10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

Form 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 27, 2018

Or

o 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 001-33160

Spirit AeroSystems Holdings, Inc.

(Exact name of registrant as specified in its charter)

Delaware	20-2436320
(State or other jurisdiction of  incorporation or organization)	(I.R.S. Employer Identification No.)

3801 South Oliver

Wichita, Kansas 67210

(Address of principal executive offices and zip code)

Registrant’s telephone number, including area code:

(316) 526-9000

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 x  No o

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 (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes x  No o

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

Large accelerated filer x Accelerated filer o Non-accelerated filer o Smaller reporting company o Emerging Growth Company o

If an emerging growth company, indicate by check mark whether 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 Exchange Act.  o

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

As of October 24, 2018, the registrant had 105,997,678 shares of class A common stock, $0.01 par value per share, outstanding.

1

TABLE OF CONTENTS

	PART I — FINANCIAL INFORMATION
		Page
Item 1.	Financial Statements (unaudited)	3
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	40
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	52
Item 4.	Controls and Procedures	52
PART II — OTHER INFORMATION
Item 1.	Legal Proceedings	53
Item 1A.	Risk Factors	53
Item 6.	Exhibits	54
Signatures		55

2

PART 1. FINANCIAL INFORMATION

Item 1. Financial Statements (unaudited)

Spirit AeroSystems Holdings, Inc.

Condensed Consolidated Statements of Operations

(unaudited)

	For the Three  Months Ended						For the Nine   Months Ended
	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
	($ in millions, except per share data)
Revenue	$	1,813.7		$	1,748.2		$	5,386.7		$	5,268.4
Operating costs and expenses
Cost of sales	1,543.1			1,486.6			4,601.3			4,762.8
Selling, general and administrative	37.3			49.8			154.5			149.9
Impact of severe weather event	—			—			—			19.9
Research and development	10.8			9.5			31.3			21.2
Total operating costs and expenses	1,591.2			1,545.9			4,787.1			4,953.8
Operating income	222.5			202.3			599.6			314.6
Interest expense and financing fee amortization	(24.2		)	(10.4		)	(60.3		)	(30.1		)
Other income (expense), net	7.4			11.0			(0.8		)	32.2
Income before income taxes and equity in net income of affiliate	205.7			202.9			538.5			316.7
Income tax provision	(36.9		)	(55.9		)	(99.7		)	(84.9		)
Income before equity in net income of affiliate	168.8			147.0			438.8			231.8
Equity in net income of affiliate	—			0.2			0.6			0.3
Net income	$	168.8		$	147.2		$	439.4		$	232.1
Earnings per share
Basic	$	1.61		$	1.27		$	4.02		$	1.97
Diluted	$	1.59		$	1.26		$	3.98		$	1.95
Dividends declared per common share	$	0.12		$	0.10		$	0.34		$	0.30

See notes to condensed consolidated financial statements (unaudited)

3

Spirit AeroSystems Holdings, Inc.

Condensed Consolidated Statements of Comprehensive Income

(unaudited)

	For the Three Months Ended						For the Nine   Months Ended
	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
	($ in millions)
Net income	$	168.8		$	147.2		$	439.4		$	232.1
Changes in other comprehensive income, net of tax:
Pension, SERP, and Retiree medical adjustments, net of tax effect of $0.1 and $0.2 for the three months ended, respectively, and $0.5 and $1.2 for the nine months ended, respectively	(0.6		)	(0.6		)	(1.8		)	(1.5		)
Unrealized foreign exchange loss on intercompany loan, net of tax effect of zero and ($0.4) for three months ended, respectively, and $0.3 and ($1.0) for the nine months ended, respectively	—			1.3			(1.3		)	3.9
Foreign currency translation adjustments	—			13.1			(13.4		)	31.2
Total other comprehensive (loss) income	(0.6		)	13.8			(16.5		)	33.6
Total comprehensive income	$	168.2		$	161.0		$	422.9		$	265.7

See notes to condensed consolidated financial statements (unaudited)

4

Spirit AeroSystems Holdings, Inc.

Condensed Consolidated Balance Sheets

(unaudited)

	September 27, 2018			December 31, 2017
	($ in millions)
Assets
Cash and cash equivalents	$	683.4		$	423.3
Restricted cash	0.3			2.2
Accounts receivable, net	685.1			722.2
Contract assets, short-term	513.2			—
Inventory, net	931.0			1,449.9
Other current assets	35.4			53.5
Total current assets	2,848.4			2,651.1
Property, plant and equipment, net	2,123.0			2,105.3
Contract assets, long-term	53.5			—
Pension assets	372.3			347.1
Other assets	284.9			164.3
Total assets	$	5,682.1		$	5,267.8
Liabilities
Accounts payable	$	882.4		$	693.1
Accrued expenses	354.0			269.3
Profit sharing	42.0			109.5
Current portion of long-term debt	25.0			31.1
Advance payments, short-term	112.7			100.0
Contract liabilities, short-term	153.5			—
Forward loss provision, short-term	147.3			—
Deferred revenue and other deferred credits, short-term	7.1			64.6
Deferred grant income liability - current	19.4			21.6
Other current liabilities	68.8			331.8
Total current liabilities	1,812.2			1,621.0
Long-term debt	1,869.7			1,119.9
Advance payments, long-term	146.4			231.7
Pension/OPEB obligation	38.4			40.8
Contract liabilities, long-term	353.8			—
Forward loss provision, long-term	72.6			—
Deferred revenue and other deferred credits	26.8			161.0
Deferred grant income liability - non-current	30.7			39.3
Other liabilities	215.1			252.6
Stockholders' Equity
Preferred stock, par value $0.01, 10,000,000 shares authorized, no shares issued	—			—
Common stock, Class A par value $0.01, 200,000,000 shares authorized, 106,493,926 and 114,447,605 shares issued and outstanding, respectively	1.1			1.1
Additional paid-in capital	983.4			1,086.9
Accumulated other comprehensive loss	(145.0		)	(128.5		)
Retained earnings	2,548.7			2,422.4
Treasury stock, at cost (39,624,996 and 31,467,709 shares, respectively)	(2,272.3		)	(1,580.9		)
Total stockholders’ equity	1,115.9			1,801.0
Noncontrolling interest	0.5			0.5
Total equity	1,116.4			1,801.5
Total liabilities and equity	$	5,682.1		$	5,267.8

 See notes to condensed consolidated financial statements (unaudited)

5

Spirit AeroSystems Holdings, Inc.

Condensed Consolidated Statements of Cash Flows

(unaudited)

	For the Nine Months Ended
	September 27, 2018			September 28, 2017
	($ in millions)
Operating activities
Net income	$	439.4		$	232.1
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation expense	171.3			159.0
Amortization expense	0.4			0.2
Amortization of deferred financing fees	17.3			2.5
Accretion of customer supply agreement	3.0			1.5
Employee stock compensation expense	19.9			15.9
Loss from derivative instruments	3.4			1.1
Loss (gain) from foreign currency transactions	0.8			(5.9		)
Loss on impairment and disposition of assets	1.7			7.9
Deferred taxes	(37.8		)	29.0
Pension and other post-retirement benefits, net	(25.1		)	(32.5		)
Grant liability amortization	(15.9		)	(13.9		)
Equity in net income of affiliate	(0.6		)	(0.3		)
Forward loss provision	(134.0		)	—
Changes in assets and liabilities
Accounts receivable	(122.3		)	(177.8		)
Contract assets	(50.4		)	—
Inventory, net	26.7			433.9
Accounts payable and accrued liabilities	279.9			212.8
Profit sharing/deferred compensation	(67.4		)	(35.9		)
Advance payments	(73.2		)	(154.7		)
Income taxes receivable/payable	(28.3		)	(36.0		)
Contract liabilities	188.0			—
Deferred revenue and other deferred credits	(1.1		)	(222.8		)
Other	(28.3		)	208.5
Net cash provided by operating activities	567.4			624.6
Investing activities
Purchase of property, plant and equipment	(170.9		)	(138.7		)
Other	2.8			0.4
Net cash used in investing activities	(168.1		)	(138.3		)
Financing activities
Proceeds from the issuance of bonds	1,300.0			—
Principal payments of debt	(4.9		)	(2.3		)
Payments on term loan	(256.3		)	(12.5		)
Payments on bonds	(300.0		)	—
Taxes paid related to net share settlement awards	(15.5		)	(13.8		)
Debt issuance and financing costs	(23.2		)	(0.9		)
Proceeds from financing under the New Markets Tax Credit Program	—			7.6
Purchase of treasury stock	(805.8		)	(402.1		)
Dividends Paid	(35.4		)	(35.7		)
Net cash used in financing activities	(141.1		)	(459.7		)
Effect of exchange rate changes on cash and cash equivalents	0.2			5.6
Net increase in cash, cash equivalents, and restricted cash for the period	258.4			32.2
Cash, cash equivalents, and restricted cash, beginning of period	445.5			717.6
Cash, cash equivalents, and restricted cash, end of period	$	703.9		$	749.8

See notes to condensed consolidated financial statements (unaudited)

6

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

1.  Organization and Basis of Interim Presentation

Spirit AeroSystems Holdings, Inc. (“Holdings” or the “Company”) provides manufacturing and design expertise in a wide range of fuselage, propulsion, and wing products and services for aircraft original equipment manufacturers (“OEM”) and operators through its subsidiary, Spirit AeroSystems, Inc. (“Spirit”). The Company's headquarters are in Wichita, Kansas, with manufacturing and assembly facilities in Tulsa and McAlester, Oklahoma; Prestwick, Scotland; Wichita, Kansas; Kinston, North Carolina; Subang, Malaysia; and Saint-Nazaire, France.

The accompanying unaudited interim condensed consolidated financial statements include the Company’s financial statements and the financial statements of its majority-owned or controlled subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and the instructions to Form 10-Q and Article 10 of Regulation S-X.  The Company’s fiscal quarters are 13 weeks in length. Since the Company’s fiscal year ends on December 31, the number of days in the Company’s first and fourth quarters varies slightly from year to year. All intercompany balances and transactions have been eliminated in consolidation.

As part of the monthly consolidation process, the Company’s international entities that have functional currencies other than the U.S. dollar are translated to U.S. dollars using the end-of-month translation rate for balance sheet accounts and average period currency translation rates for revenue and income accounts. The U.K. and Malaysian subsidiaries use the British pound as their functional currency. All other foreign subsidiaries and branches use the U.S. dollar as their functional currency.

In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all adjustments (consisting of normal recurring adjustments and elimination of intercompany balances and transactions) considered necessary to fairly present the results of operations for the interim period. The results of operations for the nine months ended September 27, 2018, are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. Certain reclassifications have been made to the prior year financial statements and notes to conform to the 2018 presentation.

In connection with the preparation of the condensed consolidated financial statements, the Company evaluated subsequent events through the date the financial statements were issued. The interim financial statements should be read in conjunction with the audited consolidated financial statements, including the notes thereto, included in the Company’s 2017 Annual Report on Form 10-K filed with the Securities and Exchange Commission (the “SEC”) on February 9, 2018 (the “2017 Form 10-K”).

2.  Adoption of New Accounting Standards

Adoption of New Revenue Standard

In May 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”) that supersedes ASC 605-35, Revenue Recognition - Construction-Type and Production-Type Contracts (“legacy GAAP”). Subsequently, the FASB issued several updates to ASU 2014-09, which are pending content or otherwise codified in Accounting Standards Codification (“ASC”) Topic 606 (“ASC 606”). ASC 606 also includes new guidance on costs related to a contract, which is codified in ASC Subtopic 340-40 (“ASC 340-40”). The Company adopted ASC 606 using the modified retrospective method (“method”) effective as of January 1, 2018 (“date of initial application”). Under this method, the cumulative effect of the adoption of ASC 606 is recognized as an adjustment to retained earnings on the date of initial application (“Transition Adjustment”), and the comparative financial statements for prior periods are not adjusted and continue to be reported under legacy GAAP. The Transition Adjustment was an after tax decrease to retained earnings of approximately $277.0. Financial information for 2018 and 2017 is presented under ASC 606 and under legacy GAAP, respectively. The tables below reflect adjusted 2018 financial statement amounts as if the Company had been reporting under legacy GAAP for items that are materially different.

The adoption of ASC 606 does not impact the Company's cash flows or the underlying economics of the Company's contracts with customers. However, the pattern and timing of revenue and profit recognition, as well as financial statement presentation and disclosures, has changed.

The significant changes and the qualitative and quantitative impact of the adoption of ASC 606 are noted below:

a.Revenue from Contracts with Customers

7

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

The Company no longer uses the units-of-delivery method, and the historical use of contract blocks to define contracts for accounting purposes has been replaced by accounting contracts as identified under ASC 606. The Company's accounting contracts under ASC 606 are for the specific number of units for which orders have been received, which is typically for fewer units than what was used to define contract blocks under legacy GAAP. In most of the Company's contracts, the customer has options or requirements to purchase additional products and services.

b.Deferred Production Costs

Under legacy GAAP, certain production costs were deferred over the life of the contract block, which is not permitted under ASC 606. Accordingly, deferred production costs of $640.3 (pretax), net of previously recognized forward loss reserves of $364.0 (pretax), were eliminated, resulting in a decrease to retained earnings in the Transition Adjustment.

c.Contract Assets and Contract Liabilities

Contract assets primarily represent revenues recognized for performance obligations that have been satisfied but for which amounts have not been billed. Contract assets in the amount of $342.0 were established in the Transition Adjustment.

Contract liabilities primarily represent cash received that is in excess of revenues recognized and is contingent upon the satisfaction of performance obligations. For certain contracts, the allocation of consideration to the performance obligations results in a deferral of revenue that was previously recognized under legacy GAAP. Contract liabilities in the amount of $113.0 were established in the Transition Adjustment, which reflects consideration received prior to the date of initial application that is in excess of the standalone selling price. This liability includes an allocation of consideration to future units, including those under options that the Company believes are likely to be exercised, with prices that are lower than standalone selling price. This liability will be recognized earlier if the options are not fully exercised, or immediately if the contract is terminated prior to the options being fully exercised.

d.Contract Costs

The Company’s accounting for preproduction, tooling, and certain other costs has not changed since these costs generally do not fall within the scope of ASC 340-40. Incurred production costs for anticipated contracts (satisfaction of performance obligations, which have commenced because the Company expects the customer to exercise options) continue to be classified as inventory.

e.     Practical expedients

The Company has adopted ASC 606 only for contracts that were not substantially completed under legacy GAAP on the date of initial application. For these contracts, the Company has reflected the aggregate effect of all modifications executed prior to the date of initial application when identifying satisfied and unsatisfied performance obligations, for determining the transaction price and for allocating the transaction price.

The following tables summarize the impacts of adopting ASC Topic 606 on the Company’s consolidated financial statements for the three and nine month periods ended September 27, 2018.

8

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

	For the Three  Months Ended									For the Nine  Months Ended
	As Reported			Impact of Adoption of			As Adjusted			As Reported			Impact of Adoption of			As Adjusted
	September 27, 2018			ASC Topic 606			September 27, 2018			September 27, 2018			ASC Topic 606			September 27, 2018
Revenue	$	1,813.7		$	15.9		$	1,829.6		$	5,386.7		$	106.6		$	5,493.3
Cost of sales	1,543.1			68.2			1,611.3			4,601.3			207.7			4,809.0
Income tax provision	(36.9		)	10.6			(26.3		)	(99.7		)	20.9			(78.8		)
Net income	168.8			(41.7		)	127.1			439.4			(80.2		)	359.2
Earnings per share
Basic	$	1.61		$	(0.40	)	$	1.21		$	4.02		$	(0.73	)	$	3.29
Diluted	$	1.59		$	(0.39	)	$	1.20		$	3.98		$	(0.72	)	$	3.26

	As Reported			Impact of Adoption of			As Adjusted
	September 27, 2018			ASC Topic 606			September 27, 2018
Assets
Accounts receivable, net	$	685.1		$	131.0		$	816.1
Contract assets, short-term	513.2			(513.2		)	—
Inventory, net	931.0			445.2			1,376.2
Other current assets	35.4			36.1			71.5
Contract assets, long-term	53.5			(53.5		)	—
Other assets	284.9			(78.5		)	206.4
Total assets	5,682.1			(32.9		)	5,649.2
Liabilities
Accrued expenses	354.0			(7.1		)	346.9
Contract liabilities, short-term	153.5			(153.5		)	—
Forward loss provision, short-term	147.3			(147.3		)	—
Deferred revenue and other deferred credits, short-term	7.1			144.9			152.0
Other current liabilities	68.8			290.8			359.6
Contract liabilities, long-term	353.8			(353.8		)	—
Forward loss provision, long-term	72.6			(72.6		)	—
Deferred revenue and other deferred credits	26.8			71.5			98.3
Stockholders' Equity
Accumulated other comprehensive loss	(145.0		)	(2.2		)	(147.2		)
Retained earnings	2,548.7			196.4			2,745.1
Total liabilities and equity	5,682.1			(32.9		)	5,649.2

Adoption of ASU 2017-07

In March 2017, the FASB issued ASU No. 2017-07, Compensation-Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (“ASU 2017-07”). ASU 2017-07 requires entities to report the service cost component of net periodic pension and net periodic postretirement benefit cost in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. Further, ASU 2017-07 requires the other components of net periodic pension and net periodic postretirement benefit cost to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is

9

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

presented. Additionally, only the service cost component is eligible for capitalization, when applicable. The Company adopted the requirements of ASU 2017-07 on January 1, 2018, using the retrospective transition method.

Prior period information has been reclassified as a result of the Company's adoption of ASU 2017-07 on a retrospective basis in 2018. In accordance with the adoption of this guidance, prior year amounts related to the components of net periodic pension and postretirement benefit cost other than service costs have been reclassified from cost of sale and selling, general and administrative expense to other income (expense) within the consolidated statement of operations for all periods presented. The reclassifications are as follows:

	For the Three Months Ended						For the Nine Months Ended
	As Reported		Impact of Adoption of		As Adjusted		As Reported		Impact of Adoption of		As Adjusted
	September 28, 2017		ASU 2017-07		September 28, 2017		September 28, 2017		ASU 2017-07		September 28, 2017
Cost of sales	$	1,478.5	$	8.1	$	1,486.6	$	4,738.3	$	24.5	$	4,762.8
Selling, general and administrative	48.8		1.0		49.8		146.8		3.1		149.9
Other income, net	1.9		9.1		11.0		4.6		27.6		32.2

Adoption of ASU 2016-18

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB Emerging Issues Task Force) (“ASU 2016-18”), which addresses classification and presentation of changes in restricted cash on the statement of cash flows. The standard requires a reconciliation of the beginning-of-period and end-of-period total amounts shown on the statement of cash flows to include in cash and cash equivalents amounts generally described as restricted cash and restricted cash equivalents. The ASU does not define restricted cash or restricted cash equivalents, but an entity will need to disclose the nature of the restrictions. The Company adopted ASU 2016-18 on January 1, 2018. Below is a reconciliation of cash, cash equivalents, and restricted cash. Long-term restricted cash is included in Other Assets on the Company's condensed consolidated balance sheet.

Reconciliation of Cash, Cash Equivalents, and Restricted Cash:
	For the Nine Months Ended
	September 27, 2018		September 28, 2017
Cash and cash equivalents, beginning of the period	$	423.3	$	697.7
Restricted cash, short-term, beginning of the period	2.2		—
Restricted cash, long-term, beginning of the period	20.0		19.9
Cash, cash equivalents, and restricted cash, beginning of the period	$	445.5	$	717.6
Cash and cash equivalents, end of the period	$	683.4	$	726.6
Restricted cash, short-term, end of the period	0.3		3.2
Restricted cash, long-term, end of the period	20.2		20.0
Cash, cash equivalents, and restricted cash, end of the period	$	703.9	$	749.8

3. Summary of Significant Accounting Policies

Use of Estimates

The preparation of the Company's financial statements in conformity with GAAP requires management to use estimates and assumptions. The results of these estimates form the basis for making judgments that may affect the reported amounts of assets and liabilities, including the impacts of contingent assets and liabilities, and the reported amounts of revenue and expenses during the reporting period.

10

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Management may make significant judgments when assessing estimated amounts of variable consideration and related constraints, the number of options likely to be exercised, and the standalone selling prices of the Company’s products and services. The Company also estimates the cost of satisfying the performance obligations in its contracts and options that may extend over many years. Cost estimates reflect currently available information and the impact of any changes to cost estimates, based upon the facts and circumstances, are recorded in the period in which they become known.

The transaction price for a contract reflects the consideration the Company expects to receive for fully satisfying the performance obligations in the contract. The Company’s contracts with customers are typically for products and services to be provided at fixed stated prices but may also include variable consideration. Variable consideration may include, but is not limited to, unpriced contract modifications, cost sharing provisions, incentives and awards, non-warranty claims and assertions, provisions for non-conformance and rights to return, or other payments to, or receipts from, customers and suppliers. The Company estimates the variable consideration using the expected value or the most likely amount based upon the facts and circumstances, available data and trends and the history of resolving variability with specific customers and suppliers.

The Company regularly commences work and incorporates customer-directed changes prior to negotiating pricing terms for engineering work, product modifications, and other statements of work. The Company's contractual terms typically provide for price negotiations after certain customer-directed changes have been accepted by the Company. Prices are estimated until they are contractually agreed upon with the customer. When a contract is modified, the Company evaluates whether additional distinct products and services have been promised and whether allocation of consideration is necessary. If not, the modification is treated as a change to the performance obligations within the existing contract, or otherwise accounted for as a new contract prospectively.

The Company allocates the consideration for a contract to the performance obligations on the basis of their relative standalone selling price. The Company estimates the likelihood of the amount of options that the customer is going to exercise when assessing the existence of performance obligations with respect to this allocation or for assessing the impact of loss contracts.

The Company typically provides warranties on all the Company's products and services. Generally, warranties are not priced separately because customers cannot purchase them independently of the products or services under contract so they do not create performance obligations. Spirit warranties generally provide assurance to the Company's customers that the products or services meet the specifications in the contract. In the event that there is a warranty claim because of a covered design, material or workmanship issue, the Company may be required to redesign or modify the product, offer concessions, and/or pay the customer for repairs or perform the repair. Provisions for estimated expenses related to design, service, and product warranties and certain extraordinary rework are made at the time products are sold. These costs are accrued at the time of the sale and are recorded as unallocated cost of sales. These estimates are established using historical information on the nature, frequency, and the cost experience of warranty claims, including the experience of industry peers. In the case of new development products or new customers, Spirit also considers factors including the warranty experience of other entities in the same business, management judgment, and the type and nature of the new product or new customer, among others.

Actual results could differ from those estimates and assumptions.

Revenues and Profit Recognition

Substantially all of the Company’s revenues are from long-term supply agreements with Boeing, Airbus, and other aerospace manufacturers. The Company participates in its customers’ programs by providing design, development, manufacturing, fabrication, and support services for major aerostructures in the fuselage, propulsion, and wing segments. During the early stages of a program, this frequently involves nonrecurring design and development services, including tooling. As the program matures, the Company provides recurring manufacturing of products in accordance with customer design and schedule requirements. Many contracts include clauses that provide sole supplier status to the Company for the duration of the program’s life (including derivatives). The Company's long-term supply agreements typically include fixed price volume-based terms and require the satisfaction of performance obligations for the duration of the program’s life.

The identification of an accounting contract with a customer and the related promises require an assessment of each party’s rights and obligations regarding the products or services to be transferred, including an evaluation of termination clauses and presently enforceable rights and obligations. In general, these long-term supply agreements are legally governed by Master Supply Agreements (or General Terms and Agreements) together with special business provisions (or work package agreements), which define specific program requirements. Purchase orders (or authorizations to proceed) are issued under these agreements to reflect presently enforceable rights and obligations for the units of products and services being purchased. The units for accounting

11

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

purposes (“accounting contract”) is typically determined by the purchase orders. Revenue is recognized when the Company has a contract with presently enforceable rights and obligations, including an enforceable right to payment for work performed. These agreements may lead to continuing sales of more than twenty years. Customers generally contract with the Company for requirements in a segment relating to a specific program, and the Company’s performance obligations consist of a wide range of engineering design services and manufactured structural components, as well as spare parts and repairs for OEMs. A single program may result in multiple contracts for accounting purposes, and within the respective contracts, non-recurring work elements and recurring work elements may result in multiple performance obligations. The Company generally contracts directly with its customers and is the principal in all current contracts.

Management considers a number of factors when determining the existence of a contract and the related performance obligations that include, but are not limited to, the nature and substance of the business exchange, the contractual terms and conditions, the promised products and services, the termination provisions in the contract, including the presently enforceable rights and obligations of the parties to the contract, the nature and execution of the customer’s ordering process and how the Company is authorized to perform work, whether the promised products and services are distinct or capable of being distinct within the context of the contract, as well as how and when products and services are transferred to the customer.

Revenue is recognized when, or as, control of promised products or services transfers to a customer and is recognized in an amount that reflects the consideration that the Company expects to receive in exchange for those products or services. Revenue is recognized over time as work progresses when the Company is entitled to the reimbursement of costs plus a reasonable profit for work performed for which the Company has no alternate use. For these performance obligations that are satisfied over time, the Company generally recognizes revenue using an input method with revenue amounts being recognized proportionately as costs are incurred relative to the total expected costs to satisfy the performance obligation. The Company believes that costs incurred as a portion of total estimated costs is an appropriate measure of progress towards satisfaction of the performance obligation since this measure reasonably depicts the progress of the work effort.

Revenue for performance obligations that are not recognized over time are recognized at the point in time when control transfers to the customer (which is generally upon delivery). For performance obligations that are satisfied at a point in time, the Company evaluates the point in time when the customer can direct the use of, and obtain the benefits from, the products and services. Shipping and handling costs are not considered performance obligations and are included in cost of sales as incurred.

The transaction price for a contract reflects the consideration the Company expects to receive for fully satisfying the performance obligations in the contract. The Company’s current contracts do not include any significant financing components because the timing of the transfer of the underlying products and services under contract are at the customers’ discretion. The Company's contracts with customers generally require payment under normal commercial terms after delivery. Payment terms are typically within 30 to 120 days of delivery. The total transaction price is allocated to each of the identified performance obligations using the relative standalone selling price to reflect the amount the Company expects to be entitled for transferring the promised products and services to the customer. A majority of the Company’s agreements with customers include options for future purchases. For the purposes of allocating transaction price, the Company assesses, based upon the facts and circumstances of the business arrangement, the amount and likelihood of options to be exercised that may result in deferral of revenue to future contracts and options. Deferred revenues are recognized as, or when, the underlying future performance obligations are satisfied.

Standalone selling price is the price at which the Company would sell a promised good or service separately to a customer. Standalone selling prices are established at contract inception and subsequent changes in transaction price are allocated on the same basis as at contract inception. Standalone selling prices for the Company’s products and services are generally not observable and the Company uses the “Expected Cost plus a Margin” approach to determine standalone selling price. Expected costs are typically derived from the available periodic forecast information. If a contract modification changes the overall transaction price of an existing contract, the Company allocates the new transaction price on the basis of the relative standalone selling prices of the performance obligations and cumulative adjustments, if any, are recorded in the current period.

The Company also identifies and estimates variable consideration for contractual provisions such as unpriced contract modifications, cost sharing provisions, incentives and awards, non-warranty claims and assertions, provisions for non-conformance and rights to return, or other payments to, or receipts from, customers and suppliers. The timing of satisfaction of performance obligations and actual receipt of payment from a customer may differ and affects the balances of the contract assets and liabilities.

For contracts that are deemed to be loss contracts, the Company establishes forward loss reserves for total estimated costs that are in excess of total estimated consideration in the period in which they become known. These reserves are based on estimates

12

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

for accounting contracts, plus options that the Company believes are likely to be exercised. The Company records forward loss reserves for all performance obligations in the aggregate for the accounting contract.

Disaggregation of Revenue

The Company disaggregates revenue based on the method of measuring satisfaction of the performance obligation either over time or at a point in time, and determining whether the accounting contract is a short duration or long duration contract. Short duration contracts are those for which the performance obligations are expected to be fully satisfied within 12 months of contract origination. The number of units and the production schedule is used to make this assessment. Additionally, the Company disaggregates revenue based upon the location where products and services are transferred to the customer. The Company’s principal operating segments and related revenue are noted in Note 22, Segment Information.

The following table disaggregates revenues by the method of performance obligation satisfaction:

	For the Three Months Ended		For the Nine Months Ended
Revenue	September 27, 2018		September 27, 2018
Contracts with performance obligations satisfied over time	$	1,456.7	$	4,212.6
Contracts with performance obligations satisfied at a point in time	357.0		1,174.1
Total Revenue	$	1,813.7	$	5,386.7

The following table disaggregates revenue by major customer:

	For the Three Months Ended		For the Nine Months Ended
Customer	September 27, 2018		September 27, 2018
Boeing	$	1,465.5	$	4,262.2
Airbus	263.8		869.0
Other	84.4		255.5
Total Revenue	$	1,813.7	$	5,386.7

The following table disaggregates revenue based upon the location where control of products are transferred to the customer:

	For the Three Months Ended		For the Nine Months Ended
Location	September 27, 2018		September 27, 2018
United States	$	1,534.0	$	4,460.8
International
United Kingdom	184.4		574.1
Other	95.3		351.8
Total International	279.7		925.9
Total Revenue	$	1,813.7	$	5,386.7

Inventory

13

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Raw materials are stated at lower of cost (principally on an actual or average cost basis) or market. Production costs for contracts, including costs expected to be recovered on specific anticipated contracts (satisfaction of performance obligations that have commenced because the Company expects the customer to exercise options), are classified as work-in-process and include direct material, labor, overhead, and purchases. Revenue and related cost of sales are recognized as the performance obligations are satisfied. Typically, anticipated contracts materialize and the related performance obligations are satisfied within 6-12 months. These costs are evaluated for impairment periodically and capitalized costs for which anticipated contracts do not materialize are written off in the period in which it becomes known. Work-in-process includes $152.9 in costs incurred in anticipation of specific future contracts and no impairments were charged for the period ending September 27, 2018. See Note 9, Inventory.

4.  New Accounting Pronouncements

In August 2018, the FASB issued ASU No. 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Topic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans (“ASU 2018-14”), which modifies the disclosure requirements for defined benefit pension plans and other postretirement plans. ASU 2018-14 is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework — Changes to the Disclosure Requirements for Fair Value Measurement” (“ASU 2018-13”), which modifies the disclosure requirements on fair value measurements by removing, modifying, or adding certain disclosures. Certain disclosures in ASU 2018-13 are required to be applied on a retrospective basis and others on a prospective basis. ASU 2018-13 is effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220)(“ASU 2018-02”). The guidance in ASU 2018-02 allows an entity to elect to reclassify the stranded tax effects related to the Tax Cuts and Jobs Act of 2017 (the “TCJA”) from accumulated other comprehensive income into retained earnings. ASU 2018-02 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company does not expect the adoption of this standard to have a material effect to the Company’s consolidated financial statements.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”), which expands component and fair value hedging, specifies the presentation of the effects of hedging instruments, and eliminates the separate measurement and presentation of hedge ineffectiveness. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 as of January 1, 2018. The adoption of ASU 2017-12 did not have a material impact to the Company’s consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”). This update requires recognition of lease assets and lease liabilities on the balance sheet of lessees. ASU 2016-02 is effective for fiscal years and interim reporting periods within those years beginning after December 15, 2018. Early adoption is permitted. ASU 2016-02 requires a modified retrospective transition approach and provides certain optional transition relief. The Company is progressing through its implementation plan and continue to evaluate the impact of the standard on its business processes, accounting systems, controls and financial statement disclosures, however the Company does not expect the adoption of this standard to have a material effect to the Company’s consolidated financial statements.

5.  Changes in Estimates

The Company has a periodic forecasting process in which management assesses the progress and performance of the Company’s programs. This process requires management to review each program’s progress by evaluating the program schedule, changes to identified risks and opportunities, changes to estimated revenues and costs for the accounting contracts (and options if applicable), and any outstanding contract matters. Risks and opportunities include but are not limited to management’s judgment about the cost associated with the Company’s ability to achieve the schedule, technical requirements (e.g., a newly-developed product versus a mature product), and any other program requirements. Due to the span of years it may take to completely satisfy the performance obligations for the accounting contracts (and options, if any) and the scope and nature of the work required to be performed on those contracts, the estimation of total revenue and costs is subject to many variables and, accordingly, is subject to change based upon judgment. When adjustments in estimated total consideration or estimated total cost are required, any changes from prior

14

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

estimates for fully satisfied performance obligations are recognized in the current period as a cumulative catch-up adjustment for the inception-to-date effect of such changes. Cumulative catch-up adjustments are driven by several factors including production efficiencies, assumed rate of production, the rate of overhead absorption, changes to scope of work, and contract modifications. For 2017, the changes in estimates apply to contract blocks under legacy GAAP under the units of delivery method. For 2018, cumulative catch-up adjustments are primarily related to changes in measure of progress for contracts with performance obligations that are satisfied over time. For 2018, forward losses recorded relate primarily to the impact of the adoption of ASU 2017-07 related to pension, offset by favorable performance on cost initiatives.

Changes in estimates are summarized below:

	For the Three Months Ended						For the Nine Months Ended
Changes in Estimates	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
(Unfavorable) Favorable Cumulative Catch-up Adjustment by Segment
Fuselage Systems	$	(12.0	)	$	(2.4	)	$	(3.0	)	$	5.3
Propulsion Systems	(2.4		)	2.4			0.9			4.3
Wing Systems	1.4			(2.8		)	0.9			19.1
Total (Unfavorable) Favorable Cumulative Catch-up Adjustment	$	(13.0	)	$	(2.8	)	$	(1.2	)	$	28.7
(Forward Loss) Changes in Estimate on Loss Programs by Segment
Fuselage Systems	$	—		$	(0.9	)	$	(1.5	)	$	(238.5	)
Propulsion Systems	(0.8		)	1.3			—			(46.7		)
Wing Systems	0.3			(2.4		)	(0.2		)	(74.4		)
Total Forward Loss	$	(0.5	)	$	(2.0	)	$	(1.7	)	$	(359.6	)
Total Change in Estimate	$	(13.5	)	$	(4.8	)	$	(2.9	)	$	(330.9	)
EPS Impact (diluted per share based upon statutory rates)	$	(0.10	)	$	(0.03	)	$	(0.02	)	$	(1.75	)

6.  Accounts Receivable, net

Accounts receivable represent the Company’s unconditional rights to consideration, subject to the payment terms of the contract, for which only the passage of time is required before payment. For balances as of September 27, 2018, amounts that are receivable or payable that are contingent upon, or related to, satisfied or to be satisfied performance obligations, are presented as contract assets or liabilities. The Company determines an allowance for doubtful accounts based on a review of outstanding receivables that are charged off against the allowance after the potential for recovery is considered remote.

Accounts receivable, net consists of the following:

	September 27, 2018			December 31, 2017
Trade receivables	$	660.0		$	710.5
Other	25.7			13.0
Less: allowance for doubtful accounts	(0.6		)	(1.3		)
Accounts receivable, net	$	685.1		$	722.2

In October 2017, the Company entered into an agreement (the “Receivable Sales Agreement”), to sell, on a revolving basis, certain trade accounts receivable balances to a third party financial institution. Transfers under this agreement are accounted for as sales of receivables resulting in the receivables being de-recognized from the balance sheet. The Receivable Sales Agreement

15

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

provides for the continuing sale of certain receivables on a revolving basis until terminated by either party. The receivables under the Receivable Sales Agreement are sold without recourse to the third party financial institution. During 2018, $4,145.5 of accounts receivable were sold via this arrangement. The proceeds from these sales of receivables are included in cash from operating activities in the Consolidated Statement of Cash Flows. The recorded net loss on sale of receivables is $12.3 for the nine months ended September 27, 2018 and is included in Other income and expense. See Note 21, Other (Expense) Income, net.

7.  Contract Assets and Contract Liabilities

Contract assets primarily represent revenues recognized for performance obligations that have been satisfied but for which amounts have not been billed. Contract assets, current are those for which performance obligations are expected to be fully satisfied within 12 months of contract origination and contract assets, long-term are expected to be fully satisfied over periods greater than 12 months. No impairments to contract assets were recorded for the period ended September 27, 2018.

Contract liabilities are established for cash received that is in excess of revenues recognized and are contingent upon the satisfaction of performance obligations. Contract liabilities primarily consist of cash received on contracts for which revenue has been deferred since the receipts are in excess of transaction price resulting from the allocation of consideration based on relative standalone selling price to future units (including those under option that the Company believes are likely to be exercised) with prices that are lower than standalone selling price. These contract liabilities will be recognized earlier if the options are not fully exercised, or immediately, if the contract is terminated prior to the options being fully exercised.

	January 1, 2018			September 27, 2018			Change
Contract assets	$	517.8		$	566.7		$	48.9
Contract liabilities	(319.4		)	(507.3		)	(187.9		)
Net contract asset	$	198.4		$	59.4		$	(139.0	)

The increase in contract assets reflects the net impact of additional revenue recognized in excess of billed revenues during the period. The increase in contract liabilities reflects the net impact of additional deferred revenues recorded in excess of revenue recognized during the period. For the period ended September 27, 2018, the Company recognized $40.1 of revenue that was included in the contract liability balance at the beginning of the period.

8.  Performance Obligations

Unsatisfied, or partially unsatisfied, performance obligations that are expected to be recognized in the future are noted in the table below. The Company expects options to be exercised in addition to the amounts presented below.

	Remaining in 2018	2019	2020	2021 and After
Unsatisfied performance obligations	$1,320.4	$6,302.7	$5,680.9	$1,648.3

9.  Inventory

Inventory consists of raw materials used in the production process, work-in-process, which is direct material, direct labor, overhead and purchases, and capitalized preproduction costs. Raw materials are stated at lower of cost (principally on an actual or average cost basis) or market. Capitalized pre-production costs include certain contract costs, including applicable overhead, incurred before a product is manufactured on a recurring basis. These costs are typically amortized over a period that is consistent with the satisfaction of the underlying performance obligations to which these relate. See Note 3, Summary of Significant Accounting Policies - Inventory.

For 2017, deferred production includes costs for the excess of production costs over the estimated average cost per shipset, and credit balances for favorable variances on contracts between actual costs incurred and the estimated average cost per shipset for units delivered under the current production blocks. Recovery of excess-over-average deferred production costs is dependent on the number of shipsets ultimately sold and the ultimate selling prices and lower production costs associated with future production under these contract blocks. Forward loss reserves on contract blocks are recorded in the period in which they become evident

16

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

and are included as a reduction to inventory with remaining amounts, if any, reflected in accrued deferred revenue. Inventories are summarized as follows:

	September 27, 2018		December 31, 2017
Raw materials	$	251.3	$	321.0
Work-in-process(1)	631.0		854.4
Finished goods	8.9		35.8
Product inventory	891.2		1,211.2
Capitalized pre-production(2)	39.8		78.9
Deferred production(3)	—		640.3
Forward loss provision(4)	—		(480.5		)
Total inventory, net	$	931.0	$	1,449.9

(1) For the period ended September 27, 2018, work-in-process inventory includes direct labor, direct material, overhead and purchases on contracts for which revenue is recognized at a point in time as well as sub-assembly parts that have not been issued to production on contracts for which revenue is recognized using the input method. For the period ended December 31, 2017, work-in-process included direct labor, direct material, overhead and purchases on all contracts that were accounted for using the units of delivery method. For the period ended September 27, 2018, work-in-process inventory includes $152.9 of costs incurred in anticipation of specific contracts and no impairments were recorded in the period.

(2) As part of the Transition Adjustment, $43.0 (pretax) of pre-production costs on the A350 XWB were eliminated.

(3) As part of the Transition Adjustment, $640.3 (pretax) of deferred production was eliminated. For the period ended December 31, 2017, the balance contained $632.8 and $129.3 on the A350 XWB and Rolls-Royce BR725 programs, respectively.

(4) For the period ended September 27, 2018, forward loss reserves of $219.9 have been classified as a liability in the condensed consolidated balance sheet. For the period ended December 31, 2017, the forward loss reserve for the B787 program exceeded the program's inventory balance. This excess was classified as a liability and reported in other current liabilities on the balance sheet in the amount of $254.5 as of December 31, 2017.

10.  Property, Plant and Equipment, net

Property, plant and equipment, net consists of the following: 

	September 27, 2018			December 31, 2017
Land	$	15.5		$	15.9
Buildings (including improvements)	813.3			764.1
Machinery and equipment	1,630.3			1,529.9
Tooling	1,027.2			1,013.9
Capitalized software	269.2			263.3
Construction-in-progress	212.5			213.4
Total	3,968.0			3,800.5
Less: accumulated depreciation	(1,845.0		)	(1,695.2		)
Property, plant and equipment, net	$	2,123.0		$	2,105.3

Repair and maintenance costs are expensed as incurred. The Company recognized repair and maintenance costs of $31.3 and $37.6 for the three months ended September 27, 2018 and September 28, 2017, respectively, and $99.0 and $88.9 for the nine months ended September 27, 2018 and September 28, 2017, respectively.

17

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

The Company capitalizes certain costs, such as software coding, installation, and testing, that are incurred to purchase or to create and implement internal-use computer software.  Depreciation expense related to capitalized software was $4.1 and $4.5 for the three months ended September 27, 2018 and September 28, 2017, respectively, and $12.7 and $14.8 for the nine months ended September 27, 2018 and September 28, 2017, respectively.

The Company reviews capital and amortizing intangible assets (long-lived assets) for impairment on an annual basis or whenever events or changes in circumstances indicate that the carrying amount may not be recoverable.  The Company evaluated its long-lived assets at its locations and determined no impairment was necessary for the period ended September 27, 2018.

11.  Other Assets

Other assets are summarized as follows:

	September 27, 2018			December 31, 2017
Intangible assets
Patents	$	1.9		$	1.9
Favorable leasehold interests	6.3			6.3
Total intangible assets	8.2			8.2
Less: Accumulated amortization - patents	(1.9		)	(1.8		)
Accumulated amortization - favorable leasehold interest	(4.8		)	(4.6		)
Intangible assets, net	1.5			1.8
Deferred financing
Deferred financing costs	41.7			39.5
Less: Accumulated amortization - deferred financing costs	(35.3		)	(33.7		)
Deferred financing costs, net	6.4			5.8
Other
Goodwill - Europe	2.4			2.5
Equity in net assets of affiliates	—			4.7
Supply agreements(1)	16.3			19.9
Restricted cash - collateral requirements	20.2			20.0
Deferred Tax Asset - non-current	194.9			72.5
Other	43.2			37.1
Total	$	284.9		$	164.3

(1)    Under two agreements, certain payments accounted for as consideration paid by the Company to a customer and a supplier are being amortized as reductions to net revenues.

12.  Advance Payments

Advances on the B787 Program.  Boeing has made advance payments to Spirit under the B787 Supply Agreement, that are required to be repaid to Boeing by way of offset against the purchase price for future shipset deliveries. Advance repayments were scheduled to be spread evenly over the remainder of the first 1,000 B787 shipsets delivered to Boeing. On April 8, 2014, the Company signed a memorandum of agreement with Boeing that suspended advance repayments related to the B787 program for a period of twelve months beginning April 1, 2014. Repayment recommenced on April 1, 2015, and any repayments which otherwise would have become due during such twelve-month period will offset the purchase price for shipsets 1,001 through 1,120. In the event Boeing does not take delivery of a sufficient number of shipsets to repay the full amount of advances prior to the termination of the B787 program or the B787 Supply Agreement, any advances not then repaid will be applied against any outstanding payments then due by Boeing to us, and any remaining balance will be repaid in annual installments of $42.0 due on December 15th of each

18

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

year until the advance payments have been fully recovered by Boeing. As of September 27, 2018, the amount of advance payments received by us from Boeing under the B787 Supply Agreement and not yet repaid was approximately $256.6.

13.  Fair Value Measurements

The FASB’s authoritative guidance on fair value measurements defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. It also establishes a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The guidance discloses three levels of inputs that may be used to measure fair value:

Level 1 Quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt and equity securities and derivative contracts that are traded in an active exchange market.

Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments and derivative contracts whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. Observable inputs, such as current and forward interest rates and foreign exchange rates, are used in determining the fair value of the interest rate swaps and foreign currency hedge contracts.

Level 3 Unobservable inputs that are supported by little or no market activity and are significant to the fair value of assets and liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

At September 27, 2018 and December 31, 2017, the Company did not hold any cash within money market funds.

The Company’s long-term debt includes a senior unsecured term loan and senior unsecured notes.  The estimated fair value of the Company’s debt obligations is based on the quoted market prices for such obligations or the historical default rate for debt with similar credit ratings. The following table presents the carrying amount and estimated fair value of long-term debt:

	September 27, 2018					December 31, 2017
	Carrying Amount		Fair Value			Carrying Amount		Fair Value
Senior unsecured term loan A (including current portion)	$	204.9	$	204.7	(2)	$	460.7	$	461.9	(2)
Senior unsecured notes due 2021	298.4		299.0		(1)	—		—		(1)
Senior unsecured notes due 2022	—		—		(1)	294.8		304.6		(1)
Senior unsecured notes due 2023	297.8		296.8		(1)	—		—		(1)
Senior unsecured notes due 2026	297.5		284.3		(1)	297.2		301.0		(1)
Senior unsecured notes due 2028	693.3		689.4		(1)	—		—		(1)
Total	$	1,791.9	$	1,774.2		$	1,052.7	$	1,067.5

(1) Level 1 Fair Value hierarchy

(2) Level 2 Fair Value hierarchy 

14.  Derivative and Hedging Activities

The Company has historically entered into interest rate swap agreements to reduce its exposure to the variable rate portion of its long-term debt. The Company also considers counterparty credit risk and its own credit risk in its determination of all estimated fair values.

19

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

The Company has historically entered into derivative instruments covered by master netting arrangements whereby, in the event of a default as defined by the 2018 Credit Agreement (as defined below) or termination event, the non-defaulting party has the right to offset any amounts payable against any obligation of the defaulting party under the same counterparty agreement. See Note 15, Debt, for more information.

Interest Rate Swaps

On March 15, 2017, the Company entered into an interest rate swap agreement, with an effective date of March 31, 2017. The swaps have a notional value of $250.0 and fix the variable portion of the Company’s floating rate debt at 1.815%. The fair value of the interest rate swaps, using Level 2 inputs, was an asset of $3.5 and $0.9 as of September 27, 2018 and December 31, 2017, respectively. The Company recorded a net gain related to swap activity of $0.3 and $2.6, for the three and nine months ended September 27, 2018, respectively.

Foreign Currency Forward Contract

As described further in Note 23, Asco Acquisition, the Company and its wholly-owned subsidiary Spirit AeroSystems Belgium Holdings BVBA (“Spirit Belgium”) entered into a definitive agreement (the “Purchase Agreement”) with certain private sellers pursuant to which Spirit Belgium will purchase all of the issued and outstanding equity of S.R.I.F. N.V., the parent company of Asco Industries N.V. (“Asco”) for $650.0 in cash, subject to certain customary closing adjustments, including foreign currency adjustments. As such, movements in the Euro exchange rates could cause the purchase price to fluctuate, affecting our cash flows.

To reduce the Company's exposure to currency exchange rate fluctuations, the Company entered into foreign currency forward contracts. The objective of these contracts is to minimize the impact of currency exchange rate movements on the Company's cash flows, however the Company has not designated these forward contracts as a hedge and has not applied hedge accounting to them. During the second quarter of 2018, to reduce the Euro exchange rate exposure of the purchase of Asco, the Company entered into a foreign currency forward contract in the amount of $580.0; this foreign currency forward contract was settled in the third quarter of 2018. Additionally, during the third quarter of 2018, to reduce the Euro exchange rate exposure of the purchase of Asco, the Company entered into a foreign currency forward contract in the amount of $568.3. The fair value of the foreign currency forward contract, using Level 2 inputs, was a liability of $6.0 as of September 27, 2018. The Company recorded a net gain related to foreign currency forward contract activity of $0.8 for the three months ended September 27, 2018 and a net loss of $20.7 for the nine months ended September 27, 2018.

15.  Debt

Total debt shown on the balance sheet is comprised of the following: 

	September 27, 2018				December 31, 2017
	Current		Noncurrent		Current		Noncurrent
Senior unsecured term loan A	$	17.1	$	187.8	$	24.9	$	435.8
Senior notes due 2021	—		298.4		—		—
Senior notes due 2022	—		—		—		294.8
Senior notes due 2023	—		297.8		—		—
Senior notes due 2026	—		297.5		—		297.2
Senior notes due 2028	—		693.3		—		—
Present value of capital lease obligations	6.9		36.3		5.2		33.6
Other	1.0		58.6		1.0		58.5
Total	$	25.0	$	1,869.7	$	31.1	$	1,119.9

2018 Credit Agreement

20

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

On July 12, 2018, the Company entered into a $1,260.0 senior unsecured Second Amended and Restated Credit Agreement among Spirit AeroSystems, Inc., as borrower (“Spirit” or the “Borrower”), the Company, as parent guarantor, the lenders party thereto, Bank of America, N.A., as administrative agent, and the other agents named therein (the “2018 Credit Agreement”), consisting of a $800.0 revolving credit facility (the “2018 Revolver”), a $206.0 term loan A facility (the “2018 Term Loan”) and a $250.0 delayed draw term loan facility (the “Delayed Draw Term Loan”).

Each of the 2018 Revolver, the 2018 Term Loan and the Delayed Draw Term Loan matures July 12, 2023, and bears interest, at Spirit’s option, at either LIBOR plus 1.375% or a defined “base rate” plus 0.375%, subject to adjustment to between LIBOR plus 1.125% and LIBOR plus 1.875% (or between base rate plus 0.125% and base rate plus 0.875%, as applicable) based on changes to Spirit’s senior unsecured debt rating provided by Standard & Poor’s Financial Services LLC and/or Moody’s Investors Service, Inc. The principal obligations under the 2018 Term Loan are to be repaid in equal quarterly installments of $2.6, commencing with the fiscal quarter ending March 31, 2019, and with the balance due at maturity of the 2018 Term Loan. The principal obligations under the Delayed Draw Term Loan are to be repaid in equal quarterly installments of 1.25% of the outstanding principal amount of the Delayed Draw Term Loan as of March 31, 2019, subject to adjustments for any extension of the availability period of the Delayed Draw Term Loan, with the balance due at maturity of the Delayed Draw Term Loan.

The Delayed Draw Term Loan is available for Spirit to draw until January 12, 2019, at which date it may be extended for two additional three-month periods, in each instance subject to Spirit’s payment of a fee to the relevant lenders based on the undrawn Delayed Draw Term Loan commitment.

The 2018 Credit Agreement also contains an accordion feature that provides Spirit with the option to increase the 2018 Revolver commitments and/or institute one or more additional term loans by an amount not to exceed $750.0 in the aggregate, subject to the satisfaction of certain conditions and the participation of the lenders. The 2018 Credit Agreement contains customary affirmative and negative covenants, including certain financial covenants that are tested on a quarterly basis. Spirit’s obligations under the 2018 Credit Agreement may be accelerated upon an event of default, which includes non-payment of principal or interest, material breach of a representation or warranty, material breach of a covenant, cross-default to material indebtedness, material judgments, ERISA events, change in control, bankruptcy and invalidity of the guarantee of Spirit’s obligations under the 2018 Credit Agreement made by the Company.

As a result of the extinguishment of the Company's prior credit agreement, the Company recognized a loss on extinguishment of $1.3, all of which is reflected within amortization of deferred financing fees on the Condensed Consolidated Statement of Cash Flows for the nine months ended September 27, 2018. As of September 27, 2018, the outstanding balance of the 2018 Term Loan was $206.3 and the carrying value was $204.9.

Senior Notes

2022 Notes

On May 22, 2018, the Company commenced an offer to purchase for cash (the “Tender Offer”) any and all of the $300.0 outstanding principal amount of our 5 1/4% Senior Notes due 2022 (the “2022 Notes”). The Tender Offer was made pursuant to an Offer to Purchase dated May 22, 2018, and a related Letter of Transmittal and Notice of Guaranteed Delivery, which set forth the terms and conditions of the Tender Offer in full detail. Under the terms of the Tender Offer, holders of 2022 Notes who validly tendered their notes at or prior to May 29, 2018 would receive, in whole dollars, $1,028.50 per $1,000 principal amount of Notes tendered. Tendering holders will also receive accrued and unpaid interest from the last applicable interest payment date to, but not including, the settlement date of the Tender Offer.

On May 30, 2018, Spirit repurchased $202.6 aggregate principal amount of its 2022 Notes pursuant to the Tender Offer. In addition, on June 29, 2018, Spirit redeemed the remaining $97.4 aggregate principal amount of the 2022 Notes outstanding. The redemption price of the 2022 Notes was 102.85% of the principal amount thereof, plus accrued and unpaid interest to, but not including, the redemption date of June 29, 2018. Following the redemption on June 29, 2018, none of the 2022 Notes remain outstanding.

As a result of the extinguishment of the 2022 Notes, the Company recognized a loss on extinguishment of $13.2, all of which is reflected within amortization of deferred financing fees on the Condensed Consolidated Statement of Cash Flows for the nine months ended September 27, 2018.

21

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

New Notes

On May 30, 2018, Spirit entered into an Indenture (the “Indenture”) by and among Spirit, the Company and The Bank of New York Mellon Trust Company, N.A. (the “Trustee”), as trustee in connection with Spirit’s offering of $300.0 aggregate principal amount of its Senior Floating Rate Notes due 2021 (the “Floating Rate Notes”), $300.0 aggregate principal amount of its 3.950% Senior Notes due 2023 (the “2023 Notes”) and $700.0 aggregate principal amount of its 4.600% Senior Notes due 2028 (the “2028 Notes” and, together with the Floating Rate Notes and the 2023 Notes, the “New Notes”). The Company guaranteed Spirit’s obligations under the Notes on a senior unsecured basis (the “Guarantees”).

The Floating Rate Notes bear interest at a rate per annum equal to three-month LIBOR, as determined in the case of the initial interest period, on May 25, 2018, and thereafter at the beginning of each quarterly period as described herein, plus 80 basis points and mature on June 15, 2021. Interest on the Floating Rate Notes is payable on March 15, June 15, September 15 and December 15 of each year, beginning on September 15, 2018.The 2023 Notes bear interest at a rate of 3.950% per annum and mature on June 15, 2023. The 2028 Notes bear interest at a rate of 4.600% per annum and mature on June 15, 2028. Interest on the 2023 Notes and 2028 Notes is payable on June 15 and December 15 of each year, beginning on December 15, 2018. The carrying value of the Floating Rate Notes, 2023 Notes, and 2028 Notes was $298.4, $297.8, and $693.3 as of September 27, 2018, respectively.

The Notes and the Guarantees have been registered under the Securities Act of 1933, as amended (the “Act”), pursuant to a Registration Statement on Form S-3 (No. 333-211423) previously filed with the SEC under the Act.

The Indenture contains covenants that limit Spirit’s, the Company’s and certain of the Company’s subsidiaries’ ability, subject to certain exceptions and qualifications, to create liens without granting equal and ratable liens to the holders of the New Notes and enter into sale and leaseback transactions. These covenants are subject to a number of qualifications and limitations. In addition, the Indenture provides for customary events of default.

2026 Notes

In June 2016, the Company issued $300.0 in aggregate principal amount of 3.850% Senior Notes due June 15, 2026 (the “2026 Notes”) with interest payable, in cash in arrears, on June 15 and December 15 of each year, beginning December 15, 2016. The carrying value of the 2026 Notes was $297.5 as of September 27, 2018.

16.Pension and Other Post-Retirement Benefits

	Defined Benefit Plans
	For the Three Months Ended						For the Nine Months Ended
Components of Net Periodic Pension Income	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Service cost	$	0.2		$	0.2		$	0.6		$	0.7
Interest cost	9.2			9.4			27.4			28.3
Expected return on plan assets	(17.4		)	(18.2		)	(52.3		)	(54.6		)
Amortization of net loss	—			0.1			—			0.1
Net periodic pension income	$	(8.0	)	$	(8.5	)	$	(24.3	)	$	(25.5	)

22

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

	Other Benefits
	For the Three Months Ended						For the Nine Months Ended
Components of Other Benefit Income	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Service cost	$	0.3		$	0.3		$	0.8		$	0.9
Interest cost	0.3			0.3			0.8			0.9
Amortization of prior service cost	(0.2		)	(0.2		)	(0.7		)	(0.7		)
Amortization of net gain	(0.6		)	(0.5		)	(1.7		)	(1.6		)
Net periodic other benefit income	$	(0.2	)	$	(0.1	)	$	(0.8	)	$	(0.5	)

Employer Contributions

The Company expects to contribute zero dollars to the U.S. qualified pension plan and a combined total of approximately $7.4 for the Supplemental Executive Retirement Plan (“SERP”) and post-retirement medical plans in 2018.  The Company’s projected contributions to the U.K. pension plan for 2018 are $1.8. The entire amount contributed can vary based on exchange rate fluctuations.

17.  Stock Compensation

The Company recognized a net total of $6.3 and $4.8 of stock compensation expense for the three months ended September 27, 2018 and September 28, 2017, respectively. The Company recognized a net total of $19.9 and $15.9 of stock compensation expense for the nine months ended September 27, 2018 and September 28, 2017, respectively.

During the nine months ended September 27, 2018, 242,419 shares, 92,375 shares, and 63,904 shares of class A common stock with aggregate grant date fair values of $21.5, $8.4 and $5.7 were granted under the service-based, market-based, and performance based portions of the Company’s LTIAs, respectively. Additionally, 460,028 shares of class A common stock with an aggregate grant date fair value of $24.2 that were LTIAs vested during the three months ended September 27, 2018.

18. Income Taxes

The process for calculating the Company’s income tax expense involves estimating actual current taxes due plus assessing temporary differences arising from differing treatment for tax and accounting purposes that are recorded as deferred tax assets and liabilities. Deferred tax assets are periodically evaluated to determine their recoverability. The total net deferred tax asset at September 27, 2018, and December 31, 2017, was $194.5 and $72.2, respectively. The difference is primarily due to the creation of deductible temporary differences within the Transition Adjustment, and the creation of deductible temporary differences and utilization of taxable temporary differences within the current year.

The Company files income tax returns in all jurisdictions in which it operates. The Company establishes reserves to provide for additional income taxes that may be due upon audit. These reserves are established based on management’s assessment as to the potential exposure attributable to permanent tax adjustments and associated interest. All tax reserves are analyzed quarterly and adjustments made as events occur that warrant modification.

In general, the Company records income tax expense each quarter based on its estimate as to the full year’s effective tax rate. Certain items, however, are given discrete period treatment and the tax effects for such items are therefore reported in the quarter that an event arises. Events or items that may give rise to discrete recognition include excess tax benefits with respect to share-based compensation, finalizing amounts in income tax returns filed, finalizing audit examinations for open tax years and expiration of statutes of limitations and changes in tax law.

On December 22, 2017, President Trump signed into law legislation referred to as the “Tax Cuts and Jobs Act” (the “TCJA”). The staff of the SEC has recognized the complexity of reflecting the impacts of the TCJA, and on December 22, 2017, issued guidance in Staff Accounting Bulletin 118 (“SAB 118”) which clarifies accounting for income taxes under ASC 740 if information is not yet available or complete and provides for up to a one-year period in which to complete the required analyses and accounting

23

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

(the measurement period). SAB 118 describes three scenarios (or “buckets”) associated with a company’s status of accounting for income tax reform: (1) a company is complete with its accounting for certain effects of tax reform, (2) a company is able to determine a reasonable estimate for certain effects of tax reform and records that estimate as a provisional amount, or (3) a company is not able to determine a reasonable estimate and therefore continues to apply ASC 740, based on the provisions of the tax laws that were in effect immediately prior to the TCJA being enacted.

The Company is substantially complete with its accounting for the one-time transition tax liability, enacted by the TCJA, during the third quarter of 2018. As a result, the Company decreased its December 31, 2017 provisional amount by $2.8, which is included as a component of income tax expense from continuing operations. To the extent that the U.S. Treasury issues additional guidance during the SAB 118 measurement period, the Company will promptly evaluate whether any additional adjustments are required.

The TCJA subjects a US stockholder to tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries for years ending after December 31, 2017. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred as a period expense. At September 27, 2018, because the Company is still evaluating the effects of the GILTI provisions, an accounting policy on whether the Company will account for GILTI as a period expense or record deferred taxes for anticipated GILTI has not been made. The Company's accounting for the effects of the GILTI provision is incomplete, however the Company has included estimated GILTI tax related to current-year operations in the Company's annualized effective tax rate and has not provided additional GILTI on deferred items.

The TCJA also introduces base erosion and anti-abuse tax provisions (“BEAT”) for companies that meet certain thresholds by effectively excluding deductions on certain payments to foreign related entities. Although the Company's analysis of the tax effects of the BEAT provision is incomplete the Company does not expect to be subject to the tax.

In January 2018, the FASB issued ASU 2018-02, which gives entities the option to reclassify to retained earnings the tax effects resulting from the TCJA that are stranded in accumulated other comprehensive income (“AOCI”).

The new guidance may be applied retrospectively to each period in which the effect of the TCJA is recognized in the period of adoption. The Company must adopt this guidance for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted for periods for which financial statements have not yet been issued or made available for issuance, including the period the TCJA was enacted. The guidance, when adopted, will require new disclosures regarding a company’s accounting policy for releasing the tax effects in AOCI. The Company is currently evaluating how to apply the new guidance and has not determined whether it will elect to reclassify stranded amounts. The adoption of ASU 2018-02 is not expected to have a material effect on its consolidated financial statements.

The 18.5% effective tax rate for the nine months ended September 27, 2018 differs from the 26.8% effective tax rate for the same period of 2017 primarily due to the enactment of the TCJA, including the reduction in the U.S. corporate federal income tax rate from 35% to 21% and the elimination of the domestic manufacturing deduction, and unrelated to the TCJA, higher state income tax credits generated in 2018 offset by the proportional tax rate effects of lower pre-tax income in 2017.

The Company will continue to participate in the Internal Revenue Service’s Compliance Assurance Process (“CAP”) program for its 2018 tax year. The CAP program’s objective is to resolve issues in a timely, contemporaneous manner and eliminate the need for a lengthy post-filing examination.  There are no open audits in the Company’s foreign jurisdictions. The Company expects no material change in its recorded unrecognized tax benefit liability in the next 12 months

19.  Equity

Accelerated Share Repurchase Program

In May 2018, the Company entered into accelerated share repurchase agreements (“ASRs”) with Morgan Stanley & Co. LLC and Goldman Sachs & Co. LLC (collectively, the “Dealers”) to repurchase in total $725.0 of the Company’s class A common stock. Under the ASRs, the Company delivered a total of $725.0 in cash to the Dealers and received a total of 7.3 million shares which represented approximately 85% of the total common shares expected to be repurchased under the ASRs based on the closing price on the day the Company entered into the ASRs. The final number of shares to be repurchased and the final average price per

24

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

share under the ASRs will depend on the volume-weighted average price of the Company’s class A common stock, less a discount, during the term of the agreement. All purchases under the ASRs are expected to be completed in the fourth quarter of 2018.

For further information regarding the ASRs, refer to the Company's Current Report on Form 8-K filed with the SEC on May 30, 2018.

The Company accounts for the ASRs as two separate transactions: (i) as shares of reacquired common stock for the shares delivered to us upon effectiveness of the ASRs and (ii) as a forward contract indexed to the Company's own common stock for the undelivered shares. The initial delivery of shares is included in treasury stock at cost and results in an immediate reduction of the outstanding shares used to calculate the weighted average common shares outstanding for basic and diluted earnings per share. The forward contracts indexed to the Company's own common stock meet the criteria for equity classification, and these amounts are initially recorded in additional paid-in capital and reclassified to treasury stock upon completion of the ASRs.

Earnings per Share Calculation

Basic net income per share is computed using the weighted-average number of outstanding shares of common stock during the measurement period. Diluted net income per share is computed using the weighted-average number of outstanding shares of common stock and, when dilutive, potential outstanding shares of common stock during the measurement period.

The Company accounts for treasury stock under the cost method and includes treasury stock as a component of stockholders’ equity. As of September 27, 2018, no treasury shares have been reissued or retired.

The following table sets forth the computation of basic and diluted earnings per share:

	For the Three Months Ended
	September 27, 2018					September 28, 2017
	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Basic EPS
Income available to common stockholders	$	168.7	105.1	$	1.61	$	147.1	115.8	$	1.27
Income allocated to participating securities	0.1		0.1			0.1		0.1
Net income	$	168.8				$	147.2
Diluted potential common shares			0.9					1.1
Diluted EPS
Net income	$	168.8	106.1	$	1.59	$	147.2	117.0	$	1.26

	For the Nine Months Ended
	September 27, 2018					September 28, 2017
	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Basic EPS
Income available to common shareholders	$	439.1	109.3	$	4.02	$	231.9	117.8	$	1.97
Income allocated to participating securities	0.3		0.1			0.2		0.1
Net income	$	439.4				$	232.1
Diluted potential common shares			0.9					1.1
Diluted EPS
Net income	$	439.4	110.3	$	3.98	$	232.1	119.0	$	1.95

25

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Included in the outstanding common shares were 1.4 million and 1.5 million of issued but unvested shares at September 27, 2018 and September 28, 2017, respectively, which are excluded from the basic EPS calculation.

For the impact of the transition adjustment due to the adoption ASC 606 on retained earnings, see Note 2, Adoption of New Accounting Standards.

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss is summarized by component as follows:

	As of			As of
	September 27, 2018			December 31, 2017
Pension	$	(76.0	)	$	(75.9	)
SERP/Retiree medical	16.0			17.7
Foreign currency impact on long term intercompany loan	(15.5		)	(14.2		)
Currency translation adjustment	(69.5		)	(56.1		)
Total accumulated other comprehensive loss	$	(145.0	)	$	(128.5	)

20.  Commitments, Contingencies and Guarantees

Litigation

From time to time the Company is subject to, and is presently involved in, litigation or other legal proceedings arising in the ordinary course of business. While the final outcome of these matters cannot be predicted with certainty, considering, among other things, the meritorious legal defenses available, it is the opinion of the Company that none of these items, when finally resolved, will have a material adverse effect on the Company’s long-term financial position or liquidity.

From time to time, in the ordinary course of business and similar to others in the industry, the Company receives requests for information from government agencies in connection with their regulatory or investigational authority. Such requests can include subpoenas or demand letters for documents to assist the government in audits or investigations. The Company reviews such requests and notices and takes appropriate action. Additionally, the Company is subject to federal and state requirements for protection of the environment, including those for disposal of hazardous waste and remediation of contaminated sites. As a result, the Company is required to participate in certain government investigations regarding environmental remediation actions.

Pension Indemnification.On December 5, 2014, Boeing filed a complaint in Delaware Superior Court, Complex Commercial Litigation Division, entitled The Boeing Co. v. Spirit AeroSystems, Inc., No. N14C-12-055 (EMD) (the “Complaint”) seeking indemnification of approximately $139.0 from Spirit for (a) damages assessed against Boeing in International Union, United Automobile, Aerospace and Agricultural Workers of America v. Boeing Co., AAA Case No. 54 300 00795 07 (“UAW Arbitration”), which was brought on behalf of certain former Boeing employees in Tulsa and McAlester, Oklahoma, (b) claims that Boeing settled in Society of Professional Engineering Employees in Aerospace v. Boeing Co., Nos. 05-1251-MLB, 07-1043-MLB (D. Kan.) (“Harkness Class Action”), and (c) attorneys’ fees Boeing alleges it expended to defend the UAW Arbitration and Harkness Class Action, as well as reasonable fees, costs and expenses Boeing expends litigating the case against Spirit. Boeing’s Complaint asserts that the damages assessed against Boeing in the UAW Arbitration and the claims settled by Boeing in the Harkness Class Action are liabilities that Spirit assumed under an Asset Purchase Agreement between Boeing and Spirit, dated February 22, 2005 (the “APA”). Boeing asserts claims for breach of contract and declaratory judgment regarding its indemnification rights under the APA.

Spirit asserted a Counterclaim against Boeing, on the ground that the liabilities at issue were Boeing’s responsibility under the APA. Spirit’s Counterclaim alleges breach of contract and seeks a declaratory judgment regarding Spirit’s right to indemnification from Boeing under the APA. Spirit’s Counterclaim seeks to recover the amounts that Spirit spent litigating the Harkness Class Action, responding to Boeing’s indemnification demands concerning the Harkness Class Action and UAW Arbitration, and also litigating the current lawsuit against Boeing.

26

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

On December 20, 2016, Boeing and Spirit moved for summary judgment. On June 27, 2017, the Delaware Superior Court (the “Superior Court”) issued an order denying Boeing’s Motion for Summary Judgment and granting Spirit’s Motion for Summary Judgment, finding that the liabilities at issue were excluded liabilities under the APA and holding that Spirit is entitled to recover reasonable attorneys' fees, costs and other expenses from Boeing. The Court granted Spirit’s motion as to fees, costs, and expenses incurred as a result of the litigation and underlying matters and denied the motion as to pre- and post-trial interest.

Boeing appealed the Superior Court’s decision to the Supreme Court of the State of Delaware (the “Supreme Court”). On July 12, 2018, a unanimous three judge panel of the Supreme Court ruled in favor of Spirit and on July 26, 2018, the Supreme Court denied Boeing’s Motion for Reargument and returned the case to the Superior Court.  Spirit sought recovery of additional attorneys’ fees, costs, and other expenses incurred during the appellate process.  On August 22, 2018, the Superior Court granted Spirit’s motion.  Spirit has since recouped all amounts to which it was entitled by court order. This matter is now closed.

Contractual Terms Clarification. On July 6, 2018, Spirit filed a complaint in Washington Superior Court captioned Spirit AeroSystems, Inc. v. The Boeing Company (No. 18-2-16649-7  SEA).  Spirit is seeking payment of money that Boeing owes Spirit for product ordered by Boeing and delivered by Spirit. As of the date of filing the complaint, Boeing has underpaid Spirit approximately $64.0. Boeing claims to be withholding money due to customer warranty claims, which are technical in nature and largely relate to designs that predate Spirit’s separation from Boeing in 2005.  Spirit disputes its liability for those claims.  Spirit is also asking the court to clarify the parties’ contractual obligations, including that Boeing has no right under the parties’ contracts to withhold money presently due based on disputed warranty claims on past orders. On September 5, 2018, Boeing moved to dismiss three of Spirit’s claims without prejudice and one claim with prejudice. The parties are currently briefing this motion, and the Court has scheduled oral argument for November 16, 2018. Discovery in the case is ongoing.

Customer and Vendor Claims

From time to time the Company receives, or is subject to, customer and vendor claims arising in the ordinary course of business, including, but not limited to, those related to product quality and late delivery. The Company accrues for matters when losses are deemed probable and reasonably estimable. In evaluating matters for accrual and disclosure purposes, we take into consideration factors such as our historical experience with matters of a similar nature, the specific facts and circumstances asserted, the likelihood of an unfavorable outcome, and the severity of any potential loss. Any accruals deemed necessary are reevaluated and updated as matters progress over time.

On October 1, 2018, the Company received notice of a claim related to factory disruptions. Claims are inherently uncertain as they typically include many unsubstantiated items and factual disputes. As such, the Company does not believe it is possible to develop an estimate of reasonably possible loss for this matter. The Company has requested further information and supporting documentation and will continue to re-evaluate the claim. The Company usually resolves claims received in the ordinary course of business in the context of its broad, long-term relationships.

While the final outcome of these types of matters cannot be predicted with certainty, considering, among other things, the factual and legal defenses available, it is the opinion of the Company that, when finally resolved, no current claims will have a material adverse effect on the Company’s long-term financial position or liquidity. However, it is possible that the Company’s results of operations in a period could be materially affected by one or more of these other matters.

Guarantees

Outstanding guarantees were $18.8 and $23.2 as of September 27, 2018, and December 31, 2017, respectively.

Restricted Cash - Collateral Requirements

The Company was required to maintain $20.2 and $20.0 of restricted cash as of September 27, 2018 and December 31, 2017, respectively, related to certain collateral requirements for obligations under its workers’ compensation programs. The restricted cash is included in “Other assets” in the Company’s Condensed Consolidated Balance Sheets.

Indemnification

27

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

The Company has entered into customary indemnification agreements with its non-employee directors, and certain executive employment agreements include indemnification provisions. Under those agreements, the Company agrees to indemnify each of these individuals against claims arising out of events or occurrences related to that individual’s service as the Company’s agent or the agent of any of its subsidiaries to the fullest extent legally permitted.

The Company has agreed to indemnify parties for specified liabilities incurred, or that may be incurred, in connection with transactions they have entered into with the Company. The Company is unable to assess the potential number of future claims that may be asserted under these indemnities, nor the amounts thereof (if any). As a result, the Company cannot estimate the maximum potential amount of future payments under these indemnities and therefore, no liability has been recorded.

Service and Product Warranties and Extraordinary Rework

Provisions for estimated expenses related to service and product warranties and certain extraordinary rework are evaluated on a quarterly basis. These costs are accrued and are recorded to unallocated cost of goods sold. These estimates are established using historical information on the nature, frequency, and average cost of warranty claims, including the experience of industry peers. In the case of new development products or new customers, Spirit considers other factors including the experience of other entities in the same business and management judgment, among others. Service warranty and extraordinary rework is reported in current liabilities and other liabilities on the balance sheet.

The warranty balance presented in the table below includes unresolved warranty claims that are in dispute in regards to their value as well as their contractual liability. The Company estimated the total costs related to some of these claims, however, there is significant uncertainty surrounding the disposition of these disputed claims and as such, the ultimate determination of the provision’s adequacy requires significant management judgment. The amount of the specific provisions recorded against disputed, reasonably possible warranty claims was $104.3 and $101.0 as of September 27, 2018, and December 31, 2017, respectively. These specific provisions represent the Company’s best estimate of reasonably possible warranty claims. Should the Company incur higher than expected warranty costs and/or discover new or additional information related to these warranty provisions, the Company may incur additional charges that exceed these recorded provisions. The Company utilized available information to make appropriate assessments, however, the Company recognizes that data on actual claims experience is of limited duration and therefore, claims projections are subject to significant judgment. The amount of the warranty claims in excess of the disputed, reasonably possible specific warranty provision was $174.7 as of September 27, 2018, and $223.0 as of December 31, 2017.

The following is a roll forward of the service warranty and extraordinary rework balance at September 27, 2018:

Balance, December 31, 2017	$	166.4
Charges to costs and expenses	7.2
Payouts	(3.7		)
Exchange rate	(0.5		)
Balance, September 27, 2018	$	169.4

21.  Other (Expense) Income, Net

Other (expense) income, net is summarized as follows:

28

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

	For the Three Months Ended						For the Nine Months Ended
	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Kansas Development Finance Authority bond	$	0.8		$	0.6		$	2.9		$	2.3
Rental and miscellaneous income (loss)	0.6			1.6			(0.7		)	0.2
Interest income	2.1			1.9			5.0			4.4
Foreign currency losses	(1.8		)	(1.1		)	(3.3		)	(1.2		)
Loss on sale of accounts receivable	(4.0		)	—			(12.3		)	—
Pension Income	8.6			9.1			25.7			27.6
Gain (loss) on foreign currency forward contract, net of settlement	0.8			—			(20.7		)	—
Gain (loss) on interest rate swaps, net of settlement	0.3			(1.1		)	2.6			(1.1		)
Total	$	7.4		$	11.0		$	(0.8	)	$	32.2

Foreign currency losses are due to the impact of movement in foreign currency exchange rates on an intercompany revolver and long-term contractual rights/obligations, as well as trade and intercompany receivables/payables that are denominated in a currency other than the entity’s functional currency.

22.  Segment Information

The Company operates in three principal segments: Fuselage Systems, Propulsion Systems, and Wing Systems. Revenue from Boeing represents a substantial portion of the Company's revenues in all segments. Wing Systems also includes significant revenues from Airbus. Approximately 95% of the Company's net revenues for the three months ended September 27, 2018, came from the Company's two largest customers, Boeing and Airbus. All other activities fall within the All Other segment, principally made up of sundry sales of miscellaneous services, tooling contracts and sales of natural gas through a tenancy-in-common with other companies that have operations in Wichita, Kansas. The Company's primary profitability measure to review a segment’s operating performance is segment operating income before corporate selling, general and administrative expenses, research and development, and unallocated cost of sales.

Corporate selling, general and administrative expenses include centralized functions such as accounting, treasury, and human resources that are not specifically related to the Company's operating segments and are not allocated in measuring the operating segments’ profitability and performance and net profit margins. Research and development includes research and development efforts that benefit the Company as a whole and are not unique to a specific segment. Unallocated cost of sales includes general costs not directly attributable to segment operations, such as warranty, early retirement and other incentives. All of these items are not specifically related to the Company’s operating segments and are not utilized in measuring the operating segments’ profitability and performance.

The Company’s Fuselage Systems segment includes development, production, and marketing of forward, mid and rear fuselage sections and systems, primarily to aircraft OEMs (OEM refers to aircraft original equipment manufacturer), as well as related spares and maintenance, repairs and overhaul (“MRO”) services.  The Fuselage Systems segment manufactures products at the Company's facilities in Wichita, Kansas and Kinston, North Carolina.  The Fuselage Systems segment also includes an assembly plant for the A350 XWB aircraft in Saint-Nazaire, France.

The Company’s Propulsion Systems segment includes development, production and marketing of struts/pylons, nacelles (including thrust reversers), and related engine structural components primarily to aircraft or engine OEMs, as well as related spares and MRO services.  The Propulsion Systems segment manufactures products at the Company's facility in Wichita, Kansas.

The Company’s Wing Systems segment includes development, production and marketing of wings and wing components (including flight control surfaces), and other miscellaneous structural parts primarily to aircraft OEMs, as well as related spares and MRO services. These activities take place at the Company’s facilities in Tulsa and McAlester, Oklahoma; Kinston, North Carolina; Prestwick, Scotland; and Subang, Malaysia.

29

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

 The Company’s segments are consistent with the organization and responsibilities of management reporting to the chief operating decision-maker for the purpose of assessing performance. The Company’s definition of segment operating income differs from net profit margin as presented in its primary financial statements and a reconciliation of the segment and consolidated results is provided in the table set forth below.

 While some working capital accounts are maintained on a segment basis, much of the Company’s assets are not managed or maintained on a segment basis. Property, plant and equipment, including tooling, is used in the design and production of products for each of the segments and, therefore, is not allocated to any individual segment. In addition, cash, prepaid expenses, other assets and deferred taxes are managed and maintained on a consolidated basis and generally do not pertain to any particular segment. Raw materials and certain component parts are used in aerostructure production across all segments. Work-in-process inventory is identifiable by segment, but is managed and evaluated at the program level. As there is no segmentation of the Company’s productive assets, depreciation expense (included in fixed manufacturing costs and selling, general and administrative expenses) and capital expenditures, no allocation of these amounts has been made solely for purposes of segment disclosure requirements.

The following table shows segment revenues and operating income for the three and nine months ended September 27, 2018, and September 28, 2017:

	Three Months Ended						Nine Months Ended
	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Segment Revenues
Fuselage Systems	$	991.0		$	957.0		$	2,983.4		$	2,812.1
Propulsion Systems	442.4			407.9			1,259.6			1,250.7
Wing Systems	378.6			382.2			1,138.6			1,201.7
All Other	1.7			1.1			5.1			3.9
	$	1,813.7		$	1,748.2		$	5,386.7		$	5,268.4
Segment Operating Income (Loss)
Fuselage Systems (1)	$	134.8		$	143.8		$	417.7		$	205.0
Propulsion Systems (1)	76.2			72.4			203.9			183.4
Wing Systems (1)	58.6			49.1			166.1			134.7
All Other	1.3			0.2			0.3			(0.5		)
	270.9			265.5			788.0			522.6
SG&A	(37.3		)	(49.8		)	(154.5		)	(149.9		)
Impact of severe weather event	—			—			—			(19.9		)
Research and development	(10.8		)	(9.5		)	(31.3		)	(21.2		)
Unallocated cost of sales	(0.3		)	(3.9		)	(2.6		)	(17.0		)
Total operating income	$	222.5		$	202.3		$	599.6		$	314.6

(1) Prior period information has been reclassified as a result of the Company's adoption of ASU 2017-07 on a retrospective basis in 2018. In accordance with the adoption of this guidance, prior year amounts related to the components of net periodic pension and postretirement benefit cost other than service costs have been reclassified from cost of sales and selling, general and administrative expense to other income (expense) within the consolidated statement of operations for all periods presented. Accordingly, expenses of $4.5, $1.8, and $1.8 on the Fuselage, Systems Propulsion Systems, and Wing Systems, respectively, were reclassified into segment operating income for the three months ended September 28, 2017 and expenses of $13.5, $5.5, and $5.5 on the Fuselage Systems, Propulsion Systems, and Wing Systems, respectively, were reclassified into segment operating income for the nine months ended September 28, 2017.

23.  Asco Acquisition

30

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

On May 1, 2018, the Company and its wholly-owned subsidiary Spirit Belgium entered into the Purchase Agreement pursuant to which Spirit Belgium will purchase all of the issued and outstanding equity of Asco, a leading supplier of high lift wing structures, mechanical assemblies and major functional components to major OEMs and Tier I suppliers in the global commercial aerospace and military markets, for the translated amount of $650.0 in cash, subject to certain customary closing adjustments, including foreign currency adjustments. The definitive agreement is subject to customary closing conditions, including regulatory approvals and customer consents.

One of the closing conditions is receipt of clearance from the European Commission (the “Commission”). During the scope of the Commission’s Phase 1 review, the Commission identified issues that it requires to be addressed regarding the transaction. Consequently, on October 26, 2018, the Company withdrew its notification of the transaction from the Commission in order to address those issues. The withdrawal interrupts the Commission’s current review of the transaction. The Company and Asco will work to refile the notification in a timely manner.

Acquisition-related expenses were $14.8 for the nine months ended September 27, 2018 and are included in selling, general and administrative costs on the condensed and consolidated statements of operations.

The foregoing description of the Purchase Agreement does not purport to be complete and is qualified in its entirety by reference to the description set forth in the Company’s Current Report on Form 8-K filed with the SEC on May 2, 2018, and the full text of the Purchase Agreement, which was filed as an exhibit to the Company's Form 10-Q filed with the SEC on August 1, 2018.

24.  Condensed Consolidating Financial Information

The Floating Rate Notes, 2023 Notes, 2026 Notes, and 2028 Notes (collectively, the “Notes”) are fully and unconditionally guaranteed on a senior unsecured basis by Holdings. No subsidiaries are guarantors to any of the Notes.

The following condensed consolidating financial information, which has been prepared in accordance with the requirements for presentation of Rule 3-10(d) of Regulation S-X promulgated under the Securities Act, presents the condensed consolidating financial information separately for:

(i) Holdings, as the parent company and parent guarantor of the Notes, as further detailed in Note 15, Debt;

(ii) Spirit, as the issuer of the Notes;

(iii) The Company’s subsidiaries, (the “Non-Guarantor Subsidiaries”) on a combined basis;

(iv) Consolidating entries and eliminations representing adjustments to (a) eliminate intercompany transactions between or among Holdings and the Non-Guarantor Subsidiaries, (b) eliminate the investments in the Company’s subsidiaries, and (c) record consolidating entries; and

(v) Holdings and its subsidiaries on a consolidated basis.

