EPA approved a prospective purchaser agreement with Northrop to absolve it of pre-closing liability for contamination caused by the Azusa, California operations, which liability remains with Aerojet Rocketdyne. As part of that agreement, the Company agreed to provide a $25 million guarantee of its obligations under the project agreement.

As of June 30, 2018, the estimated range of anticipated costs was $110.4 million to $140.8 million and the accrued amount was $110.4 million included as a component of the Company’s environmental reserves. Expenditures associated with this matter are partially recoverable. See Note 8(c) below for further discussion on recoverability.

c. Environmental Reserves and Estimated Recoveries

Environmental Reserves

The Company reviews on a quarterly basis estimated future remediation costs and has an established practice of estimating environmental remediation costs over a fifteen year period, except for those environmental remediation costs with a specific contractual term. Environmental liabilities at the BPOU site are currently estimated through the term of the new project agreement, which expires in May 2027. As the period for which estimated environmental remediation costs lengthens, the reliability of such estimates decreases. These estimates consider the investigative work and analysis of engineers, outside environmental consultants, and the advice of legal staff regarding the status and anticipated results of various administrative and legal proceedings. In most cases, only a range of reasonably possible costs can be estimated. In establishing the Company’s reserves, the most probable estimate is used when determinable; otherwise, the minimum amount is used when no single amount in the range is more probable. Accordingly, such estimates can change as the Company periodically evaluates and revises these estimates as new information becomes available. The Company cannot predict whether new information gained as projects progress will affect the estimated liability accrued. The timing of payment for estimated future environmental costs is influenced by a number of factors, such as the regulatory approval process and the time required designing, constructing, and implementing the remedy.

A summary of the Company’s environmental reserve activity is shown below:

	Aerojet Rocketdyne- Sacramento			Aerojet Rocketdyne- BPOU			Other Aerojet Rocketdyne Sites			Total Aerojet Rocketdyne			Other			Total Environmental Reserve
	(In millions)
December 31, 2017	$	206.5		$	116.4		$	13.7		$	336.6		$	4.8		$	341.4
Additions	8.9			0.8			0.4			10.1			0.5			10.6
Expenditures	(10.0		)	(6.8		)	(1.0		)	(17.8		)	(0.5		)	(18.3		)
June 30, 2018	$	205.4		$	110.4		$	13.1		$	328.9		$	4.8		$	333.7

The effect of the final resolution of environmental matters and the Company’s obligations for environmental remediation and compliance cannot be accurately predicted due to the uncertainty concerning both the amount and timing of future expenditures and due to regulatory or technological changes. The Company continues its efforts to mitigate past and future costs through pursuit of claims for recoveries from insurance coverage and other PRPs and continued investigation of new and more cost effective remediation alternatives and associated technologies.

As part of the acquisition of the Atlantic Research Corporation (“ARC”) propulsion business in 2003, Aerojet Rocketdyne entered into an agreement with ARC pursuant to which Aerojet Rocketdyne is responsible for up to $20.0 million of costs (“Pre-Close Environmental Costs”) associated with environmental issues that arose prior to Aerojet Rocketdyne’s acquisition of the ARC propulsion business. ARC is responsible for any cleanup costs relating to the ARC acquired businesses in excess of $20.0 million. Pursuant to a separate agreement with the U.S. government which was entered into prior to the completion of the ARC acquisition, these costs are recovered through the establishment of prices for Aerojet Rocketdyne’s products and services sold to the U.S. government. The Company reached the $20.0 million cap on cleanup costs in the three months ended March 31, 2017, and expects that additional costs will be incurred due to contamination existing at the time of the acquisition and still requiring remediation and monitoring. On May 6, 2016, ARC informed Aerojet Rocketdyne that it was disputing certain costs that Aerojet Rocketdyne attributed to the $20.0 million Pre-Close Environmental Costs (“ARC Claim”). The Company has met with ARC and responded to the ARC Claim on June 23, 2017. Certain costs related to the ARC Claim will be determined in conjunction with the Company’s evaluation and ultimate resolution of the ARC Claim.

Estimated Recoveries

On January 12, 1999, Aerojet Rocketdyne and the U.S. government reached a settlement agreement (“Global Settlement”) which established a cost-sharing ratio with respect to the clean-up costs of prior environmental contamination. Additionally, in conjunction with the sale of the EIS business in 2001, Aerojet Rocketdyne entered into an agreement with Northrop (the “Northrop Agreement”) whereby Aerojet Rocketdyne is reimbursed by Northrop for a portion of environmental expenditures eligible for recovery under the Global Settlement, subject to an annual billing limitation of $6.0 million and a cumulative limitation of $189.7 million. The cumulative expenditure limitation of $189.7 million was reached in the three months ended June 30, 2017. A summary of the Northrop Agreement activity is shown below (in millions):

Total reimbursable costs under the Northrop Agreement	$	189.7
Amount reimbursed to the Company through June 30, 2018	(128.2		)
Potential future cost reimbursements available	$	61.5

Environmental remediation costs are primarily incurred by the Company's Aerospace and Defense segment, and certain of these costs are recoverable from the Company's contracts with the U.S. government. The Company currently estimates approximately 24% of its future Aerospace and Defense segment environmental remediation costs will not likely be reimbursable and are expensed.

Allowable environmental remediation costs are charged to the Company’s contracts as the costs are incurred. Because these costs are recovered through forward-pricing arrangements, the ability of Aerojet Rocketdyne to continue recovering these costs from the U.S. government depends on Aerojet Rocketdyne’s sustained business volume from U.S. government contracts and programs.

While the Company is currently seeking an arrangement with the U.S. government to recover environmental expenditures in excess of the reimbursement ceiling identified in the Northrop Agreement and Global Settlement, there can be no assurances that such a recovery will be obtained, or if not obtained, that such unreimbursed environmental expenditures will not have a materially adverse effect on the Company’s operating results, financial condition, and/or cash flows.

Environmental reserves and estimated recoveries impact to unaudited condensed consolidated statements of operations

The expenses associated with adjustments to the environmental reserves are recorded as a component of other expense (income), net in the unaudited condensed consolidated statements of operations. Summarized financial information for the impact of environmental reserves and recoveries to the unaudited condensed consolidated statements of operations is set forth below:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Estimated recoverable amounts under U.S. government contracts	$	3.7	$	3.8	$	7.8	$	7.7
Expense to unaudited condensed consolidated statement of operations	1.4		0.9		2.8		1.7
Total environmental reserve adjustments	$	5.1	$	4.7	$	10.6	$	9.4

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Arrangements with Off-Balance Sheet Risk

6 Months Ended

Jun. 30, 2018

Offsetting [Abstract]

Arrangements with Off-Balance Sheet Risk

Arrangements with Off-Balance Sheet Risk

As of June 30, 2018, arrangements with off-balance sheet risk consisted of:

• $38.4 million in outstanding commercial letters of credit,the majority of which may be renewed, primarily to collateralize obligations for environmental remediation and insurance coverage.

• $53.6 million in outstanding surety bonds to primarily satisfy indemnification obligations for environmental remediation coverage.

• $120.0 million aggregate in guarantees by the Company of Aerojet Rocketdyne’s obligations to U.S. government agencies for environmental remediation activities.

• $82.5 million in commitments associated with the Company's new facilities located in Huntsville, Alabama.

• Guarantees, jointly and severally, by the Company’s material domestic subsidiaries of their obligations under the Senior Credit Facility.

In addition to the items discussed above, the Company has and will from time to time enter into certain types of contracts that require the Company to indemnify parties against potential third-party and other claims. These contracts primarily relate to: (i) divestiture agreements, under which the Company may provide customary indemnification to purchasers of its businesses or assets including, for example, claims arising from the operation of the businesses prior to disposition, and liability to investigate and remediate environmental contamination existing prior to disposition; (ii) certain real estate leases, under which the Company may be required to indemnify property owners for claims arising from the use of the applicable premises; and (iii) certain agreements with officers and directors, under which the Company may be required to indemnify such persons for liabilities arising out of their relationship with the Company. The terms of such obligations vary. Generally, a maximum obligation is not explicitly stated.

Additionally, the Company has open purchase orders and other commitments to suppliers, subcontractors, and other outsourcing partners for equipment, materials, and supplies in the normal course of business. These amounts are based on volumes consistent with anticipated requirements to fulfill purchase orders or contracts for product deliveries received, or expected to be received, from customers. A substantial portion of these amounts are recoverable through the Company's contracts with the U.S. government.

The Company provides product warranties in conjunction with certain product sales. The majority of the Company’s warranties are a one-year standard warranty for parts, workmanship, and compliance with specifications. On occasion, the Company has made commitments beyond the standard warranty obligation. While the Company has contracts with warranty provisions, there is not a history of any significant warranty claims experience. A reserve for warranty exposure is made on a product by product basis when it is both estimable and probable. These costs are included in the program’s estimate at completion and are expensed in accordance with the Company’s revenue recognition methodology as allowed under GAAP for that particular contract.

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Cost Reduction Plans

6 Months Ended

Jun. 30, 2018

Restructuring and Related Activities [Abstract]

Cost Reduction Plans

Cost Reduction Plans

During 2015, the Company initiated the first phase (“Phase I”) of the competitive improvement program (the “CIP”) comprised of activities and initiatives aimed at reducing costs in order for the Company to continue to compete successfully. Phase I is comprised of three major components: (i) facilities optimization and footprint reduction; (ii) product affordability; and (iii) reduced administrative and overhead costs. On April 6, 2017, the Board of Directors approved the second phase (“Phase II”) of the Company’s previously announced CIP. Pursuant to Phase II, the Company is expanding its CIP and further consolidating its Sacramento, California, and Gainesville, Virginia sites, while centralizing and expanding its existing presence in Huntsville, Alabama. The Company currently estimates that it will incur restructuring and related costs of the Phase I and II programs of approximately $235.1 million (including approximately $60.5 million of capital expenditures). The Company has incurred $97.9 million of such costs through June 30, 2018, including $36.6 million in capital expenditures. A summary of the Company's severance and retention liabilities related to Phase I and II activity is shown below:

	Severance			Retention			Total
	(In millions)
December 31, 2017	$	30.0		$	3.4		$	33.4
Accrual	—			2.7			2.7
Payments	(5.4		)	(2.4		)	(7.8		)
June 30, 2018	$	24.6		$	3.7		$	28.3

The costs associated with Phase I and II are included as a component of the Company’s U.S. government forward-pricing rates, and therefore, are recovered through the pricing of the Company’s products and services to the U.S. government. In addition to the employee-related CIP obligations, the Company incurred non-cash accelerated depreciation expense of $0.7 million and $2.2 million in the six months ended June 30, 2018 and 2017, respectively, associated with changes in the estimated useful lives of long-lived assets.

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Retirement Benefits

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Retirement Benefits

Retirement Benefits

Components of retirement benefits expense (income) are:

	Pension Benefits						Postretirement Medical and Life Insurance Benefits
	Three months ended June 30,
	2018			2017			2018			2017
	(In millions)
Interest cost on benefit obligation	$	12.5		$	14.4		$	0.3		$	0.3
Assumed return on plan assets	(15.1		)	(12.4		)	—			—
Amortization of prior service costs	0.1			0.1			—			—
Recognized net actuarial losses (gains)	17.6			16.9			(1.0		)	(1.0		)
Retirement benefits expense (income)	$	15.1		$	19.0		$	(0.7	)	$	(0.7	)

	Pension Benefits						Postretirement Medical and Life Insurance Benefits
	Six months ended June 30,
	2018			2017			2018			2017
	(In millions)
Interest cost on benefit obligation	$	24.9		$	28.8		$	0.6		$	0.7
Assumed return on plan assets	(30.1		)	(24.8		)	—			—
Amortization of prior service costs (credits)	0.1			0.1			(0.1		)	(0.1		)
Recognized net actuarial losses (gains)	35.3			33.9			(1.9		)	(2.0		)
Retirement benefits expense (income)	$	30.2		$	38.0		$	(1.4	)	$	(1.4	)

Service costs represent the annual growth in benefits earned by participants during the year. Since the Company’s defined benefit pension plan future benefit accrual is discontinued for all participants, the Company has determined in connection with the adoption of accounting guidance on presentation of service cost and other components of retirement benefits expense that the service cost is zero for all periods presented.  Historically, the Company has included expenses paid from the tax-qualified defined benefit pension plan trust, including Public Benefit Guaranty Corporation, audit, actuarial, legal and administrative fees, as service costs in the presentation of the components of retirement benefits expense (income). The Company determined that the vast majority of these types of expenses reflect a reduction to the assumed return on plan assets because they reduce the expected growth of the plan assets.  As such, the Company has elected to reclassify the trust-paid expenses related to the tax-qualified defined benefit pension plan as a reduction to assumed return on plan assets for all periods presented. For the three and six months ended June 30, 2017, the Company has reclassified expenses of $3.8 million and $7.5 million, respectively, from service cost to assumed return on plan assets in the table above. This change in presentation had no impact on net retirement benefits expense (income).

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Operating Segments and Related Disclosures

6 Months Ended

Jun. 30, 2018

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.

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

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

The Company's sales to each of the major customers listed above involve several product lines and programs.

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Unusual Items

6 Months Ended

Jun. 30, 2018

Unusual or Infrequent Items, or Both [Abstract]

Unusual Items

Unusual Items

Total unusual items, a component of other expense (income), net in the unaudited condensed consolidated statements of operations, were as follows:

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
	(In millions)
Unusual items
Legal related matters	$	—	$	(1.3	)	$	—	$	(1.9	)
Acquisition costs	—		—			—		1.0
	$	—	$	(1.3	)	$	—	$	(0.9	)

Three and six months ended June 30, 2017, activity:

During the three and six months ended June 30, 2017, the Company recorded $1.3 million and $1.9 million, respectively, of realized gains, net of interest associated with the failure to register with the Securities and Exchange Commission the issuance of certain of the Company’s common shares under the defined contribution 401(k) employee benefit plan.