31

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Condensed Consolidating Statements of Operations

For the Three Months Ended September 27, 2018

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenue	$	—		$	1,636.1		$	305.6		$	(128.0	)	$	1,813.7
Operating costs and expenses
Cost of sales	—			1,395.9			275.2			(128.0		)	1,543.1
Selling, general and administrative	2.3			31.4			3.6			—			37.3
Research and development	—			9.2			1.6			—			10.8
Total operating costs and expenses	2.3			1,436.5			280.4			(128.0		)	1,591.2
Operating (loss) income	(2.3		)	199.6			25.2			—			222.5
Interest expense and financing fee amortization	—			(24.2		)	(1.2		)	1.2			(24.2		)
Other income (expense), net	—			9.6			(1.0		)	(1.2		)	7.4
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(2.3		)	185.0			23.0			—			205.7
Income tax benefit (provision)	0.4			(33.7		)	(3.6		)	—			(36.9		)
(Loss) income before equity in net income of affiliate and subsidiaries	(1.9		)	151.3			19.4			—			168.8
Equity in net income of affiliate	—			—			—			—			—
Equity in net income of subsidiaries	170.7			19.4			—			(190.1		)	—
Net income	168.8			170.7			19.4			(190.1		)	168.8
Other comprehensive (loss) income	(0.6		)	(0.6		)	0.1			0.5			(0.6		)
Comprehensive income (loss)	$	168.2		$	170.1		$	19.5		$	(189.6	)	$	168.2

32

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Condensed Consolidating Statements of Operations

For the Three Months Ended September 28, 2017

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenue	$	—		$	1,573.0		$	311.8		$	(136.6	)	$	1,748.2
Operating costs and expenses
Cost of sales	—			1,339.2			284.0			(136.6		)	1,486.6
Selling, general and administrative	3.9			42.3			3.6			—			49.8
Impact of severe weather event	—			—			—			—			—
Research and development	—			8.8			0.7			—			9.5
Total operating costs and expenses	3.9			1,390.3			288.3			(136.6		)	1,545.9
Operating (loss) income	(3.9		)	182.7			23.5			—			202.3
Interest expense and financing fee amortization	—			(10.5		)	(1.3		)	1.4			(10.4		)
Other income (expense), net	—			13.1			(0.7		)	(1.4		)	11.0
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(3.9		)	185.3			21.5			—			202.9
Income tax benefit (provision)	0.8			(53.0		)	(3.7		)	—			(55.9		)
(Loss) income before equity in net income of affiliate and subsidiaries	(3.1		)	132.3			17.8			—			147.0
Equity in net income of affiliate	0.2			—			0.2			(0.2		)	0.2
Equity in net income of subsidiaries	150.1			17.7			—			(167.8		)	—
Net income	147.2			150.0			18.0			(168.0		)	147.2
Other comprehensive (loss) income	13.8			13.8			14.3			(28.1		)	13.8
Comprehensive income (loss)	$	161.0		$	163.8		$	32.3		$	(196.1	)	$	161.0

33

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Condensed Consolidating Statements of Operations

For the Nine Months EndedSeptember 27, 2018

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net revenues	$	—		$	4,831.3		$	1,017.6		$	(462.2	)	$	5,386.7
Operating costs and expenses
Cost of sales	—			4,147.8			915.7			(462.2		)	4,601.3
Selling, general and administrative	8.0			133.1			13.4			—			154.5
Research and development	—			27.8			3.5			—			31.3
Total operating costs and expenses	8.0			4,308.7			932.6			(462.2		)	4,787.1
Operating (loss) income	(8.0		)	522.6			85.0			—			599.6
Interest expense and financing fee amortization	—			(60.1		)	(4.0		)	3.8			(60.3		)
Other income (expense), net	—			6.6			(3.6		)	(3.8		)	(0.8		)
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(8.0		)	469.1			77.4			—			538.5
Income tax benefit (provision)	1.5			(88.6		)	(12.6		)	—			(99.7		)
(Loss) income before equity in net income of affiliate and subsidiaries	(6.5		)	380.5			64.8			—			438.8
Equity in net income of affiliate	0.6			—			0.6			(0.6		)	0.6
Equity in net income of subsidiaries	445.3			64.8			—			(510.1		)	—
Net income	439.4			445.3			65.4			(510.7		)	439.4
Other comprehensive (loss) income	(16.5		)	(16.5		)	(14.7		)	31.2			(16.5		)
Comprehensive income (loss)	$	422.9		$	428.8		$	50.7		$	(479.5	)	$	422.9

34

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Condensed Consolidating Statements of Operations

For the Nine Months EndedSeptember 28, 2017

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net revenues	$	—		$	4,701.1		$	1,025.4		$	(458.1	)	$	5,268.4
Operating costs and expenses
Cost of sales	—			4,307.4			913.5			(458.1		)	4,762.8
Selling, general and administrative	8.8			130.4			10.7			—			149.9
Impact of severe weather event	—			19.9			—			—			19.9
Research and development	—			19.4			1.8			—			21.2
Total operating costs and expenses	8.8			4,477.1			926.0			(458.1		)	4,953.8
Operating (loss) income	(8.8		)	224.0			99.4			—			314.6
Interest expense and financing fee amortization	—			(30.1		)	(4.5		)	4.5			(30.1		)
Other income (expense), net	—			37.4			(0.7		)	(4.5		)	32.2
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(8.8		)	231.3			94.2			—			316.7
Income tax (provision) benefit	2.7			(70.2		)	(17.4		)	—			(84.9		)
(Loss) income before equity in net income of affiliate and subsidiaries	(6.1		)	161.1			76.8			—			231.8
Equity in net income of affiliate	0.3			—			0.3			(0.3		)	0.3
Equity in net income of subsidiaries	237.9			76.8			—			(314.7		)	—
Net income	232.1			237.9			77.1			(315.0		)	232.1
Other comprehensive (loss) income	33.6			33.6			35.0			(68.6		)	33.6
Comprehensive income (loss)	$	265.7		$	271.5		$	112.1		$	(383.6	)	$	265.7

35

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Condensed Consolidating Balance Sheet

September 27, 2018

	Holdings		Spirit		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets
Cash and cash equivalents	$	—	$	621.5	$	61.9	$	—		$	683.4
Restricted cash	—		0.3		—		—			0.3
Accounts receivable, net	—		730.1		322.7		(367.7		)	685.1
Contract assets, short-term	—		467.7		45.5		—			513.2
Inventory, net	—		610.1		320.9		—			931.0
Other current assets	—		32.4		3.0		—			35.4
Total current assets	—		2,462.1		754.0		(367.7		)	2,848.4
Property, plant and equipment, net	—		1,621.1		501.9		—			2,123.0
Contract assets, long-term	—		53.5		—		—			53.5
Pension assets, net	—		351.3		21.0		—			372.3
Investment in subsidiary	1,116.4		686.5		—		(1,802.9		)	—
Other assets	—		372.8		130.5		(218.4		)	284.9
Total assets	$	1,116.4	$	5,547.3	$	1,407.4	$	(2,389.0	)	$	5,682.1
Liabilities
Accounts payable	$	—	$	837.6	$	412.5	$	(367.7	)	$	882.4
Accrued expenses	—		317.6		36.4		—			354.0
Profit sharing	—		38.4		3.6		—			42.0
Current portion of long-term debt	—		24.1		0.9		—			25.0
Advance payments, short-term	—		112.7		—		—			112.7
Contract liabilities, short-term	—		153.5		—		—			153.5
Forward loss provision, long-term	—		147.3		—		—			147.3
Deferred revenue and other deferred credits, short-term	—		6.6		0.5		—			7.1
Deferred grant income liability - current	—		—		19.4		—			19.4
Other current liabilities	—		68.8		—		—			68.8
Total current liabilities	—		1,706.6		473.3		(367.7		)	1,812.2
Long-term debt	—		1,862.0		125.5		(117.8		)	1,869.7
Advance payments, long-term	—		144.2		2.2		—			146.4
Pension/OPEB obligation	—		38.4		—		—			38.4
Contract liabilities, long-term	—		353.8		—		—			353.8
Forward loss provision, long-term	—		72.6		—		—			72.6
Deferred grant income liability - non-current	—		5.8		24.9		—			30.7
Deferred revenue and other deferred credits	—		24.3		2.5		—			26.8
Other liabilities	—		303.2		12.5		(100.6		)	215.1
Total equity	1,116.4		1,036.4		766.5		(1,802.9		)	1,116.4
Total liabilities and stockholders’ equity	$	1,116.4	$	5,547.3	$	1,407.4	$	(2,389.0	)	$	5,682.1

36

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Condensed Consolidating Balance Sheet

December 31, 2017

	Holdings		Spirit		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets
Cash and cash equivalents	$	—	$	365.1	$	58.2	$	—		$	423.3
Restricted cash	—		2.2		—		—			2.2
Accounts receivable, net	—		752.6		330.9		(361.3		)	722.2
Inventory, net	—		1,010.0		439.9		—			1,449.9
Other current assets	—		50.3		3.2		—			53.5
Total current assets	—		2,180.2		832.2		(361.3		)	2,651.1
Property, plant and equipment, net	—		1,585.8		519.5		—			2,105.3
Pension assets, net	—		327.2		19.9		—			347.1
Investment in subsidiary	1,801.5		704.4		—		(2,505.9		)	—
Other assets	—		298.2		124.5		(258.4		)	164.3
Total assets	$	1,801.5	$	5,095.8	$	1,496.1	$	(3,125.6	)	$	5,267.8
Liabilities
Accounts payable	$	—	$	629.0	$	425.4	$	(361.3	)	$	693.1
Accrued expenses	—		239.5		29.8		—			269.3
Profit sharing	—		103.4		6.1		—			109.5
Current portion of long-term debt	—		30.2		0.9		—			31.1
Advance payments, short-term	—		100.0		—		—			100.0
Deferred revenue and other deferred credits, short-term	—		63.6		1.0		—			64.6
Deferred grant income liability - current	—		—		21.6		—			21.6
Other current liabilities	—		324.3		7.5		—			331.8
Total current liabilities	—		1,490.0		492.3		(361.3		)	1,621.0
Long-term debt	—		1,110.6		167.1		(157.8		)	1,119.9
Advance payments, long-term	—		231.7		—		—			231.7
Pension/OPEB obligation	—		40.8		—		—			40.8
Deferred grant income liability - non-current	—		—		39.3		—			39.3
Deferred revenue and other deferred credits	—		158.2		2.8		—			161.0
Other liabilities	—		343.1		10.1		(100.6		)	252.6
Total equity	1,801.5		1,721.4		784.5		(2,505.9		)	1,801.5
Total liabilities and stockholders’ equity	$	1,801.5	$	5,095.8	$	1,496.1	$	(3,125.6	)	$	5,267.8

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Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Condensed Consolidating Statements of Cash Flows

For the Nine Months EndedSeptember 27, 2018

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments		Total
Operating activities
Net cash provided by operating activities	$	—		$	486.1		$	81.3		$	—	$	567.4
Investing activities
Purchase of property, plant and equipment	—			(142.9		)	(28.0		)	—		(170.9		)
Other	—			2.3			0.5			—		2.8
Net cash used in investing activities	—			(140.6		)	(27.5		)	—		(168.1		)
Financing activities
Proceeds from issuance of bonds	—			1,300.0			—			—		1,300.0
Principal payments of debt	—			(4.3		)	(0.6		)	—		(4.9		)
Payments on term loan	—			(256.3		)				—		(256.3		)
Payments on bonds	—			(300.0		)	—			—		(300.0		)
Proceeds (payments) from intercompany debt	—			49.7			(49.7		)	—		—
Debt issuance and financing costs	—			(23.2		)	—			—		(23.2		)
Taxes paid related to net share settlement of awards	—			(15.5		)	—			—		(15.5		)
Proceeds (payments) from subsidiary for purchase of treasury stock	805.8			(805.8		)	—			—		—
Purchase of treasury stock	(805.8		)	—			—			—		(805.8		)
Proceeds (payments) from subsidiary for dividends paid	35.4			(35.4		)	—			—		—
Dividends Paid	(35.4		)	—			—			—		(35.4		)
Net cash used in financing activities	—			(90.8		)	(50.3		)	—		(141.1		)
Effect of exchange rate changes on cash and cash equivalents	—			—			0.2			—		0.2
Net increase in cash, cash equivalents, and restricted cash for the period	—			254.7			3.7			—		258.4
Cash, cash equivalents, and restricted cash, beginning of period	—			387.3			58.2			—		445.5
Cash, cash equivalents, and restricted cash, end of period	$	—		$	642.0		$	61.9		$	—	$	703.9

38

Spirit AeroSystems Holdings, Inc.

Notes to the Condensed Consolidated Financial Statements (unaudited)

($ in millions other than per share amounts)

Condensed Consolidating Statements of Cash Flows

For the Nine Months EndedSeptember 28, 2017

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments		Total
Operating activities
Net cash provided by operating activities	$	—		$	525.7		$	98.9		$	—	$	624.6
Investing activities
Purchase of property, plant and equipment	—			(122.1		)	(16.6		)	—		(138.7		)
Proceeds from sale of assets	—			0.4			—			—		0.4
Other	—			—			—			—		—
Net cash used in investing activities	—			(121.7		)	(16.6		)	—		(138.3		)
Financing activities
Principal payments of debt	—			(0.7		)	(1.6		)	—		(2.3		)
Payment on term loan	—			(12.5		)	—			—		(12.5		)
Proceeds (payments) from intercompany debt	—			65.1			(65.1		)	—		—
Taxes paid related to net share settlement of awards	—			(13.8		)	—			—		(13.8		)
Debt issuance and financing costs	—			(0.9		)	—			—		(0.9		)
Proceeds from financing under the New Markets Tax Credit Program	—			7.6			—			—		7.6
Proceeds (payments) from subsidiary for purchase of treasury stock	402.1			(402.1		)	—			—		—
Purchase of treasury stock	(402.1		)	—			—			—		(402.1		)
Proceeds (payments) from subsidiary for dividends paid	35.7			(35.7		)	—			—		—
Dividends Paid	(35.7		)	—			—			—		(35.7		)
Net cash used in financing activities	—			(393.0		)	(66.7		)	—		(459.7		)
Effect of exchange rate changes on cash and cash equivalents	—			—			5.6			—		5.6
Net increase in cash, cash equivalents, and restricted cash for the period	—			11.0			21.2			—		32.2
Cash, cash equivalents, and restricted cash, beginning of period	—			700.0			17.6			—		717.6
Cash, cash equivalents, and restricted cash, end of period	$	—		$	711.0		$	38.8		$	—	$	749.8

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

You should read the following discussion of our financial condition and results of operations in conjunction with the unaudited condensed consolidated financial statements and the notes to the unaudited condensed consolidated financial statements appearing elsewhere in this Quarterly Report on Form 10-Q (“Quarterly Report”). The following section may include “forward-looking statements.” Forward-looking statements generally can be identified by the use of forward-looking terminology such as “aim,” “anticipate,” “believe,” “could,” “continue,” “estimate,” “expect,” “goal,” “forecast,” “intend,” “may,” “might,” “objective,” “outlook,” “plan,” “predict,” “project,” “should,” “target,” “will,” “would,” and other similar words, or phrases, or the negative thereof, unless the context requires otherwise. These statements reflect management’s current views with respect to future events and are subject to risks and uncertainties, both known and unknown. Our actual results may vary materially from those anticipated in forward-looking statements. We caution investors not to place undue reliance on any forward-looking statements.

Important factors that could cause actual results to differ materially from those reflected in such forward-looking statements and that should be considered in evaluating our outlook include, but are not limited to, the following:1)  our ability to continue to grow our business and execute our growth strategy, including the timing, execution, and profitability of new and maturing programs; 2)  our ability to perform our obligations under our new and maturing commercial, business aircraft, and military development programs, and the related recurring production; 3) our ability to accurately estimate and manage performance, cost, and revenue under our contracts, including our ability to achieve certain cost reductions with respect to the B787 program; 4) margin pressures and the potential for additional forward losses on new and maturing programs; 5)  our ability and our suppliers’ ability to accommodate, and the cost of accommodating, announced increases in the build rates of certain aircraft and expanding model mixes; 6) the effect on aircraft demand and build rates of changing customer preferences for business aircraft, including the effect of global economic conditions on the business aircraft market and expanding conflicts or political unrest; 7) customer cancellations or deferrals as a result of global economic uncertainty or otherwise; 8) the effect of economic conditions in the industries and markets in which we operate in the U.S. and globally and any changes therein, including fluctuations in foreign currency exchange rates; 9) the success and timely execution of key milestones such as the receipt of necessary regulatory approvals, including our ability to obtain in a timely fashion any required regulatory or other third party approvals for the consummation of our announced acquisition of Asco, and customer adherence to their announced schedules; 10) our ability to successfully negotiate, or re-negotiate, future pricing under our supply agreements with Boeing and our other customers; 11) our ability to enter into profitable supply arrangements with additional customers; 12) the ability of all parties to satisfy their performance requirements, including our ability to timely deliver quality products, under existing supply contracts with our two major customers, Boeing and Airbus, and other customers, and the risk of nonpayment by such customers; 13) any adverse impact on Boeing’s and Airbus’ production of aircraft resulting from cancellations, deferrals, or reduced orders by their customers or from labor disputes, domestic or international hostilities, or acts of terrorism; 14) any adverse impact on the demand for air travel or our operations from the outbreak of diseases or epidemic or pandemic outbreaks; 15) our ability to avoid or recover from cyber-based or other security attacks, information technology failures, or other disruptions; 16) returns on pension plan assets and the impact of future discount rate changes on pension obligations; 17) our ability to borrow additional funds or refinance debt, including our ability to obtain the debt to finance the purchase price for our announced acquisition of Asco on favorable terms or at all; 18) competition from or in-sourcing by commercial aerospace original equipment manufacturers and competition from other aerostructures suppliers; 19) the effect of governmental laws, such as U.S. export control laws and U.S. and foreign anti-bribery laws such as the Foreign Corrupt Practices Act and the United Kingdom Bribery Act, and environmental laws and agency regulations, both in the U.S. and abroad; 20) the effect of changes in tax law, such as the effect of The Tax Cuts and Jobs Act that was enacted on December 22, 2017, and changes to the interpretations of or guidance related thereto, and the Company’s ability to accurately calculate and estimate the effect of such changes; 21) any reduction in our credit ratings; 22) our dependence on our suppliers, as well as the cost and availability of raw materials and purchased components; 23) our ability to recruit and retain a critical mass of highly-skilled employees and our relationships with the unions representing many of our employees; 24) spending by the U.S. and other governments on defense; 25) the possibility that our cash flows and our credit facility may not be adequate for our additional capital needs or for payment of interest on, and principal of, our indebtedness; 26) our exposure under our revolving credit facility to higher interest payments should interest rates increase substantially; 27) the effectiveness of any interest rate hedging programs; 28) the effectiveness of our internal control over financial reporting; 29) the outcome or impact of ongoing or future litigation, claims, and regulatory actions; 30) exposure to potential product liability and warranty claims; 31) our ability to effectively assess, manage and integrate acquisitions that we pursue, including our ability to successfully integrate the Asco business and generate synergies and other cost savings; 32) the consummation of our announced acquisition of Asco while avoiding any unexpected costs, charges, expenses, adverse changes to business relationships and other business disruptions for ourselves and Asco as a result of the acquisition; 33) our ability to continue selling certain receivables through our supplier financing program; 34) the risks of doing business internationally, including fluctuations in foreign current exchange rates, impositions of tariffs or embargoes, trade restrictions, compliance with foreign laws, and domestic and foreign government policies; and 35) our ability to complete the accelerated stock repurchase plan, among other things.

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These factors are not exhaustive and it is not possible for us to predict all factors that could cause actual results to differ materially from those reflected in our forward-looking statements. These factors speak only as of the date hereof, and new factors may emerge or changes to the foregoing factors may occur that could impact our business. As with any projection or forecast, these statements are inherently susceptible to uncertainty and changes in circumstances. Except to the extent required by law, we undertake no obligation to, and expressly disclaim any obligation to, publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. You should review carefully the section captioned “Risk Factors” in the Company’s 2017 Form 10-K and the Company's Quarterly Report on Form 10-Q for the first quarter of 2018 for a more complete discussion of these and other factors that may affect our business.

Management’s Focus

The Company's focus in 2018 continues to revolve around our operational execution, with a focus on safety and quality while working to meet our customers' requirements for production rate changes. Additionally, we are focusing on positioning ourselves for organic and inorganic growth within the commercial, defense, and fabrication markets. Considering the strong demand for commercial aircraft for the foreseeable future, all of these markets offer possibilities for growth. To help support our work on production rate increases and market growth, we continue to focus on attracting, developing, and retaining a world-class team at our sites and being a trusted partner to our customers and suppliers.

Programs

B737 Program

The B737 program has been steadily increasing in rate due to increased demand, and will continue to do so for the remainder of 2018. As we are working to meet this increased demand, we have experienced supplier disruptions, challenges relating to model mix changes from the B737 NG to B737 MAX, and other challenges that have resulted in additional production costs including overtime, expedited freight, and surge resources. In response to these disruptions, we implemented a comprehensive recovery plan in the first half of 2018 to eliminate the current operational challenges and help mitigate future challenges. With this recovery plan in place, we made great efforts during the second and third quarters to recover to our planned production schedule and we are fully recovered to our delivery schedule. Additional efforts will be ongoing to address these challenges on a go-forward basis. As a result of our efforts to recover to delivery schedule, we continue to incur additional expenses that are reflected in our third quarter financial results. We expect these additional costs to continue to reduce during the remainder of 2018.

B787 Program

As we continue on the B787 program, our performance depends on our continued ability to achieve cost reductions in our manufacturing and support labor and supply chain. During the first nine months of 2018, we recorded additional net forward loss reserves of $2.3 million on the B787 program due to the adoption of ASU 2017-07, partially offset by favorable performance on cost initiatives.

We have agreed to price reductions for future units and we expect to continue to reduce costs in the future. If we are unable to continue to reduce our costs on the B787 program while successfully executing future rate increases, we may record additional forward loss reserves.

A350 XWB - Fuselage Program

As previously disclosed, our A350 XWB fuselage recurring program is continuing to increase production rates to meet customer needs. To prepare for increased production rates, we are investing in additional labor and capital and continue to focus on gaining additional production efficiencies. We are reliant on this increase in capital and efficiency to achieve the planned production rates and to reduce our use of air freight and other costs.

Results of Operations

The following table sets forth, for the periods indicated, certain of our operating data:

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	Three Months Ended						Nine Months Ended
	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
	($ in millions)						($ in millions)
Revenue	$	1,813.7		$	1,748.2		$	5,386.7		$	5,268.4
Cost of sales	1,543.1			1,486.6			4,601.3			4,762.8
Gross profit	270.6			261.6			785.4			505.6
Selling, general and administrative	37.3			49.8			154.5			149.9
Impact of severe weather event	—			—			—			19.9
Research and development	10.8			9.5			31.3			21.2
Operating income	222.5			202.3			599.6			314.6
Interest expense and financing fee amortization	(24.2		)	(10.4		)	(60.3		)	(30.1		)
Other (expense) income, net	7.4			11.0			(0.8		)	32.2
Income before income taxes and equity in net income of affiliate	205.7			202.9			538.5			316.7
Income tax provision	(36.9		)	(55.9		)	(99.7		)	(84.9		)
Income before equity in net income of affiliate	168.8			147.0			438.8			231.8
Equity in net income of affiliate	—			0.2			0.6			0.3
Net income	$	168.8		$	147.2		$	439.4		$	232.1

Comparative shipset deliveries by model are as follows: 

	Three Months Ended		Nine Months Ended
Model	September 27, 2018	September 28, 2017	September 27, 2018	September 28, 2017
B737	160	137	457	399
B747	1	1	4	4
B767	8	8	23	21
B777	11	15	32	55
B787	33	37	108	105
Total Boeing	213	198	624	584
A220 (1)	6	0	6	0
A320 Family	165	146	488	452
A330/340	13	21	46	60
A350 XWB	19	18	71	65
A380	1	2	4	10
Total Airbus	204	187	615	587
Business/Regional Jets (1)	14	19	56	67
Total	431	404	1,295	1,238

⁽¹⁾ Airbus acquired majority ownership in the C-Series program (subsequently renamed as the A220 program) in July 2018; all C-Series deliveries prior to the third quarter of 2018 are included in Business/Regional Jets and all A220 deliveries subsequent to the acquisition are included in A220.

For purposes of measuring production or shipset deliveries for Boeing aircraft in a given period, the term “shipset” refers to sets of structural fuselage components produced or delivered for one aircraft in such period. For purposes of measuring production or shipset deliveries for Airbus and Business/Regional Jet aircraft in a given period, the term “shipset” refers to all structural aircraft components produced or delivered for one aircraft in such period. For the purposes of measuring wing shipset deliveries, the term “shipset” refers to all wing components produced or delivered for one aircraft in such period. Other components that are part of

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the same aircraft shipsets could be produced or shipped in earlier or later accounting periods than the components used to measure production or shipset deliveries, which may result in slight variations in production or delivery quantities of the various shipset components in any given period.

Net revenues by prime customer are as follows: 

	Three Months Ended				Nine Months Ended
Prime Customer	September 27, 2018		September 28, 2017		September 27, 2018		September 28, 2017
	($ in millions)				($ in millions)
Boeing	$	1,465.5	$	1,418.8	$	4,262.2	$	4,172.7
Airbus	263.8		257.4		869.0		853.8
Other	84.4		72.0		255.5		241.9
Total net revenues	$	1,813.7	$	1,748.2	$	5,386.7	$	5,268.4

Changes in Estimates

During the third quarter of 2018, we recognized total changes in estimates of $(13.5) million, which included net forward loss charges of $(0.5) million, and unfavorable cumulative catch-up adjustments related to periods prior to the third quarter of 2018 of $(13.0) million. During the same period in the prior year, we recognized total changes in estimates of $(4.8) million, which included net forward loss charges of $(2.0) million and unfavorable cumulative catch-up adjustments related to periods prior to the third quarter of 2017 of $(2.8) million.

Three Months Ended September 27, 2018 as Compared to Three Months Ended September 28, 2017

Revenue.  Revenues for the three months ended September 27, 2018 were $1,813.7 million, an increase of $65.5 million, or 4%, compared to net revenues of $1,748.2 million for the same period in the prior year. Higher revenues were recorded for the Fuselage Systems and Propulsion Systems segments and lower revenues were recorded for the Wing Systems segment during the third quarter of 2018 compared to the same period in the prior year. The increase in revenues was primarily due to increased production on the B737 and A320 programs and increased defense related work, partially offset by decreased production on the B777 program, lower revenues recognized on the B787 program due to the adoption of ASC 606, and lower revenue recognized on the A350 XWB program in accordance with pricing terms. Approximately 95% of net revenues for the third quarter of 2018 came from our two largest customers, Boeing and Airbus.

Total production deliveries to Boeing increased to 213 shipsets during the third quarter of 2018, compared to 198 shipsets delivered in the same period of the prior year, primarily driven by increased deliveries on the B737 program, partially offset by decreased production deliveries on the B777 and B787 programs. Total production deliveries to Airbus increased to 204 shipsets during the third quarter of 2018, compared to 187 shipsets delivered in the same period of the prior year, primarily driven by higher production of the A320 program and the transfer of the A220 programs to total Airbus deliveries in the third quarter of 2018, partially offset by lower A330 deliveries. Total production deliveries of business/regional jet wing and wing components decreased to 14 shipsets during the third quarter of 2018, compared to 19 shipsets delivered in the same period of the prior year, driven by the transfer of the A220 programs to total Airbus deliveries in the third quarter of 2018. In total, production deliveries increased to 431 shipsets during the third quarter of 2018, compared to 404 shipsets delivered in the same period of the prior year.

Gross Profit.  Gross profit was $270.6 million for the three months ended September 27, 2018, as compared to $261.6 million for the same period in the prior year. The slight increase was driven by increased margins recognized on the A350 program due to the adoption of ASC 606, partially offset by decreased margins recognized on the B737 and B777 programs.

SG&A and Research and Development.  SG&A expense was $12.5 million lower for the three months ended September 27, 2018, compared to the same period in the prior year, primarily due to the recovery of legal fees related to a court decision, partially offset by costs incurred related to the anticipated purchase of Asco. Research and development expense was $1.3 million higher for the three months ended September 27, 2018, compared to the same period in the prior year.

Operating Income.  Operating income for the three months ended September 27, 2018 was $222.5 million, an increase of $20.2 million, or 10% compared to an operating income of $202.3 million for the same period in the prior year.

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Interest Expense and Financing Fee Amortization.  Interest expense and financing fee amortization for the three months ended September 27, 2018 was $24.2 million, compared to $10.4 million for the same period in the prior year. Interest expense and financing fee amortization during the third quarter of 2018 included $16.5 million of interest and fees paid or accrued in connection with long-term debt and $6.2 million in amortization of deferred financing costs and original issue discount, compared to $9.0 million of interest and fees paid or accrued in connection with long-term debt and $0.9 million in amortization of deferred financing costs and original issue discount for the same period in the prior year. During the third quarter of 2018, we redeemed the remaining 2022 Notes that had not been tendered in our second quarter tender offer and replaced our prior credit agreement with the 2018 Credit Agreement. As a result, we recognized a loss on extinguishment of existing bonds and revolver of $5.4 million.

Other Income, net. Other income, net for the three months ended September 27, 2018 was $7.4 million, compared to $11.0 million for the same period in the prior year. This decrease was primarily driven by net losses taken on the sale of receivables in 2018.

Provision for Income Taxes. Our reported tax rate includes two principal components: an expected annual tax rate and discrete items resulting in additional provisions or benefits that are recorded in the quarter that an event arises. Events or items that could give rise to discrete recognition include excess tax benefit in respect of share-based compensation, finalizing audit examinations for open tax years, statute of limitations expiration, or a change in tax law.

The income tax provision for the three months ended September 27, 2018 includes $35.3 million for federal taxes, ($1.5) million for state taxes and $3.1 million for foreign taxes. The income tax provision for the three months ended September 28, 2017 includes $52.8 million for federal taxes, $0.4 million for state taxes, and $2.7 million for foreign taxes. The effective tax rate for the three months ended September 27, 2018 was 17.9% as compared to 27.5% for the same period in 2017. The difference in the effective tax rate recorded for 2018 as compared to 2017 is related primarily to the enactment of the TCJA, including the reduction in the U.S. corporate federal income tax rate from 35% to 21%, estimated GILTI tax provisions, the elimination of the domestic manufacturing deduction, and the decrease to our one-time transition tax liability, and unrelated to the TCJA, higher state tax credits generated in 2018. The decrease from the U.S. statutory tax rate is attributable primarily to the generation of state income tax and federal research tax credits, the decrease to our provisional one-time transition tax liability, and foreign tax rates lower than the U.S. rate, offset by estimated GILTI tax provisions. For additional information on the TCJA and GILTI tax, please see Note 18, Income Taxes, to our condensed consolidated financial statements included in Part I of this Quarterly Report.

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Segments.  The following table shows segment revenues and operating income for the three months ended September 27, 2018 and September 28, 2017:

	Three Months Ended
	September 27, 2018			September 28, 2017
	($ in millions)
Segment Revenues
Fuselage Systems	$	991.0		$	957.0
Propulsion Systems	442.4			407.9
Wing Systems	378.6			382.2
All Other	1.7			1.1
	$	1,813.7		$	1,748.2
Segment Operating Income
Fuselage Systems (1)	$	134.8		$	143.8
Propulsion Systems (1)	76.2			72.4
Wing Systems (1)	58.6			49.1
All Other	1.3			0.2
	270.9			265.5
SG&A (1)	(37.3		)	(49.8		)
Impact of severe weather event	—			—
Research and development	(10.8		)	(9.5		)
Unallocated cost of sales(2)	(0.3		)	(3.9		)
Total operating (loss) income	$	222.5		$	202.3

(1) Prior period information has been reclassified as a result of the Company's adoption of ASU 2017-07 on a retrospective basis in 2018. In accordance with the adoption of this guidance, prior year amounts related to the components of net periodic pension and postretirement benefit cost other than service costs have been reclassified from cost of goods sold and selling, general and administrative expense to other income (expense) within the consolidated statement of operations for all periods presented. Accordingly, expenses of $4.5 million, $1.8 million, and $1.8 million attributable to the Fuselage Systems segment, Propulsion Systems segment, and Wing Systems segment, respectively, were reclassified into segment operating income for the three months ended September 28, 2017 and $1.0 million of expense was reclassified to SG&A.

(2) Includes $0.9 million and $1.5 million of warranty expense for the three months ended September 27, 2018 and September 28, 2017 respectively.

Fuselage Systems, Propulsion Systems, Wing Systems, and All Other represented approximately 55%, 24%, 21%, and less than 1%, respectively, of our net revenues for the three months ended September 27, 2018.

Fuselage Systems.  Fuselage Systems segment net revenues for the three months ended September 27, 2018, were $991.0 million, an increase of $34.0 million, or 4%, compared to the same period in the prior year. The increase was primarily due to increased production work on the B737 program, increased defense related activity, and increased production on certain non-recurring programs, partially offset by decreased production on the B777 program and lower revenues recognized on the B787 program due to the adoption of ASC 606. Fuselage Systems segment operating margins were 14% for the three month period ended September 27, 2018, compared to 15% for the same period in the prior year, primarily due to lower margins recognized on the B737 and B777 programs, partially offset by increased margins recorded on the A350 XWB program due to the adoption of ASC 606 and decreased revenue from lower margin programs. In the third quarter of 2018, the segment recorded unfavorable cumulative catch-up adjustments of $12.0 million. In comparison, during the third quarter of 2017, the segment recorded unfavorable cumulative catch-up adjustments of $2.4 million and net forward loss charges of $0.9 million.

Propulsion Systems.  Propulsion Systems segment net revenues for the three months ended September 27, 2018 were $442.4 million, an increase of $34.5 million, or 8%, compared to the same period in the prior year. The increase was primarily due to increased production work on the B737 program, partially offset by lower production work on the B777, decreased activity on

45

certain non-recurring programs, and lower revenues recognized on the B787 program due to the adoption of ASC 606. Propulsion Systems segment operating margins were 17% for the three month period ended September 27, 2018, compared to 18% for the same period in the prior year, primarily due to unfavorable cumulative catch-up adjustments recognized in the current quarter. The segment recorded unfavorable cumulative catch-up adjustments of $2.4 million and net forward loss charges of $0.8 million for the three months ended September 27, 2018. In comparison, during the same period of the prior year, the segment recorded favorable cumulative catch-up adjustments of $2.4 million and favorable changes in estimates on loss programs of $1.3 million.

Wing Systems.  Wing Systems segment net revenues for the three months ended September 27, 2018 were $378.6 million, a decrease of $3.6 million, or 1%, compared to the same period in the prior year. The decrease was primarily due to lower revenue recognized on the A350 XWB program in accordance with pricing terms and lower revenues recognized on the B787 program due to the adoption of ASC 606, partially offset by increased production on the B737 and A320 programs. Wing Systems segment operating margins were 15% for the three months ended September 27, 2018, compared to 13% for the same period in the prior year. This increase was primarily driven by increased margins recorded on the A350 XWB program due to the adoption of ASC 606 and decreased revenue from lower margin programs, partially offset by decreased margins recognized on the B737 program. In the third quarter of 2018, the segment recorded favorable changes in estimates on loss programs of $0.3 million and favorable cumulative catch-up adjustments of $1.4 million. In comparison, during the third quarter of 2017, the segment recorded net forward loss charges of $2.4 million as well as unfavorable cumulative catch-up adjustments of $2.8 million.

All Other.  All Other segment net revenues consist of sundry sales of miscellaneous services, tooling contracts, and natural gas revenues from KIESC. In the three months ended September 27, 2018, All Other segment net revenues were $1.7 million, an increase of $0.6 million compared to the same period in the prior year.

Nine Months Ended September 27, 2018 as Compared to Nine Months Ended September 28, 2017

Net Revenues.  Net revenues for the nine months ended September 27, 2018 were $5,386.7 million, an increase of $118.3 million, or 2%, compared to net revenues of $5,268.4 million for the same period in the prior year. Higher revenues were recorded for the Fuselage Systems and Propulsion Systems segments and lower revenues were recorded for the Wing Systems segment during the first nine months of 2018 as compared to the same period in the prior year. The increase in net revenues was primarily due to higher production work on the B737, B787, A350 XWB, and A320 programs and increased defense related activities, partially offset by lower production deliveries of the B777 program, lower revenues recognized on the B787 program due to the adoption of ASC 606, and the absence of a litigation reserve reversed in the second quarter of 2017. Approximately 95% of net revenues for the first nine months of 2018 came from our two largest customers, Boeing and Airbus.

Production deliveries to Boeing increased to 624 shipsets during the first nine months of 2018, compared to 584 shipsets delivered in the same period of the prior year, primarily driven by increased production on the B737 program, partially offset by decreased production of the B777 program. Production deliveries to Airbus increased to 615 shipsets during the first nine months of 2018, compared to 587 shipsets delivered in the same period of the prior year, primarily driven by higher production of the A320 and A350 XWB programs, partially offset by lower A330 deliveries. Production deliveries of business/regional jet wing and wing components decreased to 56 shipsets during the first nine months of 2018, compared to 67 shipsets delivered in the same period of the prior year. In total, production deliveries increased by 5% to 1,295 shipsets during the first nine months of 2018, compared to 1,238 shipsets delivered in the same period of the prior year.

Gross Profit.  Gross profit was $785.3 million, or 15%, for the nine months ended September 27, 2018, as compared to $505.6 million, or 10%, for the same period in the prior year. The increase in gross profit was primarily driven by the absence of the $352.8 million reach-forward loss recorded on the B787 program in the second quarter of 2017, partially offset by decreased production on the B777 program and lower margins recognized on the B737 program.

SG&A and Research and Development.  SG&A expense was $4.6 million higher for the nine months ended September 27, 2018, compared to the same period in the prior year primarily due to costs incurred related to the anticipated purchase of Asco, partially offset by the recovery of legal fees related to a court decision. Research and development expense was $10.1 million higher for the nine months ended September 27, 2018, compared to the same period in the prior year primarily due to more internal projects underway.

Impact of Severe Weather Event.  For the nine months ended September 28, 2017, the Company recorded a $19.9 million charge against operating income related to the aftermath of Hurricane Matthew, which caused the Company's Kinston, North Carolina site operations to temporarily shut down in the fourth quarter of 2016.

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Operating Income.  Operating income for the nine months ended September 27, 2018 was $599.6 million, an increase of $285.0 million, or 91%, compared to operating income of $314.6 million for the same period in the prior year. The increase in operating income was primarily due to the absence of net forward loss charges on the B787 program recorded in the second quarter of 2017, contributions to gross profit from the adoption of ASC 606, and the absence of expenses related to the severe weather event, partially offset by decreased production on the B777 program, lower margins recognized on the B737 program, and expenses related to the purchase of Asco.

Interest Expense and Financing Fee Amortization.  Interest expense and financing fee amortization for the nine months ended September 27, 2018 was $60.3 million, compared to $30.1 million for the same period in the prior year. Interest expense and financing fee amortization for the nine months ended September 27, 2018 included $37.9 million of interest and fees paid or accrued in connection with long-term debt and $17.6 million in amortization of deferred financing costs and original issue discount, compared to $27.0 million of interest and fees paid or accrued in connection with long-term debt and $2.6 million in amortization of deferred financing costs and original issue discount for the same period in the prior year. During the second and third quarters of 2018, we extinguished our $300.0 million 2022 Notes through a tender offer and redemption and we replaced our prior credit agreement with the 2018 Credit Agreement. As a result, we recognized a loss on extinguishment of existing debt of $14.4 million.

Other (Expense) Income, net. Other expense, net for the nine months ended September 27, 2018 was $0.8 million, compared to Other income, net of $32.2 million for the same period in the prior year. Other expense, net during 2018 was primarily driven by losses on foreign currency forward contracts as the U.S. Dollar strengthened against the Euro and net losses on sales of receivables, partially offset by pension income.

Provision for Income Taxes. Our reported tax rate includes two principal components: an expected annual tax rate and discrete items resulting in additional provisions or benefits that are recorded in the quarter that an event arises. Events or items that could give rise to discrete recognition could include excess tax benefits in respect of share-based compensation, finalizing audit examinations for open tax years, statute of limitations expiration, or a change in tax law.

The income tax provision for the nine months ended September 27, 2018 includes $89.2 million for federal taxes, ($0.1) million for state taxes, and $10.6 million for foreign taxes. The income tax provision for the nine months ended September 28, 2017 includes $69.8 million for federal taxes, $0.9 million for state taxes, and $14.2 million for foreign taxes. The effective tax rate for the nine months ended September 27, 2018 was 18.5% as compared to 26.8% in 2017. The difference in the effective tax rate recorded for 2018 as compared to 2017 is related primarily to the enactment of the TCJA, including the reduction in the U.S. corporate federal income tax rate from 35% to 21% and the elimination of the domestic manufacturing deduction, and unrelated to the TCJA, higher state tax credits generated in 2018 offset by the proportional tax rate effects of lower pre-tax income in 2017. The decrease from the U.S. statutory tax rate is attributable primarily to the generation of state income tax and federal research tax credits, share based compensation excess tax benefit, foreign tax rates lower than the U.S. rate, and the decrease to our provisional one-time transition tax liability, offset by estimated GILTI tax provisions. For additional information on the TCJA and GILTI tax, please see Note 18, Income Taxes, to our condensed consolidated financial statements included in Part I of this Quarterly Report.

47

Segments.  The following table shows segment revenues and operating income for the nine months ended September 27, 2018 and September 28, 2017:

	Nine Months Ended
	September 27, 2018			September 28, 2017
	($ in millions)
Segment Revenues
Fuselage Systems	$	2,983.4		$	2,812.1
Propulsion Systems	1,259.6			1,250.7
Wing Systems	1,138.6			1,201.7
All Other	5.1			3.9
	$	5,386.7		$	5,268.4
Segment Operating Income
Fuselage Systems(1)	$	417.7		$	205.0
Propulsion Systems(1)	203.9			183.4
Wing Systems(1)	166.1			134.7
All Other	0.2			(0.5		)
	787.9			522.6
Corporate SG&A (1)	(154.5		)	(149.9		)
Impact of severe weather event	—			(19.9		)
Research and development	(31.3		)	(21.2		)
Unallocated cost of sales(2)	(2.5		)	(17.0		)
Total operating income	$	599.6		$	314.6

(1) Prior period information has been reclassified as a result of the Company's adoption of ASU 2017-07 on a retrospective basis in 2018. In accordance with the adoption of this guidance, prior year amounts related to the components of net periodic pension and postretirement benefit cost other than service costs have been reclassified from cost of sales and selling, general and administrative expense to other income (expense) within the consolidated statement of operations for all periods presented. Accordingly, expenses of $13.5 million, $5.5 million, and $5.5 million attributable to the Fuselage Systems segment, Propulsion Systems segment, and Wing Systems segment, respectively, were reclassified into segment operating income for the nine months ended September 28, 2017 and $3.1 million of expense was reclassified to SG&A.

(2) Includes $2.0 million and $3.2 million of warranty expense for the nine months ended September 27, 2018 and September 28, 2017, respectively. Also includes a charge for excess purchases and purchase commitments of $10.6 million for the nine months ended September 28, 2017.

Fuselage Systems.  Fuselage Systems segment net revenues for the nine months ended September 27, 2018 were $2,983.4 million, an increase of $171.3 million, or 6%, compared to the same period in the prior year. The increase was primarily due to increased production on the B737, B787, and A350 XWB programs, increased defense related activities, and higher revenue recognized on certain non-recurring Boeing programs, partially offset by decreased production on the B777 program, lower revenue recognized on the B787 program due to the adoption of ASC 606, and lower revenue recognized on the A350 XWB program in accordance with pricing terms. Fuselage Systems segment operating margins were 14% for the nine months ended September 27, 2018, compared to 7% for the same period in the prior year. The increase was primarily driven by the absence of a $230.5 million reach-forward loss on the B787 program recognized in 2017 and increased margins recognized on the A350 XWB program due to the adoption of ASC 606, partially offset by decreased margins on the B737 and B777 programs. In the first nine months of 2018, the segment recorded net forward loss charges of $1.5 million and unfavorable cumulative catch-up adjustments of $3.0 million. In comparison, during the first nine months of 2017, the segment recorded net forward loss charges of $238.5 million and favorable cumulative catch-up adjustments of $5.3 million.

Propulsion Systems.  Propulsion Systems segment net revenues for the nine months ended September 27, 2018 were $1,259.6 million, an increase of $8.9 million, or 1%, compared to the same period in the prior year. The increase was primarily due to

48

increased production on the B737 program, partially offset by decreased production on the B777 program, lower revenues recognized on certain non-recurring Boeing programs, and lower revenue recognized on the B787 program due to the adoption of ASC 606. Propulsion Systems segment operating margins were 16% for the nine months ended September 27, 2018, compared to 15% for the same period in the prior year. The increase in margins was primarily driven by the absence of a $48.3 million reach-forward loss charge on the B787 program recorded in 2017. During the first nine months of 2018, the segment recorded favorable cumulative catch-up adjustments of $0.9 million. In comparison, during the first nine of 2017, the segment recorded $46.7 million of net forward loss charges and favorable cumulative catch-up adjustments of $4.3 million.

Wing Systems.  Wing Systems segment net revenues for the nine months ended September 27, 2018 were $1,138.6 million, a decrease of $63.1 million, or 5%, compared to the same period in the prior year. The decrease was primarily due to decreased production on the B777 program, lower revenues recognized on the B787 programs due to the adoption of ASC 606, and lower revenue recognized on the A350 XWB program in accordance with pricing terms, partially offset by increased production on the B737 and A320 programs. Wing Systems segment operating margins were 15% for the nine months ended September 27, 2018, compared to 11% for the same period in the prior year, driven primarily by the absence of a $74.0 million reach-forward loss charge recognized on the B787 program in 2017. In the first nine months of 2018, the segment recorded favorable cumulative catch-up adjustments of $0.9 million as well as net forward loss charges of $0.2 million. In comparison, during the first nine months of 2017, the segment recorded net forward loss charges of $74.4 million and favorable cumulative catch-up adjustments of $19.1 million.

All Other.  All Other segment net revenues consist of sundry sales of miscellaneous services, tooling contracts and natural gas revenues from KIESC. In the nine months ended September 27, 2018, All Other segment net revenues were $5.1 million, an increase of $1.2 million compared to the same period in the prior year. The All Other segment recorded 4% operating margins for the nine months ended September 27, 2018.

Liquidity and Capital Resources

We assess our liquidity in terms of our ability to generate cash to fund our operating, investing, and financing activities. Our principal source of liquidity is operating cash flows from continuing operations. We expend significant capital as we undertake new programs, meet increased production rates on certain mature and maturing programs, and develop new technologies for the next generation of aircraft, which may not be funded by our customers. In addition, other significant factors that affect our overall management of liquidity include: debt service, redemptions of debt, the ability to attract long-term capital at satisfactory terms, research and development, significant claims, litigation, or contingencies, capital expenditures, share repurchases, dividend payments, and merger and acquisition activities. As described above, we have entered into the Purchase Agreement with respect to the acquisition of Asco for $650.0 million. Further, in May 2018, the Company entered into the ASRs to repurchase in total $725.0 million of the Company’s class A common stock. We funded the ASR and will fund the acquisition of Asco through debt issuances executed during the second and third quarters of 2018, as well as through our 2018 Credit Agreement.

As of September 27, 2018, we had $683.4 million of cash and cash equivalents on the balance sheet. In addition, we currently have $800.0 million of available borrowing capacity under our 2018 Revolver. There were no borrowings or outstanding balances under our 2018 Revolver as of September 27, 2018.

After repurchases made under the ASR, the Company had approximately $200 million remaining in its share repurchase program. On October 24, 2018, the Board of Directors approved an increase to its existing share repurchase program of approximately $800 million, resulting in a total program authorization of $1.0 billion.

We believe our future operating cash flows will be sufficient to meet our future operating cash needs. Further, we believe that our access to the 2018 Credit Agreement, and ability to obtain debt financing provides additional potential sources of liquidity as required or appropriate.