During the six months ended June 30, 2017, the Company recorded $1.0 million of costs related to the acquisition of the Coleman Aerospace Business.

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Adoption of Revenue Recognition

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Adoption of Revenue Recognition Guidance

Adoption of Revenue Recognition Guidance

The Company adopted the new revenue recognition guidance effective January 1, 2018, using the modified retrospective method, with the cumulative effect recognized as of January 1, 2018. The primary impact of the new guidance was a change in the timing of revenue recognition on certain long-term contracts in the Company’s Aerospace and Defense segment. The adoption of the new revenue recognition guidance did not impact revenue recognized within the Company's Real Estate segment. The new guidance does not change the total sales or operating income on the related customer contracts, only the timing of when sales and operating income are recognized. Under this new guidance, the Company discontinued the use of the unit-of-delivery revenue recognition method on certain customer contracts and re-measured the performance obligations using the cost-to-cost method. The unit-of-delivery method was utilized for 48% of net sales for the year ended December 31, 2017. The cumulative favorable impact of the adoption was $37.6 million of net income which was recorded to stockholders' equity.

Further, as the Company’s adoption of the guidance accelerated the timing of revenue recognition on some of the Company's contracts, the adoption resulted in a $0.6 billion reduction in the Company's remaining performance obligations, also referred to as backlog, as of December 31, 2017.

The following tables summarize the effect of adoption of the new revenue recognition standard on the Company’s unaudited condensed consolidated financial statements as of and for the three and six months ended June 30, 2018.

Condensed Consolidated Statement of Operations

(Unaudited)

	Three months ended June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions, except per share amounts)
Net sales	$	467.2		$	9.4		$	476.6
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	369.5			12.9			382.4
Selling, general and administrative expense	11.1			—			11.1
Depreciation and amortization	17.7			—			17.7
Other expense, net	0.9			—			0.9
Total operating costs and expenses	399.2			12.9			412.1
Operating income	68.0			(3.5		)	64.5
Non-operating (income) expense:
Retirement benefits expense	14.4			—			14.4
Interest income	(2.0		)	—			(2.0		)
Interest expense	8.3			—			8.3
Total non-operating expense, net	20.7			—			20.7
Income before income taxes	47.3			(3.5		)	43.8
Income tax provision	12.5			(1.1		)	11.4
Net income	$	34.8		$	(2.4	)	$	32.4
Earnings Per Share of Common Stock
Basic
Basic net income per share	$	0.46		$	(0.03	)	$	0.43
Diluted
Diluted net income per share	$	0.45		$	(0.03	)	$	0.42
Weighted average shares of common stock outstanding, basic	73.9			—			73.9
Weighted average shares of common stock outstanding, diluted	75.1			—			75.1

Condensed Consolidated Statement of Comprehensive Income

(Unaudited)

	Three months ended June 30, 2018
	As Reported		Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
Net income	$	34.8	$	(2.4	)	$	32.4
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes	12.5		—			12.5
Comprehensive income	$	47.3	$	(2.4	)	$	44.9

Condensed Consolidated Statement of Operations

(Unaudited)

	Six months ended June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions, except per share amounts)
Net sales	$	959.2		$	(13.2	)	$	946.0
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	796.3			(1.8		)	794.5
Selling, general and administrative expense	17.8			—			17.8
Depreciation and amortization	35.4			—			35.4
Other expense, net	2.1			—			2.1
Total operating costs and expenses	851.6			(1.8		)	849.8
Operating income	107.6			(11.4		)	96.2
Non-operating (income) expense:
Retirement benefits expense	28.8			—			28.8
Interest income	(3.6		)	—			(3.6		)
Interest expense	16.4			—			16.4
Total non-operating expense, net	41.6			—			41.6
Income before income taxes	66.0			(11.4		)	54.6
Income tax provision	17.2			(3.1		)	14.1
Net income	$	48.8		$	(8.3	)	$	40.5
Earnings Per Share of Common Stock
Basic
Basic net income per share	$	0.65		$	(0.11	)	$	0.54
Diluted
Diluted net income per share	$	0.64		$	(0.11	)	$	0.53
Weighted average shares of common stock outstanding, basic	73.8			—			73.8
Weighted average shares of common stock outstanding, diluted	75.0			—			75.0

Condensed Consolidated Statement of Comprehensive Income

(Unaudited)

	Six months ended June 30, 2018
	As Reported		Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
Net income	$	48.8	$	(8.3	)	$	40.5
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes	25.0		—			25.0
Comprehensive income	$	73.8	$	(8.3	)	$	65.5

Condensed Consolidated Balance Sheet

(Unaudited)

	As of June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	514.7		$	—		$	514.7
Marketable securities	44.9			—			44.9
Accounts receivable	134.6			(55.9		)	78.7
Contract assets	253.1			19.5			272.6
Other current assets, net	123.2			(10.5		)	112.7
Total Current Assets	1,070.5			(46.9		)	1,023.6
Noncurrent Assets
Property, plant and equipment, net	357.8			—			357.8
Recoverable environmental remediation costs	225.8			—			225.8
Deferred income taxes	255.5			(117.4		)	138.1
Goodwill	161.3			—			161.3
Intangible assets	78.7			—			78.7
Other noncurrent assets, net	260.5			—			260.5
Total Noncurrent Assets	1,339.6			(117.4		)	1,222.2
Total Assets	$	2,410.1		$	(164.3	)	$	2,245.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt	$	30.4		$	—		$	30.4
Accounts payable	104.1			—			104.1
Reserves for environmental remediation costs	34.6			—			34.6
Contract liabilities	185.3			13.9			199.2
Other current liabilities	313.0			(132.3		)	180.7
Total Current Liabilities	667.4			(118.4		)	549.0
Total Noncurrent Liabilities	1,522.6			—			1,522.6
Total Liabilities	2,190.0			(118.4		)	2,071.6
Stockholders’ Equity
Common stock	7.4			—			7.4
Other capital	509.4			—			509.4
Treasury stock at cost	(64.5		)	—			(64.5		)
Retained earnings (accumulated deficit)	15.4			(45.9		)	(30.5		)
Accumulated other comprehensive loss, net of income taxes	(247.6		)	—			(247.6		)
Total Stockholders’ Equity	220.1			(45.9		)	174.2
Total Liabilities and Stockholders’ Equity	$	2,410.1		$	(164.3	)	$	2,245.8

Condensed Consolidated Statement of Cash Flows

(Unaudited)

	Six months ended June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
Operating Activities
Net income	$	48.8		$	(8.3	)	$	40.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35.4			—			35.4
Amortization of debt discount and deferred financing costs	4.4			—			4.4
Stock-based compensation	6.7			—			6.7
Retirement benefits, net	6.7			—			6.7
Insurance proceeds	(1.9		)	—			(1.9		)
Other, net	(0.1		)	—			(0.1		)
Changes in assets and liabilities:
Accounts receivable	(40.7		)	26.5			(14.2		)
Contract assets	(7.5		)	3.0			(4.5		)
Other current assets, net	16.3			0.4			16.7
Recoverable environmental remediation costs	5.3			—			5.3
Other noncurrent assets	(1.5		)	—			(1.5		)
Accounts payable	(9.7		)	—			(9.7		)
Contract liabilities	(58.1		)	(19.5		)	(77.6		)
Other current liabilities	21.8			1.0			22.8
Deferred income taxes	2.3			(3.1		)	(0.8		)
Reserves for environmental remediation costs	(7.7		)	—			(7.7		)
Other noncurrent liabilities and other	4.0			—			4.0
Net Cash Provided by Operating Activities	24.5			—			24.5
Investing Activities
Purchases of marketable securities	(44.7		)	—			(44.7		)
Sales of marketable securities	20.1			—			20.1
Insurance proceeds	1.9			—			1.9
Capital expenditures	(12.2		)	—			(12.2		)
Net Cash Used in Investing Activities	(34.9		)	—			(34.9		)
Financing Activities
Debt repayments	(10.3		)	—			(10.3		)
Repurchase of shares for withholding taxes and option costs under employee equity plans	(2.1		)	—			(2.1		)
Proceeds from shares issued under equity plans	2.5			—			2.5
Net Cash Used in Financing Activities	(9.9		)	—			(9.9		)
Net Decrease in Cash and Cash Equivalents	(20.3		)	—			(20.3		)
Cash and Cash Equivalents at Beginning of Period	535.0			—			535.0
Cash and Cash Equivalents at End of Period	$	514.7		$	—		$	514.7

The following table summarizes the reclassifications to the December 31, 2017, balance sheet to conform to the current year’s presentation.

	As Reported		Reclassifications due to Adoption			As Adjusted
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	535.0	$	—		$	535.0
Marketable securities	20.0		—			20.0
Accounts receivable	215.5		(151.0		)	64.5
Inventories	136.4		(136.4		)	—
Contract assets	—		268.1			268.1
Other current assets, net	109.8		19.3			129.1
Total Current Assets	1,016.7		—			1,016.7
Total Noncurrent Assets	1,242.0		—			1,242.0
Total Assets	$	2,258.7	$	—		$	2,258.7
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt	$	25.0	$	—		$	25.0
Accounts payable	100.9		—			100.9
Reserves for environmental remediation costs	35.2		—			35.2
Contract liabilities	—		276.8			276.8
Advance payments on contracts	237.8		(237.8		)	—
Other current liabilities	195.9		(39.0		)	156.9
Total Current Liabilities	594.8		—			594.8
Total Noncurrent Liabilities	1,561.5		—			1,561.5
Total Liabilities	2,156.3		—			2,156.3
Stockholders’ Equity
Total Stockholders’ Equity	102.4		—			102.4
Total Liabilities and Stockholders’ Equity	$	2,258.7	$	—		$	2,258.7

The following table summarizes the reclassifications to the six months ended June 30, 2017, statement of cash flows to conform to the current year’s presentation.

	As Reported			Reclassifications due to Adoption			As Adjusted
	(In millions)
Operating Activities
Net income	$	30.2		$	—		$	30.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35.4			—			35.4
Amortization of debt discount and deferred financing costs	4.2			—			4.2
Stock-based compensation	10.2			—			10.2
Retirement benefits, net	15.4			—			15.4
Other, net	0.3			—			0.3
Changes in assets and liabilities, net of effects from acquisition in 2017:
Accounts receivable	(87.8		)	37.5			(50.3		)
Inventories	20.7			(20.7		)	—
Contract assets	—			(9.7		)	(9.7		)
Other current assets, net	19.3			(7.1		)	12.2
Recoverable environmental remediation costs	10.1			—			10.1
Other noncurrent assets	(31.5		)	—			(31.5		)
Accounts payable	12.6			—			12.6
Contract liabilities	—			(43.0		)	(43.0		)
Advance payments on contracts	(49.0		)	49.0			—
Other current liabilities	19.6			(6.0		)	13.6
Deferred income taxes	15.9			—			15.9
Reserves for environmental remediation costs	(10.8		)	—			(10.8		)
Other noncurrent liabilities and other	22.9			—			22.9
Net Cash Provided by Operating Activities	37.7			—			37.7
Investing Activities
Net Cash Used in Investing Activities	(21.1		)	—			(21.1		)
Financing Activities
Net Cash Used in Financing Activities	(13.3		)	—			(13.3		)
Net Increase in Cash and Cash Equivalents	3.3			—			3.3
Cash and Cash Equivalents at Beginning of Period	410.3			—			410.3
Cash and Cash Equivalents at End of Period	$	413.6		$	—		$	413.6

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Basis of Presentation and Nature of Operations (Policies)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Basis of Presentation and Nature of Operations

Aerojet Rocketdyne Holdings, Inc. (“Aerojet Rocketdyne Holdings” or the “Company”) has prepared the accompanying unaudited condensed consolidated financial statements, including its accounts and the accounts of its wholly-owned subsidiaries, in accordance with the instructions to Form 10-Q. The December 31, 2017, condensed consolidated balance sheet was derived from audited financial statements, but does not include all of the disclosures required by accounting principles generally accepted in the United States of America (“GAAP”). These interim financial statements should be read in conjunction with the financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017. Certain reclassifications have been made to financial information for the prior year to conform to the current year’s presentation (see “Recently Adopted Accounting Pronouncements” below and Note 13).

The Company believes the accompanying unaudited condensed consolidated financial statements reflect all adjustments, including normal recurring accruals, necessary for a fair statement of its financial position, results of operations, and cash flows for the periods presented. All significant intercompany balances and transactions have been eliminated in consolidation. The preparation of the unaudited condensed consolidated financial statements in conformity with GAAP requires the Company to make estimates and assumptions that affect the amounts reported in the unaudited condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates. In addition, the operating results for interim periods may not be indicative of the results of operations for a full year.

The Company’s operations are organized into two segments:

Aerospace and Defense — includes the operations of the Company’s wholly-owned subsidiary Aerojet Rocketdyne, Inc. (“Aerojet Rocketdyne”), a leading technology-based designer, developer and manufacturer of aerospace and defense products and systems for the United States (“U.S.”) government, including the Department of Defense (“DoD”), the National Aeronautics and Space Administration (“NASA”), and major aerospace and defense prime contractors.

Real Estate — includes the activities of the Company’s wholly-owned subsidiary Easton Development Company, LLC (“Easton”) related to the re-zoning, entitlement, sale, and leasing of the Company’s excess real estate assets. The Company is currently in the process of seeking zoning changes and other governmental approvals on its excess real estate assets to optimize their value.

A detailed description of the Company’s significant accounting policies can be found in the Company’s most recent Annual Report on Form 10-K, as amended by Form 10-K/A, for the year ended December 31, 2017.

AR1 Research and Development

AR1 Research and Development

Company-sponsored research and development (“R&D”) expenses (reported as a component of cost of sales) are generally reimbursed via allocation of such expenses among all contracts and programs in progress under U.S. government contractual arrangements. The Company's newest large liquid booster engine development project, the AR1, accounted for $56.1 million of such reimbursable costs from its inception through June 30, 2018. In February 2016, pursuant to an Other Transaction Agreement (“OTA”), the U.S. Air Force selected Aerojet Rocketdyne and United Launch Alliance (“ULA”) to share in a public-private partnership to develop jointly the AR1 engine under an agreement valued at $804.0 million with the U.S. Air Force investing two-thirds of the funding required to complete development of the AR1 engine by December 2019. In June 2018, the Company and the U.S. Air Force signed a modification to the existing OTA to modify the scope, funding, cost share, and period of performance of the AR1 engine. The modified OTA is valued at $353.8 million with the U.S. Air Force investing five-sixths of the funding required to design, build, and assemble a single AR1 engine prototype by December 2019. The U.S. Air Force contributions are recognized proportionately as an offset to R&D expenses. The AR1 inception to date, beginning in 2015, project costs at June 30, 2018, were as follows (in millions):

AR1 R&D costs incurred	$	290.1
Less amounts funded by the U.S. Air Force	(192.3		)
Less amounts funded by ULA	(9.6		)
AR1 R&D costs net of reimbursements	$	88.2

Recently Adopted and Issued Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In March 2016, the Financial Accounting Standards Board (“FASB”) amended the existing accounting guidance related to stock compensation. The amendment requires all income tax effects of awards to be recognized in the income statement when awards vest and allows a choice to account for forfeitures on an estimated or actual basis. There is also a requirement to present excess income tax benefits as an operating activity on the statement of cash flows. Effective January 1, 2017, the Company adopted the amendment requiring recognition of excess tax benefits and tax deficiencies in the income statement prospectively. In addition, the Company elected to change its accounting policy to account for forfeitures when they occur for consistency with the U.S. government recovery accounting practices on a modified retrospective basis. The Company also elected to adopt the amendment related to the presentation of excess tax benefits within operating activities on the statement of cash flows, retrospectively.

In January 2017, the FASB issued an amendment to the accounting guidance related to goodwill impairment. The update eliminates “Step 2” which involves determining the implied fair value of goodwill and comparing it to the carrying amount of goodwill to measure the goodwill impairment loss, if any. The quantitative assessment “Step 1” will be used to determine both the existence and amount of goodwill impairment. The standard should be applied on a prospective basis and is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted this new accounting guidance in conjunction with its annual impairment test on October 1, 2017. The adoption did not have an impact on the Company's financial position, results of operations, or cash flows.

In August 2016, the FASB issued an amendment to the accounting guidance related to classification of certain cash receipts and cash payments in the statement of cash flows. The standard provides guidance for eight targeted changes with respect to how cash receipts and cash payments are classified in the statement of cash flows, with the objective of reducing diversity in practice. The Company adopted this new accounting guidance on December 31, 2017. The adoption did not have an impact on the Company's financial position, results of operations, or cash flows.

In November 2016, the FASB issued an amendment to the accounting guidance for the presentation of restricted cash in the statement of cash flows. The new guidance requires that the statement of cash flows explain the difference during the period in total cash, cash equivalents, and restricted cash. Also, when cash, cash equivalents, and restricted cash are presented on more than one line item within the statement of financial position, a reconciliation of those line items to the total cash, cash equivalents, and restricted cash presented on the statement of cash flows must be disclosed. The Company adopted this new accounting guidance on December 31, 2017. The adoption did not have an impact on the Company's financial position, results of operations, or cash flows.

On December 22, 2017, Staff Accounting Bulletin No. 118 (“SAB 118”) was issued to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed in reasonable detail to complete the accounting for certain income tax effects of the Tax Cuts and Jobs Act (“Tax Act”). In accordance with SAB 118, the Company recorded $64.6 million of deferred tax expense in connection with the remeasurement of certain deferred tax assets and liabilities in the three months ended December 31, 2017. As of June 30, 2018, and consistent with the disclosure in the Company’s 2017 Form 10-K, as amended by Form 10-K/A, Note 1, Recently Adopted Accounting Pronouncements, the accounting for the Tax Act is incomplete. The Company was able to reasonably estimate certain effects, and consequently recorded provisional adjustments associated with the impact on deferred tax assets and deferred tax liabilities resulting from the reduction of the U.S. federal corporate income tax rate at December 31, 2017. The Company has made no changes to these items during the six months ended June 30, 2018, and continues to evaluate the impacts of the Tax Act, including ongoing guidance and accounting interpretation.

In May 2014, the FASB amended the existing accounting standards for revenue recognition. The amendments are based on the principle that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company adopted the guidance effective January 1, 2018, using the modified retrospective method, with the cumulative effect recognized as of January 1, 2018. All applicable amounts and disclosures for the three and six months ended June 30, 2018, reflect the impact of adoption. As the Company elected to use the modified retrospective method, prior periods presented have not been restated to reflect the impact of adoption unless otherwise noted (see Notes 3 and 13).

In March 2017, the FASB amended the existing accounting guidance relating to the presentation of net periodic pension cost and net periodic postretirement benefit cost (the “NPPC”) in the income statement.  The amended guidance requires the service cost component to be presented in the same line item or items as other compensation arising from the services rendered by the pertinent employees during the period, and other components of the NPPC to be presented in the statement of operations separately from service cost components and outside a subtotal of income from operations. The Company adopted the guidance effective January 1, 2018. The adoption resulted in an increase in operating income of $36.6 million for the six months ended June 30, 2017, and a corresponding increase in total non-operating expense, net for the period. The adoption did not impact segment performance, net income, or cash flows.

Recently Issued Accounting Pronouncements

In February 2016, the FASB issued guidance requiring lessees to recognize a right-of-use asset and a lease liability on the balance sheet for all leases with the exception of short-term leases. For lessees, leases will continue to be classified as either operating or finance leases in the income statement. Lessor accounting is similar to the current model but updated to align with certain changes to the lessee model. Lessors will continue to classify leases as operating, direct financing or sales-type leases. The effective date of the new standard is for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition method and requires application of the new guidance at the beginning of the earliest comparative period presented. The Company is evaluating the impact of adopting this new accounting guidance on its financial position, results of operations, or cash flows.

In February 2018, the FASB issued guidance that permits the reclassification of the income tax effects of the 2017 Tax Act on items within accumulated other comprehensive loss to retained earnings. The guidance refers to these amounts as “stranded tax effects.” The amended guidance also requires certain new disclosures. The new guidance is effective for financial statements issued for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. The Company is evaluating the impact of adopting this new accounting guidance on its financial position, results of operations, or cash flows.

Revenue Recognition

In the Company’s Aerospace and Defense segment, the timing of revenue recognition, customer invoicing, and collections produces accounts receivable, contract assets, and contract liabilities on the Company’s Consolidated Balance Sheet. The Company invoices in accordance with contract payment terms either based upon a recurring contract payment schedule, or as contract milestones are achieved. Customer invoices, net of reserves, represent an unconditional right of consideration. When revenue is recognized in advance of customer invoicing a contract asset is recorded. Conversely, when customers are invoiced in advance of revenue recognition, a contract liability is recorded. Unpaid customer invoices are reflected as accounts receivable.

The Company's contracts are largely categorized as either “fixed-price” (largely used by the U.S. government for production-type contracts) or “cost-reimbursable” (largely used by the U.S. government for development-type contracts). Fixed-price contracts present the risk of unreimbursed cost overruns, potentially resulting in lower than expected contract profits and margins. This risk is generally lower for cost-reimbursable contracts which, as a result, generally have a lower margin.

Revenue Recognition

In the Company’s Aerospace and Defense segment, the majority of the Company’s revenue is earned from long-term contracts to design, develop, and manufacture aerospace and defense products, and provide related services, for the Company’s customers, including the U.S. government, major aerospace and defense prime contractors, and a portion of the commercial sector. Each customer contract defines the Company’s distinct performance obligations and the associated transaction price for each obligation. A contract may contain a single or multiple performance obligations. In certain circumstances, multiple contracts with a customer are required to be combined in determining the distinct performance obligations. For contracts with multiple performance obligations, the Company allocates the contracted transaction price to each performance obligation based upon the relative standalone selling price, which represents the price the Company would sell the promised good or service separately to the customer. The Company determines the standalone selling price based upon the facts and circumstances of each obligated good or service. The majority of the Company’s contracts have no observable standalone selling price since the associated products and service are customized to customer specifications. As such, the standalone selling price generally reflects the Company’s forecast of the total cost to satisfy the performance obligation plus an appropriate profit margin.

Contract modifications are routine in the performance of the Company's long-term contracts. Contracts are often modified to account for changes in contract specifications or requirements. In most instances, contract modifications are for goods or services that are not distinct, and, therefore, are accounted for as part of the existing contract.

The Company recognizes revenue as each performance obligation is satisfied. The majority of the Company’s aerospace and defense performance obligations are satisfied over time either as the service is provided, or as control transfers to the customer. Transfer of control is evidenced by the Company’s contractual right to payment for work performed to date plus a reasonable profit on highly customized products. The Company measures progress on substantially all its performance obligations using the cost-to-cost method, which the Company believes best depicts the transfer of control of goods and services to the customer. Under the cost-to-cost method, the Company records revenues based upon costs incurred to date relative to the total estimated cost at completion. Contract costs include labor, material, overhead, and general and administrative expenses, as appropriate.  

Recognition of revenue and profit on long-term contracts requires the use of assumptions and estimates related to the total contract value, the total cost at completion, and the measurement of progress towards completion for each performance obligation. Due to the nature of the programs, developing the estimated total contract value and total cost at completion for each performance obligation requires the use of significant judgment.

The contract value of long-term contracts may include variable consideration, such as incentives, awards, or penalties. The value of variable consideration is generally determined by contracted performance metrics, which may include targets for cost, performance, quality, and schedule. The Company includes variable consideration in the transaction price for the respective performance obligation at either estimated value, or most likely amount to be earned, based upon the Company’s assessment of expected performance. The Company records these amounts only to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is resolved.

The Company evaluates the contract value and cost estimates for performance obligations at least quarterly and more frequently when circumstances significantly change. Factors considered in estimating the work to be completed include, but are not limited to: labor productivity, the nature and technical complexity of the work to be performed, availability and cost volatility of materials, subcontractor and vendor performance, warranty costs, volume assumptions, anticipated labor agreements, inflationary trends, schedule and performance delays, availability of funding from the customer, and the recoverability of costs incurred outside the original contract included in any estimates to complete. When the Company’s estimate of total costs to be incurred to satisfy a performance obligation exceeds the expected revenue, the Company recognizes the loss immediately. When the Company determines that a change in estimates has an impact on the associated profit of a performance obligation, the Company records the cumulative positive or negative adjustment to the statement of operations.

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Basis of Presentation and Nature of Operations (Tables)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

AR1 Inception to Date Project Costs

The AR1 inception to date, beginning in 2015, project costs at June 30, 2018, were as follows (in millions):

AR1 R&D costs incurred	$	290.1
Less amounts funded by the U.S. Air Force	(192.3		)
Less amounts funded by ULA	(9.6		)
AR1 R&D costs net of reimbursements	$	88.2

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Income Per Share of Common Stock (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Summary of Reconciliation of Numerator and Denominator Used to Calculate Basic and Diluted Income (Loss) Per Share of Common Stock

A reconciliation of the numerator and denominator used to calculate basic and diluted income per share of common stock (“EPS”) is presented in the following table:

	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
	(In millions, except per share amounts)
Numerator:
Net income	$	34.8		$	24.3		$	48.8		$	30.2
Income allocated to participating securities	(0.8		)	(0.5		)	(1.0		)	(0.7		)
Net income for basic EPS	34.0			23.8			47.8			29.5
Interest on 4 1/16% Convertible Subordinated Debentures (“4 1/16% Debentures”)	—			—			—			0.1
Net income for diluted EPS	$	34.0		$	23.8		$	47.8		$	29.6
Denominator:
Basic weighted average shares	73.9			73.2			73.8			72.6
Effect of:
4 1/16% Debentures	—			—			—			0.1
2.25% Convertible Senior Notes (“2 1/4% Notes”) (1)	1.1			—			1.1			—
Employee stock options and stock purchase plan (2)	0.1			—			0.1			—
Diluted weighted average shares	75.1			73.2			75.0			72.7
Basic
Basic EPS	$	0.46		$	0.32		$	0.65		$	0.41
Diluted
Diluted EPS	$	0.45		$	0.32		$	0.64		$	0.41

_______

(1) The Company's 2 ¹/₄% Notes were not included in the computation of diluted EPS for the three and six months ended June 30, 2017, because the average market price of the common stock did not exceed the conversion price and the Company only expects the conversion premium for the 2 ¹/₄% Notes to be settled in common shares.

(2) There was less than 0.1 million of common share dilution impact from employee stock options and the stock purchase plan for the three and six months ended June 30, 2017.