Cash Flows

The following table provides a summary of our cash flows for the nine months ended September 27, 2018 and September 28, 2017:

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	For the nine months ended
	September 27, 2018			September 28, 2017
	($ in millions)
Net cash provided by operating activities	$	567.4		$	624.6
Net cash used in investing activities	(168.1		)	(138.3		)
Net cash used in financing activities	(141.1		)	(459.7		)
Effect of exchange rate change on cash and cash equivalents	0.2			5.6
Net increase in cash, cash equivalents and restricted cash for the period	258.4			32.2
Cash, cash equivalents, and restricted cash beginning of period	445.5			717.6
Cash, cash equivalents, and restricted cash, end of period	$	703.9		$	749.8

Nine Months Ended September 27, 2018 as Compared to Nine Months Ended September 28, 2017

Operating Activities. For the nine months ended September 27, 2018, we had a net cash inflow of $567.4 million from operating activities, a decrease of $57.2 million compared to a net cash inflow of $624.6 million for the same period in the prior year. The decrease in net cash provided by operating activities was primarily due to lower repayment of customer advances, partially offset by higher payments of annual employee bonuses.

Investing Activities. For the nine months ended September 27, 2018, we had a net cash outflow of $168.1 million for investing activities, an increase in outflow of $29.8 million compared to a net cash outflow of $138.3 million for the same period in the prior year. The increase in cash outflow is due to an increase in capital expenditures during the first nine months of 2018.

Financing Activities. For the nine months ended September, 2018, we had a net cash outflow of $141.1 million for financing activities, a decrease in outflow of $318.6 million, compared to a net cash outflow of $459.7 million for the same period in the prior year. The decrease in net cash outflow is primarily due to the issuance of senior notes entered into during the second quarter 2018, which resulted in $1,300.0 million proceeds from the issuance of debt, partially offset by $584.3 million payments on debt and debt issuance and financing costs. During the nine months ended September 27, 2018, the Company repurchased 8,157,287 shares of its class A common stock for $805.8 million, compared to 6,337,741 shares repurchased for $402.1 million during the same period in the prior year. Additionally, during the nine months ended September 27, 2018, the Company paid dividends of $35.4 million to its stockholders of record, compared to dividends of $35.7 million paid in the same period in the prior year.

Pension and Other Post-Retirement Benefit Obligations

Our U.S. pension plan remained fully funded at September 27, 2018 and we anticipate non-cash pension income for 2018 to remain at or near the same level as 2017. Our plan investments are broadly diversified and we do not anticipate a near-term requirement to make cash contributions to our U.S. pension plan. See Note 16, Pension and Other Post-Retirement Benefits, for more information on the Company’s pension plans.

Interest Rate Swaps

On March 15, 2017, the Company entered into an interest rate swap agreement, with an effective date of March 31, 2017. The swaps have a notional value of $250.0 million and fix the variable portion of the Company’s floating rate debt at 1.815%. The fair value of the interest rate swaps was an asset of $3.5 million as of September 27, 2018. For the nine months ended September 27, 2018, the Company recorded a gain related to swap activity of $2.6 million, compared to a loss of $1.1 million during the same period in the prior year.

Foreign Currency Forward Contract

As described further in Note 23, Asco Acquisition, the Company and its wholly-owned subsidiary Spirit Belgium entered into the Purchase Agreement pursuant to which Spirit Belgium will purchase all of the issued and outstanding equity of Asco for $650.0 million in cash, subject to certain customary closing adjustments, including foreign currency adjustments. As such, movements in the Euro exchange rates could cause the purchase price to fluctuate, affecting our cash flows.

To reduce the Company's exposure to currency exchange rate fluctuations, the Company entered into foreign currency forward contracts. The objective of these contracts is to minimize the impact of currency exchange rate movements on the Company's cash

50

flows, however the Company has not designated these forward contracts as a hedge and has not applied hedge accounting to them. During the second quarter of 2018, to reduce the Euro exchange rate exposure of the purchase of Asco, the Company entered into a foreign currency forward contract in the amount of $580.0 million; this foreign currency forward contract was settled in the third quarter of 2018. As a result of the settlement of the prior foreign currency foreign contract, and to continue to reduce the Euro exchange rate exposure of the purchase of Asco, the Company entered into entered into a foreign currency forward contract in the amount of $568.3 million. The fair value of the foreign currency forward contract, using Level 2 inputs, was a liability of $6.0 million as of September 27, 2018. The Company recorded a net loss related to foreign currency forward contract activity of $20.7 million for the nine months ended September 27, 2018.

Debt and Other Financing Arrangements

On July 12, 2018, the Company replaced our prior credit agreement with the 2018 Credit Agreement. As of September 27, 2018, the outstanding balance of the 2018 Term Loan was $206.3 million and the carrying value was $204.9 million.

On May 30, 2018, Spirit repurchased $202.6 aggregate principal amount of its 2022 notes pursuant to the Tender Offer and redeemed the remaining 2022 Notes. Following the redemption on June 29, 2018, none of the 2022 Notes remain outstanding.

On May 30, 2018, Spirit entered into an Indenture for the New Notes. The New Notes were issued pursuant to the Company’s shelf registration statement. The carrying value of the Floating Rate Notes, 2023 Notes, and 2028 Notes was $298.4 million, $297.8 million, and $693.3 million as of September 27, 2018, respectively.

The carrying value of the 2026 Notes was $297.5 million as of September 27, 2018.

See Note 15, Debt, to our condensed consolidated financial statements included in Part I of this Quarterly Report for more information.

Advances on the B787 Program.  Boeing has made advance payments to Spirit under the B787 Supply Agreement that are required to be repaid to Boeing by way of offset against the purchase price for future shipset deliveries. As of September 27, 2018, the amount of advance payments received by us from Boeing under the B787 Supply Agreement and not yet repaid was approximately $256.6 million. 

51

Item 3. Quantitative and Qualitative Disclosures About Market Risk

As a result of our operating and financing activities, we are exposed to various market risks that may affect our consolidated results of operations and financial position. These market risks include fluctuations in interest rates, which impact the amount of interest we must pay on our variable rate debt. In addition to other information set forth in this report, you should carefully consider the factors discussed in Item 7A. “Quantitative and Qualitative Disclosures About Market Risk” in our 2017 Form 10-K which could materially affect our business, financial condition or results of operations. There have been no material changes in our market risk since the filing of our 2017 Form 10-K.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our President and Chief Executive Officer and Executive Vice President and Chief Financial Officer have evaluated the effectiveness of our disclosure controls and procedures as of September 27, 2018 and have concluded that these disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Securities Exchange Act of 1934) are effective to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act of 1934, as amended, is recorded, processed, summarized and reported within the time period specified in the SEC rules and forms. These disclosure controls and procedures include, without limitation, controls and procedures designed to provide reasonable assurance that information required to be disclosed by us in the reports we file or submit is accumulated and communicated to management of the Company, including our principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

We have implemented changes to our processes, systems and controls with respect to the adoption of ASC 606. These changes included the development of policies and procedures, training, ongoing contract review requirements, internal management reports, controls related to information systems, and disclosures. There have not been any other significant changes in our internal control over financial reporting during the quarter ended or year ended September 27, 2018, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II — OTHER INFORMATION

Item 1. Legal Proceedings

Information regarding any recent material development relating to our legal proceedings since the filing of our 2017 Form 10-K is included in Note 20, Commitments, Contingencies and Guarantees to our condensed consolidated financial statements included in Part I of this Quarterly Report and incorporated herein by reference.

Item 1A. Risk Factors

In addition to other information set forth in this Quarterly Report, you should carefully consider the factors discussed in Part I, Item 1A, “Risk Factors,” in our 2017 Form 10-K, as updated in our Form 10-Q for the first quarter of 2018, which could materially affect our business, financial condition, or results of operations. There have been no material changes to the Company’s risk factors previously disclosed in our 2017 Form 10-K, as updated in our Form 10-Q for the first quarter of 2018.

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Item 6.  Exhibits

Article I. Exhibit Number	Section 1.01 Exhibit	Incorporated by Reference to the Following Documents
10.1††	Amendment 37 to Special Business Provisions MS-65530-0016, between the Boeing Company and Spirit AeroSystems, Inc., dated as of August 17, 2018.	*
10.2††	Amendment 27 to B787 Special Business Provisions BCA-MS-65530-0019, between the Boeing Company and Spirit AeroSystems, Inc., dated as of August 17, 2018.	*
31.1	Certification of Chief Executive Officer pursuant to Section 302 of Sarbanes-Oxley Act of 2002.	*
31.2	Certification of Chief Financial Officer pursuant to Section 302 of Sarbanes-Oxley Act of 2002.	*
32.1	Certification of Chief Executive Officer pursuant to Section 906 of Sarbanes-Oxley Act of 2002.	**
32.2	Certification of Chief Financial Officer pursuant to Section 906 of Sarbanes-Oxley Act of 2002.	**
101.INS@	XBRL Instance Document.	*
101.SCH@	XBRL Taxonomy Extension Schema Document.	*
101.CAL@	XBRL Taxonomy Extension Calculation Linkbase Document.	*
101.DEF@	XBRL Taxonomy Extension Definition Linkbase Document.	*
101.LAB@	XBRL Taxonomy Extension Label Linkbase Document.	*
101.PRE@	XBRL Taxonomy Extension Presentation Linkbase Document.	*
††	Indicates that portions of the exhibit have been omitted and separately filed with the Securities and Exchange Commission pursuant to a request for confidential treatment.
*	Filed herewith.
**	Furnished herewith.

54

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.

SPIRIT AEROSYSTEMS HOLDINGS, INC.

Signature	Title	Date
/s/ Sanjay Kapoor	Executive Vice President and Chief Financial	October 31, 2018
Sanjay Kapoor	Officer (Principal Financial Officer)

Signature	Title	Date
/s/ John Gilson	Vice President and Corporate Controller (Principal Accounting Officer)	October 31, 2018
John Gilson

55

EX-10.1

EXHIBIT 10.1

Confidential portions of this exhibit have been omitted pursuant to a request for confidential treatment filed separately with the Securities and Exchange Commission. Omissions are designated by the symbol [*****].

AMENDMENT NUMBER 37

TO

SPECIAL BUSINESS PROVISIONS (SBP) MS-65530-0016

BETWEEN

THE BOEING COMPANY

AND

SPIRIT AEROSYSTEMS, INC.

This Amendment (“Amendment”) to Special Business Provisions MS-65530-0016 is entered into as of the date of last signature below between The Boeing Company, a Delaware Corporation ("Boeing"), and SPIRIT AEROSYSTEMS, INC, Wichita, Kansas (“Seller”). Boeing and Seller sometimes are referred to herein individually as a “Party” and collectively as the “Parties.”

RECITALS

A. The Parties entered into Special Business Provisions MS-65530-0016, dated June 16, 2005, (the “SBP”) and the General Terms Agreement BCA-65530-0016, dated June 17, 2005, (the “GTA”), and including any Amendments to the SBP and GTA (collectively the “Sustaining Agreement”).

B. The most recent amendment to the SBP is Amendment 36, entered into June 30, 2018.

C. The Parties entered into a Memorandum of Agreement on June 30, 2018, in which they agreed to, inter alia, a Recurring and Non-Recurring pricing agreement for 767 Section 41 one piece integration work statement.

D. The Parties wish to amend the SBP to reflect the above and the Parties’ settlement on the price adjustment as specifically set forth herein.

AGREEMENT

Now, therefore, in consideration of the mutual covenants set forth herein, the Parties agree as follows:

1. Add the following items to the existing TABLE OF CONTENTS of the SBP:

US:163906565v1

Special Business Provisions

MS-65530-0016

Amendment No. 37

3.3.4.10767 One Piece SOW Tooling

3.3.7767 One Piece SOW Nonrecurring Pricing

3.4.2.2Delivery Point and Schedule for 767 One Piece SOW

3.8767 One Piece SOW Special Provisions

2. The list of “Amendments” within the Sustaining SBP is hereby deleted and replaced in its entirety as follows:

AMENDMENTS

Amend Number	Description	Date	Approval
1	Revise Company name from Mid-Western Aircraft Systems Incorporated to Spirit AeroSystems throughout document. Update attachments 1, 2, 4, 14 and 16.	2/23/2006	H. McCormick R. Stone
2	Incorporate CCNs as listed in Amendment 2, Attachment A, includes addition of new section 12.19, modification to sections 3.4.9, 12.16 and 32.0. Updates to attachments 1, 2, 6, 7, 15, 16, 19 and 20.	4/11/2007	H. McCormick J. Edwards
3	Incorporate CCNs as listed in Amendment 3, Attachment A. Updates to attachments 1, 2, 7, 14, 15, 16 and 22.	11/28/2007	H. McCormick J. Edwards
4	Incorporate CCNs as listed in Amendment 4, Attachment A. Updates to Attachments 1, 2, 7, 14, 15, 16. Incorporate Attachment 1A per CCN 508, 1328.	7/8/2008	S.Hu W. Wallace
5	Incorporate CCNs as listed in Amendment 5, Attachment A, includes addition of new section 12.3.1.1 Updates to Attachments 1, 2, 7, 14, 15, 16, 20.	6/22/2009	S. Hu R. Stone

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

Page 2 of 13

Special Business Provisions

MS-65530-0016

Amendment No. 37

6	Incorporate CCNs as listed in Amendment 6, Attachment A. Updates to Attachments 1, 2, 4, 7, 9, 10, 14, and 16. Incorporate Attachment 9 per CCN 2385.	11/23/2010	S. Hu M. Milan
7	Incorporate CCNs as listed in Amendment 7, Attachment A, includes addition of new section 12.13.3.1. Updates to Attachments 1, 2, 4, 7, 9, 14, and 16. Incorporate Attachment 1B per CCN 4212 and Attachment 23 per the 767-2C MOA.	7/29/2011	S. Hu M. Milan
8	Incorporate CCNs as listed in Amendment 8, Attachment A, includes revisions to section 7.9 and 12.13.1.1. Updates to Attachments 1, 2, 4, 7, 9, 14, 15, and 16.	2/6/2013	C. Howell M. Milan
9	Incorporate Attachment 25 - 737 Max Titanium Inner Wall Agreement.	9/4/2014	E. Flagel M. Milan
10	Incorporate Attachment 26-737 Derailment.	9/2/2014	B. Folden  R. Ast
11	Incorporate Attachment 27 -737-MAX Non Recurring Agreement, and Attachment 28 737/747/767/777 Pricing Agreement. Updates Section 4.1 Attachment 4, Section B.1, Attachments 9 and 15.	3/10/2015	C.Howell R. Ast
12	Delete and replace Attachment 25, Section 3.0.	4/9/2015	K. Drawsky R. Ast

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

Page 3 of 13

Special Business Provisions

MS-65530-0016

Amendment No. 37

13	Incorporate CCNs as listed in Amendment 13, Attachment A. Updates to Attachments 1, 2, 7, 9, 14, and 16.	1/4/2016	L.Taylor K. Leyba
14	Incorporate Attachment 25, Addendum 1.	4/21/2015	D. Blaylock R. Grant
15	NULL
16	NULL
17	Incorporate Attachment 29 - 777X Non-Recurring Agreement.	12/23/2015	A. Lucker E. Bauer
18	NULL
19	NULL
20	737 MAX Inner Wall.	12/17/2015	S. Garcia-Deleone J. Reed
21	Revisions to Attachment 27. 737 MAX Non-Recurring Agreement.	5/9/2016	D. Blaylock R. Grant
22	737 Max Composite Inner Wall Line Movement.	11/2/2016	D. Blaylock E. Bossier
23	737 MAX 9 INITIAL and CIW Line [*****] Tooling Incentive Agreement.	12/16/2016	D. Blaylock E. Bossler
24	Incorporate CCNs as listed in Amendment 23, Attachment A. Updates to Attachments 1,2,7,9, and 14.	12/20/2016	L. Taylor K. Leyba

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

Page 4 of 13

Special Business Provisions

MS-65530-0016

Amendment No. 37

25	Revisions to Attachment 27, 737 MAX Non-Recurring.	3/16/2017	D. Blaylock E. Bossler
26	Revisions to Attachment 27, 737 MAX Non-Recurring Agreement.	3/23/2017	D. Blaylock E. Bossler
27	Incorporate Attachment 30, “737 NG / MAX Vapor Barrier Agreement”, updates to Attachment 1 and 9.	3/31/2017	B. Edwards K. Clark
28	Revisions to Attachment 29, 777X NRE Agreement.	6/22/2017	K. O’Connell C. Green
29	Revisions to Attachment 27, 737 MAX Non-Recurring Agreement.	7/20/2017	D. Blaylock E. Bossler
30	Delete and Replace SBP Sections 4.1, 4.1.1, 5.1.1, 5.2.1, 7.2, 8.0, 12.11, and 12.13.1.1 and SBP Attachments 1, 1B, 10 Section A10.2.10, 15, 16, 22, 27, and 29. Delete and Reserve SBP Attachments 1C, 20, and 28. Incorporate SBP Attachment 1D and 31.	9/29/2017	B. Edwards W. Wilson
31	Revisions to Attachment 27, 737-8 Rate Tooling Incentive Agreement.	10/18/2017	D. Blaylock E. Bossler
32	Revisions to Attachment 27, 737 MAX Non-Recurring Agreement.	11/15/2017	D. Blaylock E. Bossler
33	Revisions to Attachment 27, 737 MAX Non-Recurring Agreement.	11/29/2017	D. Blaylock E. Bossler
34	Revisions to Attachment 27, 737-10 Non-Recurring Non-Tooling.	2/23/2018	D. Blaylock E. Bossler
35	Revisions to Attachment 27, 737-9 Rate Tooling [*****].	4/18/2018	D. Blaylock E. Bossler
36	Revisions to Attachment 27, 737-10 Wing NRE.	6/20/2018	D.Blaylock E.Bossler

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

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Special Business Provisions

MS-65530-0016

Amendment No. 37

37 Incorporation of new Sections: 3.3.4.10 767 One Piece SOW Tooling, 3.3.7 767 One Piece SOW NonRecurring Pricing, 3.4.2.2 Delivery Point and Schedule for 767 One Piece SOW and 3.8 767 One Piece Statement of Work Special Provisions. Updates to Sections 7.1, Attachment 1 and 9. 8/17/18 H. Langowski R. Grant

3. A new SBP Section, 3.3.4.10, is hereby added as follows:

3.3.4.10767 One Piece SOW Tooling

Seller will provide yearly 767 One Piece SOW Tooling Certified Tool Lists, for tools completed in 2018 and 2019, no later than December 31^st of each respective year. The above payments are not contingent upon CTL submittals by Seller for approval by Boeing.

Boeing will provide a LCF transportation tooling fixture and all required certificates.

Seller will follow existing approval processes for CAT 1 and CAT 2 767 One Piece SOW Tooling.

4. A new SBP Section, 3.3.7, is hereby added as follows:

3.3.7767 One Piece SOW Nonrecurring Pricing

The 767 One Piece SOW is for the integration of Section 41 defined per drawing [*****] as modified by PRR [*****] - S 41 Integration, PRR [*****] - Side Panels & ARRP, PRR [*****] - Lower Lobe, PRR [*****] - Cab, and End Item Verification Plan [*****] (the “767 One Piece SOW.”)

Boeing will pay Seller a total amount of $[*****] for the 767 One Piece SOW Nonrecurring Work as follows:

a. $[*****] has been paid for Seller’s previously completed pre-implementation efforts, including:

i. $[*****] that was paid in two installments of $[*****] in [*****] and $[*****] in [*****].

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

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Amendment No. 37

ii. A Purchase Order for $[*****] will be released by Boeing on or before [*****], upon signature of Contract Change Notice (“CCN”) 11572;

b. $[*****] to be paid by Boeing and received by Seller in the [*****] of [*****];

c. $[*****] to be paid by Boeing and received by Seller in the [*****] of [*****]; and

d. No submission of actuals by Seller or verification by Boeing is required for the Nonrecurring Work payments as described above.

5. A new SBP Section, 3.4.2.2, is hereby added as follows:

3.4.2.2Delivery Point and Schedule for 767 One Piece SOW

The 767 One Piece SOW FOB point and title transfer of the End Item from Seller to Boeing shall occur upon loading of the End Item onto the Shipping Mechanical Equipment (“SME”) prior to the End Item being moved out of the Seller’s integration facility by Boeing or its contracted transportation company, provided that there are no ITAR and/or non-US person restrictions. If there are restrictions that do not allow for title transfer inside Seller’s 767 integration facility, then Boeing and Seller will develop a mutually agreed plan for transportation and title transfer, which may result in Seller asserting for an equitable adjustment to schedule or price or both.

Boeing will provide an empty SME at least two (2) manufacturing days prior to the then-current 767 master schedule FOB date.

Boeing will amend the Large Cargo Freighter (LCF) Shipping Documents (as specified in a-j below) by the end of [*****]. The LCF is defined as a modified 747 that is used to transport the 767 One Piece SOW. Seller shall be able to assert for any Change to said documents; no SBP change thresholds shall apply. The Documents to be updated are:

a. [*****] Cargo Control - 747-400 Large Cargo Freighter

b. [*****] Packaging Materials and Processes

c. [*****] Allowable Cargo - 747-400 Large Cargo Freighter

d. [*****] LCF Transportation Integration Process

e. [*****] Lower Lobe Operations 747-400 Large Cargo Freighter

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

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Amendment No. 37

f. [*****] Airframe Wiring Assembly and Installation Protection

g. [*****] 747-400 LCF Shipping Mechanical Equipment

h. [*****] Weight and Balance Compliance

i. [*****] SME Trouble Report Communication Process

j. [*****] 747-400 LCF Flammability Acceptance Criteria

6. A new SBP Section, 3.8, is hereby added as follows:

3.8 767 One Piece SOW Special Provisions

a. Seller will commence delivery of the 767 One Piece Statement of Work at line unit [*****], unless otherwise mutually agreed, and will continue to deliver the 767 One Piece Statement of Work through [*****] units, from and including the line unit of incorporation.

b. Seller shall deliver part number [*****] (“End Item”) as the fully integrated 767 Section 41 incorporating the 767 One Piece Statement of Work. For purposes of the Changes thresholds in the SBP, the Cab, Lower Lobe, Left Panel, Right Panel, and 767 Integration will be treated as separate values.

c. Boeing and Seller will mutually develop a suitable delivery plan for the Aerial Refueling Receptacle Panel (“ARRP”) supporting the schedule load requirements for line unit [*****] and thereafter or as otherwise mutually agreed.

d. Boeing and Seller will develop a mutually agreed onsite support plan in Wichita including necessary planning and preparation activities leading up to and through the first [*****] End Items.

e. Boeing will pay Seller an increased recurring price per shipset to compensate for the 767 One Piece Statement of Work as set forth in SBP Attachment 1 Exhibits D, D1, E1, as follows:

a.$[*****] per shipset for the first [*****] units; and

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

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Amendment No. 37

b.$[*****] per shipset for units [*****] to [*****].

f. Boeing will order [*****] units of 767 Section 41 at an increased incremental price of $[*****] per shipset before [*****].

7. SBP Section 7.1 is hereby amended by deleting and replacing the section in its entirety as follows:

7.1Price Adjustment for Changes

If any individual Change increases or decreases the cost or time required to perform this contract, Boeing and Seller shall negotiate in good faith an equitable adjustment in the price or schedule for recurring and nonrecurring work, or both, to reflect the increase or decrease subject to the following provisions: (i) Seller shall be responsible for absorbing the cost of Seller generated changes to meet requirements and specifications of the Program Statement of Work (PSOW) as described in this SBP and as existing prior to the Change; and (ii) Seller shall be responsible for absorbing the cost of changes required to correct Seller’s deficiencies related to any delegated engineering part (statement of work) of Seller.

Any Boeing-driven Change to the 767 One Piece Statement of Work occurring to any of the first [*****] End Items shall not be subject to the Changes thresholds as described in the SBP. Thereafter, Changes shall be subject to the SBP.

8. SBP Attachment 1 is hereby amended by deleting and replacing Exhibits D, D.1, and E.2 in their entirety as follows:

SBP Attachment 1 Exhibit D “767 Product Pricing Roll Up” is hereby deleted and replaced it in its entirety with a new SBP Attachment 1 Exhibit D, attached hereto as Exhibit A.1.

SBP Attachment 1 Exhibit D.1 “767 Detailed Part List Pricing (Excludes Loose Ship Parts)” is hereby deleted and replaced it in its entirety with a new SBP Attachment 1 Exhibit D.1, attached hereto as Exhibit A.2.

SBP Attachment 1 Exhibit E.2 “767-2C Section 41 Product Pricing” is hereby deleted and replaced it in its entirety with a new SBP Attachment 1 Exhibit E.2, attached hereto as Exhibit A.3.

9. SBP Attachment 9, “NON-RECURRING AGREEMENTS,” is hereby amended to include the 767 One Piece SOW Work Transfer.

10. All other provisions of the SBP shall remain unchanged and in full force and effect.

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

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MS-65530-0016

Amendment No. 37

11. This Amendment constitutes the complete and exclusive Agreement between the Parties with respect to the topics set forth herein. It cancels and supersedes all previous agreements between the Parties relating thereto, whether written or oral.

12. This Amendment shall be governed by the internal laws of the State of Washington without reference to any rules governing conflict of laws.

IN WITNESS THEREOF, the duly authorized representatives of the Parties have executed this Amendment No. 37 as of the last date of signature below.

The Boeing Company		Spirit AeroSystems, Inc
Acing by and through its division
Boeing Commercial Airplanes
By:	/s/ Helena Langowski	By:	/s/ Ryan Grant
Name:	Helena Langowski	Name:	Ryan Grant
Title:	Contracts Procurement Agent	Title:	Sr. Contract Specialist I
Date	August 17, 2018	Date	August 17, 2018

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

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MS-65530-0016

Amendment No. 37

EXHIBIT A.1 TO SBP AMENDMENT NO. 37

Attachment 1 Exhibit D

767 Product Pricing Roll Up

Excludes Loose Ship Parts

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

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Amendment No. 37

EXHIBIT A.2 TO SBP AMENDMENT NO. 37

Attachment 1 Exhibit D.1

767 Detailed Part List Pricing (Excludes Loose Ship Parts)

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

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Amendment No. 37

EXHIBIT A.3 TO SBP AMENDMENT NO. 37

Attachment 1 Exhibit E.2

767-2C Section 41 Product Pricing

(Reference SBP Attachment 23)

Seller Name: Spirit AeroSystems Inc.

Seller Initials: Boeing Initials:

Page 13 of 13

EX-10.2

EXHIBIT 10.2

Confidential portions of this exhibit have been omitted pursuant to a request for confidential treatment filed separately with the Securities and Exchange Commission. Omissions are designated by the symbol [*****].

AMENDMENT NUMBER 27

TO

Special Business Provisions (SBP) BCA-MS-65530-0019

BETWEEN

THE BOEING COMPANY

AND

SPIRIT AEROSYSTEMS, INC.

THIS AMENDMENT NUMBER 27 (“Amendment No. 27”) to Special Business Provisions BCA-MS-65530-0019 is made as of the last date executed below (the “Effective Date”) by and between Spirit AeroSystems, Inc., a Delaware corporation having its principal office in Wichita, Kansas (“Spirit”) and The Boeing Company, a Delaware corporation, acting by and through its division, Boeing Commercial Airplanes (“Boeing”). Hereinafter, Spirit and Boeing may be referred to jointly as the “Parties”.

BACKGROUND

A. The Parties have entered into the General Terms Agreement, GTA BCA-65520-0032, dated June 16, 2005 as amended from time to time (the “GTA”) and the Special Business Provisions, BCA-MS-65530-0019, dated June 16, 2005 as amended from time to time (the "SBP") and now desire to again amend the SBP.

B. This Amendment No. 27 incorporates the CY2017 Annual Shipset Price Adjustments for changes committed on and before December 31, 2017 and which are effective on or before Shipset Line Number [*****] and the annual update of the traveled work cost estimating relationship values.

AGREEMENT

NOW, THEREFORE, in consideration of the foregoing and the mutual agreements contained herein, and for other good and valuable consideration, the value, receipt, and sufficiency of which are hereby acknowledged, the Parties hereby agree as follows:

1. The SBP is hereby amended by deleting the SBP Table of Amendments Page 4 and replacing it in its entirety with a new Table of Amendments Page 4, attached hereto as Exhibit

787 SBP between Boeing and Spirit

SBP BCA-MS-65530-0019, Amendment 27 Boeing Initials:_____Spirit Initials:_____

Page 1 of 15

2. The SBP is hereby amended by deleting SBP Section 7.2.1 “Changes” and replacing it in its entirety with a new SBP Section 7.2.1, attached hereto as Exhibit 2.

3. The SBP is hereby amended by deleting SBP Attachment 1 “Work Statement and Pricing” and replacing it in its entirety with a new SBP Attachment 1, attached hereto as Exhibit 3.

4. The SBP is hereby amended by deleting SBP Attachment 2 “Production Article Definition and Contract Change Notices” and replacing it in its entirety with a new SBP Attachment 2, attached hereto as Exhibit 4.

5. The SBP is hereby amended by deleting SBP Attachment 16 “Pricing Methodologies” Section A “Boeing Performed Repair and Rework” and replacing it in its entirety with a new SBP Attachment 16 Section A, attached hereto as Exhibit 5.

6. Entire Agreement. Except as otherwise indicated in this Amendment No. 27, all terms defined in the GTA or SBP shall have the same meanings when used in this Amendment No. 27. This Amendment No. 27 constitutes the complete and exclusive agreement between the Parties with respect to the subject matter of this Amendment No. 27, and this Amendment No. 27 supersedes all previous agreements between the Parties relating to the subject matter of Amendment No. 27, whether written or oral. The GTA and SBP shall remain in full force and effect and are not modified, revoked, or superseded except as specifically stated in this Amendment No. 27.

IN WITNESS WHEREOF, the duly authorized representatives of the Parties have executed this Amendment No. 27 as of the last date of execution set forth below.

The Boeing Company		Spirit AeroSystems, Inc
Acing by and through its division
Boeing Commercial Airplanes
By:	/s/ Helena Langowski	By:	/s/ Leanna Hampton
Name:	Helena Langowski	Name:	Leanna Hampton
Title:	Contracts Procurement Agent	Title:	Contract Administrator
Date	August 17, 2018	Date	August 9, 2018

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 1

AMENDMENTS

Page 4

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 2

7.2.1 Changes

Except as stated in this SBP Section 7.2.1, Changes authorized by Boeing on or before [*****] that are first effective at Shipset [*****] or earlier, are hereby incorporated into the SBP and are not subject to any Price adjustment. Changes authorized by Boeing in accordance with SBP Section 6.1 subsequent to [*****] that are first effective for Shipsets after Shipset [*****], are subject to Price adjustment in accordance with SBP Sections 7.2.2 and 7.2.3.

The CY2017 Annual Shipset Price Adjustments to be completed in accordance with SBP Section 7.2.2 for recurring shall require a comparison of the configurations of Shipset [*****] (787-8), Shipset [*****] (787-9), and Shipset [*****] (787-10) to the Shipset configurations of the line number of the last Section 41 units delivered by Spirit to Boeing in calendar year 2017 for each model. For all CY2017 Annual Shipset Price Adjustments, the Shipset Price adjustments shall be effective beginning with the line number of the first Section 41 Shipset delivered by Spirit on or after [*****].

Changes authorized by Boeing after [*****] that are first effective from Shipsets [*****] shall be subject to Price adjustment for nonrecurring work in accordance with SBP Section 7.2.2 and SBP Attachment 16 Section C.3.1.2. For the avoidance of doubt, the [*****] value for such changes shall not apply in the CY2017 Annual Shipset Price Adjustments calculations and is considered closed.

Only those changes authorized in writing by Boeing as provided in the Administrative Agreement shall be subject to a Price adjustment pursuant to this SBP Section 7.0. In the event Boeing has formally delegated authority to Spirit to issue engineering design changes independently of Boeing, Spirit shall provide a monthly summary to Boeing’s Procurement Representative of such changes and their anticipated impact to Spirit costs. Provided these conditions are met, such changes shall be considered authorized in writing by Boeing.

When requested by Boeing, Spirit shall participate in and support the evaluation of any change prior to its authorization. This may include, but not be limited to, Spirit cost analysis in a manner that supports timely program decision making, and other processes to be jointly developed by Boeing and Spirit to maintain change visibility by means of tracking and approval processes.

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 3

SBP ATTACHMENT 1 TO

SPECIAL BUSINESS PROVISIONS

WORK STATEMENT AND PRICING

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 3

SBP ATTACHMENT 1 TO

SPECIAL BUSINESS PROVISIONS

WORK STATEMENT AND PRICING (cont.)

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 3

SBP ATTACHMENT 1 TO

SPECIAL BUSINESS PROVISIONS

WORK STATEMENT AND PRICING (cont.)

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 4

SBP ATTACHMENT 2 TO

SPECIAL BUSINESS PROVISIONS

PRODUCTION ARTICLE DEFINITION AND CONTRACT CHANGE NOTICES

(Reference SBP Sections 3.3.2.1, 3.3.2.2, 3.3.4.6, 3.4.1; GTA Section 1.0N,

1.0.P)

A.Configuration

The configuration of each Production Article shall be as described in the Integrated Control Station Plan revision identified below, and in the Contract Change Notices listed in Paragraph B below as such Contract Change Notices relate to the configuration of any Production Article

Type	Product Number	Name	Manufacturing Change Level	Current Mfg Frozen LN	Extended Eff (Usage)
[*****]

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 4

SBP ATTACHMENT 2 TO

SPECIAL BUSINESS PROVISIONS

PRODUCTION ARTICLE DEFINITION AND CONTRACT CHANGE NOTICES

(cont.)

B.Contract Change Notices

The following Contract Change Notices (CCN’s) are hereby incorporated into this SBP.

B.1 Non-D/MI Contract Change Notices:

A. All CCN’s listed in this Section B.1 are inclusive of all revisions and cancellations issued on or before December 21, 2010:

CCN 1 through 318, 320 through 542, 544 through 762, 764 through 766, 768 through 779, 781 through 871, 873 through 889, 891 through 984, 986 through 990, 992 through 1024, 1028 through 1100, 1102 through 1142, 1144 through 1148, 1150 through 1162, 1164 through 1170, 1172 through 1240, 1242 through 1295, 1298 through 1420, 1422 through 1440, 1442 through 1452, 1454 through 1461, 1463 through 1472, 1474 through 1503, 1505 through 1564, 1566 through 1593, 1595 through 1611, 1613 through 1616, 1618 through 1623, 1625 through 1633, 1635 through 1658, 1661 through 1671, 1673 through 1686, 1688 through 1696, 1698, 1700 through 1709, 1710, 1712 through 1716, 1718 through 1748, 1750, 1751, 1753 through 1763, 1765 through 1810, 1814 through 1833, 1837 through 1844, 1846 through 1856, 1858 through 1866, 1868 through 1895, 1897, 1898, 1901, 1904 through 1906, 1908, 1909, 1911 through 1914, 1919, 1921 through 1925, 1928, 1933 through 1937, 1940 through 1943, 1946 through 1950, 1952 through 1963, 1968, 1973 through 1976, 1980, 1982, 1984, 1985, 1988 through 1993, 1995, 1999, 2000, 2004, 2005, 2007, 2014 through 2019, 2021.

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 4

SBP ATTACHMENT 2 TO

SPECIAL BUSINESS PROVISIONS

PRODUCTION ARTICLE DEFINITION AND CONTRACT CHANGE NOTICES

(cont.)

B. All CCN’s listed in this Section B1.B. are inclusive of all revisions committed on and before December 31, 2011 and which are effective on or before Shipset Line Number [*****]:

CCN 319, 543, 763, 767, 780, 991,1025 through 1027, 1101, 1143, 1149, 1171,1296,1297,1421,1441,1473,1504,1565,1594,1617,1624,1634,1659,1660,1687, 1697, 1699, 1717, 1749, 1752, 1764, 1770, 1834, 1836, 1926, 1927, 1929 through 1932, 1938, 1939, 1945, 1951, 1966, 1967, 1969, 1971, 1972, 1977 through 1979, 1981, 1983, 1986, 1987, 1994, 1996 through 1998, 2002, 2003, 2006, 2008 through, 2013, 2020, 2022 through 2037, 2039 through 2058, 2060 through 2073, 2075 through 2111, 2113, 2115, 2116, 2118, 2120 through 2108, 2130 through 2135, 2137 through 2139, 2141, 2143, 2145 through 2157, 2160, 2161, 2162.

C. All CCN’s listed in this Section B1.C. are inclusive of all revisions committed on and before December 31, 2012 and which are effective on or before Shipset Line Number [*****]:

CCN 1835, 1899, 1902, 1903, 1944, 1965, 1970, 2038, 2074, 2112, 2114, 2117, 2142, 2144, 2178.

D. All CCN’s listed in this Section B.1.D are inclusive of all revisions committed on and before December 31, 2013 and which are effective on or before Shipset Line Number [*****]:

CCN 2001, 2059, 2129, 2140, 2172, 2197

E. All CCN’s listed in this Section B.1.E are inclusive of all revisions committed on and before December 31, 2014 and which are effective on or before Shipset Line Number [*****]:

CCN 2171, 2173, 2200

F. CCN 2207 is inclusive of all revisions committed on and before December 31, 2015 and which are effective on or before Shipset Line Number [*****].

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 4

SBP ATTACHMENT 2 TO

SPECIAL BUSINESS PROVISIONS

PRODUCTION ARTICLE DEFINITION AND CONTRACT CHANGE NOTICES

(cont.)

G. CCN 2233 is inclusive of all revisions committed on and before December 31, 2016 and which are effective on or before Shipset Line Number [*****].

H. CCN 2248 is inclusive of all revisions committed on and before December 31, 2017 and which are effective on or before Shipset Line Number [*****].

B.2 D/MI PtP Contract Change Notices:

Section 41 D/MI CCN’s: 1163, 1241, 1915, 1916, 2158, 2159, 2168, 2170R2, 2179, 2198, 2201

Pylon D/MI CCN’s: 1811, 1812, 2166, 2179, 2198, 2201, 2208

Wing LE D/MI CCN’s: 2167, 2170R2, 2198, 2201

CCN’s listed above are inclusive of any numerical formatting convention, i.e. CCN 1 is the same as CCN-00001 or CCN 0001.

B. 3 Price Agreement ContractChange Notices (beginning 05/01/2018):

Section 41: 2246, 2249, 2250, 2251

B. 4 Other Contract Change Notices (beginning 05/01/2018):

2247, 2252

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 5

SBP ATTACHMENT 16 TO

SPECIAL BUSINESS PROVISIONS

PRICING METHODOLOGIES

(Reference SBP Sections 7.8.1, 11.1, 12.10.1)

A. Boeing Performed Repair and Rework

Prices for Boeing performed repair and rework (including traveled or incomplete work) shall utilize the following methodology

A.1Price for non-conformance and traveled work identified in Spirit Generated

Line Unit OSSN EPD (Open Ship Short Notification Emergent Process

Document)

Definitions for Traveled Work Nomenclature:

SOI-A = All Traveled Work other than SOI-B

SOI-B = Traveled work resulting from PMI delivery delays that are the responsibility of Boeing or written instructions by Boeing to not complete certain Spirit responsible work.

Upon delivery of any Product by Spirit, all exceptions to defined configuration are documented by Spirit in a product known as a OSSN EPD or through other approved processes. Upon analysis by Boeing of such OSSN EPDs or other Spirit documented product, Boeing will establish incomplete work, repair and rework to be accomplished at Boeing’s facility. Incomplete Spirit work shall be comprised of incomplete work that is 1) due to Spirit (SOI-A) and 2) due to Boeing (SOI-B). The definition of this incomplete work will be documented in a product known as a “Closure Report”, or through other approved processes. Upon release of a line number Closure Report, or other documentation through approved processes, Boeing shall notify Spirit of the total quantity of SOI’s planned by Boeing for such Shipset multiplied by the prices per unit in table A.1.

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SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 5

SBP ATTACHMENT 16 TO

SPECIAL BUSINESS PROVISIONS

PRICING METHODOLOGIES (cont.)

Boeing shall notify Spirit of the total number of Line Unit OSSN EPDs due to traveled non-conformances. These shall be multiplied by the prices per unit in table A.1. The resulting values shall be the costs and expenses incurred by Boeing for such repair or rework as provided in SBP Section 11.1.

Table A.1

Traveled Work Nomenclature	Price Per Unit
SOI-A	$[*****]
SOI-B	$[*****]
Non-conformance EPD	$[*****]

A.2Price for non-conformance, repair or rework identified at Boeing

Boeing shall consolidate and notify Spirit in a timely manner of all non-conformance EPDs identified at Boeing deemed to be Spirit responsibility. Spirit shall notify Boeing in a timely manner of any exceptions to the assignment of responsibility of any non-conformance EPD. The Parties shall work in good faith to resolve such exceptions.

Upon delivery of an Aircraft to Boeing’s customer, Boeing shall notify Spirit of all non-conformance EPDs identified at Boeing for such Shipset multiplied by the prices per unit in table A.1. The resulting value shall be the costs and expenses incurred by Boeing for such repair or rework as provided in SBP Section 11.1.

A.3Other incomplete work, repair or rework

For any other incomplete work, repair or rework, including such work performed at a consuming partner/supplier, Boeing shall notify Spirit of the costs and expenses incurred by Boeing for such repair and rework.

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SBP ATTACHMENT 16 TO

SPECIAL BUSINESS PROVISIONS

PRICING METHODOLOGIES (cont.)

A.4 Process for updating prices for Boeing performed traveled work, repair and rework

In the third calendar quarter of each year, the fixed prices for traveled work, repair and rework shall be updated.

The value for SOI-A shall be updated based on the following:

The total quantity of Boeing direct factory labor hours expended from January 1 through June 30 (occurring in the same year the third quarter update is being calculated) for those SOI’s completed by Boeing in those calendar months, shall be divided by the total quantity of the same SOI’s used to establish the total quantity of Boeing direct factory labor hours. The quantity of SOI’s shall be determined on a per unit basis. The result shall be the average direct factory labor hours per SOI-A. [*****] additional [*****] shall be added to this average to account for additional support labor (M.E. Planning) not included in the above calculation or the Boeing wrap rate. The sum of the average hours per SOI-A plus [*****] shall be multiplied by the Boeing developed wrap rates. Boeing developed wrap rates shall reflect any annual changes in Boeing rates utilized for traveled work, repair and rework. The result shall be the fixed dollars per SOI-A per unit for such work.

The value for SOI-B’s shall be updated based on the following:

The average direct labor hours per SOI-A described above shall be divided by [*****] and multiplied by the Spirit developed wrap rate as calculated in SBP Attachment 16, Paragraph B. This calculation shall exclude the additional [*****] incorporated in to the SOI-A calculation.

The value for Non-conformance EPD’s shall be updated based on the following:

The total quantity of Boeing direct factory labor hours expended from January 1 through June 30 (occurring in the same year the third quarter update is being calculated) for those EPD’s completed by Boeing in those calendar months, shall be divided by the total quantity of the same EPD’s used to establish the total quantity of Boeing direct factory labor hours. The quantity of EPD’s shall be determined on a per unit basis. The result shall be the average direct factory labor hours per EPD. [*****] additional [*****] shall be added to this average to account for additional overhead not included in the above calculation or the Boeing wrap rate. The sum of the average hours per EPD plus [*****] additional [*****] shall be multiplied by the Boeing developed wrap rates for EPD work. Boeing developed wrap rates shall reflect any annual changes in Boeing rates utilized for traveled work, repair and rework. The result shall be the fixed dollars per EPD per unit for such work.

787 SBP between Boeing and Spirit

SBP BCA-MS-65530-0019, Amendment 27 Boeing Initials:_____Spirit Initials:_____

Page 14 of 15

SBP BCA-MS-65530-0019, Amendment No. 27 Exhibit 5

SBP ATTACHMENT 16 TO

SPECIAL BUSINESS PROVISIONS

PRICING METHODOLOGIES (cont.)

During any update, the Parties may review the relationship of the Boeing direct factory labor hours and the hours of Boeing support to total rework hours and adjust the CER accordingly.

These updated values shall be effective beginning October 1st of each year and shall be in effect until the subsequent annual update.

787 SBP between Boeing and Spirit

SBP BCA-MS-65530-0019, Amendment 27 Boeing Initials:_____Spirit Initials:_____

Page 15 of 15

EX-31.1

EXHIBIT 31.1

CERTIFICATION PURSUANT TO

RULE 13a/15d OF THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Thomas C. Gentile III, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Spirit AeroSystems Holdings, Inc. (“registrant”);

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.