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Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Summary of Impact of Contracts in Progress on Statement of Operations

The following table summarizes the impact of the changes in significant contract accounting estimates on the Company’s Aerospace and Defense segment operating results:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(In millions, except per share amounts)
Net favorable effect of the changes in contract estimates on net sales	$	26.2	$	9.6	$	18.8	$	13.5
Net favorable effect of the changes in contract estimates on income before income taxes	22.0		10.3		14.1		13.7
Net favorable effect of the changes in contract estimates on net income	16.3		6.2		10.4		8.2
Net favorable effect of the changes in contract estimates on basic net income per share	0.22		0.08		0.14		0.11
Net favorable effect of the changes in contract estimates on diluted net income per share	0.21		0.08		0.14		0.11

Schedule of Contract Asset and Liability

A summary of the contract assets and liabilities is as follows:

	June 30, 2018			December 31, 2017
	(In millions)
Contract assets	$	296.3		$	310.9
Reserve for overhead rate disallowance	(43.2		)	(42.8		)
Contract assets, net of reserve	253.1			268.1
Contract liabilities	185.3			276.8
Net contract assets (liabilities), net of reserve	$	67.8		$	(8.7	)

Schedules of Percentage of Net Sales by Contract and Customer Type

The following are percentages of net sales by contract type:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Fixed-price	58	%	58	%	59	%	57	%
Cost-reimbursable	39		37		38		39
Other	3		5		3		4

The following are percentages of net sales by customer type:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018			2017
U.S. government	93	%	93	%	93	%		93	%
Non U.S. government customers	7		7		7		7	7

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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock-Based Compensation Expense by Type of Award

Total stock-based compensation expense by type of award was as follows:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(In millions)
Stock appreciation rights	$	1.4	$	—	$	0.5	$	2.4
Stock options	—		0.3		0.1		0.7
Restricted shares, service based	1.2		1.2		2.2		2.4
Restricted shares, performance based	2.5		1.8		3.6		4.4
Employee stock purchase plan	0.1		0.1		0.3		0.3
Total stock-based compensation expense	$	5.2	$	3.4	$	6.7	$	10.2

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Balance Sheet Accounts (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Fair Value of Financial Instruments

The following are measured at fair value:

			Fair value measurement at June 30, 2018
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Money market funds	$	198.5	$	198.5	$	—	$	—
Commercial paper	119.8		—		119.8		—
	$	318.3	$	198.5	$	119.8	$	—
			Fair value measurement at December 31, 2017
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Money market funds	$	155.0	$	155.0	$	—	$	—
Commercial paper	135.6		—		135.6		—
U.S. treasury notes	4.1		—		4.1		—
	$	294.7	$	155.0	$	139.7	$	—

Schedule of Estimated Fair Value and Principal Amount of Outstanding Debt

The following table summarizes the estimated fair value and principal amount for outstanding debt obligations:

	Fair Value				Principal Amount
	June 30, 2018		December 31, 2017		June 30, 2018		December 31, 2017
	(In millions)
Term loan	$	360.0	$	370.0	$	360.0	$	370.0
2 1/4% Notes	388.9		415.3		300.0		300.0
Capital leases	1.8		0.9		1.8		0.9
	$	750.7	$	786.2	$	661.8	$	670.9

Schedule of Accounts Receivable

Accounts Receivable

	June 30, 2018		December 31, 2017
	(In millions)
Billed receivables under long-term contracts	$	133.6	$	63.8
Other receivables	1.0		0.7
Accounts receivable	$	134.6	$	64.5

Schedule of Other Current Assets, net

Other Current Assets, net

	June 30, 2018		December 31, 2017
	(In millions)
Deferred costs recoverable from the U.S. government	$	45.3	$	51.4
Inventories	18.9		19.3
Receivable from Northrop Grumman Corporation (“Northrop”) for environmental remediation costs	6.0		6.0
Prepaid expenses	16.5		19.2
Cost-share and other receivables, net	7.1		7.5
Income taxes receivable	20.5		20.5
Other	8.9		5.2
Other current assets, net	$	123.2	$	129.1

Schedule of Property, Plant and Equipment, net

Property, Plant and Equipment, net

	June 30, 2018			December 31, 2017
	(In millions)
Land	$	71.2		$	71.2
Buildings and improvements	377.4			368.3
Machinery and equipment	492.5			493.2
Construction-in-progress	38.4			30.3
	979.5			963.0
Less: accumulated depreciation	(621.7		)	(604.0		)
Property, plant and equipment, net	$	357.8		$	359.0

Schedule of Other Noncurrent Assets, net

Other Noncurrent Assets, net

	June 30, 2018		December 31, 2017
	(In millions)
Real estate held for entitlement and leasing	$	94.9	$	94.0
Receivable from Northrop for environmental remediation costs	55.5		58.5
Deferred costs recoverable from the U.S. government	67.6		66.6
Grantor trusts	22.8		24.2
Notes receivable, net	9.0		9.0
Other	10.7		7.0
Other noncurrent assets, net	$	260.5	$	259.3

Schedule of Other Current Liabilities

Other Current Liabilities

	June 30, 2018		December 31, 2017
	(In millions)
Accrued compensation and employee benefits	$	104.2	$	113.4
Competitive improvement program obligations	14.6		15.0
Income taxes payable	136.4		0.8
Postretirement medical and life insurance benefits	4.8		4.8
Other program liabilities	33.2		6.6
Other	19.8		16.3
Other current liabilities	$	313.0	$	156.9

Schedule of Other Noncurrent Liabilities

Other Noncurrent Liabilities

	June 30, 2018		December 31, 2017
	(In millions)
Conditional asset retirement obligations	$	44.9	$	44.0
Pension benefits, non-qualified	17.2		17.6
Deferred compensation	29.3		29.4
Deferred revenue	12.4		12.7
Postretirement medical and life insurance benefits	31.4		32.7
Competitive improvement program obligations	13.7		18.4
Uncertain income tax positions	4.9		2.8
Other	20.9		13.5
Other noncurrent liabilities	$	174.7	$	171.1

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of Income Tax Provision

	Six months ended June 30,
	2018		2017
	(In millions)
Income tax provision	$	17.2	$	15.2

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Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Summary of Long-Term Debt

The 2¼% Notes consisted of the following (in millions, except years, percentages, conversion rate, and conversion price):

	June 30, 2018			December 31, 2017
Carrying value, long-term	$	251.0		$	247.2
Unamortized discount and deferred financing costs	49.0			52.8
Principal amount	$	300.0		$	300.0
Carrying amount of equity component, net of equity issuance costs	$	54.5		$	54.5
Remaining amortization period (years)	5.5			6.0
Effective interest rate	5.8		%	5.8		%
Conversion rate (shares of common stock per $1,000 principal amount)	38.4615			38.4615
Conversion price (per share of common stock)	$	26.00		$	26.00

	June 30, 2018			December 31, 2017
	(In millions)
Term loan, bearing interest at variable rates (rate of 4.34% as of June 30, 2018), maturing in June 2021	$	360.0		$	370.0
Unamortized deferred financing costs	(1.4		)	(1.7		)
Total senior debt	358.6			368.3
Senior convertible notes, bearing interest at 2.25% per annum, interest payments due in June and December, maturing in December 2023	300.0			300.0
Unamortized discount and deferred financing costs	(49.0		)	(52.8		)
Total convertible senior notes	251.0			247.2
Capital lease, payable in monthly installments, maturing in 2022	1.8			0.9
Total other debt	1.8			0.9
Total debt, net of unamortized discount and deferred financing costs	611.4			616.4
Less: Amounts due within one year	(30.4		)	(25.0		)
Total long-term debt, net of unamortized discount and deferred financing costs	$	581.0		$	591.4

Schedule of Actual Ratios and Required Ratios Under Financial Covenants

The key financial covenants are as follows:

Financial Covenant	Actual Ratios as of June 30, 2018	Required Ratios
Consolidated Interest Coverage Ratio, as defined under the Senior Credit Facility	11.75 to 1.00	Not less than: 3.00 to 1.00
Consolidated Net Leverage Ratio, as defined under the Senior Credit Facility	2.42 to 1.00	Not greater than: 3.75 to 1.00

Schedule of Interest Expense components

The following table presents the interest expense components for the 2¼% Notes:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
	(In millions)
Interest expense-contractual interest	$	1.7	$	1.7	$	3.4	$	3.4
Interest expense-amortization of debt discount	1.8		1.7		3.5		3.3
Interest expense-amortization of deferred financing costs	0.2		0.2		0.3		0.3

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Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Summary of Environmental Reserve Activity

A summary of the Company’s environmental reserve activity is shown below:

	Aerojet Rocketdyne- Sacramento			Aerojet Rocketdyne- BPOU			Other Aerojet Rocketdyne Sites			Total Aerojet Rocketdyne			Other			Total Environmental Reserve
	(In millions)
December 31, 2017	$	206.5		$	116.4		$	13.7		$	336.6		$	4.8		$	341.4
Additions	8.9			0.8			0.4			10.1			0.5			10.6
Expenditures	(10.0		)	(6.8		)	(1.0		)	(17.8		)	(0.5		)	(18.3		)
June 30, 2018	$	205.4		$	110.4		$	13.1		$	328.9		$	4.8		$	333.7

Summary of Northrop Agreement Activity

A summary of the Northrop Agreement activity is shown below (in millions):

Total reimbursable costs under the Northrop Agreement	$	189.7
Amount reimbursed to the Company through June 30, 2018	(128.2		)
Potential future cost reimbursements available	$	61.5

Summary of Financial Information for the Impact of Environmental Reserves and Recoveries

Summarized financial information for the impact of environmental reserves and recoveries to the unaudited condensed consolidated statements of operations is set forth below:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Estimated recoverable amounts under U.S. government contracts	$	3.7	$	3.8	$	7.8	$	7.7
Expense to unaudited condensed consolidated statement of operations	1.4		0.9		2.8		1.7
Total environmental reserve adjustments	$	5.1	$	4.7	$	10.6	$	9.4

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Cost Reduction Plans (Tables)

6 Months Ended

Jun. 30, 2018

Restructuring and Related Activities [Abstract]

Summary of the CIP Reserve Activity

A summary of the Company's severance and retention liabilities related to Phase I and II activity is shown below:

	Severance			Retention			Total
	(In millions)
December 31, 2017	$	30.0		$	3.4		$	33.4
Accrual	—			2.7			2.7
Payments	(5.4		)	(2.4		)	(7.8		)
June 30, 2018	$	24.6		$	3.7		$	28.3

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Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule of Components of Retirement Benefit Expense (Benefit)

Components of retirement benefits expense (income) are:

	Pension Benefits						Postretirement Medical and Life Insurance Benefits
	Three months ended June 30,
	2018			2017			2018			2017
	(In millions)
Interest cost on benefit obligation	$	12.5		$	14.4		$	0.3		$	0.3
Assumed return on plan assets	(15.1		)	(12.4		)	—			—
Amortization of prior service costs	0.1			0.1			—			—
Recognized net actuarial losses (gains)	17.6			16.9			(1.0		)	(1.0		)
Retirement benefits expense (income)	$	15.1		$	19.0		$	(0.7	)	$	(0.7	)

	Pension Benefits						Postretirement Medical and Life Insurance Benefits
	Six months ended June 30,
	2018			2017			2018			2017
	(In millions)
Interest cost on benefit obligation	$	24.9		$	28.8		$	0.6		$	0.7
Assumed return on plan assets	(30.1		)	(24.8		)	—			—
Amortization of prior service costs (credits)	0.1			0.1			(0.1		)	(0.1		)
Recognized net actuarial losses (gains)	35.3			33.9			(1.9		)	(2.0		)
Retirement benefits expense (income)	$	30.2		$	38.0		$	(1.4	)	$	(1.4	)

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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

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Unusual Items (Tables)

6 Months Ended

Jun. 30, 2018

Unusual or Infrequent Items, or Both [Abstract]

Summary of Unusual Items Expense

Total unusual items, a component of other expense (income), net in the unaudited condensed consolidated statements of operations, were as follows:

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
	(In millions)
Unusual items
Legal related matters	$	—	$	(1.3	)	$	—	$	(1.9	)
Acquisition costs	—		—			—		1.0
	$	—	$	(1.3	)	$	—	$	(0.9	)

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Adoption of Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Schedule of Impact to the Financial Statements from Adoption of ASU 2014-09

The following tables summarize the effect of adoption of the new revenue recognition standard on the Company’s unaudited condensed consolidated financial statements as of and for the three and six months ended June 30, 2018.