/s/ Thomas C. Gentile III

Thomas C. Gentile III

President and Chief Executive Officer

Date: October 31, 2018

EX-31.2

EXHIBIT 31.2

CERTIFICATION PURSUANT TO

RULE 13a/15d OF THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Sanjay Kapoor, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Spirit AeroSystems Holdings, Inc. (“registrant”);

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.

/s/ Sanjay Kapoor

Sanjay Kapoor

Executive Vice President and Chief Financial Officer

Date: October 31, 2018

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Spirit AeroSystems Holdings, Inc. (the “Company”) on Form 10-Q for the period ended September 27, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Thomas C. Gentile III, as President and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Thomas C. Gentile III

Thomas C. Gentile III

President and Chief Executive Officer

Date: October 31, 2018

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Spirit AeroSystems Holdings, Inc. (the “Company”) on Form 10-Q for the period ended September 27, 2018, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Sanjay Kapoor, as Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Sanjay Kapoor

Sanjay Kapoor

Executive Vice President and Chief Financial Officer

Date: October 31, 2018

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 27, 2018	Oct. 24, 2018
Class Of Stock [Line Items]
Entity Registrant Name	Spirit AeroSystems Holdings, Inc.
Entity Central Index Key	0001364885
Document Type	10-Q
Document Period End Date	Sep. 27, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Amendment Flag	false
Trading Symbol	SPR
Class A [Member]
Class Of Stock [Line Items]
Entity Common Stock, Shares Outstanding		105,997,678
Class B [Member]
Class Of Stock [Line Items]
Entity Common Stock, Shares Outstanding		0

XML

Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Revenues [Abstract]
Revenue	$ 1,813.7	$ 1,748.2	$ 5,386.7	$ 5,268.4
Operating costs and expenses
Cost of sales	1,543.1	1,486.6	4,601.3	4,762.8
Selling, general and administrative	37.3	49.8	154.5	149.9
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds	0.0	0.0	0.0	19.9
Research and development	10.8	9.5	31.3	21.2
Total operating costs and expenses	1,591.2	1,545.9	4,787.1	4,953.8
Operating income	222.5	202.3	599.6	314.6
Interest expense and financing fee amortization	(24.2)	(10.4)	(60.3)	(30.1)
Other income (expense), net	(7.4)	(11.0)	0.8	(32.2)
Income before income taxes and equity in net income of affiliate	205.7	202.9	538.5	316.7
Income tax provision	(36.9)	(55.9)	(99.7)	(84.9)
Income before equity in net income of affiliate	168.8	147.0	438.8	231.8
Equity in net income of affiliate	0.0	0.2	0.6	0.3
Net income	$ 168.8	$ 147.2	$ 439.4	$ 232.1
Earnings per share
Earnings Per Share, Basic	$ 1.61	$ 1.27	$ 4.02	$ 1.97
Diluted (in dollars per share)	1.59	1.26	3.98	1.95
Common Stock, Dividends, Per Share, Declared	$ 0.12	$ 0.10	$ 0.34	$ 0.30

XML

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 168.8	$ 147.2	$ 439.4	$ 232.1
Changes in other comprehensive income, net of tax:
Foreign currency translation adjustments	0.0	13.1	(13.4)	31.2
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(0.6)	(0.6)	(1.8)	(1.5)
Unrealized foreign exchange loss on intercompany loan, net of tax effect of zero and ($0.4) for three months ended, respectively, and $0.3 and ($1.0) for the nine months ended, respectively	0.0	1.3	(1.3)	3.9
Total other comprehensive (loss) income	(0.6)	13.8	(16.5)	33.6
Total comprehensive income	$ 168.2	$ 161.0	$ 422.9	$ 265.7

XML

Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Statement of Comprehensive Income [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	$ 0.1	$ 0.2	$ 0.5	$ 1.2
Unrealized exchange (loss) on intercompany loan, tax	$ 0.0	$ (0.4)	$ 0.3	$ (1.0)

XML

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 27, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 683.4	$ 423.3
Restricted Cash and Cash Equivalents	0.3	2.2
Accounts receivable, net	685.1	722.2
Unbilled Receivables, Current	513.2	0.0
Inventory, net	931.0	1,449.9
Other current assets	35.4	53.5
Total current assets	2,848.4	2,651.1
Property, plant and equipment, net	2,123.0	2,105.3
Unbilled Receivable, Non Current	53.5	0.0
Pension assets	372.3	347.1
Other assets	284.9	164.3
Total assets	5,682.1	5,267.8
Liabilities
Accounts payable	882.4	693.1
Accrued expenses	354.0	269.3
Profit sharing	42.0	109.5
Current portion of long-term debt	25.0	31.1
Advance payments, short-term	112.7	100.0
Billings in Excess of Cost, Current	153.5	0.0
Provision for Loss on Contracts	147.3	0.0
Deferred revenue and other deferred credits, short-term	7.1	64.6
Deferred grant income liability - current	19.4	21.6
Other current liabilities	68.8	331.8
Total current liabilities	1,812.2	1,621.0
Liabilities Noncurrent
Long-term debt	1,869.7	1,119.9
Advance payments, long-term	146.4	231.7
Pension/OPEB obligation	38.4	40.8
Billings in Excess of Cost, Noncurrent	353.8	0.0
Provision for Loss on Contacts, Non Current	72.6	0.0
Deferred grant income liability - non-current	30.7	39.3
Deferred revenue and other deferred credits	26.8	161.0
Other liabilities	215.1	252.6
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, par value $0.01, 10,000,000 shares authorized, no shares issued	0.0	0.0
Additional Paid in Capital [Abstract]
Additional paid-in capital	983.4	1,086.9
AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract
Accumulated other comprehensive loss	(145.0)	(128.5)
Retained Earnings Accumulated Deficit [Abstract]
Retained earnings	2,548.7	2,422.4
Treasury Stock, Value	(2,272.3)	(1,580.9)
Total stockholders’ equity	1,115.9	1,801.0
Noncontrolling interest	0.5	0.5
Total equity	1,116.4	1,801.5
Total liabilities and equity	5,682.1	5,267.8
Class A [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Common stock	$ 1.1	$ 1.1

XML

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 27, 2018	Dec. 31, 2017
Shareholders' equity
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Treasury Stock, Shares	39,624,996	31,467,709
Class A [Member]
Shareholders' equity
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	106,493,926	114,447,605
Class B [Member]
Shareholders' equity
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	0	0

XML

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017
Operating activities
Net income	$ 439.4	$ 232.1
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation expense	171.3	159.0
Amortization expense	0.4	0.2
Amortization of deferred financing fees	17.3	2.5
Accretion of customer supply agreement	3.0	1.5
Employee stock compensation expense	19.9	15.9
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	3.4	1.1
Loss (gain) from foreign currency transactions	0.8	(5.9)
Gain (Loss) on Disposition of Property Plant Equipment	1.7	7.9
Deferred taxes	(37.8)	29.0
Increase (Decrease) in Obligation, Pension and Other Postretirement Benefits	(25.1)	(32.5)
Grant liability amortization	(15.9)	(13.9)
Equity in net income of affiliate	(0.6)	(0.3)
Increase (Decrease) in Forward Provision	(134.0)	0.0
Changes in assets and liabilities
Accounts receivable	(122.3)	(177.8)
Inventory, net	26.7	433.9
Increase (Decrease) in Unbilled Receivables	(50.4)	0.0
Accounts payable and accrued liabilities	279.9	212.8
Profit sharing/deferred compensation	(67.4)	(35.9)
Advance payments	(73.2)	(154.7)
Income taxes receivable/payable	(28.3)	(36.0)
Increase (Decrease) in Billing in Excess of Cost of Earnings	188.0	0.0
Deferred revenue and other deferred credits	(1.1)	(222.8)
Other	(28.3)	208.5
Net cash provided by operating activities	567.4	624.6
Investing activities
Purchase of property, plant and equipment	(170.9)	(138.7)
Payments for (Proceeds from) Other Investing Activities	2.8	0.0
Proceeds from Sales of Assets, Investing Activities		0.4
Net cash used in investing activities	(168.1)	(138.3)
Financing activities
Proceeds from Issuance of Senior Long-term Debt	1,300.0	0.0
Principal payments of debt	(4.9)	(2.3)
Repayments of Debt	(256.3)	(12.5)
Early Repayment of Senior Debt	(300.0)	0.0
Repayments of Senior Debt	(256.3)	(12.5)
Payments Related to Tax Withholding for Share-based Compensation	(15.5)	(13.8)
Debt issuance and financing costs	(23.2)	(0.9)
Proceeds from Other Debt	0.0	7.6
Payments for Repurchase of Common Stock	(805.8)	(402.1)
Payments of Dividends	(35.4)	(35.7)
Net cash used in financing activities	(141.1)	(459.7)
Effect of exchange rate changes on cash and cash equivalents	0.2	5.6
Net increase in cash, cash equivalents, and restricted cash for the period	258.4	32.2
Cash, cash equivalents, and restricted cash, beginning of period	445.5	717.6
Cash, cash equivalents, and restricted cash, end of period	$ 683.4	$ 726.6

XML

Organization and Basis of Interim Presentation

9 Months Ended

Sep. 27, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Basis of Interim Presentation

Organization and Basis of Interim Presentation

Spirit AeroSystems Holdings, Inc. (“Holdings” or the “Company”) provides manufacturing and design expertise in a wide range of fuselage, propulsion, and wing products and services for aircraft original equipment manufacturers (“OEM”) and operators through its subsidiary, Spirit AeroSystems, Inc. (“Spirit”). The Company's headquarters are in Wichita, Kansas, with manufacturing and assembly facilities in Tulsa and McAlester, Oklahoma; Prestwick, Scotland; Wichita, Kansas; Kinston, North Carolina; Subang, Malaysia; and Saint-Nazaire, France.

The accompanying unaudited interim condensed consolidated financial statements include the Company’s financial statements and the financial statements of its majority-owned or controlled subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and the instructions to Form 10-Q and Article 10 of Regulation S-X.  The Company’s fiscal quarters are 13 weeks in length. Since the Company’s fiscal year ends on December 31, the number of days in the Company’s first and fourth quarters varies slightly from year to year. All intercompany balances and transactions have been eliminated in consolidation.

As part of the monthly consolidation process, the Company’s international entities that have functional currencies other than the U.S. dollar are translated to U.S. dollars using the end-of-month translation rate for balance sheet accounts and average period currency translation rates for revenue and income accounts. The U.K. and Malaysian subsidiaries use the British pound as their functional currency. All other foreign subsidiaries and branches use the U.S. dollar as their functional currency.

In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all adjustments (consisting of normal recurring adjustments and elimination of intercompany balances and transactions) considered necessary to fairly present the results of operations for the interim period. The results of operations for the nine months ended September 27, 2018, are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. Certain reclassifications have been made to the prior year financial statements and notes to conform to the 2018 presentation.

In connection with the preparation of the condensed consolidated financial statements, the Company evaluated subsequent events through the date the financial statements were issued. The interim financial statements should be read in conjunction with the audited consolidated financial statements, including the notes thereto, included in the Company’s 2017 Annual Report on Form 10-K filed with the Securities and Exchange Commission (the “SEC”) on February 9, 2018 (the “2017 Form 10-K”).

XML

Changes in Estimates

9 Months Ended

Sep. 27, 2018

Changes in Estimates [Abstract]

Change In Estimate [Text Block]

.  Changes in Estimates

The Company has a periodic forecasting process in which management assesses the progress and performance of the Company’s programs. This process requires management to review each program’s progress by evaluating the program schedule, changes to identified risks and opportunities, changes to estimated revenues and costs for the accounting contracts (and options if applicable), and any outstanding contract matters. Risks and opportunities include but are not limited to management’s judgment about the cost associated with the Company’s ability to achieve the schedule, technical requirements (e.g., a newly-developed product versus a mature product), and any other program requirements. Due to the span of years it may take to completely satisfy the performance obligations for the accounting contracts (and options, if any) and the scope and nature of the work required to be performed on those contracts, the estimation of total revenue and costs is subject to many variables and, accordingly, is subject to change based upon judgment. When adjustments in estimated total consideration or estimated total cost are required, any changes from prior estimates for fully satisfied performance obligations are recognized in the current period as a cumulative catch-up adjustment for the inception-to-date effect of such changes. Cumulative catch-up adjustments are driven by several factors including production efficiencies, assumed rate of production, the rate of overhead absorption, changes to scope of work, and contract modifications. For 2017, the changes in estimates apply to contract blocks under legacy GAAP under the units of delivery method. For 2018, cumulative catch-up adjustments are primarily related to changes in measure of progress for contracts with performance obligations that are satisfied over time. For 2018, forward losses recorded relate primarily to the impact of the adoption of ASU 2017-07 related to pension, offset by favorable performance on cost initiatives.

Changes in estimates are summarized below:

	For the Three Months Ended						For the Nine Months Ended
Changes in Estimates	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
(Unfavorable) Favorable Cumulative Catch-up Adjustment by Segment
Fuselage Systems	$	(12.0	)	$	(2.4	)	$	(3.0	)	$	5.3
Propulsion Systems	(2.4		)	2.4			0.9			4.3
Wing Systems	1.4			(2.8		)	0.9			19.1
Total (Unfavorable) Favorable Cumulative Catch-up Adjustment	$	(13.0	)	$	(2.8	)	$	(1.2	)	$	28.7
(Forward Loss) Changes in Estimate on Loss Programs by Segment
Fuselage Systems	$	—		$	(0.9	)	$	(1.5	)	$	(238.5	)
Propulsion Systems	(0.8		)	1.3			—			(46.7		)
Wing Systems	0.3			(2.4		)	(0.2		)	(74.4		)
Total Forward Loss	$	(0.5	)	$	(2.0	)	$	(1.7	)	$	(359.6	)
Total Change in Estimate	$	(13.5	)	$	(4.8	)	$	(2.9	)	$	(330.9	)
EPS Impact (diluted per share based upon statutory rates)	$	(0.10	)	$	(0.03	)	$	(0.02	)	$	(1.75	)

XML

Accounts Receivable, net

9 Months Ended

Sep. 27, 2018

Accounts Receivable, Net, Current [Abstract]

Accounts Receivable, net

.  Accounts Receivable, net

Accounts receivable represent the Company’s unconditional rights to consideration, subject to the payment terms of the contract, for which only the passage of time is required before payment. For balances as of September 27, 2018, amounts that are receivable or payable that are contingent upon, or related to, satisfied or to be satisfied performance obligations, are presented as contract assets or liabilities. The Company determines an allowance for doubtful accounts based on a review of outstanding receivables that are charged off against the allowance after the potential for recovery is considered remote.

Accounts receivable, net consists of the following:

	September 27, 2018			December 31, 2017
Trade receivables	$	660.0		$	710.5
Other	25.7			13.0
Less: allowance for doubtful accounts	(0.6		)	(1.3		)
Accounts receivable, net	$	685.1		$	722.2

In October 2017, the Company entered into an agreement (the “Receivable Sales Agreement”), to sell, on a revolving basis, certain trade accounts receivable balances to a third party financial institution. Transfers under this agreement are accounted for as sales of receivables resulting in the receivables being de-recognized from the balance sheet. The Receivable Sales Agreement provides for the continuing sale of certain receivables on a revolving basis until terminated by either party. The receivables under the Receivable Sales Agreement are sold without recourse to the third party financial institution. During 2018, $4,145.5 of accounts receivable were sold via this arrangement. The proceeds from these sales of receivables are included in cash from operating activities in the Consolidated Statement of Cash Flows. The recorded net loss on sale of receivables is $12.3 for the nine months ended September 27, 2018 and is included in Other income and expense. See Note 21, Other (Expense) Income, net.

XML

Contract with customer, asset and liability (Notes)

9 Months Ended

Sep. 27, 2018

Revenue from Contract with Customer [Abstract]

contract with customer, asset and liability [Text Block]

7.  Contract Assets and Contract Liabilities

Contract assets primarily represent revenues recognized for performance obligations that have been satisfied but for which amounts have not been billed. Contract assets, current are those for which performance obligations are expected to be fully satisfied within 12 months of contract origination and contract assets, long-term are expected to be fully satisfied over periods greater than 12 months. No impairments to contract assets were recorded for the period ended September 27, 2018.

Contract liabilities are established for cash received that is in excess of revenues recognized and are contingent upon the satisfaction of performance obligations. Contract liabilities primarily consist of cash received on contracts for which revenue has been deferred since the receipts are in excess of transaction price resulting from the allocation of consideration based on relative standalone selling price to future units (including those under option that the Company believes are likely to be exercised) with prices that are lower than standalone selling price. These contract liabilities will be recognized earlier if the options are not fully exercised, or immediately, if the contract is terminated prior to the options being fully exercised.

	January 1, 2018			September 27, 2018			Change
Contract assets	$	517.8		$	566.7		$	48.9
Contract liabilities	(319.4		)	(507.3		)	(187.9		)
Net contract asset	$	198.4		$	59.4		$	(139.0	)

The increase in contract assets reflects the net impact of additional revenue recognized in excess of billed revenues during the period. The increase in contract liabilities reflects the net impact of additional deferred revenues recorded in excess of revenue recognized during the period. For the period ended September 27, 2018, the Company recognized $40.1 of revenue that was included in the contract liability balance at the beginning of the period.

Contract with Customer, Asset and Liability [Table Text Block]

	January 1, 2018			September 27, 2018			Change
Contract assets	$	517.8		$	566.7		$	48.9
Contract liabilities	(319.4		)	(507.3		)	(187.9		)
Net contract asset	$	198.4		$	59.4		$	(139.0	)

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Performance Obligations (Notes)

9 Months Ended

Sep. 27, 2018

Revenue from Contract with Customer [Abstract]

Performance Obligations [Text Block]

8.  Performance Obligations

Unsatisfied, or partially unsatisfied, performance obligations that are expected to be recognized in the future are noted in the table below. The Company expects options to be exercised in addition to the amounts presented below.

	Remaining in 2018	2019	2020	2021 and After
Unsatisfied performance obligations	$1,320.4	$6,302.7	$5,680.9	$1,648.3

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Inventory

9 Months Ended

Sep. 27, 2018

Inventory Disclosure [Abstract]

Inventory

Inventory

Inventory consists of raw materials used in the production process, work-in-process, which is direct material, direct labor, overhead and purchases, and capitalized preproduction costs. Raw materials are stated at lower of cost (principally on an actual or average cost basis) or market. Capitalized pre-production costs include certain contract costs, including applicable overhead, incurred before a product is manufactured on a recurring basis. These costs are typically amortized over a period that is consistent with the satisfaction of the underlying performance obligations to which these relate. See Note 3, Summary of Significant Accounting Policies - Inventory.

For 2017, deferred production includes costs for the excess of production costs over the estimated average cost per shipset, and credit balances for favorable variances on contracts between actual costs incurred and the estimated average cost per shipset for units delivered under the current production blocks. Recovery of excess-over-average deferred production costs is dependent on the number of shipsets ultimately sold and the ultimate selling prices and lower production costs associated with future production under these contract blocks. Forward loss reserves on contract blocks are recorded in the period in which they become evident and are included as a reduction to inventory with remaining amounts, if any, reflected in accrued deferred revenue. Inventories are summarized as follows:

	September 27, 2018		December 31, 2017
Raw materials	$	251.3	$	321.0
Work-in-process(1)	631.0		854.4
Finished goods	8.9		35.8
Product inventory	891.2		1,211.2
Capitalized pre-production(2)	39.8		78.9
Deferred production(3)	—		640.3
Forward loss provision(4)	—		(480.5		)
Total inventory, net	$	931.0	$	1,449.9

(1) For the period ended September 27, 2018, work-in-process inventory includes direct labor, direct material, overhead and purchases on contracts for which revenue is recognized at a point in time as well as sub-assembly parts that have not been issued to production on contracts for which revenue is recognized using the input method. For the period ended December 31, 2017, work-in-process included direct labor, direct material, overhead and purchases on all contracts that were accounted for using the units of delivery method. For the period ended September 27, 2018, work-in-process inventory includes $152.9 of costs incurred in anticipation of specific contracts and no impairments were recorded in the period.

(2) As part of the Transition Adjustment, $43.0 (pretax) of pre-production costs on the A350 XWB were eliminated.

(3) As part of the Transition Adjustment, $640.3 (pretax) of deferred production was eliminated. For the period ended December 31, 2017, the balance contained $632.8 and $129.3 on the A350 XWB and Rolls-Royce BR725 programs, respectively.

(4) For the period ended September 27, 2018, forward loss reserves of $219.9 have been classified as a liability in the condensed consolidated balance sheet. For the period ended December 31, 2017, the forward loss reserve for the B787 program exceeded the program's inventory balance. This excess was classified as a liability and reported in other current liabilities on the balance sheet in the amount of $254.5 as of December 31, 2017.

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Property, Plant and Equipment

9 Months Ended

Sep. 27, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment, net

Property, Plant and Equipment, net

Property, plant and equipment, net consists of the following: 

	September 27, 2018			December 31, 2017
Land	$	15.5		$	15.9
Buildings (including improvements)	813.3			764.1
Machinery and equipment	1,630.3			1,529.9
Tooling	1,027.2			1,013.9
Capitalized software	269.2			263.3
Construction-in-progress	212.5			213.4
Total	3,968.0			3,800.5
Less: accumulated depreciation	(1,845.0		)	(1,695.2		)
Property, plant and equipment, net	$	2,123.0		$	2,105.3

Repair and maintenance costs are expensed as incurred. The Company recognized repair and maintenance costs of $31.3 and $37.6 for the three months ended September 27, 2018 and September 28, 2017, respectively, and $99.0 and $88.9 for the nine months ended September 27, 2018 and September 28, 2017, respectively.

The Company capitalizes certain costs, such as software coding, installation, and testing, that are incurred to purchase or to create and implement internal-use computer software.  Depreciation expense related to capitalized software was $4.1 and $4.5 for the three months ended September 27, 2018 and September 28, 2017, respectively, and $12.7 and $14.8 for the nine months ended September 27, 2018 and September 28, 2017, respectively.

The Company reviews capital and amortizing intangible assets (long-lived assets) for impairment on an annual basis or whenever events or changes in circumstances indicate that the carrying amount may not be recoverable.  The Company evaluated its long-lived assets at its locations and determined no impairment was necessary for the period ended September 27, 2018.

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Fair Value Measurements

9 Months Ended

Sep. 27, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The FASB’s authoritative guidance on fair value measurements defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. It also establishes a fair value hierarchy, which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The guidance discloses three levels of inputs that may be used to measure fair value:

Level 1 Quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt and equity securities and derivative contracts that are traded in an active exchange market.

Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments and derivative contracts whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. Observable inputs, such as current and forward interest rates and foreign exchange rates, are used in determining the fair value of the interest rate swaps and foreign currency hedge contracts.

Level 3 Unobservable inputs that are supported by little or no market activity and are significant to the fair value of assets and liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

At September 27, 2018 and December 31, 2017, the Company did not hold any cash within money market funds.

The Company’s long-term debt includes a senior unsecured term loan and senior unsecured notes.  The estimated fair value of the Company’s debt obligations is based on the quoted market prices for such obligations or the historical default rate for debt with similar credit ratings. The following table presents the carrying amount and estimated fair value of long-term debt:

	September 27, 2018					December 31, 2017
	Carrying Amount		Fair Value			Carrying Amount		Fair Value
Senior unsecured term loan A (including current portion)	$	204.9	$	204.7	(2)	$	460.7	$	461.9	(2)
Senior unsecured notes due 2021	298.4		299.0		(1)	—		—		(1)
Senior unsecured notes due 2022	—		—		(1)	294.8		304.6		(1)
Senior unsecured notes due 2023	297.8		296.8		(1)	—		—		(1)
Senior unsecured notes due 2026	297.5		284.3		(1)	297.2		301.0		(1)
Senior unsecured notes due 2028	693.3		689.4		(1)	—		—		(1)
Total	$	1,791.9	$	1,774.2		$	1,052.7	$	1,067.5

(1) Level 1 Fair Value hierarchy

(2) Level 2 Fair Value hierarchy

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Other Assets

9 Months Ended

Sep. 27, 2018

Other Assets, Noncurrent [Abstract]

Other Assets

.  Other Assets

Other assets are summarized as follows:

	September 27, 2018			December 31, 2017
Intangible assets
Patents	$	1.9		$	1.9
Favorable leasehold interests	6.3			6.3
Total intangible assets	8.2			8.2
Less: Accumulated amortization - patents	(1.9		)	(1.8		)
Accumulated amortization - favorable leasehold interest	(4.8		)	(4.6		)
Intangible assets, net	1.5			1.8
Deferred financing
Deferred financing costs	41.7			39.5
Less: Accumulated amortization - deferred financing costs	(35.3		)	(33.7		)
Deferred financing costs, net	6.4			5.8
Other
Goodwill - Europe	2.4			2.5
Equity in net assets of affiliates	—			4.7
Supply agreements(1)	16.3			19.9
Restricted cash - collateral requirements	20.2			20.0
Deferred Tax Asset - non-current	194.9			72.5
Other	43.2			37.1
Total	$	284.9		$	164.3

(1)    Under two agreements, certain payments accounted for as consideration paid by the Company to a customer and a supplier are being amortized as reductions to net revenues.

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Derivative and Hedging Activities

9 Months Ended

Sep. 27, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative and Hedging Activities

Derivative and Hedging Activities

The Company has historically entered into interest rate swap agreements to reduce its exposure to the variable rate portion of its long-term debt. The Company also considers counterparty credit risk and its own credit risk in its determination of all estimated fair values.

The Company has historically entered into derivative instruments covered by master netting arrangements whereby, in the event of a default as defined by the 2018 Credit Agreement (as defined below) or termination event, the non-defaulting party has the right to offset any amounts payable against any obligation of the defaulting party under the same counterparty agreement. See Note 15, Debt, for more information.

Interest Rate Swaps

On March 15, 2017, the Company entered into an interest rate swap agreement, with an effective date of March 31, 2017. The swaps have a notional value of $250.0 and fix the variable portion of the Company’s floating rate debt at 1.815%. The fair value of the interest rate swaps, using Level 2 inputs, was an asset of $3.5 and $0.9 as of September 27, 2018 and December 31, 2017, respectively. The Company recorded a net gain related to swap activity of $0.3 and $2.6, for the three and nine months ended September 27, 2018, respectively.

Foreign Currency Forward Contract

As described further in Note 23, Asco Acquisition, the Company and its wholly-owned subsidiary Spirit AeroSystems Belgium Holdings BVBA (“Spirit Belgium”) entered into a definitive agreement (the “Purchase Agreement”) with certain private sellers pursuant to which Spirit Belgium will purchase all of the issued and outstanding equity of S.R.I.F. N.V., the parent company of Asco Industries N.V. (“Asco”) for $650.0 in cash, subject to certain customary closing adjustments, including foreign currency adjustments. As such, movements in the Euro exchange rates could cause the purchase price to fluctuate, affecting our cash flows.

To reduce the Company's exposure to currency exchange rate fluctuations, the Company entered into foreign currency forward contracts. The objective of these contracts is to minimize the impact of currency exchange rate movements on the Company's cash flows, however the Company has not designated these forward contracts as a hedge and has not applied hedge accounting to them. During the second quarter of 2018, to reduce the Euro exchange rate exposure of the purchase of Asco, the Company entered into a foreign currency forward contract in the amount of $580.0; this foreign currency forward contract was settled in the third quarter of 2018. Additionally, during the third quarter of 2018, to reduce the Euro exchange rate exposure of the purchase of Asco, the Company entered into a foreign currency forward contract in the amount of $568.3. The fair value of the foreign currency forward contract, using Level 2 inputs, was a liability of $6.0 as of September 27, 2018. The Company recorded a net gain related to foreign currency forward contract activity of $0.8 for the three months ended September 27, 2018 and a net loss of $20.7 for the nine months ended September 27, 2018.

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Advance Payments and Deferred Revenue/Credits

9 Months Ended

Sep. 27, 2018

Advance Payments And Deferred Revenue Credits [Abstract]

Advance Payments And Deferred Revenue Credits

Advance Payments

Advances on the B787 Program.  Boeing has made advance payments to Spirit under the B787 Supply Agreement, that are required to be repaid to Boeing by way of offset against the purchase price for future shipset deliveries. Advance repayments were scheduled to be spread evenly over the remainder of the first 1,000 B787 shipsets delivered to Boeing. On April 8, 2014, the Company signed a memorandum of agreement with Boeing that suspended advance repayments related to the B787 program for a period of twelve months beginning April 1, 2014. Repayment recommenced on April 1, 2015, and any repayments which otherwise would have become due during such twelve-month period will offset the purchase price for shipsets 1,001 through 1,120. In the event Boeing does not take delivery of a sufficient number of shipsets to repay the full amount of advances prior to the termination of the B787 program or the B787 Supply Agreement, any advances not then repaid will be applied against any outstanding payments then due by Boeing to us, and any remaining balance will be repaid in annual installments of $42.0 due on December 15th of each year until the advance payments have been fully recovered by Boeing. As of September 27, 2018, the amount of advance payments received by us from Boeing under the B787 Supply Agreement and not yet repaid was approximately $256.6.

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Debt

9 Months Ended

Sep. 27, 2018

Debt Disclosure [Abstract]

Debt

Debt

Total debt shown on the balance sheet is comprised of the following: 

	September 27, 2018				December 31, 2017
	Current		Noncurrent		Current		Noncurrent
Senior unsecured term loan A	$	17.1	$	187.8	$	24.9	$	435.8
Senior notes due 2021	—		298.4		—		—
Senior notes due 2022	—		—		—		294.8
Senior notes due 2023	—		297.8		—		—
Senior notes due 2026	—		297.5		—		297.2
Senior notes due 2028	—		693.3		—		—
Present value of capital lease obligations	6.9		36.3		5.2		33.6
Other	1.0		58.6		1.0		58.5
Total	$	25.0	$	1,869.7	$	31.1	$	1,119.9

2018 Credit Agreement

On July 12, 2018, the Company entered into a $1,260.0 senior unsecured Second Amended and Restated Credit Agreement among Spirit AeroSystems, Inc., as borrower (“Spirit” or the “Borrower”), the Company, as parent guarantor, the lenders party thereto, Bank of America, N.A., as administrative agent, and the other agents named therein (the “2018 Credit Agreement”), consisting of a $800.0 revolving credit facility (the “2018 Revolver”), a $206.0 term loan A facility (the “2018 Term Loan”) and a $250.0 delayed draw term loan facility (the “Delayed Draw Term Loan”).

Each of the 2018 Revolver, the 2018 Term Loan and the Delayed Draw Term Loan matures July 12, 2023, and bears interest, at Spirit’s option, at either LIBOR plus 1.375% or a defined “base rate” plus 0.375%, subject to adjustment to between LIBOR plus 1.125% and LIBOR plus 1.875% (or between base rate plus 0.125% and base rate plus 0.875%, as applicable) based on changes to Spirit’s senior unsecured debt rating provided by Standard & Poor’s Financial Services LLC and/or Moody’s Investors Service, Inc. The principal obligations under the 2018 Term Loan are to be repaid in equal quarterly installments of $2.6, commencing with the fiscal quarter ending March 31, 2019, and with the balance due at maturity of the 2018 Term Loan. The principal obligations under the Delayed Draw Term Loan are to be repaid in equal quarterly installments of 1.25% of the outstanding principal amount of the Delayed Draw Term Loan as of March 31, 2019, subject to adjustments for any extension of the availability period of the Delayed Draw Term Loan, with the balance due at maturity of the Delayed Draw Term Loan.

The Delayed Draw Term Loan is available for Spirit to draw until January 12, 2019, at which date it may be extended for two additional three-month periods, in each instance subject to Spirit’s payment of a fee to the relevant lenders based on the undrawn Delayed Draw Term Loan commitment.

The 2018 Credit Agreement also contains an accordion feature that provides Spirit with the option to increase the 2018 Revolver commitments and/or institute one or more additional term loans by an amount not to exceed $750.0 in the aggregate, subject to the satisfaction of certain conditions and the participation of the lenders. The 2018 Credit Agreement contains customary affirmative and negative covenants, including certain financial covenants that are tested on a quarterly basis. Spirit’s obligations under the 2018 Credit Agreement may be accelerated upon an event of default, which includes non-payment of principal or interest, material breach of a representation or warranty, material breach of a covenant, cross-default to material indebtedness, material judgments, ERISA events, change in control, bankruptcy and invalidity of the guarantee of Spirit’s obligations under the 2018 Credit Agreement made by the Company.

As a result of the extinguishment of the Company's prior credit agreement, the Company recognized a loss on extinguishment of $1.3, all of which is reflected within amortization of deferred financing fees on the Condensed Consolidated Statement of Cash Flows for the nine months ended September 27, 2018. As of September 27, 2018, the outstanding balance of the 2018 Term Loan was $206.3 and the carrying value was $204.9.

Senior Notes

2022 Notes

On May 22, 2018, the Company commenced an offer to purchase for cash (the “Tender Offer”) any and all of the $300.0 outstanding principal amount of our 5 1/4% Senior Notes due 2022 (the “2022 Notes”). The Tender Offer was made pursuant to an Offer to Purchase dated May 22, 2018, and a related Letter of Transmittal and Notice of Guaranteed Delivery, which set forth the terms and conditions of the Tender Offer in full detail. Under the terms of the Tender Offer, holders of 2022 Notes who validly tendered their notes at or prior to May 29, 2018 would receive, in whole dollars, $1,028.50 per $1,000 principal amount of Notes tendered. Tendering holders will also receive accrued and unpaid interest from the last applicable interest payment date to, but not including, the settlement date of the Tender Offer.

On May 30, 2018, Spirit repurchased $202.6 aggregate principal amount of its 2022 Notes pursuant to the Tender Offer. In addition, on June 29, 2018, Spirit redeemed the remaining $97.4 aggregate principal amount of the 2022 Notes outstanding. The redemption price of the 2022 Notes was 102.85% of the principal amount thereof, plus accrued and unpaid interest to, but not including, the redemption date of June 29, 2018. Following the redemption on June 29, 2018, none of the 2022 Notes remain outstanding.

As a result of the extinguishment of the 2022 Notes, the Company recognized a loss on extinguishment of $13.2, all of which is reflected within amortization of deferred financing fees on the Condensed Consolidated Statement of Cash Flows for the nine months ended September 27, 2018.

New Notes

On May 30, 2018, Spirit entered into an Indenture (the “Indenture”) by and among Spirit, the Company and The Bank of New York Mellon Trust Company, N.A. (the “Trustee”), as trustee in connection with Spirit’s offering of $300.0 aggregate principal amount of its Senior Floating Rate Notes due 2021 (the “Floating Rate Notes”), $300.0 aggregate principal amount of its 3.950% Senior Notes due 2023 (the “2023 Notes”) and $700.0 aggregate principal amount of its 4.600% Senior Notes due 2028 (the “2028 Notes” and, together with the Floating Rate Notes and the 2023 Notes, the “New Notes”). The Company guaranteed Spirit’s obligations under the Notes on a senior unsecured basis (the “Guarantees”).

The Floating Rate Notes bear interest at a rate per annum equal to three-month LIBOR, as determined in the case of the initial interest period, on May 25, 2018, and thereafter at the beginning of each quarterly period as described herein, plus 80 basis points and mature on June 15, 2021. Interest on the Floating Rate Notes is payable on March 15, June 15, September 15 and December 15 of each year, beginning on September 15, 2018.The 2023 Notes bear interest at a rate of 3.950% per annum and mature on June 15, 2023. The 2028 Notes bear interest at a rate of 4.600% per annum and mature on June 15, 2028. Interest on the 2023 Notes and 2028 Notes is payable on June 15 and December 15 of each year, beginning on December 15, 2018. The carrying value of the Floating Rate Notes, 2023 Notes, and 2028 Notes was $298.4, $297.8, and $693.3 as of September 27, 2018, respectively.

The Notes and the Guarantees have been registered under the Securities Act of 1933, as amended (the “Act”), pursuant to a Registration Statement on Form S-3 (No. 333-211423) previously filed with the SEC under the Act.

The Indenture contains covenants that limit Spirit’s, the Company’s and certain of the Company’s subsidiaries’ ability, subject to certain exceptions and qualifications, to create liens without granting equal and ratable liens to the holders of the New Notes and enter into sale and leaseback transactions. These covenants are subject to a number of qualifications and limitations. In addition, the Indenture provides for customary events of default.

2026 Notes

In June 2016, the Company issued $300.0 in aggregate principal amount of 3.850% Senior Notes due June 15, 2026 (the “2026 Notes”) with interest payable, in cash in arrears, on June 15 and December 15 of each year, beginning December 15, 2016. The carrying value of the 2026 Notes was $297.5 as of September 27, 2018.

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Pension and Other Post-Retirement Benefits

9 Months Ended

Sep. 27, 2018

Defined Benefit Plan [Abstract]

Pension and Other Post-Retirement Benefits

Pension and Other Post-Retirement Benefits

	Defined Benefit Plans
	For the Three Months Ended						For the Nine Months Ended
Components of Net Periodic Pension Income	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Service cost	$	0.2		$	0.2		$	0.6		$	0.7
Interest cost	9.2			9.4			27.4			28.3
Expected return on plan assets	(17.4		)	(18.2		)	(52.3		)	(54.6		)
Amortization of net loss	—			0.1			—			0.1
Net periodic pension income	$	(8.0	)	$	(8.5	)	$	(24.3	)	$	(25.5	)

	Other Benefits
	For the Three Months Ended						For the Nine Months Ended
Components of Other Benefit Income	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Service cost	$	0.3		$	0.3		$	0.8		$	0.9
Interest cost	0.3			0.3			0.8			0.9
Amortization of prior service cost	(0.2		)	(0.2		)	(0.7		)	(0.7		)
Amortization of net gain	(0.6		)	(0.5		)	(1.7		)	(1.6		)
Net periodic other benefit income	$	(0.2	)	$	(0.1	)	$	(0.8	)	$	(0.5	)

Employer Contributions

The Company expects to contribute zero dollars to the U.S. qualified pension plan and a combined total of approximately $7.4 for the Supplemental Executive Retirement Plan (“SERP”) and post-retirement medical plans in 2018.  The Company’s projected contributions to the U.K. pension plan for 2018 are $1.8. The entire amount contributed can vary based on exchange rate fluctuations.

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Stock Compensation

9 Months Ended

Sep. 27, 2018

Share-based Compensation [Abstract]

Stock Compensation

 Stock Compensation

The Company recognized a net total of $6.3 and $4.8 of stock compensation expense for the three months ended September 27, 2018 and September 28, 2017, respectively. The Company recognized a net total of $19.9 and $15.9 of stock compensation expense for the nine months ended September 27, 2018 and September 28, 2017, respectively.

During the nine months ended September 27, 2018, 242,419 shares, 92,375 shares, and 63,904 shares of class A common stock with aggregate grant date fair values of $21.5, $8.4 and $5.7 were granted under the service-based, market-based, and performance based portions of the Company’s LTIAs, respectively. Additionally, 460,028 shares of class A common stock with an aggregate grant date fair value of $24.2 that were LTIAs vested during the three months ended September 27, 2018.

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Income Taxes

9 Months Ended

Sep. 27, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The process for calculating the Company’s income tax expense involves estimating actual current taxes due plus assessing temporary differences arising from differing treatment for tax and accounting purposes that are recorded as deferred tax assets and liabilities. Deferred tax assets are periodically evaluated to determine their recoverability. The total net deferred tax asset at September 27, 2018, and December 31, 2017, was $194.5 and $72.2, respectively. The difference is primarily due to the creation of deductible temporary differences within the Transition Adjustment, and the creation of deductible temporary differences and utilization of taxable temporary differences within the current year.

The Company files income tax returns in all jurisdictions in which it operates. The Company establishes reserves to provide for additional income taxes that may be due upon audit. These reserves are established based on management’s assessment as to the potential exposure attributable to permanent tax adjustments and associated interest. All tax reserves are analyzed quarterly and adjustments made as events occur that warrant modification.

In general, the Company records income tax expense each quarter based on its estimate as to the full year’s effective tax rate. Certain items, however, are given discrete period treatment and the tax effects for such items are therefore reported in the quarter that an event arises. Events or items that may give rise to discrete recognition include excess tax benefits with respect to share-based compensation, finalizing amounts in income tax returns filed, finalizing audit examinations for open tax years and expiration of statutes of limitations and changes in tax law.

On December 22, 2017, President Trump signed into law legislation referred to as the “Tax Cuts and Jobs Act” (the “TCJA”). The staff of the SEC has recognized the complexity of reflecting the impacts of the TCJA, and on December 22, 2017, issued guidance in Staff Accounting Bulletin 118 (“SAB 118”) which clarifies accounting for income taxes under ASC 740 if information is not yet available or complete and provides for up to a one-year period in which to complete the required analyses and accounting (the measurement period). SAB 118 describes three scenarios (or “buckets”) associated with a company’s status of accounting for income tax reform: (1) a company is complete with its accounting for certain effects of tax reform, (2) a company is able to determine a reasonable estimate for certain effects of tax reform and records that estimate as a provisional amount, or (3) a company is not able to determine a reasonable estimate and therefore continues to apply ASC 740, based on the provisions of the tax laws that were in effect immediately prior to the TCJA being enacted.

The Company is substantially complete with its accounting for the one-time transition tax liability, enacted by the TCJA, during the third quarter of 2018. As a result, the Company decreased its December 31, 2017 provisional amount by $2.8, which is included as a component of income tax expense from continuing operations. To the extent that the U.S. Treasury issues additional guidance during the SAB 118 measurement period, the Company will promptly evaluate whether any additional adjustments are required.

The TCJA subjects a US stockholder to tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries for years ending after December 31, 2017. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred as a period expense. At September 27, 2018, because the Company is still evaluating the effects of the GILTI provisions, an accounting policy on whether the Company will account for GILTI as a period expense or record deferred taxes for anticipated GILTI has not been made. The Company's accounting for the effects of the GILTI provision is incomplete, however the Company has included estimated GILTI tax related to current-year operations in the Company's annualized effective tax rate and has not provided additional GILTI on deferred items.

The TCJA also introduces base erosion and anti-abuse tax provisions (“BEAT”) for companies that meet certain thresholds by effectively excluding deductions on certain payments to foreign related entities. Although the Company's analysis of the tax effects of the BEAT provision is incomplete the Company does not expect to be subject to the tax.

In January 2018, the FASB issued ASU 2018-02, which gives entities the option to reclassify to retained earnings the tax effects resulting from the TCJA that are stranded in accumulated other comprehensive income (“AOCI”).

The new guidance may be applied retrospectively to each period in which the effect of the TCJA is recognized in the period of adoption. The Company must adopt this guidance for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted for periods for which financial statements have not yet been issued or made available for issuance, including the period the TCJA was enacted. The guidance, when adopted, will require new disclosures regarding a company’s accounting policy for releasing the tax effects in AOCI. The Company is currently evaluating how to apply the new guidance and has not determined whether it will elect to reclassify stranded amounts. The adoption of ASU 2018-02 is not expected to have a material effect on its consolidated financial statements.

The 18.5% effective tax rate for the nine months ended September 27, 2018 differs from the 26.8% effective tax rate for the same period of 2017 primarily due to the enactment of the TCJA, including the reduction in the U.S. corporate federal income tax rate from 35% to 21% and the elimination of the domestic manufacturing deduction, and unrelated to the TCJA, higher state income tax credits generated in 2018 offset by the proportional tax rate effects of lower pre-tax income in 2017.

The Company will continue to participate in the Internal Revenue Service’s Compliance Assurance Process (“CAP”) program for its 2018 tax year. The CAP program’s objective is to resolve issues in a timely, contemporaneous manner and eliminate the need for a lengthy post-filing examination.  There are no open audits in the Company’s foreign jurisdictions. The Company expects no material change in its recorded unrecognized tax benefit liability in the next 12 months

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Equity

9 Months Ended

Sep. 27, 2018

Stockholders' Equity Note [Abstract]

Equity

Equity

Accelerated Share Repurchase Program

In May 2018, the Company entered into accelerated share repurchase agreements (“ASRs”) with Morgan Stanley & Co. LLC and Goldman Sachs & Co. LLC (collectively, the “Dealers”) to repurchase in total $725.0 of the Company’s class A common stock. Under the ASRs, the Company delivered a total of $725.0 in cash to the Dealers and received a total of 7.3 million shares which represented approximately 85% of the total common shares expected to be repurchased under the ASRs based on the closing price on the day the Company entered into the ASRs. The final number of shares to be repurchased and the final average price per share under the ASRs will depend on the volume-weighted average price of the Company’s class A common stock, less a discount, during the term of the agreement. All purchases under the ASRs are expected to be completed in the fourth quarter of 2018.