Condensed Consolidated Statement of Operations

(Unaudited)

	Three months ended June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions, except per share amounts)
Net sales	$	467.2		$	9.4		$	476.6
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	369.5			12.9			382.4
Selling, general and administrative expense	11.1			—			11.1
Depreciation and amortization	17.7			—			17.7
Other expense, net	0.9			—			0.9
Total operating costs and expenses	399.2			12.9			412.1
Operating income	68.0			(3.5		)	64.5
Non-operating (income) expense:
Retirement benefits expense	14.4			—			14.4
Interest income	(2.0		)	—			(2.0		)
Interest expense	8.3			—			8.3
Total non-operating expense, net	20.7			—			20.7
Income before income taxes	47.3			(3.5		)	43.8
Income tax provision	12.5			(1.1		)	11.4
Net income	$	34.8		$	(2.4	)	$	32.4
Earnings Per Share of Common Stock
Basic
Basic net income per share	$	0.46		$	(0.03	)	$	0.43
Diluted
Diluted net income per share	$	0.45		$	(0.03	)	$	0.42
Weighted average shares of common stock outstanding, basic	73.9			—			73.9
Weighted average shares of common stock outstanding, diluted	75.1			—			75.1

Condensed Consolidated Statement of Comprehensive Income

(Unaudited)

	Three months ended June 30, 2018
	As Reported		Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
Net income	$	34.8	$	(2.4	)	$	32.4
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes	12.5		—			12.5
Comprehensive income	$	47.3	$	(2.4	)	$	44.9

Condensed Consolidated Statement of Operations

(Unaudited)

	Six months ended June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions, except per share amounts)
Net sales	$	959.2		$	(13.2	)	$	946.0
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	796.3			(1.8		)	794.5
Selling, general and administrative expense	17.8			—			17.8
Depreciation and amortization	35.4			—			35.4
Other expense, net	2.1			—			2.1
Total operating costs and expenses	851.6			(1.8		)	849.8
Operating income	107.6			(11.4		)	96.2
Non-operating (income) expense:
Retirement benefits expense	28.8			—			28.8
Interest income	(3.6		)	—			(3.6		)
Interest expense	16.4			—			16.4
Total non-operating expense, net	41.6			—			41.6
Income before income taxes	66.0			(11.4		)	54.6
Income tax provision	17.2			(3.1		)	14.1
Net income	$	48.8		$	(8.3	)	$	40.5
Earnings Per Share of Common Stock
Basic
Basic net income per share	$	0.65		$	(0.11	)	$	0.54
Diluted
Diluted net income per share	$	0.64		$	(0.11	)	$	0.53
Weighted average shares of common stock outstanding, basic	73.8			—			73.8
Weighted average shares of common stock outstanding, diluted	75.0			—			75.0

Condensed Consolidated Statement of Comprehensive Income

(Unaudited)

	Six months ended June 30, 2018
	As Reported		Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
Net income	$	48.8	$	(8.3	)	$	40.5
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes	25.0		—			25.0
Comprehensive income	$	73.8	$	(8.3	)	$	65.5

Condensed Consolidated Balance Sheet

(Unaudited)

	As of June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	514.7		$	—		$	514.7
Marketable securities	44.9			—			44.9
Accounts receivable	134.6			(55.9		)	78.7
Contract assets	253.1			19.5			272.6
Other current assets, net	123.2			(10.5		)	112.7
Total Current Assets	1,070.5			(46.9		)	1,023.6
Noncurrent Assets
Property, plant and equipment, net	357.8			—			357.8
Recoverable environmental remediation costs	225.8			—			225.8
Deferred income taxes	255.5			(117.4		)	138.1
Goodwill	161.3			—			161.3
Intangible assets	78.7			—			78.7
Other noncurrent assets, net	260.5			—			260.5
Total Noncurrent Assets	1,339.6			(117.4		)	1,222.2
Total Assets	$	2,410.1		$	(164.3	)	$	2,245.8
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt	$	30.4		$	—		$	30.4
Accounts payable	104.1			—			104.1
Reserves for environmental remediation costs	34.6			—			34.6
Contract liabilities	185.3			13.9			199.2
Other current liabilities	313.0			(132.3		)	180.7
Total Current Liabilities	667.4			(118.4		)	549.0
Total Noncurrent Liabilities	1,522.6			—			1,522.6
Total Liabilities	2,190.0			(118.4		)	2,071.6
Stockholders’ Equity
Common stock	7.4			—			7.4
Other capital	509.4			—			509.4
Treasury stock at cost	(64.5		)	—			(64.5		)
Retained earnings (accumulated deficit)	15.4			(45.9		)	(30.5		)
Accumulated other comprehensive loss, net of income taxes	(247.6		)	—			(247.6		)
Total Stockholders’ Equity	220.1			(45.9		)	174.2
Total Liabilities and Stockholders’ Equity	$	2,410.1		$	(164.3	)	$	2,245.8

Condensed Consolidated Statement of Cash Flows

(Unaudited)

	Six months ended June 30, 2018
	As Reported			Effect of Adoption			Amounts Excluding Effect of Adoption
	(In millions)
Operating Activities
Net income	$	48.8		$	(8.3	)	$	40.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35.4			—			35.4
Amortization of debt discount and deferred financing costs	4.4			—			4.4
Stock-based compensation	6.7			—			6.7
Retirement benefits, net	6.7			—			6.7
Insurance proceeds	(1.9		)	—			(1.9		)
Other, net	(0.1		)	—			(0.1		)
Changes in assets and liabilities:
Accounts receivable	(40.7		)	26.5			(14.2		)
Contract assets	(7.5		)	3.0			(4.5		)
Other current assets, net	16.3			0.4			16.7
Recoverable environmental remediation costs	5.3			—			5.3
Other noncurrent assets	(1.5		)	—			(1.5		)
Accounts payable	(9.7		)	—			(9.7		)
Contract liabilities	(58.1		)	(19.5		)	(77.6		)
Other current liabilities	21.8			1.0			22.8
Deferred income taxes	2.3			(3.1		)	(0.8		)
Reserves for environmental remediation costs	(7.7		)	—			(7.7		)
Other noncurrent liabilities and other	4.0			—			4.0
Net Cash Provided by Operating Activities	24.5			—			24.5
Investing Activities
Purchases of marketable securities	(44.7		)	—			(44.7		)
Sales of marketable securities	20.1			—			20.1
Insurance proceeds	1.9			—			1.9
Capital expenditures	(12.2		)	—			(12.2		)
Net Cash Used in Investing Activities	(34.9		)	—			(34.9		)
Financing Activities
Debt repayments	(10.3		)	—			(10.3		)
Repurchase of shares for withholding taxes and option costs under employee equity plans	(2.1		)	—			(2.1		)
Proceeds from shares issued under equity plans	2.5			—			2.5
Net Cash Used in Financing Activities	(9.9		)	—			(9.9		)
Net Decrease in Cash and Cash Equivalents	(20.3		)	—			(20.3		)
Cash and Cash Equivalents at Beginning of Period	535.0			—			535.0
Cash and Cash Equivalents at End of Period	$	514.7		$	—		$	514.7

The following table summarizes the reclassifications to the December 31, 2017, balance sheet to conform to the current year’s presentation.

	As Reported		Reclassifications due to Adoption			As Adjusted
	(In millions)
ASSETS
Current Assets
Cash and cash equivalents	$	535.0	$	—		$	535.0
Marketable securities	20.0		—			20.0
Accounts receivable	215.5		(151.0		)	64.5
Inventories	136.4		(136.4		)	—
Contract assets	—		268.1			268.1
Other current assets, net	109.8		19.3			129.1
Total Current Assets	1,016.7		—			1,016.7
Total Noncurrent Assets	1,242.0		—			1,242.0
Total Assets	$	2,258.7	$	—		$	2,258.7
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Current portion of long-term debt	$	25.0	$	—		$	25.0
Accounts payable	100.9		—			100.9
Reserves for environmental remediation costs	35.2		—			35.2
Contract liabilities	—		276.8			276.8
Advance payments on contracts	237.8		(237.8		)	—
Other current liabilities	195.9		(39.0		)	156.9
Total Current Liabilities	594.8		—			594.8
Total Noncurrent Liabilities	1,561.5		—			1,561.5
Total Liabilities	2,156.3		—			2,156.3
Stockholders’ Equity
Total Stockholders’ Equity	102.4		—			102.4
Total Liabilities and Stockholders’ Equity	$	2,258.7	$	—		$	2,258.7

The following table summarizes the reclassifications to the six months ended June 30, 2017, statement of cash flows to conform to the current year’s presentation.

	As Reported			Reclassifications due to Adoption			As Adjusted
	(In millions)
Operating Activities
Net income	$	30.2		$	—		$	30.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	35.4			—			35.4
Amortization of debt discount and deferred financing costs	4.2			—			4.2
Stock-based compensation	10.2			—			10.2
Retirement benefits, net	15.4			—			15.4
Other, net	0.3			—			0.3
Changes in assets and liabilities, net of effects from acquisition in 2017:
Accounts receivable	(87.8		)	37.5			(50.3		)
Inventories	20.7			(20.7		)	—
Contract assets	—			(9.7		)	(9.7		)
Other current assets, net	19.3			(7.1		)	12.2
Recoverable environmental remediation costs	10.1			—			10.1
Other noncurrent assets	(31.5		)	—			(31.5		)
Accounts payable	12.6			—			12.6
Contract liabilities	—			(43.0		)	(43.0		)
Advance payments on contracts	(49.0		)	49.0			—
Other current liabilities	19.6			(6.0		)	13.6
Deferred income taxes	15.9			—			15.9
Reserves for environmental remediation costs	(10.8		)	—			(10.8		)
Other noncurrent liabilities and other	22.9			—			22.9
Net Cash Provided by Operating Activities	37.7			—			37.7
Investing Activities
Net Cash Used in Investing Activities	(21.1		)	—			(21.1		)
Financing Activities
Net Cash Used in Financing Activities	(13.3		)	—			(13.3		)
Net Increase in Cash and Cash Equivalents	3.3			—			3.3
Cash and Cash Equivalents at Beginning of Period	410.3			—			410.3
Cash and Cash Equivalents at End of Period	$	413.6		$	—		$	413.6

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Basis of Presentation and Nature of Operations - Narrative (Details) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Segment	Jun. 30, 2017 USD ($)
Accounting Policies [Abstract]
Number of operating segments | Segment				2
Income tax expense from remeasurement of deferred tax assets and liabilities related to Tax Cuts and Jobs Act		$ 64.6
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating income	$ 68.0		$ 61.5	$ 107.6	$ 95.9
Nonoperating expense	$ 20.7		$ 25.3	$ 41.6	50.5
Reclassifications due to Adoption | ASU 2017-07 - NPPC
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating income					36.6
Nonoperating expense					$ 36.6

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Basis of Presentation and Nature of Operations - AR1 Research and Development (Details) - U.S. Air Force - Liquid Booster Engine Development Project - USD ($) $ in Millions	3 Months Ended	42 Months Ended
	Mar. 31, 2018	Jun. 30, 2018
U.S. Government Contractual Arrangements
Research and Development Arrangement, Contract to Perform for Others [Line Items]
AR1 research and development	$ 6.7	$ 56.1
AR1 R&D costs incurred		290.1
AR1 R&D costs net of reimbursements		88.2
Research and development expense		32.1
U.S. Government Contractual Arrangements | U.S. Air Force
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Investment percentage of total funding required	66.67%
Customer funding to offset costs incurred, amount collected		(192.3)
U.S. Government Contractual Arrangements | Aerojet Rocketdyne and United Launch Alliance
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Agreement value	$ 804.0
U.S. Government Contractual Arrangements | United Launch Alliance
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Customer funding to offset costs incurred, amount collected		$ (9.6)
U.S. Government Contractual Arrangements - Modified June 2018 | U.S. Air Force
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Investment percentage of total funding required		83.33%
U.S. Government Contractual Arrangements - Modified June 2018 | Aerojet Rocketdyne and United Launch Alliance
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Agreement value		$ 353.8

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Income Per Share of Common Stock - Reconciliation of Numerator and Denominator (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income	$ 34.8	$ 24.3	$ 48.8	$ 30.2
Income allocated to participating securities, basic	(0.8)	(0.5)	(1.0)	(0.7)
Net income for basic earnings per share	34.0	23.8	47.8	29.5
Interest on 4 1/16% Convertible Subordinated Debentures (“4 1/16% Debentures”)	0.0	0.0	0.0	0.1
Net income for diluted earnings per share	$ 34.0	$ 23.8	$ 47.8	$ 29.6
Denominator:
Basic weighted average shares (in shares)	73.9	73.2	73.8	72.6
Effect of:
Employee stock options and stock purchase plan (in shares)	0.1	0.0	0.1	0.0
Diluted weighted average shares (in shares)	75.1	73.2	75.0	72.7
Basic
Net favorable effect of the changes in contract estimates on basic net income per share	$ 0.46	$ 0.32	$ 0.65	$ 0.41
Diluted
Net favorable effect of the changes in contract estimates on diluted net income per share	$ 0.45	$ 0.32	$ 0.64	$ 0.41
4.0625% Debentures
Effect of:
Convertible subordinated notes	0.0	0.0	0.0	0.1
2 1/4% Notes
Effect of:
Convertible subordinated notes	1.1	0.0	1.1	0.0
Diluted
Debt instrument interest rate stated percentage	2.25%		2.25%
Convertible Debt Securities | 4.0625% Debentures
Diluted
Debt instrument interest rate stated percentage	4.0625%		4.0625%

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Revenue Recognition - Schedule of Impact of the Change in Contract Estimates on Operating Results (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Change in Accounting Estimate [Line Items]
Net favorable effect of the changes in contract estimates on net sales	$ 467.2	$ 459.6	$ 959.2	$ 864.9
Net favorable effect of the changes in contract estimates on income before income taxes	47.3	36.2	66.0	45.4
Net favorable effect of the changes in contract estimates on net income	$ 34.8	$ 24.3	$ 48.8	$ 30.2
Net favorable effect of the changes in contract estimates on basic net income per share	$ 0.46	$ 0.32	$ 0.65	$ 0.41
Net favorable effect of the changes in contract estimates on diluted net income per share	$ 0.45	$ 0.32	$ 0.64	$ 0.41
Aerospace and Defense | Contracts Accounted for under Percentage-of-Completion
Change in Accounting Estimate [Line Items]
Net favorable effect of the changes in contract estimates on net sales	$ 26.2	$ 9.6	$ 18.8	$ 13.5
Net favorable effect of the changes in contract estimates on income before income taxes	22.0	10.3	14.1	13.7
Net favorable effect of the changes in contract estimates on net income	$ 16.3	$ 6.2	$ 10.4	$ 8.2
Net favorable effect of the changes in contract estimates on basic net income per share	$ 0.22	$ 0.08	$ 0.14	$ 0.11
Net favorable effect of the changes in contract estimates on diluted net income per share	$ 0.21	$ 0.08	$ 0.14	$ 0.11

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Revenue Recognition - Schedule of Contract Asset and Liability (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Revenue from Contract with Customer [Abstract]
Contract assets	$ 296.3	$ 310.9
Reserve for overhead rate disallowance	(43.2)	(42.8)
Contract assets, net of reserve	253.1	268.1
Contract liabilities	185.3	276.8
Net contract assets (liabilities), net of reserve	$ 67.8	$ (8.7)