For further information regarding the ASRs, refer to the Company's Current Report on Form 8-K filed with the SEC on May 30, 2018.

The Company accounts for the ASRs as two separate transactions: (i) as shares of reacquired common stock for the shares delivered to us upon effectiveness of the ASRs and (ii) as a forward contract indexed to the Company's own common stock for the undelivered shares. The initial delivery of shares is included in treasury stock at cost and results in an immediate reduction of the outstanding shares used to calculate the weighted average common shares outstanding for basic and diluted earnings per share. The forward contracts indexed to the Company's own common stock meet the criteria for equity classification, and these amounts are initially recorded in additional paid-in capital and reclassified to treasury stock upon completion of the ASRs.

Earnings per Share Calculation

Basic net income per share is computed using the weighted-average number of outstanding shares of common stock during the measurement period. Diluted net income per share is computed using the weighted-average number of outstanding shares of common stock and, when dilutive, potential outstanding shares of common stock during the measurement period.

The Company accounts for treasury stock under the cost method and includes treasury stock as a component of stockholders’ equity. As of September 27, 2018, no treasury shares have been reissued or retired.

The following table sets forth the computation of basic and diluted earnings per share:

	For the Three Months Ended
	September 27, 2018					September 28, 2017
	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Basic EPS
Income available to common stockholders	$	168.7	105.1	$	1.61	$	147.1	115.8	$	1.27
Income allocated to participating securities	0.1		0.1			0.1		0.1
Net income	$	168.8				$	147.2
Diluted potential common shares			0.9					1.1
Diluted EPS
Net income	$	168.8	106.1	$	1.59	$	147.2	117.0	$	1.26

	For the Nine Months Ended
	September 27, 2018					September 28, 2017
	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Basic EPS
Income available to common shareholders	$	439.1	109.3	$	4.02	$	231.9	117.8	$	1.97
Income allocated to participating securities	0.3		0.1			0.2		0.1
Net income	$	439.4				$	232.1
Diluted potential common shares			0.9					1.1
Diluted EPS
Net income	$	439.4	110.3	$	3.98	$	232.1	119.0	$	1.95

Included in the outstanding common shares were 1.4 million and 1.5 million of issued but unvested shares at September 27, 2018 and September 28, 2017, respectively, which are excluded from the basic EPS calculation.

For the impact of the transition adjustment due to the adoption ASC 606 on retained earnings, see Note 2, Adoption of New Accounting Standards.

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss is summarized by component as follows:

	As of			As of
	September 27, 2018			December 31, 2017
Pension	$	(76.0	)	$	(75.9	)
SERP/Retiree medical	16.0			17.7
Foreign currency impact on long term intercompany loan	(15.5		)	(14.2		)
Currency translation adjustment	(69.5		)	(56.1		)
Total accumulated other comprehensive loss	$	(145.0	)	$	(128.5	)

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Other Income (Expense), Net

9 Months Ended

Sep. 27, 2018

Other Nonoperating Income (Expense) [Abstract]

Other Income (Expense), Net

Other (Expense) Income, Net

Other (expense) income, net is summarized as follows:

	For the Three Months Ended						For the Nine Months Ended
	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Kansas Development Finance Authority bond	$	0.8		$	0.6		$	2.9		$	2.3
Rental and miscellaneous income (loss)	0.6			1.6			(0.7		)	0.2
Interest income	2.1			1.9			5.0			4.4
Foreign currency losses	(1.8		)	(1.1		)	(3.3		)	(1.2		)
Loss on sale of accounts receivable	(4.0		)	—			(12.3		)	—
Pension Income	8.6			9.1			25.7			27.6
Gain (loss) on foreign currency forward contract, net of settlement	0.8			—			(20.7		)	—
Gain (loss) on interest rate swaps, net of settlement	0.3			(1.1		)	2.6			(1.1		)
Total	$	7.4		$	11.0		$	(0.8	)	$	32.2

Foreign currency losses are due to the impact of movement in foreign currency exchange rates on an intercompany revolver and long-term contractual rights/obligations, as well as trade and intercompany receivables/payables that are denominated in a currency other than the entity’s functional currency.

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Segment Information

9 Months Ended

Sep. 27, 2018

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company operates in three principal segments: Fuselage Systems, Propulsion Systems, and Wing Systems. Revenue from Boeing represents a substantial portion of the Company's revenues in all segments. Wing Systems also includes significant revenues from Airbus. Approximately 95% of the Company's net revenues for the three months ended September 27, 2018, came from the Company's two largest customers, Boeing and Airbus. All other activities fall within the All Other segment, principally made up of sundry sales of miscellaneous services, tooling contracts and sales of natural gas through a tenancy-in-common with other companies that have operations in Wichita, Kansas. The Company's primary profitability measure to review a segment’s operating performance is segment operating income before corporate selling, general and administrative expenses, research and development, and unallocated cost of sales.

Corporate selling, general and administrative expenses include centralized functions such as accounting, treasury, and human resources that are not specifically related to the Company's operating segments and are not allocated in measuring the operating segments’ profitability and performance and net profit margins. Research and development includes research and development efforts that benefit the Company as a whole and are not unique to a specific segment. Unallocated cost of sales includes general costs not directly attributable to segment operations, such as warranty, early retirement and other incentives. All of these items are not specifically related to the Company’s operating segments and are not utilized in measuring the operating segments’ profitability and performance.

The Company’s Fuselage Systems segment includes development, production, and marketing of forward, mid and rear fuselage sections and systems, primarily to aircraft OEMs (OEM refers to aircraft original equipment manufacturer), as well as related spares and maintenance, repairs and overhaul (“MRO”) services.  The Fuselage Systems segment manufactures products at the Company's facilities in Wichita, Kansas and Kinston, North Carolina.  The Fuselage Systems segment also includes an assembly plant for the A350 XWB aircraft in Saint-Nazaire, France.

The Company’s Propulsion Systems segment includes development, production and marketing of struts/pylons, nacelles (including thrust reversers), and related engine structural components primarily to aircraft or engine OEMs, as well as related spares and MRO services.  The Propulsion Systems segment manufactures products at the Company's facility in Wichita, Kansas.

The Company’s Wing Systems segment includes development, production and marketing of wings and wing components (including flight control surfaces), and other miscellaneous structural parts primarily to aircraft OEMs, as well as related spares and MRO services. These activities take place at the Company’s facilities in Tulsa and McAlester, Oklahoma; Kinston, North Carolina; Prestwick, Scotland; and Subang, Malaysia.

 The Company’s segments are consistent with the organization and responsibilities of management reporting to the chief operating decision-maker for the purpose of assessing performance. The Company’s definition of segment operating income differs from net profit margin as presented in its primary financial statements and a reconciliation of the segment and consolidated results is provided in the table set forth below.

 While some working capital accounts are maintained on a segment basis, much of the Company’s assets are not managed or maintained on a segment basis. Property, plant and equipment, including tooling, is used in the design and production of products for each of the segments and, therefore, is not allocated to any individual segment. In addition, cash, prepaid expenses, other assets and deferred taxes are managed and maintained on a consolidated basis and generally do not pertain to any particular segment. Raw materials and certain component parts are used in aerostructure production across all segments. Work-in-process inventory is identifiable by segment, but is managed and evaluated at the program level. As there is no segmentation of the Company’s productive assets, depreciation expense (included in fixed manufacturing costs and selling, general and administrative expenses) and capital expenditures, no allocation of these amounts has been made solely for purposes of segment disclosure requirements.

The following table shows segment revenues and operating income for the three and nine months ended September 27, 2018, and September 28, 2017:

	Three Months Ended						Nine Months Ended
	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Segment Revenues
Fuselage Systems	$	991.0		$	957.0		$	2,983.4		$	2,812.1
Propulsion Systems	442.4			407.9			1,259.6			1,250.7
Wing Systems	378.6			382.2			1,138.6			1,201.7
All Other	1.7			1.1			5.1			3.9
	$	1,813.7		$	1,748.2		$	5,386.7		$	5,268.4
Segment Operating Income (Loss)
Fuselage Systems (1)	$	134.8		$	143.8		$	417.7		$	205.0
Propulsion Systems (1)	76.2			72.4			203.9			183.4
Wing Systems (1)	58.6			49.1			166.1			134.7
All Other	1.3			0.2			0.3			(0.5		)
	270.9			265.5			788.0			522.6
SG&A	(37.3		)	(49.8		)	(154.5		)	(149.9		)
Impact of severe weather event	—			—			—			(19.9		)
Research and development	(10.8		)	(9.5		)	(31.3		)	(21.2		)
Unallocated cost of sales	(0.3		)	(3.9		)	(2.6		)	(17.0		)
Total operating income	$	222.5		$	202.3		$	599.6		$	314.6

(1) Prior period information has been reclassified as a result of the Company's adoption of ASU 2017-07 on a retrospective basis in 2018. In accordance with the adoption of this guidance, prior year amounts related to the components of net periodic pension and postretirement benefit cost other than service costs have been reclassified from cost of sales and selling, general and administrative expense to other income (expense) within the consolidated statement of operations for all periods presented. Accordingly, expenses of $4.5, $1.8, and $1.8 on the Fuselage, Systems Propulsion Systems, and Wing Systems, respectively, were reclassified into segment operating income for the three months ended September 28, 2017 and expenses of $13.5, $5.5, and $5.5 on the Fuselage Systems, Propulsion Systems, and Wing Systems, respectively, were reclassified into segment operating income for the nine months ended September 28, 2017.

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Business Combination (Notes)

9 Months Ended

Sep. 27, 2018

Business Acquisition [Line Items]

Business Combination Disclosure [Text Block]

23.  Asco Acquisition

On May 1, 2018, the Company and its wholly-owned subsidiary Spirit Belgium entered into the Purchase Agreement pursuant to which Spirit Belgium will purchase all of the issued and outstanding equity of Asco, a leading supplier of high lift wing structures, mechanical assemblies and major functional components to major OEMs and Tier I suppliers in the global commercial aerospace and military markets, for the translated amount of $650.0 in cash, subject to certain customary closing adjustments, including foreign currency adjustments. The definitive agreement is subject to customary closing conditions, including regulatory approvals and customer consents.

One of the closing conditions is receipt of clearance from the European Commission (the “Commission”). During the scope of the Commission’s Phase 1 review, the Commission identified issues that it requires to be addressed regarding the transaction. Consequently, on October 26, 2018, the Company withdrew its notification of the transaction from the Commission in order to address those issues. The withdrawal interrupts the Commission’s current review of the transaction. The Company and Asco will work to refile the notification in a timely manner.

Acquisition-related expenses were $14.8 for the nine months ended September 27, 2018 and are included in selling, general and administrative costs on the condensed and consolidated statements of operations.

The foregoing description of the Purchase Agreement does not purport to be complete and is qualified in its entirety by reference to the description set forth in the Company’s Current Report on Form 8-K filed with the SEC on May 2, 2018, and the full text of the Purchase Agreement, which was filed as an exhibit to the Company's Form 10-Q filed with the SEC on August 1, 2018.

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Condensed Consolidating Financial Information

9 Months Ended

Sep. 27, 2018

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Consolidating Financial Information

Condensed Consolidating Financial Information

The Floating Rate Notes, 2023 Notes, 2026 Notes, and 2028 Notes (collectively, the “Notes”) are fully and unconditionally guaranteed on a senior unsecured basis by Holdings. No subsidiaries are guarantors to any of the Notes.

The following condensed consolidating financial information, which has been prepared in accordance with the requirements for presentation of Rule 3-10(d) of Regulation S-X promulgated under the Securities Act, presents the condensed consolidating financial information separately for:

(i) Holdings, as the parent company and parent guarantor of the Notes, as further detailed in Note 15, Debt;

(ii) Spirit, as the issuer of the Notes;

(iii) The Company’s subsidiaries, (the “Non-Guarantor Subsidiaries”) on a combined basis;

(iv) Consolidating entries and eliminations representing adjustments to (a) eliminate intercompany transactions between or among Holdings and the Non-Guarantor Subsidiaries, (b) eliminate the investments in the Company’s subsidiaries, and (c) record consolidating entries; and

(v) Holdings and its subsidiaries on a consolidated basis.

Condensed Consolidating Statements of Operations

For the Three Months Ended September 27, 2018

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenue	$	—		$	1,636.1		$	305.6		$	(128.0	)	$	1,813.7
Operating costs and expenses
Cost of sales	—			1,395.9			275.2			(128.0		)	1,543.1
Selling, general and administrative	2.3			31.4			3.6			—			37.3
Research and development	—			9.2			1.6			—			10.8
Total operating costs and expenses	2.3			1,436.5			280.4			(128.0		)	1,591.2
Operating (loss) income	(2.3		)	199.6			25.2			—			222.5
Interest expense and financing fee amortization	—			(24.2		)	(1.2		)	1.2			(24.2		)
Other income (expense), net	—			9.6			(1.0		)	(1.2		)	7.4
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(2.3		)	185.0			23.0			—			205.7
Income tax benefit (provision)	0.4			(33.7		)	(3.6		)	—			(36.9		)
(Loss) income before equity in net income of affiliate and subsidiaries	(1.9		)	151.3			19.4			—			168.8
Equity in net income of affiliate	—			—			—			—			—
Equity in net income of subsidiaries	170.7			19.4			—			(190.1		)	—
Net income	168.8			170.7			19.4			(190.1		)	168.8
Other comprehensive (loss) income	(0.6		)	(0.6		)	0.1			0.5			(0.6		)
Comprehensive income (loss)	$	168.2		$	170.1		$	19.5		$	(189.6	)	$	168.2

Condensed Consolidating Statements of Operations

For the Three Months Ended September 28, 2017

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenue	$	—		$	1,573.0		$	311.8		$	(136.6	)	$	1,748.2
Operating costs and expenses
Cost of sales	—			1,339.2			284.0			(136.6		)	1,486.6
Selling, general and administrative	3.9			42.3			3.6			—			49.8
Impact of severe weather event	—			—			—			—			—
Research and development	—			8.8			0.7			—			9.5
Total operating costs and expenses	3.9			1,390.3			288.3			(136.6		)	1,545.9
Operating (loss) income	(3.9		)	182.7			23.5			—			202.3
Interest expense and financing fee amortization	—			(10.5		)	(1.3		)	1.4			(10.4		)
Other income (expense), net	—			13.1			(0.7		)	(1.4		)	11.0
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(3.9		)	185.3			21.5			—			202.9
Income tax benefit (provision)	0.8			(53.0		)	(3.7		)	—			(55.9		)
(Loss) income before equity in net income of affiliate and subsidiaries	(3.1		)	132.3			17.8			—			147.0
Equity in net income of affiliate	0.2			—			0.2			(0.2		)	0.2
Equity in net income of subsidiaries	150.1			17.7			—			(167.8		)	—
Net income	147.2			150.0			18.0			(168.0		)	147.2
Other comprehensive (loss) income	13.8			13.8			14.3			(28.1		)	13.8
Comprehensive income (loss)	$	161.0		$	163.8		$	32.3		$	(196.1	)	$	161.0

Condensed Consolidating Statements of Operations

For the Nine Months EndedSeptember 27, 2018

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net revenues	$	—		$	4,831.3		$	1,017.6		$	(462.2	)	$	5,386.7
Operating costs and expenses
Cost of sales	—			4,147.8			915.7			(462.2		)	4,601.3
Selling, general and administrative	8.0			133.1			13.4			—			154.5
Research and development	—			27.8			3.5			—			31.3
Total operating costs and expenses	8.0			4,308.7			932.6			(462.2		)	4,787.1
Operating (loss) income	(8.0		)	522.6			85.0			—			599.6
Interest expense and financing fee amortization	—			(60.1		)	(4.0		)	3.8			(60.3		)
Other income (expense), net	—			6.6			(3.6		)	(3.8		)	(0.8		)
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(8.0		)	469.1			77.4			—			538.5
Income tax benefit (provision)	1.5			(88.6		)	(12.6		)	—			(99.7		)
(Loss) income before equity in net income of affiliate and subsidiaries	(6.5		)	380.5			64.8			—			438.8
Equity in net income of affiliate	0.6			—			0.6			(0.6		)	0.6
Equity in net income of subsidiaries	445.3			64.8			—			(510.1		)	—
Net income	439.4			445.3			65.4			(510.7		)	439.4
Other comprehensive (loss) income	(16.5		)	(16.5		)	(14.7		)	31.2			(16.5		)
Comprehensive income (loss)	$	422.9		$	428.8		$	50.7		$	(479.5	)	$	422.9

Condensed Consolidating Statements of Operations

For the Nine Months EndedSeptember 28, 2017

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net revenues	$	—		$	4,701.1		$	1,025.4		$	(458.1	)	$	5,268.4
Operating costs and expenses
Cost of sales	—			4,307.4			913.5			(458.1		)	4,762.8
Selling, general and administrative	8.8			130.4			10.7			—			149.9
Impact of severe weather event	—			19.9			—			—			19.9
Research and development	—			19.4			1.8			—			21.2
Total operating costs and expenses	8.8			4,477.1			926.0			(458.1		)	4,953.8
Operating (loss) income	(8.8		)	224.0			99.4			—			314.6
Interest expense and financing fee amortization	—			(30.1		)	(4.5		)	4.5			(30.1		)
Other income (expense), net	—			37.4			(0.7		)	(4.5		)	32.2
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(8.8		)	231.3			94.2			—			316.7
Income tax (provision) benefit	2.7			(70.2		)	(17.4		)	—			(84.9		)
(Loss) income before equity in net income of affiliate and subsidiaries	(6.1		)	161.1			76.8			—			231.8
Equity in net income of affiliate	0.3			—			0.3			(0.3		)	0.3
Equity in net income of subsidiaries	237.9			76.8			—			(314.7		)	—
Net income	232.1			237.9			77.1			(315.0		)	232.1
Other comprehensive (loss) income	33.6			33.6			35.0			(68.6		)	33.6
Comprehensive income (loss)	$	265.7		$	271.5		$	112.1		$	(383.6	)	$	265.7

Condensed Consolidating Balance Sheet

September 27, 2018

	Holdings		Spirit		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets
Cash and cash equivalents	$	—	$	621.5	$	61.9	$	—		$	683.4
Restricted cash	—		0.3		—		—			0.3
Accounts receivable, net	—		730.1		322.7		(367.7		)	685.1
Contract assets, short-term	—		467.7		45.5		—			513.2
Inventory, net	—		610.1		320.9		—			931.0
Other current assets	—		32.4		3.0		—			35.4
Total current assets	—		2,462.1		754.0		(367.7		)	2,848.4
Property, plant and equipment, net	—		1,621.1		501.9		—			2,123.0
Contract assets, long-term	—		53.5		—		—			53.5
Pension assets, net	—		351.3		21.0		—			372.3
Investment in subsidiary	1,116.4		686.5		—		(1,802.9		)	—
Other assets	—		372.8		130.5		(218.4		)	284.9
Total assets	$	1,116.4	$	5,547.3	$	1,407.4	$	(2,389.0	)	$	5,682.1
Liabilities
Accounts payable	$	—	$	837.6	$	412.5	$	(367.7	)	$	882.4
Accrued expenses	—		317.6		36.4		—			354.0
Profit sharing	—		38.4		3.6		—			42.0
Current portion of long-term debt	—		24.1		0.9		—			25.0
Advance payments, short-term	—		112.7		—		—			112.7
Contract liabilities, short-term	—		153.5		—		—			153.5
Forward loss provision, long-term	—		147.3		—		—			147.3
Deferred revenue and other deferred credits, short-term	—		6.6		0.5		—			7.1
Deferred grant income liability - current	—		—		19.4		—			19.4
Other current liabilities	—		68.8		—		—			68.8
Total current liabilities	—		1,706.6		473.3		(367.7		)	1,812.2
Long-term debt	—		1,862.0		125.5		(117.8		)	1,869.7
Advance payments, long-term	—		144.2		2.2		—			146.4
Pension/OPEB obligation	—		38.4		—		—			38.4
Contract liabilities, long-term	—		353.8		—		—			353.8
Forward loss provision, long-term	—		72.6		—		—			72.6
Deferred grant income liability - non-current	—		5.8		24.9		—			30.7
Deferred revenue and other deferred credits	—		24.3		2.5		—			26.8
Other liabilities	—		303.2		12.5		(100.6		)	215.1
Total equity	1,116.4		1,036.4		766.5		(1,802.9		)	1,116.4
Total liabilities and stockholders’ equity	$	1,116.4	$	5,547.3	$	1,407.4	$	(2,389.0	)	$	5,682.1

Condensed Consolidating Balance Sheet

December 31, 2017

	Holdings		Spirit		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets
Cash and cash equivalents	$	—	$	365.1	$	58.2	$	—		$	423.3
Restricted cash	—		2.2		—		—			2.2
Accounts receivable, net	—		752.6		330.9		(361.3		)	722.2
Inventory, net	—		1,010.0		439.9		—			1,449.9
Other current assets	—		50.3		3.2		—			53.5
Total current assets	—		2,180.2		832.2		(361.3		)	2,651.1
Property, plant and equipment, net	—		1,585.8		519.5		—			2,105.3
Pension assets, net	—		327.2		19.9		—			347.1
Investment in subsidiary	1,801.5		704.4		—		(2,505.9		)	—
Other assets	—		298.2		124.5		(258.4		)	164.3
Total assets	$	1,801.5	$	5,095.8	$	1,496.1	$	(3,125.6	)	$	5,267.8
Liabilities
Accounts payable	$	—	$	629.0	$	425.4	$	(361.3	)	$	693.1
Accrued expenses	—		239.5		29.8		—			269.3
Profit sharing	—		103.4		6.1		—			109.5
Current portion of long-term debt	—		30.2		0.9		—			31.1
Advance payments, short-term	—		100.0		—		—			100.0
Deferred revenue and other deferred credits, short-term	—		63.6		1.0		—			64.6
Deferred grant income liability - current	—		—		21.6		—			21.6
Other current liabilities	—		324.3		7.5		—			331.8
Total current liabilities	—		1,490.0		492.3		(361.3		)	1,621.0
Long-term debt	—		1,110.6		167.1		(157.8		)	1,119.9
Advance payments, long-term	—		231.7		—		—			231.7
Pension/OPEB obligation	—		40.8		—		—			40.8
Deferred grant income liability - non-current	—		—		39.3		—			39.3
Deferred revenue and other deferred credits	—		158.2		2.8		—			161.0
Other liabilities	—		343.1		10.1		(100.6		)	252.6
Total equity	1,801.5		1,721.4		784.5		(2,505.9		)	1,801.5
Total liabilities and stockholders’ equity	$	1,801.5	$	5,095.8	$	1,496.1	$	(3,125.6	)	$	5,267.8

Condensed Consolidating Statements of Cash Flows

For the Nine Months EndedSeptember 27, 2018

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments		Total
Operating activities
Net cash provided by operating activities	$	—		$	486.1		$	81.3		$	—	$	567.4
Investing activities
Purchase of property, plant and equipment	—			(142.9		)	(28.0		)	—		(170.9		)
Other	—			2.3			0.5			—		2.8
Net cash used in investing activities	—			(140.6		)	(27.5		)	—		(168.1		)
Financing activities
Proceeds from issuance of bonds	—			1,300.0			—			—		1,300.0
Principal payments of debt	—			(4.3		)	(0.6		)	—		(4.9		)
Payments on term loan	—			(256.3		)				—		(256.3		)
Payments on bonds	—			(300.0		)	—			—		(300.0		)
Proceeds (payments) from intercompany debt	—			49.7			(49.7		)	—		—
Debt issuance and financing costs	—			(23.2		)	—			—		(23.2		)
Taxes paid related to net share settlement of awards	—			(15.5		)	—			—		(15.5		)
Proceeds (payments) from subsidiary for purchase of treasury stock	805.8			(805.8		)	—			—		—
Purchase of treasury stock	(805.8		)	—			—			—		(805.8		)
Proceeds (payments) from subsidiary for dividends paid	35.4			(35.4		)	—			—		—
Dividends Paid	(35.4		)	—			—			—		(35.4		)
Net cash used in financing activities	—			(90.8		)	(50.3		)	—		(141.1		)
Effect of exchange rate changes on cash and cash equivalents	—			—			0.2			—		0.2
Net increase in cash, cash equivalents, and restricted cash for the period	—			254.7			3.7			—		258.4
Cash, cash equivalents, and restricted cash, beginning of period	—			387.3			58.2			—		445.5
Cash, cash equivalents, and restricted cash, end of period	$	—		$	642.0		$	61.9		$	—	$	703.9

Condensed Consolidating Statements of Cash Flows

For the Nine Months EndedSeptember 28, 2017

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments		Total
Operating activities
Net cash provided by operating activities	$	—		$	525.7		$	98.9		$	—	$	624.6
Investing activities
Purchase of property, plant and equipment	—			(122.1		)	(16.6		)	—		(138.7		)
Proceeds from sale of assets	—			0.4			—			—		0.4
Other	—			—			—			—		—
Net cash used in investing activities	—			(121.7		)	(16.6		)	—		(138.3		)
Financing activities
Principal payments of debt	—			(0.7		)	(1.6		)	—		(2.3		)
Payment on term loan	—			(12.5		)	—			—		(12.5		)
Proceeds (payments) from intercompany debt	—			65.1			(65.1		)	—		—
Taxes paid related to net share settlement of awards	—			(13.8		)	—			—		(13.8		)
Debt issuance and financing costs	—			(0.9		)	—			—		(0.9		)
Proceeds from financing under the New Markets Tax Credit Program	—			7.6			—			—		7.6
Proceeds (payments) from subsidiary for purchase of treasury stock	402.1			(402.1		)	—			—		—
Purchase of treasury stock	(402.1		)	—			—			—		(402.1		)
Proceeds (payments) from subsidiary for dividends paid	35.7			(35.7		)	—			—		—
Dividends Paid	(35.7		)	—			—			—		(35.7		)
Net cash used in financing activities	—			(393.0		)	(66.7		)	—		(459.7		)
Effect of exchange rate changes on cash and cash equivalents	—			—			5.6			—		5.6
Net increase in cash, cash equivalents, and restricted cash for the period	—			11.0			21.2			—		32.2
Cash, cash equivalents, and restricted cash, beginning of period	—			700.0			17.6			—		717.6
Cash, cash equivalents, and restricted cash, end of period	$	—		$	711.0		$	38.8		$	—	$	749.8

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Commitments, Contingencies and Guarantees

9 Months Ended

Sep. 27, 2018

Commitments Contingencies And Guarantees [Abstract]

Commitments, Contingencies and Guarantees

Commitments, Contingencies and Guarantees

Litigation

From time to time the Company is subject to, and is presently involved in, litigation or other legal proceedings arising in the ordinary course of business. While the final outcome of these matters cannot be predicted with certainty, considering, among other things, the meritorious legal defenses available, it is the opinion of the Company that none of these items, when finally resolved, will have a material adverse effect on the Company’s long-term financial position or liquidity.

From time to time, in the ordinary course of business and similar to others in the industry, the Company receives requests for information from government agencies in connection with their regulatory or investigational authority. Such requests can include subpoenas or demand letters for documents to assist the government in audits or investigations. The Company reviews such requests and notices and takes appropriate action. Additionally, the Company is subject to federal and state requirements for protection of the environment, including those for disposal of hazardous waste and remediation of contaminated sites. As a result, the Company is required to participate in certain government investigations regarding environmental remediation actions.

Pension Indemnification.On December 5, 2014, Boeing filed a complaint in Delaware Superior Court, Complex Commercial Litigation Division, entitled The Boeing Co. v. Spirit AeroSystems, Inc., No. N14C-12-055 (EMD) (the “Complaint”) seeking indemnification of approximately $139.0 from Spirit for (a) damages assessed against Boeing in International Union, United Automobile, Aerospace and Agricultural Workers of America v. Boeing Co., AAA Case No. 54 300 00795 07 (“UAW Arbitration”), which was brought on behalf of certain former Boeing employees in Tulsa and McAlester, Oklahoma, (b) claims that Boeing settled in Society of Professional Engineering Employees in Aerospace v. Boeing Co., Nos. 05-1251-MLB, 07-1043-MLB (D. Kan.) (“Harkness Class Action”), and (c) attorneys’ fees Boeing alleges it expended to defend the UAW Arbitration and Harkness Class Action, as well as reasonable fees, costs and expenses Boeing expends litigating the case against Spirit. Boeing’s Complaint asserts that the damages assessed against Boeing in the UAW Arbitration and the claims settled by Boeing in the Harkness Class Action are liabilities that Spirit assumed under an Asset Purchase Agreement between Boeing and Spirit, dated February 22, 2005 (the “APA”). Boeing asserts claims for breach of contract and declaratory judgment regarding its indemnification rights under the APA.

Spirit asserted a Counterclaim against Boeing, on the ground that the liabilities at issue were Boeing’s responsibility under the APA. Spirit’s Counterclaim alleges breach of contract and seeks a declaratory judgment regarding Spirit’s right to indemnification from Boeing under the APA. Spirit’s Counterclaim seeks to recover the amounts that Spirit spent litigating the Harkness Class Action, responding to Boeing’s indemnification demands concerning the Harkness Class Action and UAW Arbitration, and also litigating the current lawsuit against Boeing.

On December 20, 2016, Boeing and Spirit moved for summary judgment. On June 27, 2017, the Delaware Superior Court (the “Superior Court”) issued an order denying Boeing’s Motion for Summary Judgment and granting Spirit’s Motion for Summary Judgment, finding that the liabilities at issue were excluded liabilities under the APA and holding that Spirit is entitled to recover reasonable attorneys' fees, costs and other expenses from Boeing. The Court granted Spirit’s motion as to fees, costs, and expenses incurred as a result of the litigation and underlying matters and denied the motion as to pre- and post-trial interest.

Boeing appealed the Superior Court’s decision to the Supreme Court of the State of Delaware (the “Supreme Court”). On July 12, 2018, a unanimous three judge panel of the Supreme Court ruled in favor of Spirit and on July 26, 2018, the Supreme Court denied Boeing’s Motion for Reargument and returned the case to the Superior Court.  Spirit sought recovery of additional attorneys’ fees, costs, and other expenses incurred during the appellate process.  On August 22, 2018, the Superior Court granted Spirit’s motion.  Spirit has since recouped all amounts to which it was entitled by court order. This matter is now closed.

Contractual Terms Clarification. On July 6, 2018, Spirit filed a complaint in Washington Superior Court captioned Spirit AeroSystems, Inc. v. The Boeing Company (No. 18-2-16649-7  SEA).  Spirit is seeking payment of money that Boeing owes Spirit for product ordered by Boeing and delivered by Spirit. As of the date of filing the complaint, Boeing has underpaid Spirit approximately $64.0. Boeing claims to be withholding money due to customer warranty claims, which are technical in nature and largely relate to designs that predate Spirit’s separation from Boeing in 2005.  Spirit disputes its liability for those claims.  Spirit is also asking the court to clarify the parties’ contractual obligations, including that Boeing has no right under the parties’ contracts to withhold money presently due based on disputed warranty claims on past orders. On September 5, 2018, Boeing moved to dismiss three of Spirit’s claims without prejudice and one claim with prejudice. The parties are currently briefing this motion, and the Court has scheduled oral argument for November 16, 2018. Discovery in the case is ongoing.

Customer and Vendor Claims

From time to time the Company receives, or is subject to, customer and vendor claims arising in the ordinary course of business, including, but not limited to, those related to product quality and late delivery. The Company accrues for matters when losses are deemed probable and reasonably estimable. In evaluating matters for accrual and disclosure purposes, we take into consideration factors such as our historical experience with matters of a similar nature, the specific facts and circumstances asserted, the likelihood of an unfavorable outcome, and the severity of any potential loss. Any accruals deemed necessary are reevaluated and updated as matters progress over time.

On October 1, 2018, the Company received notice of a claim related to factory disruptions. Claims are inherently uncertain as they typically include many unsubstantiated items and factual disputes. As such, the Company does not believe it is possible to develop an estimate of reasonably possible loss for this matter. The Company has requested further information and supporting documentation and will continue to re-evaluate the claim. The Company usually resolves claims received in the ordinary course of business in the context of its broad, long-term relationships.

While the final outcome of these types of matters cannot be predicted with certainty, considering, among other things, the factual and legal defenses available, it is the opinion of the Company that, when finally resolved, no current claims will have a material adverse effect on the Company’s long-term financial position or liquidity. However, it is possible that the Company’s results of operations in a period could be materially affected by one or more of these other matters.

Guarantees

Outstanding guarantees were $18.8 and $23.2 as of September 27, 2018, and December 31, 2017, respectively.

Restricted Cash - Collateral Requirements

The Company was required to maintain $20.2 and $20.0 of restricted cash as of September 27, 2018 and December 31, 2017, respectively, related to certain collateral requirements for obligations under its workers’ compensation programs. The restricted cash is included in “Other assets” in the Company’s Condensed Consolidated Balance Sheets.

Indemnification

The Company has entered into customary indemnification agreements with its non-employee directors, and certain executive employment agreements include indemnification provisions. Under those agreements, the Company agrees to indemnify each of these individuals against claims arising out of events or occurrences related to that individual’s service as the Company’s agent or the agent of any of its subsidiaries to the fullest extent legally permitted.

The Company has agreed to indemnify parties for specified liabilities incurred, or that may be incurred, in connection with transactions they have entered into with the Company. The Company is unable to assess the potential number of future claims that may be asserted under these indemnities, nor the amounts thereof (if any). As a result, the Company cannot estimate the maximum potential amount of future payments under these indemnities and therefore, no liability has been recorded.

Service and Product Warranties and Extraordinary Rework

Provisions for estimated expenses related to service and product warranties and certain extraordinary rework are evaluated on a quarterly basis. These costs are accrued and are recorded to unallocated cost of goods sold. These estimates are established using historical information on the nature, frequency, and average cost of warranty claims, including the experience of industry peers. In the case of new development products or new customers, Spirit considers other factors including the experience of other entities in the same business and management judgment, among others. Service warranty and extraordinary rework is reported in current liabilities and other liabilities on the balance sheet.

The warranty balance presented in the table below includes unresolved warranty claims that are in dispute in regards to their value as well as their contractual liability. The Company estimated the total costs related to some of these claims, however, there is significant uncertainty surrounding the disposition of these disputed claims and as such, the ultimate determination of the provision’s adequacy requires significant management judgment. The amount of the specific provisions recorded against disputed, reasonably possible warranty claims was $104.3 and $101.0 as of September 27, 2018, and December 31, 2017, respectively. These specific provisions represent the Company’s best estimate of reasonably possible warranty claims. Should the Company incur higher than expected warranty costs and/or discover new or additional information related to these warranty provisions, the Company may incur additional charges that exceed these recorded provisions. The Company utilized available information to make appropriate assessments, however, the Company recognizes that data on actual claims experience is of limited duration and therefore, claims projections are subject to significant judgment. The amount of the warranty claims in excess of the disputed, reasonably possible specific warranty provision was $174.7 as of September 27, 2018, and $223.0 as of December 31, 2017.

The following is a roll forward of the service warranty and extraordinary rework balance at September 27, 2018:

Balance, December 31, 2017	$	166.4
Charges to costs and expenses	7.2
Payouts	(3.7		)
Exchange rate	(0.5		)
Balance, September 27, 2018	$	169.4

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Subsequent Event (Notes)

9 Months Ended

Sep. 27, 2018

Subsequent Event [Line Items]

Business Combination Disclosure [Text Block]

23.  Asco Acquisition

On May 1, 2018, the Company and its wholly-owned subsidiary Spirit Belgium entered into the Purchase Agreement pursuant to which Spirit Belgium will purchase all of the issued and outstanding equity of Asco, a leading supplier of high lift wing structures, mechanical assemblies and major functional components to major OEMs and Tier I suppliers in the global commercial aerospace and military markets, for the translated amount of $650.0 in cash, subject to certain customary closing adjustments, including foreign currency adjustments. The definitive agreement is subject to customary closing conditions, including regulatory approvals and customer consents.

One of the closing conditions is receipt of clearance from the European Commission (the “Commission”). During the scope of the Commission’s Phase 1 review, the Commission identified issues that it requires to be addressed regarding the transaction. Consequently, on October 26, 2018, the Company withdrew its notification of the transaction from the Commission in order to address those issues. The withdrawal interrupts the Commission’s current review of the transaction. The Company and Asco will work to refile the notification in a timely manner.

Acquisition-related expenses were $14.8 for the nine months ended September 27, 2018 and are included in selling, general and administrative costs on the condensed and consolidated statements of operations.

The foregoing description of the Purchase Agreement does not purport to be complete and is qualified in its entirety by reference to the description set forth in the Company’s Current Report on Form 8-K filed with the SEC on May 2, 2018, and the full text of the Purchase Agreement, which was filed as an exhibit to the Company's Form 10-Q filed with the SEC on August 1, 2018.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 27, 2018

Accounting Policies [Abstract]

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

The preparation of the Company's financial statements in conformity with GAAP requires management to use estimates and assumptions. The results of these estimates form the basis for making judgments that may affect the reported amounts of assets and liabilities, including the impacts of contingent assets and liabilities, and the reported amounts of revenue and expenses during the reporting period.

Management may make significant judgments when assessing estimated amounts of variable consideration and related constraints, the number of options likely to be exercised, and the standalone selling prices of the Company’s products and services. The Company also estimates the cost of satisfying the performance obligations in its contracts and options that may extend over many years. Cost estimates reflect currently available information and the impact of any changes to cost estimates, based upon the facts and circumstances, are recorded in the period in which they become known.

The transaction price for a contract reflects the consideration the Company expects to receive for fully satisfying the performance obligations in the contract. The Company’s contracts with customers are typically for products and services to be provided at fixed stated prices but may also include variable consideration. Variable consideration may include, but is not limited to, unpriced contract modifications, cost sharing provisions, incentives and awards, non-warranty claims and assertions, provisions for non-conformance and rights to return, or other payments to, or receipts from, customers and suppliers. The Company estimates the variable consideration using the expected value or the most likely amount based upon the facts and circumstances, available data and trends and the history of resolving variability with specific customers and suppliers.

The Company regularly commences work and incorporates customer-directed changes prior to negotiating pricing terms for engineering work, product modifications, and other statements of work. The Company's contractual terms typically provide for price negotiations after certain customer-directed changes have been accepted by the Company. Prices are estimated until they are contractually agreed upon with the customer. When a contract is modified, the Company evaluates whether additional distinct products and services have been promised and whether allocation of consideration is necessary. If not, the modification is treated as a change to the performance obligations within the existing contract, or otherwise accounted for as a new contract prospectively.

The Company allocates the consideration for a contract to the performance obligations on the basis of their relative standalone selling price. The Company estimates the likelihood of the amount of options that the customer is going to exercise when assessing the existence of performance obligations with respect to this allocation or for assessing the impact of loss contracts.

The Company typically provides warranties on all the Company's products and services. Generally, warranties are not priced separately because customers cannot purchase them independently of the products or services under contract so they do not create performance obligations. Spirit warranties generally provide assurance to the Company's customers that the products or services meet the specifications in the contract. In the event that there is a warranty claim because of a covered design, material or workmanship issue, the Company may be required to redesign or modify the product, offer concessions, and/or pay the customer for repairs or perform the repair. Provisions for estimated expenses related to design, service, and product warranties and certain extraordinary rework are made at the time products are sold. These costs are accrued at the time of the sale and are recorded as unallocated cost of sales. These estimates are established using historical information on the nature, frequency, and the cost experience of warranty claims, including the experience of industry peers. In the case of new development products or new customers, Spirit also considers factors including the warranty experience of other entities in the same business, management judgment, and the type and nature of the new product or new customer, among others.

Actual results could differ from those estimates and assumptions.

Revenue Recognition, Policy [Policy Text Block]

Revenues and Profit Recognition

Substantially all of the Company’s revenues are from long-term supply agreements with Boeing, Airbus, and other aerospace manufacturers. The Company participates in its customers’ programs by providing design, development, manufacturing, fabrication, and support services for major aerostructures in the fuselage, propulsion, and wing segments. During the early stages of a program, this frequently involves nonrecurring design and development services, including tooling. As the program matures, the Company provides recurring manufacturing of products in accordance with customer design and schedule requirements. Many contracts include clauses that provide sole supplier status to the Company for the duration of the program’s life (including derivatives). The Company's long-term supply agreements typically include fixed price volume-based terms and require the satisfaction of performance obligations for the duration of the program’s life.

The identification of an accounting contract with a customer and the related promises require an assessment of each party’s rights and obligations regarding the products or services to be transferred, including an evaluation of termination clauses and presently enforceable rights and obligations. In general, these long-term supply agreements are legally governed by Master Supply Agreements (or General Terms and Agreements) together with special business provisions (or work package agreements), which define specific program requirements. Purchase orders (or authorizations to proceed) are issued under these agreements to reflect presently enforceable rights and obligations for the units of products and services being purchased. The units for accounting purposes (“accounting contract”) is typically determined by the purchase orders. Revenue is recognized when the Company has a contract with presently enforceable rights and obligations, including an enforceable right to payment for work performed. These agreements may lead to continuing sales of more than twenty years. Customers generally contract with the Company for requirements in a segment relating to a specific program, and the Company’s performance obligations consist of a wide range of engineering design services and manufactured structural components, as well as spare parts and repairs for OEMs. A single program may result in multiple contracts for accounting purposes, and within the respective contracts, non-recurring work elements and recurring work elements may result in multiple performance obligations. The Company generally contracts directly with its customers and is the principal in all current contracts.

Management considers a number of factors when determining the existence of a contract and the related performance obligations that include, but are not limited to, the nature and substance of the business exchange, the contractual terms and conditions, the promised products and services, the termination provisions in the contract, including the presently enforceable rights and obligations of the parties to the contract, the nature and execution of the customer’s ordering process and how the Company is authorized to perform work, whether the promised products and services are distinct or capable of being distinct within the context of the contract, as well as how and when products and services are transferred to the customer.

Revenue is recognized when, or as, control of promised products or services transfers to a customer and is recognized in an amount that reflects the consideration that the Company expects to receive in exchange for those products or services. Revenue is recognized over time as work progresses when the Company is entitled to the reimbursement of costs plus a reasonable profit for work performed for which the Company has no alternate use. For these performance obligations that are satisfied over time, the Company generally recognizes revenue using an input method with revenue amounts being recognized proportionately as costs are incurred relative to the total expected costs to satisfy the performance obligation. The Company believes that costs incurred as a portion of total estimated costs is an appropriate measure of progress towards satisfaction of the performance obligation since this measure reasonably depicts the progress of the work effort.

Revenue for performance obligations that are not recognized over time are recognized at the point in time when control transfers to the customer (which is generally upon delivery). For performance obligations that are satisfied at a point in time, the Company evaluates the point in time when the customer can direct the use of, and obtain the benefits from, the products and services. Shipping and handling costs are not considered performance obligations and are included in cost of sales as incurred.

The transaction price for a contract reflects the consideration the Company expects to receive for fully satisfying the performance obligations in the contract. The Company’s current contracts do not include any significant financing components because the timing of the transfer of the underlying products and services under contract are at the customers’ discretion. The Company's contracts with customers generally require payment under normal commercial terms after delivery. Payment terms are typically within 30 to 120 days of delivery. The total transaction price is allocated to each of the identified performance obligations using the relative standalone selling price to reflect the amount the Company expects to be entitled for transferring the promised products and services to the customer. A majority of the Company’s agreements with customers include options for future purchases. For the purposes of allocating transaction price, the Company assesses, based upon the facts and circumstances of the business arrangement, the amount and likelihood of options to be exercised that may result in deferral of revenue to future contracts and options. Deferred revenues are recognized as, or when, the underlying future performance obligations are satisfied.

Standalone selling price is the price at which the Company would sell a promised good or service separately to a customer. Standalone selling prices are established at contract inception and subsequent changes in transaction price are allocated on the same basis as at contract inception. Standalone selling prices for the Company’s products and services are generally not observable and the Company uses the “Expected Cost plus a Margin” approach to determine standalone selling price. Expected costs are typically derived from the available periodic forecast information. If a contract modification changes the overall transaction price of an existing contract, the Company allocates the new transaction price on the basis of the relative standalone selling prices of the performance obligations and cumulative adjustments, if any, are recorded in the current period.

The Company also identifies and estimates variable consideration for contractual provisions such as unpriced contract modifications, cost sharing provisions, incentives and awards, non-warranty claims and assertions, provisions for non-conformance and rights to return, or other payments to, or receipts from, customers and suppliers. The timing of satisfaction of performance obligations and actual receipt of payment from a customer may differ and affects the balances of the contract assets and liabilities.

For contracts that are deemed to be loss contracts, the Company establishes forward loss reserves for total estimated costs that are in excess of total estimated consideration in the period in which they become known. These reserves are based on estimates for accounting contracts, plus options that the Company believes are likely to be exercised. The Company records forward loss reserves for all performance obligations in the aggregate for the accounting contract.

Disaggregation of Revenue

The Company disaggregates revenue based on the method of measuring satisfaction of the performance obligation either over time or at a point in time, and determining whether the accounting contract is a short duration or long duration contract. Short duration contracts are those for which the performance obligations are expected to be fully satisfied within 12 months of contract origination. The number of units and the production schedule is used to make this assessment. Additionally, the Company disaggregates revenue based upon the location where products and services are transferred to the customer. The Company’s principal operating segments and related revenue are noted in Note 22, Segment Information.

The following table disaggregates revenues by the method of performance obligation satisfaction:

	For the Three Months Ended		For the Nine Months Ended
Revenue	September 27, 2018		September 27, 2018
Contracts with performance obligations satisfied over time	$	1,456.7	$	4,212.6
Contracts with performance obligations satisfied at a point in time	357.0		1,174.1
Total Revenue	$	1,813.7	$	5,386.7

The following table disaggregates revenue by major customer:

	For the Three Months Ended		For the Nine Months Ended
Customer	September 27, 2018		September 27, 2018
Boeing	$	1,465.5	$	4,262.2
Airbus	263.8		869.0
Other	84.4		255.5
Total Revenue	$	1,813.7	$	5,386.7

The following table disaggregates revenue based upon the location where control of products are transferred to the customer:

	For the Three Months Ended		For the Nine Months Ended
Location	September 27, 2018		September 27, 2018
United States	$	1,534.0	$	4,460.8
International
United Kingdom	184.4		574.1
Other	95.3		351.8
Total International	279.7		925.9
Total Revenue	$	1,813.7	$	5,386.7

Inventory, Policy [Policy Text Block]

Inventory

Raw materials are stated at lower of cost (principally on an actual or average cost basis) or market. Production costs for contracts, including costs expected to be recovered on specific anticipated contracts (satisfaction of performance obligations that have commenced because the Company expects the customer to exercise options), are classified as work-in-process and include direct material, labor, overhead, and purchases. Revenue and related cost of sales are recognized as the performance obligations are satisfied. Typically, anticipated contracts materialize and the related performance obligations are satisfied within 6-12 months. These costs are evaluated for impairment periodically and capitalized costs for which anticipated contracts do not materialize are written off in the period in which it becomes known. Work-in-process includes $152.9 in costs incurred in anticipation of specific future contracts and no impairments were charged for the period ending September 27, 2018. See Note 9, Inventory.

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New Accounting Pronouncements (Policies)

9 Months Ended

Sep. 27, 2018

Accounting Policies [Abstract]

New Accounting Pronouncements, Policy [Policy Text Block]

4.  New Accounting Pronouncements

In August 2018, the FASB issued ASU No. 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Topic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans (“ASU 2018-14”), which modifies the disclosure requirements for defined benefit pension plans and other postretirement plans. ASU 2018-14 is effective for fiscal years beginning after December 15, 2020, with early adoption permitted. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework — Changes to the Disclosure Requirements for Fair Value Measurement” (“ASU 2018-13”), which modifies the disclosure requirements on fair value measurements by removing, modifying, or adding certain disclosures. Certain disclosures in ASU 2018-13 are required to be applied on a retrospective basis and others on a prospective basis. ASU 2018-13 is effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company is currently evaluating the potential impact of adopting this guidance on our consolidated financial statements.

In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220)(“ASU 2018-02”). The guidance in ASU 2018-02 allows an entity to elect to reclassify the stranded tax effects related to the Tax Cuts and Jobs Act of 2017 (the “TCJA”) from accumulated other comprehensive income into retained earnings. ASU 2018-02 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company does not expect the adoption of this standard to have a material effect to the Company’s consolidated financial statements.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”), which expands component and fair value hedging, specifies the presentation of the effects of hedging instruments, and eliminates the separate measurement and presentation of hedge ineffectiveness. ASU 2017-12 is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company adopted ASU 2017-12 as of January 1, 2018. The adoption of ASU 2017-12 did not have a material impact to the Company’s consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”). This update requires recognition of lease assets and lease liabilities on the balance sheet of lessees. ASU 2016-02 is effective for fiscal years and interim reporting periods within those years beginning after December 15, 2018. Early adoption is permitted. ASU 2016-02 requires a modified retrospective transition approach and provides certain optional transition relief. The Company is progressing through its implementation plan and continue to evaluate the impact of the standard on its business processes, accounting systems, controls and financial statement disclosures, however the Company does not expect the adoption of this standard to have a material effect to the Company’s consolidated financial statements.

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Adoption of New Standard (Tables)

9 Months Ended

Sep. 27, 2018

Item Effected [Line Items]

Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block]

	For the Three  Months Ended									For the Nine  Months Ended
	As Reported			Impact of Adoption of			As Adjusted			As Reported			Impact of Adoption of			As Adjusted
	September 27, 2018			ASC Topic 606			September 27, 2018			September 27, 2018			ASC Topic 606			September 27, 2018
Revenue	$	1,813.7		$	15.9		$	1,829.6		$	5,386.7		$	106.6		$	5,493.3
Cost of sales	1,543.1			68.2			1,611.3			4,601.3			207.7			4,809.0
Income tax provision	(36.9		)	10.6			(26.3		)	(99.7		)	20.9			(78.8		)
Net income	168.8			(41.7		)	127.1			439.4			(80.2		)	359.2
Earnings per share
Basic	$	1.61		$	(0.40	)	$	1.21		$	4.02		$	(0.73	)	$	3.29
Diluted	$	1.59		$	(0.39	)	$	1.20		$	3.98		$	(0.72	)	$	3.26

	As Reported			Impact of Adoption of			As Adjusted
	September 27, 2018			ASC Topic 606			September 27, 2018
Assets
Accounts receivable, net	$	685.1		$	131.0		$	816.1
Contract assets, short-term	513.2			(513.2		)	—
Inventory, net	931.0			445.2			1,376.2
Other current assets	35.4			36.1			71.5
Contract assets, long-term	53.5			(53.5		)	—
Other assets	284.9			(78.5		)	206.4
Total assets	5,682.1			(32.9		)	5,649.2
Liabilities
Accrued expenses	354.0			(7.1		)	346.9
Contract liabilities, short-term	153.5			(153.5		)	—
Forward loss provision, short-term	147.3			(147.3		)	—
Deferred revenue and other deferred credits, short-term	7.1			144.9			152.0
Other current liabilities	68.8			290.8			359.6
Contract liabilities, long-term	353.8			(353.8		)	—
Forward loss provision, long-term	72.6			(72.6		)	—
Deferred revenue and other deferred credits	26.8			71.5			98.3
Stockholders' Equity
Accumulated other comprehensive loss	(145.0		)	(2.2		)	(147.2		)
Retained earnings	2,548.7			196.4			2,745.1
Total liabilities and equity	5,682.1			(32.9		)	5,649.2

Accounting Standards Update 2017-07 [Member]

Item Effected [Line Items]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

	For the Three Months Ended						For the Nine Months Ended
	As Reported		Impact of Adoption of		As Adjusted		As Reported		Impact of Adoption of		As Adjusted
	September 28, 2017		ASU 2017-07		September 28, 2017		September 28, 2017		ASU 2017-07		September 28, 2017
Cost of sales	$	1,478.5	$	8.1	$	1,486.6	$	4,738.3	$	24.5	$	4,762.8
Selling, general and administrative	48.8		1.0		49.8		146.8		3.1		149.9
Other income, net	1.9		9.1		11.0		4.6		27.6		32.2

Accounting Standards Update 2016-18 [Member]

Item Effected [Line Items]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

Reconciliation of Cash, Cash Equivalents, and Restricted Cash:
	For the Nine Months Ended
	September 27, 2018		September 28, 2017
Cash and cash equivalents, beginning of the period	$	423.3	$	697.7
Restricted cash, short-term, beginning of the period	2.2		—
Restricted cash, long-term, beginning of the period	20.0		19.9
Cash, cash equivalents, and restricted cash, beginning of the period	$	445.5	$	717.6
Cash and cash equivalents, end of the period	$	683.4	$	726.6
Restricted cash, short-term, end of the period	0.3		3.2
Restricted cash, long-term, end of the period	20.2		20.0
Cash, cash equivalents, and restricted cash, end of the period	$	703.9	$	749.8

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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 27, 2018

Sep. 28, 2017

Disaggregation of Revenue [Abstract]

Disaggregation of Revenue [Table Text Block]

The following table disaggregates revenues by the method of performance obligation satisfaction:

	For the Three Months Ended		For the Nine Months Ended
Revenue	September 27, 2018		September 27, 2018
Contracts with performance obligations satisfied over time	$	1,456.7	$	4,212.6
Contracts with performance obligations satisfied at a point in time	357.0		1,174.1
Total Revenue	$	1,813.7	$	5,386.7

The following table disaggregates revenue by major customer:

	For the Three Months Ended		For the Nine Months Ended
Customer	September 27, 2018		September 27, 2018
Boeing	$	1,465.5	$	4,262.2
Airbus	263.8		869.0
Other	84.4		255.5
Total Revenue	$	1,813.7	$	5,386.7

The following table disaggregates revenue based upon the location where control of products are transferred to the customer:

	For the Three Months Ended		For the Nine Months Ended
Location	September 27, 2018		September 27, 2018
United States	$	1,534.0	$	4,460.8
International
United Kingdom	184.4		574.1
Other	95.3		351.8
Total International	279.7		925.9
Total Revenue	$	1,813.7	$	5,386.7

	For the Three Months Ended		For the Nine Months Ended
Revenue	September 27, 2018		September 27, 2018
Contracts with performance obligations satisfied over time	$	1,456.7	$	4,212.6
Contracts with performance obligations satisfied at a point in time	357.0		1,174.1
Total Revenue	$	1,813.7	$	5,386.7

The following table disaggregates revenue by major customer:

	For the Three Months Ended		For the Nine Months Ended
Customer	September 27, 2018		September 27, 2018
Boeing	$	1,465.5	$	4,262.2
Airbus	263.8		869.0
Other	84.4		255.5
Total Revenue	$	1,813.7	$	5,386.7

The following table disaggregates revenue based upon the location where control of products are transferred to the customer:

	For the Three Months Ended		For the Nine Months Ended
Location	September 27, 2018		September 27, 2018
United States	$	1,534.0	$	4,460.8
International
United Kingdom	184.4		574.1
Other	95.3		351.8
Total International	279.7		925.9
Total Revenue	$	1,813.7	$	5,386.7

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Changes in Estimates Changes in Estimates (Tables)

9 Months Ended

Sep. 27, 2018

Accounting Changes and Error Corrections [Abstract]

Schedule of Change in Accounting Estimate [Table Text Block]

Changes in estimates are summarized below:

	For the Three Months Ended						For the Nine Months Ended
Changes in Estimates	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
(Unfavorable) Favorable Cumulative Catch-up Adjustment by Segment
Fuselage Systems	$	(12.0	)	$	(2.4	)	$	(3.0	)	$	5.3
Propulsion Systems	(2.4		)	2.4			0.9			4.3
Wing Systems	1.4			(2.8		)	0.9			19.1
Total (Unfavorable) Favorable Cumulative Catch-up Adjustment	$	(13.0	)	$	(2.8	)	$	(1.2	)	$	28.7
(Forward Loss) Changes in Estimate on Loss Programs by Segment
Fuselage Systems	$	—		$	(0.9	)	$	(1.5	)	$	(238.5	)
Propulsion Systems	(0.8		)	1.3			—			(46.7		)
Wing Systems	0.3			(2.4		)	(0.2		)	(74.4		)
Total Forward Loss	$	(0.5	)	$	(2.0	)	$	(1.7	)	$	(359.6	)
Total Change in Estimate	$	(13.5	)	$	(4.8	)	$	(2.9	)	$	(330.9	)
EPS Impact (diluted per share based upon statutory rates)	$	(0.10	)	$	(0.03	)	$	(0.02	)	$	(1.75	)

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Accounts Receivable, net (Tables)

9 Months Ended

Sep. 27, 2018

Accounts Receivable, Net, Current [Abstract]

Accounts Receivable, Net

Accounts receivable, net consists of the following:

	September 27, 2018			December 31, 2017
Trade receivables	$	660.0		$	710.5
Other	25.7			13.0
Less: allowance for doubtful accounts	(0.6		)	(1.3		)
Accounts receivable, net	$	685.1		$	722.2

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Performance Obligations (Tables)

9 Months Ended

Sep. 27, 2018

Revenue from Contract with Customer [Abstract]

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

	Remaining in 2018	2019	2020	2021 and After
Unsatisfied performance obligations	$1,320.4	$6,302.7	$5,680.9	$1,648.3

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Inventory (Tables)

9 Months Ended

Sep. 27, 2018

Inventory Disclosure [Abstract]

Summary Of Inventories

Inventories are summarized as follows:

	September 27, 2018		December 31, 2017
Raw materials	$	251.3	$	321.0
Work-in-process(1)	631.0		854.4
Finished goods	8.9		35.8
Product inventory	891.2		1,211.2
Capitalized pre-production(2)	39.8		78.9
Deferred production(3)	—		640.3
Forward loss provision(4)	—		(480.5		)
Total inventory, net	$	931.0	$	1,449.9

(1) For the period ended September 27, 2018, work-in-process inventory includes direct labor, direct material, overhead and purchases on contracts for which revenue is recognized at a point in time as well as sub-assembly parts that have not been issued to production on contracts for which revenue is recognized using the input method. For the period ended December 31, 2017, work-in-process included direct labor, direct material, overhead and purchases on all contracts that were accounted for using the units of delivery method. For the period ended September 27, 2018, work-in-process inventory includes $152.9 of costs incurred in anticipation of specific contracts and no impairments were recorded in the period.

(2) As part of the Transition Adjustment, $43.0 (pretax) of pre-production costs on the A350 XWB were eliminated.

(3) As part of the Transition Adjustment, $640.3 (pretax) of deferred production was eliminated. For the period ended December 31, 2017, the balance contained $632.8 and $129.3 on the A350 XWB and Rolls-Royce BR725 programs, respectively.

(4) For the period ended September 27, 2018, forward loss reserves of $219.9 have been classified as a liability in the condensed consolidated balance sheet. For the period ended December 31, 2017, the forward loss reserve for the B787 program exceeded the program's inventory balance. This excess was classified as a liability and reported in other current liabilities on the balance sheet in the amount of $254.5 as of December 31, 2017.

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Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 27, 2018

Property, Plant and Equipment [Abstract]

Property, plant and equipment, net

Property, plant and equipment, net consists of the following: 

	September 27, 2018			December 31, 2017
Land	$	15.5		$	15.9
Buildings (including improvements)	813.3			764.1
Machinery and equipment	1,630.3			1,529.9
Tooling	1,027.2			1,013.9
Capitalized software	269.2			263.3
Construction-in-progress	212.5			213.4
Total	3,968.0			3,800.5
Less: accumulated depreciation	(1,845.0		)	(1,695.2		)
Property, plant and equipment, net	$	2,123.0		$	2,105.3

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 27, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

The guidance discloses three levels of inputs that may be used to measure fair value:

Level 1 Quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt and equity securities and derivative contracts that are traded in an active exchange market.

Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 2 assets and liabilities include debt securities with quoted prices that are traded less frequently than exchange-traded instruments and derivative contracts whose value is determined using a pricing model with inputs that are observable in the market or can be derived principally from or corroborated by observable market data. Observable inputs, such as current and forward interest rates and foreign exchange rates, are used in determining the fair value of the interest rate swaps and foreign currency hedge contracts.

Level 3 Unobservable inputs that are supported by little or no market activity and are significant to the fair value of assets and liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation.

Carrying Amount And Estimated Fair Value Of Long Term Debt

The following table presents the carrying amount and estimated fair value of long-term debt:

	September 27, 2018					December 31, 2017
	Carrying Amount		Fair Value			Carrying Amount		Fair Value
Senior unsecured term loan A (including current portion)	$	204.9	$	204.7	(2)	$	460.7	$	461.9	(2)
Senior unsecured notes due 2021	298.4		299.0		(1)	—		—		(1)
Senior unsecured notes due 2022	—		—		(1)	294.8		304.6		(1)
Senior unsecured notes due 2023	297.8		296.8		(1)	—		—		(1)
Senior unsecured notes due 2026	297.5		284.3		(1)	297.2		301.0		(1)
Senior unsecured notes due 2028	693.3		689.4		(1)	—		—		(1)
Total	$	1,791.9	$	1,774.2		$	1,052.7	$	1,067.5

(1) Level 1 Fair Value hierarchy

(2) Level 2 Fair Value hierarchy

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Other Assets (Tables)

9 Months Ended

Sep. 27, 2018

Other Assets, Noncurrent [Abstract]

Other Assets

Other assets are summarized as follows:

	September 27, 2018			December 31, 2017
Intangible assets
Patents	$	1.9		$	1.9
Favorable leasehold interests	6.3			6.3
Total intangible assets	8.2			8.2
Less: Accumulated amortization - patents	(1.9		)	(1.8		)
Accumulated amortization - favorable leasehold interest	(4.8		)	(4.6		)
Intangible assets, net	1.5			1.8
Deferred financing
Deferred financing costs	41.7			39.5
Less: Accumulated amortization - deferred financing costs	(35.3		)	(33.7		)
Deferred financing costs, net	6.4			5.8
Other
Goodwill - Europe	2.4			2.5
Equity in net assets of affiliates	—			4.7
Supply agreements(1)	16.3			19.9
Restricted cash - collateral requirements	20.2			20.0
Deferred Tax Asset - non-current	194.9			72.5
Other	43.2			37.1
Total	$	284.9		$	164.3

(1)    Under two agreements, certain payments accounted for as consideration paid by the Company to a customer and a supplier are being amortized as reductions to net revenues.

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Debt (Tables)

9 Months Ended

Sep. 27, 2018

Debt Disclosure [Abstract]

Long Term Debt And Capital Lease Obligations Current And Non Current

Total debt shown on the balance sheet is comprised of the following: 

	September 27, 2018				December 31, 2017
	Current		Noncurrent		Current		Noncurrent
Senior unsecured term loan A	$	17.1	$	187.8	$	24.9	$	435.8
Senior notes due 2021	—		298.4		—		—
Senior notes due 2022	—		—		—		294.8
Senior notes due 2023	—		297.8		—		—
Senior notes due 2026	—		297.5		—		297.2
Senior notes due 2028	—		693.3		—		—
Present value of capital lease obligations	6.9		36.3		5.2		33.6
Other	1.0		58.6		1.0		58.5
Total	$	25.0	$	1,869.7	$	31.1	$	1,119.9

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Pension and Other Post-Retirement Benefits (Tables)

9 Months Ended

Sep. 27, 2018

Defined Benefit Plan [Abstract]

Change in projected benefit obligations

.Pension and Other Post-Retirement Benefits

	Defined Benefit Plans
	For the Three Months Ended						For the Nine Months Ended
Components of Net Periodic Pension Income	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Service cost	$	0.2		$	0.2		$	0.6		$	0.7
Interest cost	9.2			9.4			27.4			28.3
Expected return on plan assets	(17.4		)	(18.2		)	(52.3		)	(54.6		)
Amortization of net loss	—			0.1			—			0.1
Net periodic pension income	$	(8.0	)	$	(8.5	)	$	(24.3	)	$	(25.5	)

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Equity (Tables)

9 Months Ended

Sep. 27, 2018

Stockholders' Equity Note [Abstract]

Basic and Diluted Earnings per share

The following table sets forth the computation of basic and diluted earnings per share:

	For the Three Months Ended
	September 27, 2018					September 28, 2017
	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Basic EPS
Income available to common stockholders	$	168.7	105.1	$	1.61	$	147.1	115.8	$	1.27
Income allocated to participating securities	0.1		0.1			0.1		0.1
Net income	$	168.8				$	147.2
Diluted potential common shares			0.9					1.1
Diluted EPS
Net income	$	168.8	106.1	$	1.59	$	147.2	117.0	$	1.26

	For the Nine Months Ended
	September 27, 2018					September 28, 2017
	Income		Shares	Per Share Amount		Income		Shares	Per Share Amount
Basic EPS
Income available to common shareholders	$	439.1	109.3	$	4.02	$	231.9	117.8	$	1.97
Income allocated to participating securities	0.3		0.1			0.2		0.1
Net income	$	439.4				$	232.1
Diluted potential common shares			0.9					1.1
Diluted EPS
Net income	$	439.4	110.3	$	3.98	$	232.1	119.0	$	1.95

Schedule of Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Loss is summarized by component as follows:

	As of			As of
	September 27, 2018			December 31, 2017
Pension	$	(76.0	)	$	(75.9	)
SERP/Retiree medical	16.0			17.7
Foreign currency impact on long term intercompany loan	(15.5		)	(14.2		)
Currency translation adjustment	(69.5		)	(56.1		)
Total accumulated other comprehensive loss	$	(145.0	)	$	(128.5	)

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Equity Accelerated Share Repurchase (Tables) - USD ($)
shares in Thousands, $ in Millions

3 Months Ended

9 Months Ended

Sep. 27, 2018

Sep. 27, 2018

Accelerated Share Repurchases [Line Items]

Accelerated Share Repurchases [Table Text Block]

Accelerated Share Repurchase Program

In May 2018, the Company entered into accelerated share repurchase agreements (“ASRs”) with Morgan Stanley & Co. LLC and Goldman Sachs & Co. LLC (collectively, the “Dealers”) to repurchase in total $725.0 of the Company’s class A common stock. Under the ASRs, the Company delivered a total of $725.0 in cash to the Dealers and received a total of 7.3 million shares which represented approximately 85% of the total common shares expected to be repurchased under the ASRs based on the closing price on the day the Company entered into the ASRs. The final number of shares to be repurchased and the final average price per share under the ASRs will depend on the volume-weighted average price of the Company’s class A common stock, less a discount, during the term of the agreement. All purchases under the ASRs are expected to be completed in the fourth quarter of 2018.

For further information regarding the ASRs, refer to the Company's Current Report on Form 8-K filed with the SEC on May 30, 2018.

The Company accounts for the ASRs as two separate transactions: (i) as shares of reacquired common stock for the shares delivered to us upon effectiveness of the ASRs and (ii) as a forward contract indexed to the Company's own common stock for the undelivered shares. The initial delivery of shares is included in treasury stock at cost and results in an immediate reduction of the outstanding shares used to calculate the weighted average common shares outstanding for basic and diluted earnings per share. The forward contracts indexed to the Company's own common stock meet the criteria for equity classification, and these amounts are initially recorded in additional paid-in capital and reclassified to treasury stock upon completion of the ASRs.

Accelerated Share Repurchase - Initial Share Delivery [Member]

Accelerated Share Repurchases [Line Items]

Treasury Stock, Shares, Acquired

7,300

Accelerated Share Repurchase Program [Member]

Accelerated Share Repurchases [Line Items]

Treasury Stock, Value, Acquired, Cost Method

$ 725.0

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Other Income (Expense), Net (Tables)

9 Months Ended

Sep. 27, 2018

Other Nonoperating Income (Expense) [Abstract]

Other Income Expense Net

Other (expense) income, net is summarized as follows:

	For the Three Months Ended						For the Nine Months Ended
	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Kansas Development Finance Authority bond	$	0.8		$	0.6		$	2.9		$	2.3
Rental and miscellaneous income (loss)	0.6			1.6			(0.7		)	0.2
Interest income	2.1			1.9			5.0			4.4
Foreign currency losses	(1.8		)	(1.1		)	(3.3		)	(1.2		)
Loss on sale of accounts receivable	(4.0		)	—			(12.3		)	—
Pension Income	8.6			9.1			25.7			27.6
Gain (loss) on foreign currency forward contract, net of settlement	0.8			—			(20.7		)	—
Gain (loss) on interest rate swaps, net of settlement	0.3			(1.1		)	2.6			(1.1		)
Total	$	7.4		$	11.0		$	(0.8	)	$	32.2

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Segment Information (Tables)

9 Months Ended

Sep. 27, 2018

Segment Reporting [Abstract]

Segment Information

The following table shows segment revenues and operating income for the three and nine months ended September 27, 2018, and September 28, 2017:

	Three Months Ended						Nine Months Ended
	September 27, 2018			September 28, 2017			September 27, 2018			September 28, 2017
Segment Revenues
Fuselage Systems	$	991.0		$	957.0		$	2,983.4		$	2,812.1
Propulsion Systems	442.4			407.9			1,259.6			1,250.7
Wing Systems	378.6			382.2			1,138.6			1,201.7
All Other	1.7			1.1			5.1			3.9
	$	1,813.7		$	1,748.2		$	5,386.7		$	5,268.4
Segment Operating Income (Loss)
Fuselage Systems (1)	$	134.8		$	143.8		$	417.7		$	205.0
Propulsion Systems (1)	76.2			72.4			203.9			183.4
Wing Systems (1)	58.6			49.1			166.1			134.7
All Other	1.3			0.2			0.3			(0.5		)
	270.9			265.5			788.0			522.6
SG&A	(37.3		)	(49.8		)	(154.5		)	(149.9		)
Impact of severe weather event	—			—			—			(19.9		)
Research and development	(10.8		)	(9.5		)	(31.3		)	(21.2		)
Unallocated cost of sales	(0.3		)	(3.9		)	(2.6		)	(17.0		)
Total operating income	$	222.5		$	202.3		$	599.6		$	314.6

(1) Prior period information has been reclassified as a result of the Company's adoption of ASU 2017-07 on a retrospective basis in 2018. In accordance with the adoption of this guidance, prior year amounts related to the components of net periodic pension and postretirement benefit cost other than service costs have been reclassified from cost of sales and selling, general and administrative expense to other income (expense) within the consolidated statement of operations for all periods presented. Accordingly, expenses of $4.5, $1.8, and $1.8 on the Fuselage, Systems Propulsion Systems, and Wing Systems, respectively, were reclassified into segment operating income for the three months ended September 28, 2017 and expenses of $13.5, $5.5, and $5.5 on the Fuselage Systems, Propulsion Systems, and Wing Systems, respectively, were reclassified into segment operating income for the nine months ended September 28, 2017.

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Condensed Consolidating Financial Information (Tables)

9 Months Ended

Sep. 27, 2018

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Income Statement

Condensed Consolidating Statements of Operations

For the Three Months Ended September 27, 2018

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenue	$	—		$	1,636.1		$	305.6		$	(128.0	)	$	1,813.7
Operating costs and expenses
Cost of sales	—			1,395.9			275.2			(128.0		)	1,543.1
Selling, general and administrative	2.3			31.4			3.6			—			37.3
Research and development	—			9.2			1.6			—			10.8
Total operating costs and expenses	2.3			1,436.5			280.4			(128.0		)	1,591.2
Operating (loss) income	(2.3		)	199.6			25.2			—			222.5
Interest expense and financing fee amortization	—			(24.2		)	(1.2		)	1.2			(24.2		)
Other income (expense), net	—			9.6			(1.0		)	(1.2		)	7.4
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(2.3		)	185.0			23.0			—			205.7
Income tax benefit (provision)	0.4			(33.7		)	(3.6		)	—			(36.9		)
(Loss) income before equity in net income of affiliate and subsidiaries	(1.9		)	151.3			19.4			—			168.8
Equity in net income of affiliate	—			—			—			—			—
Equity in net income of subsidiaries	170.7			19.4			—			(190.1		)	—
Net income	168.8			170.7			19.4			(190.1		)	168.8
Other comprehensive (loss) income	(0.6		)	(0.6		)	0.1			0.5			(0.6		)
Comprehensive income (loss)	$	168.2		$	170.1		$	19.5		$	(189.6	)	$	168.2

Condensed Consolidating Statements of Operations

For the Three Months Ended September 28, 2017

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenue	$	—		$	1,573.0		$	311.8		$	(136.6	)	$	1,748.2
Operating costs and expenses
Cost of sales	—			1,339.2			284.0			(136.6		)	1,486.6
Selling, general and administrative	3.9			42.3			3.6			—			49.8
Impact of severe weather event	—			—			—			—			—
Research and development	—			8.8			0.7			—			9.5
Total operating costs and expenses	3.9			1,390.3			288.3			(136.6		)	1,545.9
Operating (loss) income	(3.9		)	182.7			23.5			—			202.3
Interest expense and financing fee amortization	—			(10.5		)	(1.3		)	1.4			(10.4		)
Other income (expense), net	—			13.1			(0.7		)	(1.4		)	11.0
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(3.9		)	185.3			21.5			—			202.9
Income tax benefit (provision)	0.8			(53.0		)	(3.7		)	—			(55.9		)
(Loss) income before equity in net income of affiliate and subsidiaries	(3.1		)	132.3			17.8			—			147.0
Equity in net income of affiliate	0.2			—			0.2			(0.2		)	0.2
Equity in net income of subsidiaries	150.1			17.7			—			(167.8		)	—
Net income	147.2			150.0			18.0			(168.0		)	147.2
Other comprehensive (loss) income	13.8			13.8			14.3			(28.1		)	13.8
Comprehensive income (loss)	$	161.0		$	163.8		$	32.3		$	(196.1	)	$	161.0

Condensed Balance Sheet

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net revenues	$	—		$	4,831.3		$	1,017.6		$	(462.2	)	$	5,386.7
Operating costs and expenses
Cost of sales	—			4,147.8			915.7			(462.2		)	4,601.3
Selling, general and administrative	8.0			133.1			13.4			—			154.5
Research and development	—			27.8			3.5			—			31.3
Total operating costs and expenses	8.0			4,308.7			932.6			(462.2		)	4,787.1
Operating (loss) income	(8.0		)	522.6			85.0			—			599.6
Interest expense and financing fee amortization	—			(60.1		)	(4.0		)	3.8			(60.3		)
Other income (expense), net	—			6.6			(3.6		)	(3.8		)	(0.8		)
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(8.0		)	469.1			77.4			—			538.5
Income tax benefit (provision)	1.5			(88.6		)	(12.6		)	—			(99.7		)
(Loss) income before equity in net income of affiliate and subsidiaries	(6.5		)	380.5			64.8			—			438.8
Equity in net income of affiliate	0.6			—			0.6			(0.6		)	0.6
Equity in net income of subsidiaries	445.3			64.8			—			(510.1		)	—
Net income	439.4			445.3			65.4			(510.7		)	439.4
Other comprehensive (loss) income	(16.5		)	(16.5		)	(14.7		)	31.2			(16.5		)
Comprehensive income (loss)	$	422.9		$	428.8		$	50.7		$	(479.5	)	$	422.9

Condensed Consolidating Statements of Operations

For the Nine Months EndedSeptember 28, 2017

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Net revenues	$	—		$	4,701.1		$	1,025.4		$	(458.1	)	$	5,268.4
Operating costs and expenses
Cost of sales	—			4,307.4			913.5			(458.1		)	4,762.8
Selling, general and administrative	8.8			130.4			10.7			—			149.9
Impact of severe weather event	—			19.9			—			—			19.9
Research and development	—			19.4			1.8			—			21.2
Total operating costs and expenses	8.8			4,477.1			926.0			(458.1		)	4,953.8
Operating (loss) income	(8.8		)	224.0			99.4			—			314.6
Interest expense and financing fee amortization	—			(30.1		)	(4.5		)	4.5			(30.1		)
Other income (expense), net	—			37.4			(0.7		)	(4.5		)	32.2
(Loss) income before income taxes and equity in net income of affiliate and subsidiaries	(8.8		)	231.3			94.2			—			316.7
Income tax (provision) benefit	2.7			(70.2		)	(17.4		)	—			(84.9		)
(Loss) income before equity in net income of affiliate and subsidiaries	(6.1		)	161.1			76.8			—			231.8
Equity in net income of affiliate	0.3			—			0.3			(0.3		)	0.3
Equity in net income of subsidiaries	237.9			76.8			—			(314.7		)	—
Net income	232.1			237.9			77.1			(315.0		)	232.1
Other comprehensive (loss) income	33.6			33.6			35.0			(68.6		)	33.6
Comprehensive income (loss)	$	265.7		$	271.5		$	112.1		$	(383.6	)	$	265.7

Condensed Consolidating Balance Sheet

September 27, 2018

	Holdings		Spirit		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets
Cash and cash equivalents	$	—	$	621.5	$	61.9	$	—		$	683.4
Restricted cash	—		0.3		—		—			0.3
Accounts receivable, net	—		730.1		322.7		(367.7		)	685.1
Contract assets, short-term	—		467.7		45.5		—			513.2
Inventory, net	—		610.1		320.9		—			931.0
Other current assets	—		32.4		3.0		—			35.4
Total current assets	—		2,462.1		754.0		(367.7		)	2,848.4
Property, plant and equipment, net	—		1,621.1		501.9		—			2,123.0
Contract assets, long-term	—		53.5		—		—			53.5
Pension assets, net	—		351.3		21.0		—			372.3
Investment in subsidiary	1,116.4		686.5		—		(1,802.9		)	—
Other assets	—		372.8		130.5		(218.4		)	284.9
Total assets	$	1,116.4	$	5,547.3	$	1,407.4	$	(2,389.0	)	$	5,682.1
Liabilities
Accounts payable	$	—	$	837.6	$	412.5	$	(367.7	)	$	882.4
Accrued expenses	—		317.6		36.4		—			354.0
Profit sharing	—		38.4		3.6		—			42.0
Current portion of long-term debt	—		24.1		0.9		—			25.0
Advance payments, short-term	—		112.7		—		—			112.7
Contract liabilities, short-term	—		153.5		—		—			153.5
Forward loss provision, long-term	—		147.3		—		—			147.3
Deferred revenue and other deferred credits, short-term	—		6.6		0.5		—			7.1
Deferred grant income liability - current	—		—		19.4		—			19.4
Other current liabilities	—		68.8		—		—			68.8
Total current liabilities	—		1,706.6		473.3		(367.7		)	1,812.2
Long-term debt	—		1,862.0		125.5		(117.8		)	1,869.7
Advance payments, long-term	—		144.2		2.2		—			146.4
Pension/OPEB obligation	—		38.4		—		—			38.4
Contract liabilities, long-term	—		353.8		—		—			353.8
Forward loss provision, long-term	—		72.6		—		—			72.6
Deferred grant income liability - non-current	—		5.8		24.9		—			30.7
Deferred revenue and other deferred credits	—		24.3		2.5		—			26.8
Other liabilities	—		303.2		12.5		(100.6		)	215.1
Total equity	1,116.4		1,036.4		766.5		(1,802.9		)	1,116.4
Total liabilities and stockholders’ equity	$	1,116.4	$	5,547.3	$	1,407.4	$	(2,389.0	)	$	5,682.1

Condensed Consolidating Balance Sheet

December 31, 2017

	Holdings		Spirit		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets
Cash and cash equivalents	$	—	$	365.1	$	58.2	$	—		$	423.3
Restricted cash	—		2.2		—		—			2.2
Accounts receivable, net	—		752.6		330.9		(361.3		)	722.2
Inventory, net	—		1,010.0		439.9		—			1,449.9
Other current assets	—		50.3		3.2		—			53.5
Total current assets	—		2,180.2		832.2		(361.3		)	2,651.1
Property, plant and equipment, net	—		1,585.8		519.5		—			2,105.3
Pension assets, net	—		327.2		19.9		—			347.1
Investment in subsidiary	1,801.5		704.4		—		(2,505.9		)	—
Other assets	—		298.2		124.5		(258.4		)	164.3
Total assets	$	1,801.5	$	5,095.8	$	1,496.1	$	(3,125.6	)	$	5,267.8
Liabilities
Accounts payable	$	—	$	629.0	$	425.4	$	(361.3	)	$	693.1
Accrued expenses	—		239.5		29.8		—			269.3
Profit sharing	—		103.4		6.1		—			109.5
Current portion of long-term debt	—		30.2		0.9		—			31.1
Advance payments, short-term	—		100.0		—		—			100.0
Deferred revenue and other deferred credits, short-term	—		63.6		1.0		—			64.6
Deferred grant income liability - current	—		—		21.6		—			21.6
Other current liabilities	—		324.3		7.5		—			331.8
Total current liabilities	—		1,490.0		492.3		(361.3		)	1,621.0
Long-term debt	—		1,110.6		167.1		(157.8		)	1,119.9
Advance payments, long-term	—		231.7		—		—			231.7
Pension/OPEB obligation	—		40.8		—		—			40.8
Deferred grant income liability - non-current	—		—		39.3		—			39.3
Deferred revenue and other deferred credits	—		158.2		2.8		—			161.0
Other liabilities	—		343.1		10.1		(100.6		)	252.6
Total equity	1,801.5		1,721.4		784.5		(2,505.9		)	1,801.5
Total liabilities and stockholders’ equity	$	1,801.5	$	5,095.8	$	1,496.1	$	(3,125.6	)	$	5,267.8

Condensed Cash Flow Statement

	Holdings		Spirit		Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets
Cash and cash equivalents	$	—	$	365.1	$	58.2	$	—		$	423.3
Restricted cash	—		2.2		—		—			2.2
Accounts receivable, net	—		752.6		330.9		(361.3		)	722.2
Inventory, net	—		1,010.0		439.9		—			1,449.9
Other current assets	—		50.3		3.2		—			53.5
Total current assets	—		2,180.2		832.2		(361.3		)	2,651.1
Property, plant and equipment, net	—		1,585.8		519.5		—			2,105.3
Pension assets, net	—		327.2		19.9		—			347.1
Investment in subsidiary	1,801.5		704.4		—		(2,505.9		)	—
Other assets	—		298.2		124.5		(258.4		)	164.3
Total assets	$	1,801.5	$	5,095.8	$	1,496.1	$	(3,125.6	)	$	5,267.8
Liabilities
Accounts payable	$	—	$	629.0	$	425.4	$	(361.3	)	$	693.1
Accrued expenses	—		239.5		29.8		—			269.3
Profit sharing	—		103.4		6.1		—			109.5
Current portion of long-term debt	—		30.2		0.9		—			31.1
Advance payments, short-term	—		100.0		—		—			100.0
Deferred revenue and other deferred credits, short-term	—		63.6		1.0		—			64.6
Deferred grant income liability - current	—		—		21.6		—			21.6
Other current liabilities	—		324.3		7.5		—			331.8
Total current liabilities	—		1,490.0		492.3		(361.3		)	1,621.0
Long-term debt	—		1,110.6		167.1		(157.8		)	1,119.9
Advance payments, long-term	—		231.7		—		—			231.7
Pension/OPEB obligation	—		40.8		—		—			40.8
Deferred grant income liability - non-current	—		—		39.3		—			39.3
Deferred revenue and other deferred credits	—		158.2		2.8		—			161.0
Other liabilities	—		343.1		10.1		(100.6		)	252.6
Total equity	1,801.5		1,721.4		784.5		(2,505.9		)	1,801.5
Total liabilities and stockholders’ equity	$	1,801.5	$	5,095.8	$	1,496.1	$	(3,125.6	)	$	5,267.8

Condensed Consolidating Statements of Cash Flows

For the Nine Months EndedSeptember 27, 2018

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments		Total
Operating activities
Net cash provided by operating activities	$	—		$	486.1		$	81.3		$	—	$	567.4
Investing activities
Purchase of property, plant and equipment	—			(142.9		)	(28.0		)	—		(170.9		)
Other	—			2.3			0.5			—		2.8
Net cash used in investing activities	—			(140.6		)	(27.5		)	—		(168.1		)
Financing activities
Proceeds from issuance of bonds	—			1,300.0			—			—		1,300.0
Principal payments of debt	—			(4.3		)	(0.6		)	—		(4.9		)
Payments on term loan	—			(256.3		)				—		(256.3		)
Payments on bonds	—			(300.0		)	—			—		(300.0		)
Proceeds (payments) from intercompany debt	—			49.7			(49.7		)	—		—
Debt issuance and financing costs	—			(23.2		)	—			—		(23.2		)
Taxes paid related to net share settlement of awards	—			(15.5		)	—			—		(15.5		)
Proceeds (payments) from subsidiary for purchase of treasury stock	805.8			(805.8		)	—			—		—
Purchase of treasury stock	(805.8		)	—			—			—		(805.8		)
Proceeds (payments) from subsidiary for dividends paid	35.4			(35.4		)	—			—		—
Dividends Paid	(35.4		)	—			—			—		(35.4		)
Net cash used in financing activities	—			(90.8		)	(50.3		)	—		(141.1		)
Effect of exchange rate changes on cash and cash equivalents	—			—			0.2			—		0.2
Net increase in cash, cash equivalents, and restricted cash for the period	—			254.7			3.7			—		258.4
Cash, cash equivalents, and restricted cash, beginning of period	—			387.3			58.2			—		445.5
Cash, cash equivalents, and restricted cash, end of period	$	—		$	642.0		$	61.9		$	—	$	703.9

Condensed Consolidating Statements of Cash Flows

For the Nine Months EndedSeptember 28, 2017

	Holdings			Spirit			Non-Guarantor Subsidiaries			Consolidating Adjustments		Total
Operating activities
Net cash provided by operating activities	$	—		$	525.7		$	98.9		$	—	$	624.6
Investing activities
Purchase of property, plant and equipment	—			(122.1		)	(16.6		)	—		(138.7		)
Proceeds from sale of assets	—			0.4			—			—		0.4
Other	—			—			—			—		—
Net cash used in investing activities	—			(121.7		)	(16.6		)	—		(138.3		)
Financing activities
Principal payments of debt	—			(0.7		)	(1.6		)	—		(2.3		)
Payment on term loan	—			(12.5		)	—			—		(12.5		)
Proceeds (payments) from intercompany debt	—			65.1			(65.1		)	—		—
Taxes paid related to net share settlement of awards	—			(13.8		)	—			—		(13.8		)
Debt issuance and financing costs	—			(0.9		)	—			—		(0.9		)
Proceeds from financing under the New Markets Tax Credit Program	—			7.6			—			—		7.6
Proceeds (payments) from subsidiary for purchase of treasury stock	402.1			(402.1		)	—			—		—
Purchase of treasury stock	(402.1		)	—			—			—		(402.1		)
Proceeds (payments) from subsidiary for dividends paid	35.7			(35.7		)	—			—		—
Dividends Paid	(35.7		)	—			—			—		(35.7		)
Net cash used in financing activities	—			(393.0		)	(66.7		)	—		(459.7		)
Effect of exchange rate changes on cash and cash equivalents	—			—			5.6			—		5.6
Net increase in cash, cash equivalents, and restricted cash for the period	—			11.0			21.2			—		32.2
Cash, cash equivalents, and restricted cash, beginning of period	—			700.0			17.6			—		717.6
Cash, cash equivalents, and restricted cash, end of period	$	—		$	711.0		$	38.8		$	—	$	749.8

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Commitments, Contingencies and Guarantees (Tables)

9 Months Ended

Sep. 27, 2018

Commitments Contingencies And Guarantees [Abstract]

Service warranty roll forward

The following is a roll forward of the service warranty and extraordinary rework balance at September 27, 2018:

Balance, December 31, 2017	$	166.4
Charges to costs and expenses	7.2
Payouts	(3.7		)
Exchange rate	(0.5		)
Balance, September 27, 2018	$	169.4