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Revenue Recognition - Schedule of Percentage of Sales by Contract and Customer (Details) - Sales Revenue, Net	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Customers | U.S. government
Concentration Risk [Line Items]
Percentage of net sales	93.00%	93.00%	93.00%	93.00%
Customers | Non U.S. government customers
Concentration Risk [Line Items]
Percentage of net sales	7.00%	7.00%	7.00%	7.00%
Segment | Real Estate
Concentration Risk [Line Items]
Percentage of net sales			1.00%	1.00%
Fixed-price | Contract
Concentration Risk [Line Items]
Percentage of net sales	58.00%	58.00%	59.00%	57.00%
Cost-reimbursable | Contract
Concentration Risk [Line Items]
Percentage of net sales	39.00%	37.00%	38.00%	39.00%
Other | Contract
Concentration Risk [Line Items]
Percentage of net sales	3.00%	5.00%	3.00%	4.00%

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Revenue Recognition - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Increase in net contract assets (liabilities) during period		$ 76.5
Revenue recognized that was previously in contract liabilities	$ 68.0	200.5
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	3,900.0	3,900.0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,900.0	$ 1,900.0
Percentage of remaining performance obligations expected to be satisfied	48.00%	48.00%
Period for remaining performance obligation expected timing of satisfaction	1 year	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining performance obligations expected to be satisfied	28.00%	28.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Percentage of remaining performance obligations expected to be satisfied	24.00%	24.00%
Period for remaining performance obligation expected timing of satisfaction	1 year	1 year

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Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 5.2	$ 3.4	$ 6.7	$ 10.2
Stock appreciation rights
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1.4	0.0	0.5	2.4
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	0.0	0.3	0.1	0.7
Restricted shares, service based
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1.2	1.2	2.2	2.4
Restricted shares, performance based
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	2.5	1.8	3.6	4.4
Employee stock purchase plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 0.1	$ 0.1	$ 0.3	$ 0.3

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Balance Sheet Accounts - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	$ 318.3	$ 294.7
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	198.5	155.0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	119.8	139.7
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	0.0	0.0
Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	198.5	155.0
Money Market Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	198.5	155.0
Money Market Funds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	0.0	0.0
Money Market Funds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	0.0	0.0
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	119.8	135.6
Commercial paper | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	0.0	0.0
Commercial paper | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	119.8	135.6
Commercial paper | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	0.0	0.0
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets		4.1
Commercial paper | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets		0.0
Commercial paper | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets		4.1
Commercial paper | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets		0.0
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		119.7
Cash and Cash Equivalents | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	74.9
Marketable Securities, Current
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities		$ 20.0
Marketable Securities, Current | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	$ 44.9

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Balance Sheet Accounts - Schedule of Estimated Fair Value and Principal Amount of Outstanding Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Fair Value	$ 750.7	$ 786.2
Principal Amount	661.8	670.9
Term loan
Debt Instrument [Line Items]
Fair Value	360.0	370.0
Principal Amount	360.0	370.0
2 1/4% Notes
Debt Instrument [Line Items]
Fair Value	388.9	415.3
Principal Amount	300.0	300.0
Capital leases
Debt Instrument [Line Items]
Fair Value	1.8	0.9
Principal Amount	$ 1.8	$ 0.9

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Balance Sheet Accounts - Schedule of Accounts Receivable (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Billed receivables under long-term contracts	$ 133.6	$ 63.8
Other receivables	1.0	0.7
Accounts receivable	$ 134.6	64.5
Contract asset
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of unbilled receivables net of reserves to contract assets		$ 151.0

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Balance Sheet Accounts - Schedule of Other Current Assets, net (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred costs recoverable from the U.S. government	$ 45.3	$ 51.4
Inventories	18.9	19.3
Receivable from Northrop Grumman Corporation (“Northrop”) for environmental remediation costs	6.0	6.0
Prepaid expenses	16.5	19.2
Cost-share and other receivables, net	7.1	7.5
Income taxes receivable	20.5	20.5
Other	8.9	5.2
Other current assets, net	$ 123.2	129.1
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of inventories to contract assets		0.0
Contract asset
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of inventories to contract assets		$ 117.1

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Balance Sheet Accounts - Schedule of Property, Plant and Equipment, net (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 979.5	$ 963.0
Less: accumulated depreciation	(621.7)	(604.0)
Property, plant and equipment, net	357.8	359.0
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	71.2	71.2
Buildings and Improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	377.4	368.3
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	492.5	493.2
Construction-in-Progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 38.4	$ 30.3

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Balance Sheet Accounts - Schedule of Other Noncurrent Assets, net (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Real estate held for entitlement and leasing	$ 94.9	$ 94.0
Receivable from Northrop for environmental remediation costs	55.5	58.5
Deferred costs recoverable from the U.S. government	67.6	66.6
Grantor trusts	22.8	24.2
Notes receivable, net	9.0	9.0
Other	10.7	7.0
Other noncurrent assets, net	$ 260.5	$ 259.3

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Balance Sheet Accounts - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued compensation and employee benefits	$ 104.2		$ 113.4
Competitive improvement program obligations	14.6		15.0
Income taxes payable	136.4		0.8
Postretirement medical and life insurance benefits	4.8		4.8
Other program liabilities	33.2		6.6
Other	19.8		16.3
Other current liabilities	313.0		156.9
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of other current liabilities to contract liabilities	$ 313.0		156.9
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected a decrease in income tax payable upon IRS consent		$ 105.0
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected a decrease in income tax payable upon IRS consent		$ 115.0
Contract liabilities
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other current liabilities			39.0
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of other current liabilities to contract liabilities			$ 39.0

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Balance Sheet Accounts - Schedule of Other Noncurrent Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Conditional asset retirement obligations	$ 44.9	$ 44.0
Pension benefits, non-qualified	17.2	17.6
Deferred compensation	29.3	29.4
Deferred revenue	12.4	12.7
Postretirement medical and life insurance benefits	31.4	32.7
Competitive improvement program obligations	13.7	18.4
Uncertain income tax positions	4.9	2.8
Other	20.9	13.5
Other noncurrent liabilities	$ 174.7	$ 171.1

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income tax provision	$ 12.5	$ 11.9	$ 17.2	$ 15.2
Effective income tax rate			26.10%	33.50%

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Long-term Debt - Summary of Long-term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Carrying value, long-term	$ 661.8	$ 670.9
Capital lease, payable in monthly installments, maturing in 2022	1.8	0.9
Total debt, net of unamortized discount and deferred financing costs	611.4	616.4
Less: Amounts due within one year	(30.4)	(25.0)
Total long-term debt, net of unamortized discount and deferred financing costs	581.0	591.4
Line of Credit
Debt Instrument [Line Items]
Long-term debt, gross	360.0	370.0
Unamortized discount and deferred financing costs	(1.4)	(1.7)
Carrying value, long-term	$ 358.6	368.3
Effective interest rate	4.34%
Convertible Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 300.0	300.0
Unamortized discount and deferred financing costs	(49.0)	(52.8)
Carrying value, long-term	$ 251.0	247.2
Debt instrument interest rate stated percentage	2.25%
Capital leases
Debt Instrument [Line Items]
Long-term debt, gross	$ 1.8	$ 0.9

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Long-term Debt - Narrative - Senior Credit Facility (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 17, 2016
Debt Instrument [Line Items]
Outstanding balance	$ 661,800,000	$ 670,900,000
Line of Credit
Debt Instrument [Line Items]
Outstanding balance	358,600,000	$ 368,300,000
Line of Credit | Senior Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 750,000,000.0
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			350,000,000.0
Long-term line of credit	0
Line of Credit | Term loan
Debt Instrument [Line Items]
Maximum borrowing capacity			400,000,000.0
Outstanding balance	360,000,000
Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			100,000,000.0
Outstanding letters of credit	$ 38,400,000
Line of Credit | Bridge Loan
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 10,000,000.0

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Long-term Debt - Schedule of Actual Ratios and Required Ratios Under Financial Covenants (Details) - Senior Credit Facility	6 Months Ended
	Jun. 30, 2018
Debt Instrument [Line Items]
Interest coverage ratio, as defined under the Senior Credit Facility	11.75
Leverage ratio, as defined under the Senior Credit Facility	2.42
Minimum
Debt Instrument [Line Items]
Required coverage ratio	3.00
Maximum
Debt Instrument [Line Items]
Required leverage ratio	3.75

XML

Long-term Debt - 2.25% Convertible Senior Notes (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) $ / shares
Debt Instrument [Line Items]
Carrying value, long-term	$ 661,800,000		$ 661,800,000		$ 670,900,000
Share price (in USD per share) | $ / shares	$ 29.49		$ 29.49
Interest expense components for 2 1/4% Notes
Interest expense-contractual interest	$ 1,700,000	$ 1,700,000	$ 3,400,000	$ 3,400,000
Interest expense-amortization of debt discount	1,800,000	1,700,000	3,500,000	3,300,000
Interest expense-amortization of deferred financing costs	200,000	$ 200,000	300,000	$ 300,000
2 1/4% Notes
Debt Instrument [Line Items]
Principal amount	300,000,000.0		300,000,000.0
Debt issuance costs	5,800,000		5,800,000
Carrying value, long-term	$ 300,000,000		$ 300,000,000		300,000,000
Effective interest rate	5.80%		5.80%
Convertible Debt
Debt Instrument [Line Items]
Carrying value, long-term	$ 251,000,000		$ 251,000,000		247,200,000
Principal amount	300,000,000		300,000,000		300,000,000
Convertible Debt | 2 1/4% Notes
Debt Instrument [Line Items]
Carrying value, long-term	251,000,000		251,000,000		247,200,000
Unamortized discount and deferred financing costs	49,000,000		49,000,000		52,800,000
Principal amount	300,000,000		300,000,000		300,000,000
Carrying amount of equity component, net of equity issuance costs	$ 54,500,000		$ 54,500,000		$ 54,500,000
Remaining amortization period (years)			5 years 6 months		6 years
Effective interest rate	5.80%		5.80%		5.80%
Conversion rate (shares of common stock per $1,000 principal amount)			38.4615		38.4615
Conversion price (in dollars per share of common stock) | $ / shares	$ 26.00		$ 26.00		$ 26.00
Debt Component of Convertible Debt | 2 1/4% Notes
Debt Instrument [Line Items]
Debt issuance costs	$ 4,700,000		$ 4,700,000
If-converted value in excess of principal			40,300,000
Equity Component of Convertible Debt | 2 1/4% Notes
Debt Instrument [Line Items]
Debt issuance costs	$ 1,100,000		$ 1,100,000

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Long-term Debt - Capital Leases (Details) ft² in Thousands, $ in Millions	1 Months Ended
	Dec. 31, 2018 USD ($)	Jul. 31, 2018 USD ($) ft²	Jun. 30, 2018 USD ($)	Oct. 31, 2017 ft²
Office Building
Property, Plant and Equipment [Line Items]
Present value of net minimum payments			$ 24.9
Manufacturing Facility
Property, Plant and Equipment [Line Items]
Area of of real property | ft²				136
Present value of net minimum payments			$ 21.0
Scenario, Forecast | Office Building
Property, Plant and Equipment [Line Items]
Area of of real property | ft²		122
Term of capital lease contract		20 years
Future minimum payments		$ 47.8
Scenario, Forecast | Manufacturing Facility
Property, Plant and Equipment [Line Items]
Term of capital lease contract	31 years
Future minimum payments	$ 34.7

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Commitments and Contingencies - Narrative - Legal Matters (Details)	Jun. 30, 2018 LegalMatter
Asbestos Litigation
Loss Contingencies [Line Items]
Unresolved asbestos cases pending	54

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Commitments and Contingencies - Narrative - Environmental Matters (Details)			6 Months Ended	12 Months Ended
	May 09, 2017	Jun. 30, 2000 respondent water_company	Jun. 30, 2018 USD ($) LegalMatter	Dec. 31, 2002 USD ($) a	Dec. 31, 2017 USD ($)	Oct. 31, 2001 USD ($)
Site Contingency [Line Items]
Accrued environmental costs			$ 333,700,000		$ 341,400,000
Guarantee obligations			$ 120,000,000
Various Environmental Matters
Site Contingency [Line Items]
Number of environmental remediation matters (over) | LegalMatter			40
Environmental remediation term			15 years
Accrued environmental costs			$ 333,700,000
Environmental obligation funding percent			99.00%
Various Environmental Matters | Minimum
Site Contingency [Line Items]
Estimated environmental costs			$ 333,700,000
Various Environmental Matters | Maximum
Site Contingency [Line Items]
Estimated environmental costs			493,100,000
Various Environmental Matters | Sacramento, California
Site Contingency [Line Items]
Accrued environmental costs			205,400,000
Various Environmental Matters | Sacramento, California | Environmental Protection Agency
Site Contingency [Line Items]
Non-contaminated land | a				2,600
Various Environmental Matters | Sacramento, California | Minimum
Site Contingency [Line Items]
Estimated environmental costs			205,400,000
Various Environmental Matters | Sacramento, California | Maximum
Site Contingency [Line Items]
Estimated environmental costs			325,400,000
Guarantee obligations				$ 75,000,000
Various Environmental Matters | Sacramento, California | As Reported
Site Contingency [Line Items]
Guarantee obligations				$ 20,000,000
Various Environmental Matters | Baldwin Park Operable Unit
Site Contingency [Line Items]
Accrued environmental costs			$ 110,400,000
Guarantee obligations						$ 25,000,000
Management agreement terms	10 years
Various Environmental Matters | Baldwin Park Operable Unit | Aerojet Rocketdyne, Inc.
Site Contingency [Line Items]
Percentage of responsibility in all project costs			74.00%
Various Environmental Matters | Baldwin Park Operable Unit | Environmental Protection Agency
Site Contingency [Line Items]
Number of respondents | respondent		7
Number of water companies | water_company		5
Various Environmental Matters | Baldwin Park Operable Unit | Minimum
Site Contingency [Line Items]
Estimated environmental costs			$ 110,400,000
Various Environmental Matters | Baldwin Park Operable Unit | Maximum
Site Contingency [Line Items]
Estimated environmental costs			$ 140,800,000

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Commitments and Contingencies - Narrative - Environmental Reserves and Estimated Recoveries (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Nov. 30, 2003	Jun. 30, 2017
Site Contingency [Line Items]
Non-reimbursable percentage of environmental costs	24.00%
Northrop
Site Contingency [Line Items]
Current annual billing limitation	$ 6,000,000
Reimbursable remediation cost	$ 189,700,000
Northrop | Maximum
Site Contingency [Line Items]
Reimbursable remediation cost			$ 189,700,000
Atlantic Research Corporation
Site Contingency [Line Items]
Pre-close environmental costs		$ 20,000,000.0
Various Environmental Matters
Site Contingency [Line Items]
Environmental remediation term	15 years

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Commitments and Contingencies - Summary of Environmental Reserve Activity (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 341.4
Additions	10.6
Expenditures	(18.3)
Ending balance	333.7
Aerojet Rocketdyne- Sacramento
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	206.5
Additions	8.9
Expenditures	(10.0)
Ending balance	205.4
Aerojet Rocketdyne- BPOU
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	116.4
Additions	0.8
Expenditures	(6.8)
Ending balance	110.4
Other Aerojet Rocketdyne Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	13.7
Additions	0.4
Expenditures	(1.0)
Ending balance	13.1
Total Aerojet Rocketdyne
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	336.6
Additions	10.1
Expenditures	(17.8)
Ending balance	328.9
Other
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	4.8
Additions	0.5
Expenditures	(0.5)
Ending balance	$ 4.8

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Commitments and Contingencies - Summary of Northrop Agreement Activity (Details) - Northrop $ in Millions	Jun. 30, 2018 USD ($)
Contingencies And Commitments [Line Items]
Total reimbursable costs under the Northrop Agreement	$ 189.7
Amount reimbursed to the Company through June 30, 2018	(128.2)
Potential future cost reimbursements available	$ 61.5

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Commitments and Contingencies - Summary of Financial Information for the Impact of Environmental Reserves and Recoveries (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Estimated Recoverable Amounts Under U.S. Government Contracts	$ 3.7	$ 3.8	$ 7.8	$ 7.7
Expense to Unaudited Condensed Consolidated Statement of Operations	1.4	0.9	2.8	1.7
Total Environmental Reserve Adjustments	$ 5.1	$ 4.7	$ 10.6	$ 9.4

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Arrangements with Off-Balance Sheet Risk - Narrative (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding surety bonds	$ 53.6
Guarantee obligations	$ 120.0
Product warranty period	1 year
Capital leases | Building
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contractual obligation	$ 82.5
Letter of Credit | Line of Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Outstanding commercial letters of credit	$ 38.4

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Cost Reduction Plans - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Estimated restructuring and related costs over next four years	$ 235.1
Capital expenditures expected over next four years	60.5
Restructuring plan cost	97.9
Capital expenditures to support the CIP	36.6
Accelerated depreciation	$ 0.7	$ 2.2

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Cost Reduction Plans - Summary of the CIP Reserve Activity (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 33.4
Accrual	2.7
Payments	(7.8)
Ending balance	28.3
Severance
Restructuring Cost and Reserve [Line Items]
Beginning balance	30.0
Accrual	0.0
Payments	(5.4)
Ending balance	24.6
Retention
Restructuring Cost and Reserve [Line Items]
Beginning balance	3.4
Accrual	2.7
Payments	(2.4)
Ending balance	$ 3.7

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Retirement Benefits - Schedule of Components of Retirement Benefit Expense (Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation	$ 12.5	$ 14.4	$ 24.9	$ 28.8
Assumed return on plan assets	(15.1)	(12.4)	(30.1)	(24.8)
Amortization of prior service costs	0.1	0.1	0.1	0.1
Recognized net actuarial losses (gains)	17.6	16.9	35.3	33.9
Retirement benefits expense (income)	15.1	19.0	30.2	38.0
Pension Benefits | Restatement adjustment
Defined Benefit Plan Disclosure [Line Items]
Assumed return on plan assets		(3.8)		(7.5)
Reclassification of service cost to assumed return on plan assets		3.8		7.5
Postretirement Medical and Life Insurance Benefits
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation	0.3	0.3	0.6	0.7
Assumed return on plan assets	0.0	0.0	0.0	0.0
Amortization of prior service costs	0.0	0.0	(0.1)	(0.1)
Recognized net actuarial losses (gains)	(1.0)	(1.0)	(1.9)	(2.0)
Retirement benefits expense (income)	$ (0.7)	$ (0.7)	$ (1.4)	$ (1.4)

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Operating Segments and Related Disclosures - Narrative (Details)	6 Months Ended
	Jun. 30, 2018 Segment
Segment Reporting [Abstract]
Number of operating segments	2

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Operating Segments and Related Disclosures - Schedule of Selected Financial Information for Each Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Sales:
Net sales	$ 467.2	$ 459.6	$ 959.2	$ 864.9
Reconciliation of segment performance to income before income taxes:
Segment performance	68.0	61.5	107.6	95.9
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)
Unusual items	0.0	1.3	0.0	0.9
Income before income taxes	47.3	36.2	66.0	45.4
Operating Segments
Net Sales:
Net sales	467.2	459.6	959.2	864.9
Reconciliation of segment performance to income before income taxes:
Segment performance	67.9	57.0	102.8	92.5
Operating Segments | Aerospace and Defense
Net Sales:
Net sales	465.6	458.0	956.0	861.7
Segment Performance:
Operating profit	69.5	58.8	106.1	97.0
Environmental remediation provision adjustments	(1.0)	(0.5)	(2.3)	(1.1)
Retirement benefits, net	(1.2)	(3.4)	(2.2)	(6.9)
Reconciliation of segment performance to income before income taxes:
Segment performance	67.3	56.2	101.6	90.9
Unusual items	0.0	1.3	0.0	1.9
Operating Segments | Real Estate
Net Sales:
Net sales	1.6	1.6	3.2	3.2
Reconciliation of segment performance to income before income taxes:
Segment performance	0.6	0.8	1.2	1.6
Segment Reconciling Items
Reconciliation of segment performance to income before income taxes:
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)
Unusual items	0.0	0.0	0.0	(1.0)
Corporate, Non-Segment
Segment Performance:
Retirement benefits, net	(3.3)	(5.0)	(6.6)	(10.0)
Reconciliation of segment performance to income before income taxes:
Corporate and other expense, net	$ (5.8)	$ (5.4)	$ (10.7)	$ (12.0)

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Operating Segments and Related Disclosures - Summary of Customers that Represented More than 10% of Net Sales (Details) - Customers - Sales Revenue, Net	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Lockheed Martin Corporation
Revenue, Major Customer [Line Items]
Percentage of net sales	29.00%	24.00%	29.00%	21.00%
United Launch Alliance
Revenue, Major Customer [Line Items]
Percentage of net sales	19.00%	23.00%	19.00%	23.00%
NASA
Revenue, Major Customer [Line Items]
Percentage of net sales	19.00%	18.00%	18.00%	18.00%
Raytheon Company
Revenue, Major Customer [Line Items]
Percentage of net sales	15.00%	14.00%	18.00%	16.00%

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Unusual Items - Summary of Unusual Items Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Unusual or Infrequent Items, or Both [Abstract]
Legal related matters	$ 0.0	$ (1.3)	$ 0.0	$ (1.9)
Acquisition costs	0.0	0.0	0.0	1.0
Total unusual items	$ 0.0	$ (1.3)	$ 0.0	$ (0.9)

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Adoption of Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of net sales accounted for using unit-of-delivery method	48.00%
Reduction in remaining performance obligations due to adoption of ASU 2014-09		$ (3,900.0)
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting guidance	$ 37.6
ASU 2014-09 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of change in accounting guidance	37.6
Effect of Adoption | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction in remaining performance obligations due to adoption of ASU 2014-09	$ 600.0

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Adoption of Revenue Recognition - Effect of Revenue Recognition on Condensed Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	$ 467.2	$ 459.6	$ 959.2	$ 864.9
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	369.5	370.6	796.3	710.0
Selling, general and administrative expense	11.1	9.7	17.8	23.2
Depreciation and amortization	17.7	19.1	35.4	35.4
Other expense (income), net	0.9	(1.3)	2.1	0.4
Total operating costs and expenses	399.2	398.1	851.6	769.0
Operating income	68.0	61.5	107.6	95.9
Non-operating (income) expense:
Retirement benefits expense	14.4	18.3	28.8	36.6
Interest income	(2.0)	(0.8)	(3.6)	(1.3)
Interest expense	8.3	7.8	16.4	15.2
Total non-operating expense, net	20.7	25.3	41.6	50.5
Income before income taxes	47.3	36.2	66.0	45.4
Income tax provision	12.5	11.9	17.2	15.2
Net income	$ 34.8	$ 24.3	$ 48.8	$ 30.2
Basic
Net favorable effect of the changes in contract estimates on basic net income per share	$ 0.46	$ 0.32	$ 0.65	$ 0.41
Diluted
Net favorable effect of the changes in contract estimates on diluted net income per share	$ 0.45	$ 0.32	$ 0.64	$ 0.41
Weighted average shares of common stock outstanding, basic (in shares)	73.9	73.2	73.8	72.6
Weighted average shares of common stock outstanding, diluted (in shares)	75.1	73.2	75.0	72.7
Effect of Adoption | ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	$ 9.4		$ (13.2)
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	12.9		(1.8)
Selling, general and administrative expense	0.0		0.0
Depreciation and amortization	0.0		0.0
Other expense (income), net	0.0		0.0
Total operating costs and expenses	12.9		(1.8)
Operating income	(3.5)		(11.4)
Non-operating (income) expense:
Retirement benefits expense	0.0		0.0
Interest income	0.0		0.0
Interest expense	0.0		0.0
Total non-operating expense, net	0.0		0.0
Income before income taxes	(3.5)		(11.4)
Income tax provision	(1.1)		(3.1)
Net income	$ (2.4)		$ (8.3)
Basic
Net favorable effect of the changes in contract estimates on basic net income per share	$ (0.03)		$ (0.11)
Diluted
Net favorable effect of the changes in contract estimates on diluted net income per share	$ (0.03)		$ (0.11)
Weighted average shares of common stock outstanding, basic (in shares)	0.0		0.0
Weighted average shares of common stock outstanding, diluted (in shares)	0.0		0.0
Amounts Excluding Effect of Adoption
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net sales	$ 476.6		$ 946.0
Operating costs and expenses:
Cost of sales (exclusive of items shown separately below)	382.4		794.5
Selling, general and administrative expense	11.1		17.8
Depreciation and amortization	17.7		35.4
Other expense (income), net	0.9		2.1
Total operating costs and expenses	412.1		849.8
Operating income	64.5		96.2
Non-operating (income) expense:
Retirement benefits expense	14.4		28.8
Interest income	(2.0)		(3.6)
Interest expense	8.3		16.4
Total non-operating expense, net	20.7		41.6
Income before income taxes	43.8		54.6
Income tax provision	11.4		14.1
Net income	$ 32.4		$ 40.5
Basic
Net favorable effect of the changes in contract estimates on basic net income per share	$ 0.43		$ 0.54
Diluted
Net favorable effect of the changes in contract estimates on diluted net income per share	$ 0.42		$ 0.53
Weighted average shares of common stock outstanding, basic (in shares)	73.9		73.8
Weighted average shares of common stock outstanding, diluted (in shares)	75.1		75.0

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Adoption of Revenue Recognition - Effect of Revenue Recognition on Condensed Consolidated Statement of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income	$ 34.8	$ 24.3	$ 48.8	$ 30.2
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes	12.5	9.4	25.0	19.1
Comprehensive income	47.3	$ 33.7	73.8	$ 49.3
Effect of Adoption | ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income	(2.4)		(8.3)
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes	0.0		0.0
Comprehensive income	(2.4)		(8.3)
Amounts Excluding Effect of Adoption
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net income	32.4		40.5
Other comprehensive income:
Amortization of actuarial losses and prior service credits, net of income taxes	12.5		25.0
Comprehensive income	$ 44.9		$ 65.5

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Adoption of Revenue Recognition - Effect of Revenue Recognition on Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 514.7	$ 535.0	$ 413.6	$ 410.3
Marketable securities	44.9	20.0
Accounts receivable	134.6	64.5
Contract assets	253.1	268.1
Other current assets, net	123.2	129.1
Total Current Assets	1,070.5	1,016.7
Noncurrent Assets
Property, plant and equipment, net	357.8	359.0
Recoverable environmental remediation costs	225.8	231.1
Deferred income taxes	255.5	145.8
Goodwill	161.3	161.3
Intangible assets	78.7	85.5
Other noncurrent assets, net	260.5	259.3
Total Noncurrent Assets	1,339.6	1,242.0
Total Assets	2,410.1	2,258.7
Current Liabilities
Current portion of long-term debt	30.4	25.0
Accounts payable	104.1	100.9
Reserves for environmental remediation costs	34.6	35.2
Contract liabilities	185.3	276.8
Other current liabilities	313.0	156.9
Total Current Liabilities	667.4	594.8
Total Noncurrent Liabilities	1,522.6	1,561.5
Total Liabilities	2,190.0	2,156.3
Stockholders’ Equity
Common stock	7.4	7.4
Other capital	509.4	503.1
Treasury stock at cost	(64.5)	(64.5)
Retained earnings (accumulated deficit)	15.4	(71.0)
Accumulated other comprehensive loss, net of income taxes	(247.6)	(272.6)
Total Stockholders’ Equity	220.1	102.4
Total Liabilities and Stockholders’ Equity	2,410.1	2,258.7
Effect of Adoption | ASU 2014-09
Current Assets
Cash and cash equivalents	0.0	0.0
Marketable securities	0.0
Accounts receivable	(55.9)
Contract assets	19.5
Other current assets, net	(10.5)
Total Current Assets	(46.9)
Noncurrent Assets
Property, plant and equipment, net	0.0
Recoverable environmental remediation costs	0.0
Deferred income taxes	(117.4)
Goodwill	0.0
Intangible assets	0.0
Other noncurrent assets, net	0.0
Total Noncurrent Assets	(117.4)
Total Assets	(164.3)
Current Liabilities
Current portion of long-term debt	0.0
Accounts payable	0.0
Reserves for environmental remediation costs	0.0
Contract liabilities	13.9
Other current liabilities	(132.3)
Total Current Liabilities	(118.4)
Total Noncurrent Liabilities	0.0
Total Liabilities	(118.4)
Stockholders’ Equity
Common stock	0.0
Other capital	0.0
Treasury stock at cost	0.0
Retained earnings (accumulated deficit)	(45.9)
Accumulated other comprehensive loss, net of income taxes	0.0
Total Stockholders’ Equity	(45.9)
Total Liabilities and Stockholders’ Equity	(164.3)
Amounts Excluding Effect of Adoption
Current Assets
Cash and cash equivalents	514.7	$ 535.0
Marketable securities	44.9
Accounts receivable	78.7
Contract assets	272.6
Other current assets, net	112.7
Total Current Assets	1,023.6
Noncurrent Assets
Property, plant and equipment, net	357.8
Recoverable environmental remediation costs	225.8
Deferred income taxes	138.1
Goodwill	161.3
Intangible assets	78.7
Other noncurrent assets, net	260.5
Total Noncurrent Assets	1,222.2
Total Assets	2,245.8
Current Liabilities
Current portion of long-term debt	30.4
Accounts payable	104.1
Reserves for environmental remediation costs	34.6
Contract liabilities	199.2
Other current liabilities	180.7
Total Current Liabilities	549.0
Total Noncurrent Liabilities	1,522.6
Total Liabilities	2,071.6
Stockholders’ Equity
Common stock	7.4
Other capital	509.4
Treasury stock at cost	(64.5)
Retained earnings (accumulated deficit)	(30.5)
Accumulated other comprehensive loss, net of income taxes	(247.6)
Total Stockholders’ Equity	174.2
Total Liabilities and Stockholders’ Equity	$ 2,245.8

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Adoption of Revenue Recognition - Effect of Revenue Recognition on Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income	$ 34.8		$ 24.3	$ 48.8	$ 30.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17.7		19.1	35.4	35.4
Amortization of debt discount and deferred financing costs				4.4	4.2
Stock-based compensation	5.2		3.4	6.7	10.2
Retirement benefits, net				6.7	15.4
Insurance proceeds				(1.9)	0.0
Other, net				(0.1)	0.3
Changes in assets and liabilities:
Accounts receivable				(40.7)	(50.3)
Contract assets				(7.5)	(9.7)
Other current assets, net				16.3	12.2
Recoverable environmental remediation costs				5.3	10.1
Other noncurrent assets				(1.5)	(31.5)
Accounts payable				(9.7)	12.6
Contract liabilities				(58.1)	(43.0)
Other current liabilities				21.8	13.6
Deferred income taxes				2.3	15.9
Reserves for environmental remediation costs				(7.7)	(10.8)
Other noncurrent liabilities and other				4.0	22.9
Net Cash Provided by Operating Activities				24.5	37.7
Investing Activities
Purchases of marketable securities				(44.7)	0.0
Sales of marketable securities				20.1	0.0
Insurance proceeds				1.9	0.0
Capital expenditures				(12.2)	(6.1)
Net Cash Used in Investing Activities				(34.9)	(21.1)
Financing Activities
Debt repayments				(10.3)	(10.0)
Repurchase of shares for withholding taxes and option costs under employee equity plans				(2.1)	(5.7)
Proceeds from shares issued under equity plans				2.5	2.4
Net Cash Used in Financing Activities				(9.9)	(13.3)
Net (Decrease) Increase in Cash and Cash Equivalents				(20.3)	3.3
Cash and Cash Equivalents at Beginning of Period		$ 535.0		535.0	410.3
Cash and Cash Equivalents at End of Period	514.7		$ 413.6	514.7	$ 413.6
Amounts Excluding Effect of Adoption
Operating Activities
Net income	32.4			40.5
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17.7			35.4
Amortization of debt discount and deferred financing costs				4.4
Stock-based compensation				6.7
Retirement benefits, net				6.7
Insurance proceeds				(1.9)
Other, net				(0.1)
Changes in assets and liabilities:
Accounts receivable				(14.2)
Contract assets				(4.5)
Other current assets, net				16.7
Recoverable environmental remediation costs				5.3
Other noncurrent assets				(1.5)
Accounts payable				(9.7)
Contract liabilities				(77.6)
Other current liabilities				22.8
Deferred income taxes				(0.8)
Reserves for environmental remediation costs				(7.7)
Other noncurrent liabilities and other				4.0
Net Cash Provided by Operating Activities				24.5
Investing Activities
Purchases of marketable securities		(44.7)
Sales of marketable securities		20.1
Insurance proceeds				1.9
Capital expenditures				(12.2)
Net Cash Used in Investing Activities				(34.9)
Financing Activities
Debt repayments				(10.3)
Repurchase of shares for withholding taxes and option costs under employee equity plans				(2.1)
Proceeds from shares issued under equity plans				2.5
Net Cash Used in Financing Activities				(9.9)
Net (Decrease) Increase in Cash and Cash Equivalents				(20.3)
Cash and Cash Equivalents at Beginning of Period		535.0		535.0
Cash and Cash Equivalents at End of Period	514.7			514.7
Effect of Adoption | ASU 2014-09
Operating Activities
Net income	(2.4)			(8.3)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	0.0			0.0
Amortization of debt discount and deferred financing costs				0.0
Stock-based compensation				0.0
Retirement benefits, net				0.0
Insurance proceeds				0.0
Other, net				0.0
Changes in assets and liabilities:
Accounts receivable				26.5
Contract assets				3.0
Other current assets, net				0.4
Recoverable environmental remediation costs				0.0
Other noncurrent assets				0.0
Accounts payable				0.0
Contract liabilities				(19.5)
Other current liabilities				1.0
Deferred income taxes				(3.1)
Reserves for environmental remediation costs				0.0
Other noncurrent liabilities and other				0.0
Net Cash Provided by Operating Activities				0.0
Investing Activities
Purchases of marketable securities		0.0
Sales of marketable securities		0.0
Insurance proceeds				0.0
Capital expenditures				0.0
Net Cash Used in Investing Activities				0.0
Financing Activities
Debt repayments				0.0
Repurchase of shares for withholding taxes and option costs under employee equity plans				0.0
Proceeds from shares issued under equity plans				0.0
Net Cash Used in Financing Activities				0.0
Net (Decrease) Increase in Cash and Cash Equivalents				0.0
Cash and Cash Equivalents at Beginning of Period		$ 0.0		0.0
Cash and Cash Equivalents at End of Period	$ 0.0			$ 0.0

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Adoption of Revenue Recognition - Reclassification to December 31, 2017 Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 514.7	$ 535.0	$ 413.6	$ 410.3
Marketable securities	44.9	20.0
Accounts receivable	134.6	64.5
Inventories		0.0
Contract assets	253.1	268.1
Other current assets, net	123.2	129.1
Total Current Assets	1,070.5	1,016.7
Total Noncurrent Assets	1,339.6	1,242.0
Total Assets	2,410.1	2,258.7
Current Liabilities
Current portion of long-term debt	30.4	25.0
Accounts payable	104.1	100.9
Reserves for environmental remediation costs	34.6	35.2
Contract liabilities	185.3	276.8
Advance payments on contracts		0.0
Other current liabilities	313.0	156.9
Total Current Liabilities	667.4	594.8
Total Noncurrent Liabilities	1,522.6	1,561.5
Total Liabilities	2,190.0	2,156.3
Stockholders’ Equity
Total Stockholders’ Equity	220.1	102.4
Total Liabilities and Stockholders’ Equity	$ 2,410.1	2,258.7
As Reported
Current Assets
Cash and cash equivalents		535.0	413.6	410.3
Marketable securities		20.0
Accounts receivable		215.5
Inventories		136.4
Contract assets		0.0
Other current assets, net		109.8
Total Current Assets		1,016.7
Total Noncurrent Assets		1,242.0
Total Assets		2,258.7
Current Liabilities
Current portion of long-term debt		25.0
Accounts payable		100.9
Reserves for environmental remediation costs		35.2
Contract liabilities		0.0
Advance payments on contracts		237.8
Other current liabilities		195.9
Total Current Liabilities		594.8
Total Noncurrent Liabilities		1,561.5
Total Liabilities		2,156.3
Stockholders’ Equity
Total Stockholders’ Equity		102.4
Total Liabilities and Stockholders’ Equity		2,258.7
ASU 2014-09 | Reclassifications due to Adoption
Current Assets
Cash and cash equivalents		0.0	$ 0.0	$ 0.0
Marketable securities		0.0
Accounts receivable		(151.0)
Inventories		(136.4)
Contract assets		268.1
Other current assets, net		19.3
Total Current Assets		0.0
Total Noncurrent Assets		0.0
Total Assets		0.0
Current Liabilities
Current portion of long-term debt		0.0
Accounts payable		0.0
Reserves for environmental remediation costs		0.0
Contract liabilities		276.8
Advance payments on contracts		(237.8)
Other current liabilities		(39.0)
Total Current Liabilities		0.0
Total Noncurrent Liabilities		0.0
Total Liabilities		0.0
Stockholders’ Equity
Total Stockholders’ Equity		0.0
Total Liabilities and Stockholders’ Equity		$ 0.0

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Adoption of Revenue Recognition - Reclassification to Prior Period Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income	$ 34.8	$ 24.3	$ 48.8	$ 30.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17.7	19.1	35.4	35.4
Amortization of debt discount and deferred financing costs			4.4	4.2
Stock-based compensation	5.2	3.4	6.7	10.2
Retirement benefits, net			6.7	15.4
Other, net			(0.1)	0.3
Changes in assets and liabilities, net of effects from acquisition in 2017:
Accounts receivable			(40.7)	(50.3)
Inventories				0.0
Contract assets			(7.5)	(9.7)
Other current assets, net			16.3	12.2
Recoverable environmental remediation costs			5.3	10.1
Other noncurrent assets			(1.5)	(31.5)
Accounts payable			(9.7)	12.6
Contract liabilities			(58.1)	(43.0)
Advance payments on contracts				0.0
Other current liabilities			21.8	13.6
Deferred income taxes			2.3	15.9
Reserves for environmental remediation costs			(7.7)	(10.8)
Other noncurrent liabilities and other			4.0	22.9
Net Cash Provided by Operating Activities			24.5	37.7
Investing Activities
Net Cash Used in Investing Activities			(34.9)	(21.1)
Financing Activities
Net Cash Used in Financing Activities			(9.9)	(13.3)
Net (Decrease) Increase in Cash and Cash Equivalents			(20.3)	3.3
Cash and Cash Equivalents at Beginning of Period			535.0	410.3
Cash and Cash Equivalents at End of Period	$ 514.7	413.6	514.7	413.6
As Reported
Operating Activities
Net income				30.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization				35.4
Amortization of debt discount and deferred financing costs				4.2
Stock-based compensation				10.2
Retirement benefits, net				15.4
Other, net				0.3
Changes in assets and liabilities, net of effects from acquisition in 2017:
Accounts receivable				(87.8)
Inventories				20.7
Contract assets				0.0
Other current assets, net				19.3
Recoverable environmental remediation costs				10.1
Other noncurrent assets				(31.5)
Accounts payable				12.6
Contract liabilities				0.0
Advance payments on contracts				(49.0)
Other current liabilities				19.6
Deferred income taxes				15.9
Reserves for environmental remediation costs				(10.8)
Other noncurrent liabilities and other				22.9
Net Cash Provided by Operating Activities				37.7
Investing Activities
Net Cash Used in Investing Activities				(21.1)
Financing Activities
Net Cash Used in Financing Activities				(13.3)
Net (Decrease) Increase in Cash and Cash Equivalents				3.3
Cash and Cash Equivalents at Beginning of Period			535.0	410.3
Cash and Cash Equivalents at End of Period		413.6		413.6
ASU 2014-09 | Reclassifications due to Adoption
Operating Activities
Net income				0.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization				0.0
Amortization of debt discount and deferred financing costs				0.0
Stock-based compensation				0.0
Retirement benefits, net				0.0
Other, net				0.0
Changes in assets and liabilities, net of effects from acquisition in 2017:
Accounts receivable				37.5
Inventories				(20.7)
Contract assets				(9.7)
Other current assets, net				(7.1)
Recoverable environmental remediation costs				0.0
Other noncurrent assets				0.0
Accounts payable				0.0
Contract liabilities				(43.0)
Advance payments on contracts				49.0
Other current liabilities				(6.0)
Deferred income taxes				0.0
Reserves for environmental remediation costs				0.0
Other noncurrent liabilities and other				0.0
Net Cash Provided by Operating Activities				0.0
Investing Activities
Net Cash Used in Investing Activities				0.0
Financing Activities
Net Cash Used in Financing Activities				0.0
Net (Decrease) Increase in Cash and Cash Equivalents				0.0
Cash and Cash Equivalents at Beginning of Period			$ 0.0	0.0
Cash and Cash Equivalents at End of Period		$ 0.0		$ 0.0