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Adoption of New Standard (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017	Dec. 31, 2017	Dec. 31, 2016
Item Effected [Line Items]
Cash and cash equivalents	$ 683.4	$ 726.6	$ 683.4	$ 726.6	$ 423.3	$ 697.7
Restricted Cash and Cash Equivalents	0.3	3.2	0.3	3.2	2.2	0.0
Accounts Receivable, Net, Current	685.1		685.1		722.2
Unbilled Receivables, Current	513.2		513.2		0.0
Inventory, net	931.0		931.0		1,449.9
Other Assets, Current	35.4		35.4		53.5
Unbilled Receivable, Non Current	53.5		53.5		0.0
Assets, Current	2,848.4		2,848.4		2,651.1
Property, Plant and Equipment, Net	2,123.0		2,123.0		2,105.3
Assets for Plan Benefits, Defined Benefit Plan	372.3		372.3		347.1
Revenues	1,813.7	1,748.2	5,386.7	5,268.4
Cost of Goods and Services Sold	1,543.1	1,486.6	4,601.3	4,762.8
Selling, General and Administrative Expense	37.3	49.8	154.5	149.9
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds	0.0	0.0	0.0	19.9
Research and Development Expense	10.8	9.5	31.3	21.2
Interest and Debt Expense	24.2	10.4	60.3	30.1
Other Nonoperating Income (Expense)	7.4	11.0	(0.8)	32.2
Income Tax Expense (Benefit)	(36.9)	(55.9)	(99.7)	(84.9)
Net Income (Loss) Attributable to Parent	$ 168.8	$ 147.2	$ 439.4	$ 232.1
Earnings Per Share, Basic	$ 1.61	$ 1.27	$ 4.02	$ 1.97
Earnings Per Share, Diluted	$ 1.59	$ 1.26	$ 3.98	$ 1.95
Other Assets, Noncurrent	$ 284.9		$ 284.9		164.3
Assets	5,682.1		5,682.1		5,267.8
Accounts Payable, Current	882.4		882.4		693.1
Accrued Liabilities, Current	354.0		354.0		269.3
Billings in Excess of Cost, Current	153.5		153.5		0.0
Provision for Loss on Contracts	147.3		147.3		0.0
Deferred Compensation Liability, Current	42.0		42.0		109.5
Long-term Debt and Capital Lease Obligations, Current	25.0		25.0		31.1
Customer Advances, Current	112.7		112.7		100.0
Deferred Revenue, Current	7.1		7.1		64.6
Deferred Grant Income Liability Current	19.4		19.4		21.6
Other Liabilities, Current	68.8		68.8		331.8
Billings in Excess of Cost, Noncurrent	353.8		353.8		0.0
Provision for Loss on Contacts, Non Current	72.6		72.6		0.0
Liabilities, Current	1,812.2		1,812.2		1,621.0
Long-term Debt and Capital Lease Obligations	1,869.7		1,869.7		1,119.9
Customer Advances, Noncurrent	146.4		146.4		231.7
Liability, Defined Benefit Plan, Noncurrent	38.4		38.4		40.8
Deferred Revenue and Credits, Noncurrent	26.8		26.8		161.0
Deferred Grant Income Liability Noncurrent	30.7		30.7		39.3
Other Liabilities, Noncurrent	215.1		215.1		252.6
Preferred Stock, Value, Issued	0.0		0.0		0.0
Additional Paid in Capital, Common Stock	983.4		983.4		1,086.9
Accumulated Other Comprehensive Income (Loss), Net of Tax	(145.0)		(145.0)		(128.5)
Retained Earnings (Accumulated Deficit)	2,548.7		2,548.7		2,422.4
Treasury Stock, Value	2,272.3		2,272.3		1,580.9
Stockholders' Equity Attributable to Parent	1,115.9		1,115.9		1,801.0
Stockholders' Equity Attributable to Noncontrolling Interest	0.5		0.5		0.5
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	1,116.4		1,116.4		1,801.5
Liabilities and Equity	5,682.1		5,682.1		5,267.8
Restricted Cash and Investments, Noncurrent	20.2	$ 20.0	20.2	$ 20.0	20.0	19.9
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	703.9	749.8	703.9	749.8	$ 445.5	$ 717.6
Transition Adjustment	277.0		277.0
Transition Adjustment - deferred production costs	640.3		640.3
Transition adjustment - forward loss reserves	364.0		364.0
Transition Adjustment - contract asset	342.0		342.0
Transition Adjustment - contract liability	113.0		113.0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Item Effected [Line Items]
Accounts Receivable, Net, Current	131.0		131.0
Unbilled Receivables, Current	(513.2)		(513.2)
Inventory, net	445.2		445.2
Other Assets, Current	36.1		36.1
Unbilled Receivable, Non Current	(53.5)		(53.5)
Revenues	15.9		106.6
Cost of Goods and Services Sold	68.2		207.7
Income Tax Expense (Benefit)	10.6		20.9
Net Income (Loss) Attributable to Parent	$ (41.7)		$ (80.2)
Earnings Per Share, Basic	$ (0.40)		$ (0.73)
Earnings Per Share, Diluted	$ (0.39)		$ (0.72)
Other Assets, Noncurrent	$ (78.5)		$ (78.5)
Assets	(32.9)		(32.9)
Accrued Liabilities, Current	(7.1)		(7.1)
Billings in Excess of Cost, Current	(153.5)		(153.5)
Provision for Loss on Contracts	(147.3)		(147.3)
Deferred Revenue, Current	144.9		144.9
Other Liabilities, Current	290.8		290.8
Billings in Excess of Cost, Noncurrent	(353.8)		(353.8)
Provision for Loss on Contacts, Non Current	(72.6)		(72.6)
Deferred Revenue and Credits, Noncurrent	71.5		71.5
Accumulated Other Comprehensive Income (Loss), Net of Tax	(2.2)		(2.2)
Retained Earnings (Accumulated Deficit)	196.4		196.4
Liabilities and Equity	(32.9)		(32.9)
Accounting Standards Update 2014-09 [Member]
Item Effected [Line Items]
Accounts Receivable, Net, Current	816.1		816.1
Unbilled Receivables, Current	0.0		0.0
Inventory, net	1,376.2		1,376.2
Other Assets, Current	71.5		71.5
Unbilled Receivable, Non Current	0.0		0.0
Revenues	1,829.6		5,493.3
Cost of Goods and Services Sold	1,611.3		4,809.0
Income Tax Expense (Benefit)	(26.3)		(78.8)
Net Income (Loss) Attributable to Parent	$ 127.1		$ 359.2
Earnings Per Share, Basic	$ 1.21		$ 3.29
Earnings Per Share, Diluted	$ 1.20		$ 3.26
Other Assets, Noncurrent	$ 206.4		$ 206.4
Assets	5,649.2		5,649.2
Accrued Liabilities, Current	346.9		346.9
Billings in Excess of Cost, Current	0.0		0.0
Provision for Loss on Contracts	0.0		0.0
Deferred Revenue, Current	152.0		152.0
Other Liabilities, Current	359.6		359.6
Billings in Excess of Cost, Noncurrent	0.0		0.0
Provision for Loss on Contacts, Non Current	0.0		0.0
Deferred Revenue and Credits, Noncurrent	98.3		98.3
Accumulated Other Comprehensive Income (Loss), Net of Tax	(147.2)		(147.2)
Retained Earnings (Accumulated Deficit)	2,745.1		2,745.1
Liabilities and Equity	$ 5,649.2		$ 5,649.2
Balance prior to Adoption of ASU 2017-07 [Member]
Item Effected [Line Items]
Cost of Goods and Services Sold		1,478.5		4,738.3
Selling, General and Administrative Expense		48.8		146.8
Other Nonoperating Income (Expense)		1.9		4.6
Impact of 2017-07 [Member]
Item Effected [Line Items]
Cost of Goods and Services Sold		8.1		24.5
Selling, General and Administrative Expense		1.0		3.1
Other Nonoperating Income (Expense)		$ 9.1		$ 27.6

XML

Summary of Significant Accounting Policies (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 27, 2018 USD ($)	Sep. 27, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Costs Incurred in Anticipation of Contracts	$ 152.9	$ 152.9
Revenues	1,813.7	5,386.7
Boeing [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,465.5	4,262.2
Airbus [Member]
Disaggregation of Revenue [Line Items]
Revenues	263.8	869.0
Other Customer [Member]
Disaggregation of Revenue [Line Items]
Revenues	84.4	255.5
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues	1,534.0	4,460.8
UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues	184.4	574.1
Other International [Member]
Disaggregation of Revenue [Line Items]
Revenues	95.3	351.8
Total International [Member]
Disaggregation of Revenue [Line Items]
Revenues	279.7	925.9
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,456.7	4,212.6
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 357.0	$ 1,174.1

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Changes in Estimates (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Change In Estimate [Line Items]
Current Period Forward Loss Recorded			$ (1.7)
Cumulative Catch Up Adjustment			$ (1.2)	$ 28.7
Changes in Contract Estimates, aggregate, Affecting earnings from Continuing Operations, per Share diluted	$ (0.10)	$ (0.03)	$ (0.02)	$ (1.75)
Change In Accounting Estimate, aggregate	$ (13.5)	$ (4.8)	$ (2.9)	$ (330.9)
Reduction In Previously Reported Forward-Loss				(359.6)
Cumulative catch-up adjustment [Member]
Change In Estimate [Line Items]
Change in Accounting Estimate - Contract Accounting	(13.0)	(2.8)
Change in Estimate on Loss Program [Member]
Change In Estimate [Line Items]
Change in Accounting Estimate - Contract Accounting		(2.0)
Forward Loss [Member]
Change In Estimate [Line Items]
Change in Accounting Estimate - Contract Accounting	(0.5)
Fuselage Systems [Member]
Change In Estimate [Line Items]
Current Period Forward Loss Recorded			(1.5)
Cumulative Catch Up Adjustment			(3.0)	5.3
Reduction In Previously Reported Forward-Loss				(238.5)
Fuselage Systems [Member] | Cumulative catch-up adjustment [Member]
Change In Estimate [Line Items]
Change in Accounting Estimate - Contract Accounting	(12.0)	(2.4)
Fuselage Systems [Member] | Change in Estimate on Loss Program [Member]
Change In Estimate [Line Items]
Change in Accounting Estimate - Contract Accounting		(0.9)
Fuselage Systems [Member] | Forward Loss [Member]
Change In Estimate [Line Items]
Change in Accounting Estimate - Contract Accounting	0.0
Wing Systems [Member]
Change In Estimate [Line Items]
Cumulative Catch Up Adjustment			0.9	19.1
Reduction In Previously Reported Forward-Loss			(0.2)	(74.4)
Wing Systems [Member] | Cumulative catch-up adjustment [Member]
Change In Estimate [Line Items]
Change in Accounting Estimate - Contract Accounting	1.4	(2.8)
Wing Systems [Member] | Change in Estimate on Loss Program [Member]
Change In Estimate [Line Items]
Change in Accounting Estimate - Contract Accounting	0.3	(2.4)
Propulsion Systems [Member]
Change In Estimate [Line Items]
Current Period Forward Loss Recorded				(46.7)
Cumulative Catch Up Adjustment			0.9	$ 4.3
Reduction In Previously Reported Forward-Loss			$ 0.0
Change in Accounting Estimate - Contract Accounting	(0.8)
Propulsion Systems [Member] | Cumulative catch-up adjustment [Member]
Change In Estimate [Line Items]
Change in Accounting Estimate - Contract Accounting	$ (2.4)	2.4
Propulsion Systems [Member] | Change in Estimate on Loss Program [Member]
Change In Estimate [Line Items]
Change in Accounting Estimate - Contract Accounting		$ 1.3

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Accounts Receivable, net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017	Dec. 31, 2017
Accounts Receivable, Net, Current [Abstract]
Transfer of Financial Assets Accounted for as Sales, Amount Derecognized	$ 4,145.5		$ 4,145.5
Trade receivables	660.0		660.0		$ 710.5
Other	25.7		25.7		13.0
Less: allowance for doubtful accounts	(0.6)		(0.6)		(1.3)
Accounts receivable, net	685.1		685.1		$ 722.2
Gain (Loss) on Sale of Accounts Receivable	$ (4.0)	$ 0.0	$ (12.3)	$ 0.0

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Contract with customer, asset and liability (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 27, 2018	Sep. 27, 2018	Jan. 01, 2018
Revenue from Contract with Customer [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 40,100,000.0
Contract with Customer, Asset, Gross	566,700,000	$ 566,700,000	$ 517,800,000
Change in contract asset		48,900,000
Contract with Customer, Liability	(507,300,000)	(507,300,000)	(319,400,000)
Change in contract liability		(187,900,000)
Contract with Customer, Asset, Net	$ 59,400,000	59,400,000	$ 198,400,000
Change in net contract asset		$ (139,000,000)

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Performance Obligations (Details) $ in Millions	Sep. 27, 2018 USD ($)
Remaining in Current Year [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 1,320.4
2019 [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	6,302.7
2020 [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	5,680.9
2021 and after [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation	$ 1,648.3

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Inventory (Details) - USD ($) $ in Millions	Sep. 27, 2018	Dec. 31, 2017
Summary Of Inventories [Abstract]
Raw materials	$ 251.3	$ 321.0
Work-in-process	631.0	854.4
Finished goods	8.9	35.8
Product inventory	891.2	1,211.2
Capitalized pre-production	39.8	78.9
Deferred Production Costs	0.0	640.3
Provision for Loss on Contracts, Inventory	0.0	480.5
Total inventory, net	$ 931.0	$ 1,449.9

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Inventory (Details 1) - USD ($) $ in Millions	9 Months Ended
	Sep. 28, 2017	Sep. 27, 2018	Dec. 31, 2017
Capitalized Preproduction Costs Included In Inventory [Abstract]
Capitalized pre-production		$ 39.8	$ 78.9
Deferred Production Costs		0.0	640.3
Forward loss provision		(147.3)	0.0
Total inventory, net		$ 931.0	1,449.9
Reduction In Previously Reported Forward-Loss	$ (359.6)
Airbus Three Hundred Fifty XWB [Member]
Capitalized Preproduction Costs Included In Inventory [Abstract]
Deferred Production Costs			632.8
Rolls-Royce
Capitalized Preproduction Costs Included In Inventory [Abstract]
Deferred Production Costs			$ 129.3

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Inventory (Details 2) - USD ($) $ in Millions	Sep. 27, 2018	Dec. 31, 2017
Inventories [Line Items]
Costs Incurred in Anticipation of Contracts	$ 152.9
Forward Loss Provision, gross	219.9
Transition adjustment - capitalized costs (pretax)	43.0
Block And Order Detail [Abstract]
Transition Adjustment - deferred production costs	$ 640.3
forward loss provision		$ 254.5

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Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 27, 2018	Dec. 31, 2017
Property, plant and equipment, net
Land	$ 15.5	$ 15.9
Buildings (including improvements)	813.3	764.1
Machinery and equipment	1,630.3	1,529.9
Tooling	1,027.2	1,013.9
Capitalized software	269.2	263.3
Construction-in-progress	212.5	213.4
Total	3,968.0	3,800.5
Less: accumulated depreciation	(1,845.0)	(1,695.2)
Property, plant and equipment, net	$ 2,123.0	$ 2,105.3

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Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Property Plant And Equipment Textuals [Abstract]
Repair and maintenance costs	$ 31.3	$ 37.6	$ 99.0	$ 88.9
Depreciation expense related to capitalized software	$ 4.1	$ 4.5	$ 12.7	$ 14.8

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Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 27, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring Basis Financial Statement Captions [Line Items]
ASCO - purchase price	$ 650.0
Carrying amount and estimated fair value of long term debt
Carrying Amount	1,791.9	$ 1,052.7
Fair Value	1,774.2	1,067.5
Secured Debt Term A [Member]
Debt Instrument [Line Items]
Secured Debt, Current		24.9
Secured Long-term Debt, Noncurrent		435.8
Carrying amount and estimated fair value of long term debt
Carrying Amount	204.9	460.7
Fair Value	204.7	461.9
Senior Unsecured Notes Due 2021 [Member]
Carrying amount and estimated fair value of long term debt
Carrying Amount	298.4	0.0
Fair Value	299.0	0.0
Senior unsecured notes due 2022 [Member]
Carrying amount and estimated fair value of long term debt
Carrying Amount	0.0	294.8
Fair Value	0.0	304.6
SeniorUnsecuredNotesDueTwoThousandAndTwentySix [Member] [Member]
Carrying amount and estimated fair value of long term debt
Carrying Amount	297.5	297.2
Fair Value	284.3	301.0
Senior Unsecured Notes Due 2023 [Member]
Carrying amount and estimated fair value of long term debt
Carrying Amount	297.8	0.0
Fair Value	296.8	0.0
Senior Unsecured Notes Due 2028 [Member]
Carrying amount and estimated fair value of long term debt
Carrying Amount	693.3	0.0
Fair Value	$ 689.4	$ 0.0

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Other Assets (Details) - USD ($) $ in Millions	Sep. 27, 2018	Dec. 31, 2017	Sep. 28, 2017	Dec. 31, 2016
Intangible assets
Total intangible assets	$ 8.2	$ 8.2
Intangible assets, net	1.5	1.8
Deferred financing costs	41.7	39.5
Less: Accumulated amortization-deferred financing costs	(35.3)	(33.7)
Deferred financing costs, net	6.4	5.8
Goodwill - Europe	2.4	2.5
Equity in net assets of affiliates	0.0	4.7
Customer Supply Agreement	16.3	19.9
Restricted Cash and Investments, Noncurrent	20.2	20.0	$ 20.0	$ 19.9
Deferred Tax Assets, Net, Noncurrent	194.9	72.5
Other	43.2	37.1
Total	284.9	164.3
Patents [Member]
Intangible assets
Total intangible assets	1.9	1.9
Less: Accumulated amortization	(1.9)	(1.8)
Favorable Leasehold Interests [Member]
Intangible assets
Total intangible assets	6.3	6.3
Less: Accumulated amortization	$ (4.8)	$ (4.6)

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Derivative and Hedging Activities (Details) $ in Millions	Sep. 27, 2018 USD ($)
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 250.0

XML

Derivative and Hedging Activities (Details 1) - Interest Rate Swap [Member] $ in Millions	Sep. 27, 2018 USD ($)
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 250.0
Derivative, Fixed Interest Rate	1.815%

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Derivative and Hedging Activities (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017	Jun. 28, 2018	Dec. 31, 2017
Derivatives Fair Value [Line Items]
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	$ 0.3	$ (1.1)	$ 2.6	$ (1.1)
ASCO - purchase price	650.0		650.0
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	0.8	$ 0.0	(20.7)	$ 0.0
Interest Rate Swap [Member]
Derivatives Fair Value [Line Items]
Derivative, Fair Value, Net	3.5		3.5			$ 0.9
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	(0.3)		(2.6)
Derivative, Notional Amount	250.0		250.0
Foreign Exchange Forward [Member]
Derivatives Fair Value [Line Items]
Derivative, Fair Value, Net	6.0		6.0
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments			20.7
Derivative, Notional Amount	568.3		$ 568.3		$ 580.0
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ (0.8)

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Advance Payments and Deferred Revenue/Credits (Details) $ in Millions	Sep. 27, 2018 USD ($)
Deferred Revenue Arrangement [Line Items]
Customer advances	$ 257

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Debt (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 27, 2018	Dec. 31, 2017	Jun. 01, 2016
Long Term Debt And Capital Lease Obligations Current And Non Current [Abstract]
Capital Lease Obligations, Current	$ 6.9	$ 5.2
Capital Lease Obligations, Noncurrent	36.3	33.6
Other Long-term Debt, Current	1.0	1.0
Other Long-term Debt, Noncurrent	58.6	58.5
Long-term Debt and Capital Lease Obligations, Current	25.0	31.1
Long-term Debt and Capital Lease Obligations	1,869.7	1,119.9
Optional Revolver Commitment	750.0
Secured Debt Term A [Member]
Debt Disclosure [Abstract]
Secured Debt, Current		24.9
Secured Long-term Debt, Noncurrent		435.8
Debt Type [Line Items]
Unsecured Debt	17.1
Long Term Debt And Capital Lease Obligations Current And Non Current [Abstract]
Gain (Loss) on Extinguishment of Debt	1.3
Unsecured Long-term Debt, Noncurrent	187.8
Senior unsecured notes due 2022 [Member]
Debt Type [Line Items]
Extinguishment of Debt, Amount	300.0
Long Term Debt And Capital Lease Obligations Current And Non Current [Abstract]
Senior Notes, Current	0.0	0.0
Senior Notes, Noncurrent	0.0	294.8
Debt Instrument, Repurchase Amount	202.6
Incremental Tender Amount	97.4
Gain (Loss) on Extinguishment of Debt	13.2
Senior Unsecured Notes Due 2026 [Member]
Debt Type [Line Items]
Debt Instrument, Face Amount			$ 300.0
Debt Instrument, Interest Rate, Stated Percentage			3.85%
Long Term Debt And Capital Lease Obligations Current And Non Current [Abstract]
Senior Notes, Current	0.0	0.0
Senior Notes, Noncurrent	297.5	297.2
Senior Unsecured Notes Due 2021 [Member]
Debt Type [Line Items]
Debt Instrument, Face Amount	$ 300.0
Debt Instrument, Interest Rate Terms	The Floating Rate Notes bear interest at a rate per annum equal to three-month LIBOR, as determined in the case of the initial interest period, on May 25, 2018, and thereafter at the beginning of each quarterly period as described herein, plus 80 basis points and mature on June 15, 2021. Interest on the Floating Rate Notes is payable on March 15, June 15, September 15 and December 15 of each year, beginning on September 15, 2018.
Long Term Debt And Capital Lease Obligations Current And Non Current [Abstract]
Senior Notes, Current	$ 0.0	0.0
Senior Notes, Noncurrent	298.4	0.0
Senior Unsecured Notes Due 2023 [Member]
Debt Type [Line Items]
Debt Instrument, Face Amount	$ 300.0
Debt Instrument, Interest Rate, Stated Percentage			3.95%
Debt Instrument, Interest Rate Terms	The 2023 Notes bear interest at a rate of 3.950% per annum and mature on June 15, 2023
Long Term Debt And Capital Lease Obligations Current And Non Current [Abstract]
Senior Notes, Current	$ 0.0	0.0
Senior Notes, Noncurrent	297.8	0.0
Senior Unsecured Notes Due 2028 [Member]
Debt Type [Line Items]
Debt Instrument, Face Amount	$ 700.0
Debt Instrument, Interest Rate, Stated Percentage			4.60%
Debt Instrument, Interest Rate Terms	The 2028 Notes bear interest at a rate of 4.600% per annum and mature on June 15, 2028.
Long Term Debt And Capital Lease Obligations Current And Non Current [Abstract]
Senior Notes, Current	$ 0.0	0.0
Senior Notes, Noncurrent	$ 693.3	$ 0.0
2018 Revolver, 2018 Term Loan, Delayed Term Loan [Member]
Debt Type [Line Items]
Debt Instrument, Interest Rate Terms	Each of the 2018 Revolver, the 2018 Term Loan and the Delayed Draw Term Loan matures July 12, 2023, and bears interest, at Spirit’s option, at either LIBOR plus 1.375% or a defined “base rate” plus 0.375%, subject to adjustment to between LIBOR plus 1.125% and LIBOR plus 1.875% (or between base rate plus 0.125% and base rate plus 0.875%, as applicable) based on changes to Spirit’s senior unsecured debt rating provided by Standard & Poor’s Financial Services LLC and/or Moody’s Investors Service, Inc.
Debt Instrument, Payment Terms	The principal obligations under the Delayed Draw Term Loan are to be repaid in equal quarterly installments of 1.25% of the outstanding principal amount of the Delayed Draw Term Loan as of March 31, 2019, subject to adjustments for any extension of the availability period of the Delayed Draw Term Loan, with the balance due at maturity of the Delayed Draw Term Loan.
Senior Unsecured Notes due 2023 and 2028 [Member]
Debt Type [Line Items]
Debt Instrument, Payment Terms	Interest on the 2023 Notes and 2028 Notes is payable on June 15 and December 15 of each year, beginning on December 15, 2018.

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Debt (Details Textual) - USD ($) $ in Millions	9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Dec. 31, 2017	Dec. 31, 2016	Jun. 01, 2016
Debt Instrument [Line Items]
Proceeds from (Payments for) Other Financing Activities	$ 0.0	$ 0.0
Optional Revolver Commitment	750.0
Restricted Cash and Cash Equivalents	0.3	$ 3.2	$ 2.2	$ 0.0
Senior Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 300.0
Debt Instrument, Interest Rate Terms	The Floating Rate Notes bear interest at a rate per annum equal to three-month LIBOR, as determined in the case of the initial interest period, on May 25, 2018, and thereafter at the beginning of each quarterly period as described herein, plus 80 basis points and mature on June 15, 2021. Interest on the Floating Rate Notes is payable on March 15, June 15, September 15 and December 15 of each year, beginning on September 15, 2018.
Senior Notes, Noncurrent	$ 298.4		0.0
Senior Notes, Current	0.0		0.0
Secured Debt Term A [Member]
Debt Instrument [Line Items]
Unsecured Long-term Debt, Noncurrent	187.8
Gain (Loss) on Extinguishment of Debt	1.3
Senior unsecured notes due 2022 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	13.2
Senior Notes, Noncurrent	0.0		294.8
Senior Notes, Current	$ 0.0		0.0
Senior Unsecured Notes Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount					$ 300.0
Debt Instrument, Interest Rate, Stated Percentage					3.85%
Maturity Date 2022 Notes	Jun. 15, 2026
Senior Notes, Noncurrent	$ 297.5		297.2
Senior Notes, Current	0.0		$ 0.0
Amended and Restated Credit Agreement Due 2021 [Member]
Debt Instrument [Line Items]
Outstanding Balance Term Loan	206.3
Carry Value Term Loan	204.9
2018 Amended Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,260.0
2018 Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	800.0
2018 Term Loan A [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	206.0
Debt Instrument, Periodic Payment, Principal	2.6
Delayed Draw Term Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250.0
2018 Revolver, 2018 Term Loan, Delayed Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate Terms	Each of the 2018 Revolver, the 2018 Term Loan and the Delayed Draw Term Loan matures July 12, 2023, and bears interest, at Spirit’s option, at either LIBOR plus 1.375% or a defined “base rate” plus 0.375%, subject to adjustment to between LIBOR plus 1.125% and LIBOR plus 1.875% (or between base rate plus 0.125% and base rate plus 0.875%, as applicable) based on changes to Spirit’s senior unsecured debt rating provided by Standard & Poor’s Financial Services LLC and/or Moody’s Investors Service, Inc.
Debt Instrument, Payment Terms	The principal obligations under the Delayed Draw Term Loan are to be repaid in equal quarterly installments of 1.25% of the outstanding principal amount of the Delayed Draw Term Loan as of March 31, 2019, subject to adjustments for any extension of the availability period of the Delayed Draw Term Loan, with the balance due at maturity of the Delayed Draw Term Loan.

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Pension and Other Post Retirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Pension And Other Post Retirement Benefits Textuals [Abstract]
Defined Benefit Plan Estimated Future Employer Contributions Remainder Of Year			$ 7.4
Expected UK Pension Plan Contribution For The Year			1.8
Other Postretirement Benefits Plan [Member]
Pension and Other Post-Retirement Benefits
Service cost	$ 0.3	$ 0.3	0.8	$ 0.9
Interest cost	0.3	0.3	0.8	0.9
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(0.2)	(0.2)	(0.7)	(0.7)
Amortization of net loss	(0.6)	(0.5)	(1.7)	(1.6)
Net periodic pension income	(0.2)	(0.1)	(0.8)	(0.5)
Defined Benefit Plans [Member]
Pension and Other Post-Retirement Benefits
Service cost	0.2	0.2	0.6	0.7
Interest cost	9.2	9.4	27.4	28.3
Expected return on plan assets	(17.4)	(18.2)	(52.3)	(54.6)
Amortization of net loss	0.0	0.1	0.0	0.1
Net periodic pension income	$ (8.0)	$ (8.5)	$ (24.3)	$ (25.5)

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Stock Compensation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company recognized total stock compensation expense, net of forfeitures			$ 19.9	$ 15.9
LTIA AND Prior Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company recognized total stock compensation expense, net of forfeitures	$ 6.3	$ 4.8	$ 19.9	$ 15.9
Class A [Member] | Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	460,028
Grant date value of shares vested	$ 24.2
Class A [Member] | Market Based LTIA [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	92,375
Fair Value Of Shares Granted	$ 8.4
Class A [Member] | Service Based LTIA [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	242,419
Fair Value Of Shares Granted	$ 21.5
Class A [Member] | Performance Based LTIA [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	63,904
Fair Value Of Shares Granted	$ 5.7

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Income Tax (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Dec. 31, 2017
Income Taxes Textuals [Abstract]
Deferred tax assets net total	$ (194.5)		$ (72.2)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 2.8
Valuation Allowance [Line Items]
Effective tax rate	18.50%	26.80%

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Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.12	$ 0.10	$ 0.34	$ 0.30
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (145.0)		$ (145.0)		$ (128.5)
Basic EPS
Income available to common shareholders	$ 168.7	$ 147.1	$ 439.1	$ 231.9
Income available to common shareholders, shares	105.1	115.8	109.3	117.8
Income available to common shareholders, per share amount	$ 1.61	$ 1.27	$ 4.02	$ 1.97
Income allocated to participating securities	$ 0.1	$ 0.1	$ 0.3	$ 0.2
Income allocated to participating securities, shares	0.1	0.1	0.1	0.1
Net income	$ 168.8	$ 147.2	$ 439.4	$ 232.1
Diluted potential common shares	0.9	1.1	0.9	1.1
Diluted EPS
Net income	$ 168.8	$ 147.2	$ 439.4	$ 232.1
Shares	106.1	117.0	110.3	119.0
Diluted (in dollars per share)	$ 1.59	$ 1.26	$ 3.98	$ 1.95
Equity Textuals [Abstract]
Common shares outstanding issued but unvested	1.4	1.5	1.4	1.5
Noncontrolling interest	$ 0.5		$ 0.5		0.5
Pension [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(76.0)		(76.0)		(75.9)
SERP and Retiree medical [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	16.0		16.0		17.7
Foreign currency impact on long term intercompany loan [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(15.5)		(15.5)		(14.2)
Currency translation adjustment [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (69.5)		(69.5)		$ (56.1)
Accelerated Share Repurchase Program [Member]
Derivatives, Fair Value [Line Items]
Treasury Stock, Value, Acquired, Cost Method			$ 725.0

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Other Income (Expense), Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017
Other Nonoperating Income (Expense) [Abstract]
Kansas Development Finance Authority bond	$ 0.8	$ 0.6	$ 2.9	$ 2.3
Rental and miscellaneous income (loss)	0.6	1.6	(0.7)	0.2
Interest Income, Other	2.1	1.9	5.0	4.4
Foreign currency losses	(1.8)	(1.1)	(3.3)	(1.2)
Gain (Loss) on Sale of Accounts Receivable	(4.0)	0.0	(12.3)	0.0
pension income (expense) without service cost	8.6	9.1	25.7	27.6
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	0.8	0.0	(20.7)	0.0
Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments	0.3	(1.1)	2.6	(1.1)
Total	$ 7.4	$ 11.0	$ (0.8)	$ 32.2

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Segment Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018 USD ($)	Sep. 28, 2017 USD ($)	Sep. 27, 2018 USD ($) segment	Sep. 28, 2017 USD ($)
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold	$ 1,543.1	$ 1,486.6	$ 4,601.3	$ 4,762.8
Segment Revenues
Segment Revenues	1,813.7		5,386.7
Revenues	1,813.7	1,748.2	5,386.7	5,268.4
Segment Operating Income
Business Segment Operating Income	270.9	265.5	788.0	522.6
Segment Information Unallocated Corporate Selling General And Administrative	(37.3)	(49.8)	(154.5)	(149.9)
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds	0.0	0.0	0.0	(19.9)
Segment Information Unallocated Research And Development	(10.8)	(9.5)	(31.3)	(21.2)
Segment Information Unallocated Cost Of Sales	(0.3)	(3.9)	(2.6)	(17.0)
Operating income	$ 222.5	202.3	599.6	314.6
Segment Reporting Information, Additional Information [Abstract]
Forward Loss Recorded For The Period			$ (1.7)
Reduction In Previously Reported Forward-Loss				(359.6)
Number Of Principal Segments | segment			3
Percentage Of Net Revenue Derived From Two Largest Customers	95.00%
Cumulative Catch Up Adjustment			$ (1.2)	28.7
Fuselage Systems [Member]
Segment Revenues
Segment Revenues	$ 991.0	957.0	2,983.4	2,812.1
Segment Operating Income
Business Segment Operating Income	134.8	143.8	417.7	205.0
Segment Reporting Information, Additional Information [Abstract]
Forward Loss Recorded For The Period			(1.5)
Reduction In Previously Reported Forward-Loss				(238.5)
Cumulative Catch Up Adjustment			(3.0)	5.3
Propulsion Systems [Member]
Segment Revenues
Segment Revenues	442.4	407.9	1,259.6	1,250.7
Segment Operating Income
Business Segment Operating Income	76.2	72.4	203.9	183.4
Segment Reporting Information, Additional Information [Abstract]
Forward Loss Recorded For The Period				(46.7)
Reduction In Previously Reported Forward-Loss			0.0
Cumulative Catch Up Adjustment			0.9	4.3
Wing Systems [Member]
Segment Revenues
Segment Revenues	378.6	382.2	1,138.6	1,201.7
Segment Operating Income
Business Segment Operating Income	58.6	49.1	166.1	134.7
Segment Reporting Information, Additional Information [Abstract]
Reduction In Previously Reported Forward-Loss			(0.2)	(74.4)
Cumulative Catch Up Adjustment			0.9	19.1
Other Systems [Member]
Segment Revenues
Segment Revenues	1.7	1.1	5.1	3.9
Segment Operating Income
Business Segment Operating Income	$ 1.3	0.2	$ 0.3	(0.5)
Impact of 2017-07 [Member]
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold		8.1		24.5
Impact of 2017-07 [Member] | Fuselage Systems [Member]
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold		4.5		13.5
Impact of 2017-07 [Member] | Propulsion Systems [Member]
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold		1.8		5.5
Impact of 2017-07 [Member] | Wing Systems [Member]
Segment Reporting Information [Line Items]
Cost of Goods and Services Sold		$ 1.8		$ 5.5

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Business Combination (Details) $ in Millions	Sep. 27, 2018 USD ($)
Business Acquisition [Line Items]
Business Acquisition, Transaction Costs	$ 14.8
ASCO - purchase price	$ 650.0

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Condensed Consolidating Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2018	Sep. 28, 2017	Sep. 27, 2018	Sep. 28, 2017	Dec. 31, 2017	Dec. 31, 2016
Condensed Consolidating Statements of Operations [Abstract]
Revenue	$ 1,813.7	$ 1,748.2	$ 5,386.7	$ 5,268.4
Operating costs and expenses
Cost of sales	1,543.1	1,486.6	4,601.3	4,762.8
Selling, general and administrative	37.3	49.8	154.5	149.9
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds	0.0	0.0	0.0	19.9
Research and development	10.8	9.5	31.3	21.2
Total operating costs and expenses	1,591.2	1,545.9	4,787.1	4,953.8
Operating income	222.5	202.3	599.6	314.6
Interest expense and financing fee amortization	(24.2)	(10.4)	(60.3)	(30.1)
Other expense, net	7.4	11.0	(0.8)	32.2
Income (loss) before income taxes and equity in net loss of affiliates and subsidiaries	205.7	202.9	538.5	316.7
Income tax provision	(36.9)	(55.9)	(99.7)	(84.9)
Income (loss) Before Equity In Net Income (Loss) Of Affiliates and Subsidiaries	168.8	147.0	438.8	231.8
Equity in net income of affiliate	0.0	0.2	0.6	0.3
Equity in net income of subsidiaries	0.0		0.0
Net income	168.8	147.2	439.4	232.1
Total other comprehensive income (loss)	(0.6)	13.8	(16.5)	33.6
Comprehensive Income, Net of Tax, Attributable to Parent	168.2	161.0	422.9	265.7
Assets
Cash and cash equivalents	703.9	749.8	703.9	749.8	$ 445.5	$ 717.6
Restricted Cash and Cash Equivalents	0.3	3.2	0.3	3.2	2.2	0.0
Accounts receivable, net	685.1		685.1		722.2
Unbilled Receivables, Current	513.2		513.2		0.0
Inventory	931.0		931.0		1,449.9
Other current assets	35.4		35.4		53.5
Total current assets	2,848.4		2,848.4		2,651.1
Property, plant and equipment, net	2,123.0		2,123.0		2,105.3
Unbilled Receivable, Non Current	53.5		53.5		0.0
Pension assets	372.3		372.3		347.1
Other assets	284.9		284.9		164.3
Total assets	5,682.1		5,682.1		5,267.8
Liabilities
Accounts payable	882.4		882.4		693.1
Accrued expenses	354.0		354.0		269.3
Profit sharing	42.0		42.0		109.5
Current portion of long-term debt	25.0		25.0		31.1
Advance payments, short-term	112.7		112.7		100.0
Billings in Excess of Cost, Current	153.5		153.5		0.0
Provision for Loss on Contracts	147.3		147.3		0.0
Deferred revenue and other deferred credits, short-term	7.1		7.1		64.6
Deferred grant income liability - current	19.4		19.4		21.6
Other current liabilities	68.8		68.8		331.8
Total current liabilities	1,812.2		1,812.2		1,621.0
Long-term debt	1,869.7		1,869.7		1,119.9
Advance payments, long-term	146.4		146.4		231.7
Pension/OPEB obligation	38.4		38.4		40.8
Billings in Excess of Cost, Noncurrent	353.8		353.8		0.0
Provision for Loss on Contacts, Non Current	72.6		72.6		0.0
Deferred grant income liability - non-current	30.7		30.7		39.3
Deferred revenue and other deferred credits	26.8		26.8		161.0
Other liabilities	215.1		215.1		252.6
Total equity	1,116.4		1,116.4		1,801.5
Total liabilities and equity	5,682.1		5,682.1		5,267.8
Operating activities
Net cash (used in) operating activities			567.4	624.6
Investing activities
Purchase of property, plant and equipment			(170.9)	(138.7)
Proceeds from Sales of Assets, Investing Activities				0.4
Payments for (Proceeds from) Other Investing Activities			2.8	0.0
Net cash used in investing activities			(168.1)	(138.3)
Proceeds from Issuance of Senior Long-term Debt			1,300.0	0.0
Financing activities
Principal payments of debt			(4.9)	(2.3)
Repayments of Senior Debt			(256.3)	(12.5)
Early Repayment of Senior Debt			(300.0)	0.0
Repayments of Debt			(256.3)	(12.5)
Payments Related to Tax Withholding for Share-based Compensation			(15.5)	(13.8)
Debt issuance and financing costs			(23.2)	(0.9)
Increase (Decrease) in Other Operating Assets and Liabilities, Net			(28.3)	208.5
Proceeds from Other Debt			0.0	7.6
Proceeds from (Payments for) Other Financing Activities			0.0	0.0
Payments for Repurchase of Common Stock			(805.8)	(402.1)
Proceeds from subsidiary (payments to Parent) to pay dividends			0.0	0.0
Payments of Dividends			(35.4)	(35.7)
Net cash used in financing activities			(141.1)	(459.7)
Effect of exchange rate changes on cash and cash equivalents			0.2	5.6
Net increase in cash, cash equivalents, and restricted cash for the period			258.4	32.2
Cash and cash equivalents, beginning of period			423.3	697.7
Cash, cash equivalents, and restricted cash, end of period	683.4	726.6	683.4	726.6
Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Operations [Abstract]
Revenue	(128.0)	(136.6)	(462.2)	(458.1)
Operating costs and expenses
Cost of sales	(128.0)	(136.6)	(462.2)	(458.1)
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds		0.0		0.0
Total operating costs and expenses	(128.0)	(136.6)	(462.2)	(458.1)
Interest expense and financing fee amortization	1.2	1.4	3.8	4.5
Other expense, net	(1.2)	(1.4)	(3.8)	(4.5)
Equity in net income of affiliate		(0.2)	(0.6)	(0.3)
Equity in net income of subsidiaries	(190.1)	(167.8)	(510.1)	(314.7)
Net income	(190.1)	(168.0)	(510.7)	(315.0)
Total other comprehensive income (loss)	0.5	(28.1)	31.2	(68.6)
Comprehensive Income, Net of Tax, Attributable to Parent	(189.6)	(196.1)	(479.5)	(383.6)
Assets
Restricted Cash and Cash Equivalents	0.0		0.0		0.0
Accounts receivable, net	(367.7)		(367.7)		(361.3)
Unbilled Receivables, Current	0.0		0.0
Total current assets	(367.7)		(367.7)		(361.3)
Unbilled Receivable, Non Current	0.0		0.0
Investment in subsidiary	(1,802.9)		(1,802.9)		(2,505.9)
Other assets	(218.4)		(218.4)		(258.4)
Total assets	(2,389.0)		(2,389.0)		(3,125.6)
Liabilities
Accounts payable	(367.7)		(367.7)		(361.3)
Billings in Excess of Cost, Current	0.0		0.0
Provision for Loss on Contracts	0.0		0.0
Total current liabilities	(367.7)		(367.7)		(361.3)
Long-term debt	(117.8)		(117.8)		(157.8)
Billings in Excess of Cost, Noncurrent	0.0		0.0
Provision for Loss on Contacts, Non Current	0.0		0.0
Other liabilities	(100.6)		(100.6)		(100.6)
Total equity	(1,802.9)		(1,802.9)		(2,505.9)
Total liabilities and equity	(2,389.0)		(2,389.0)		(3,125.6)
Investing activities
Proceeds from Sales of Assets, Investing Activities				0.0
Payments for (Proceeds from) Other Investing Activities			0.0	0.0
Proceeds from Issuance of Senior Long-term Debt			0.0
Financing activities
Repayments of Senior Debt			0.0	0.0
Early Repayment of Senior Debt			0.0
Payments Related to Tax Withholding for Share-based Compensation			0.0	0.0
Debt issuance and financing costs			0.0
Proceeds from Other Debt				0.0
Proceeds from (Payments for) Other Financing Activities			0.0	0.0
Payments for Repurchase of Common Stock				0.0
Proceeds from subsidiary (payments to Parent) to pay dividends			0.0	0.0
Payments of Dividends			0.0	0.0
Parent Company [Member]
Operating costs and expenses
Selling, general and administrative	2.3	3.9	8.0	8.8
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds		0.0		0.0
Total operating costs and expenses	2.3	3.9	8.0	8.8
Operating income	(2.3)	(3.9)	(8.0)	(8.8)
Income (loss) before income taxes and equity in net loss of affiliates and subsidiaries	(2.3)	(3.9)	(8.0)	(8.8)
Income tax provision	0.4	0.8	1.5	2.7
Income (loss) Before Equity In Net Income (Loss) Of Affiliates and Subsidiaries	(1.9)	(3.1)	(6.5)	(6.1)
Equity in net income of affiliate		0.2	0.6	0.3
Equity in net income of subsidiaries	170.7	150.1	445.3	237.9
Net income	168.8	147.2	439.4	232.1
Total other comprehensive income (loss)	(0.6)	13.8	(16.5)	33.6
Comprehensive Income, Net of Tax, Attributable to Parent	168.2	161.0	422.9	265.7
Assets
Restricted Cash and Cash Equivalents	0.0		0.0		0.0
Unbilled Receivables, Current	0.0		0.0
Unbilled Receivable, Non Current	0.0		0.0
Investment in subsidiary	1,116.4		1,116.4		1,801.5
Total assets	1,116.4		1,116.4		1,801.5
Liabilities
Billings in Excess of Cost, Current	0.0		0.0
Provision for Loss on Contracts	0.0		0.0
Billings in Excess of Cost, Noncurrent	0.0		0.0
Provision for Loss on Contacts, Non Current	0.0		0.0
Total equity	1,116.4		1,116.4		1,801.5
Total liabilities and equity	1,116.4		1,116.4		1,801.5
Investing activities
Proceeds from Sales of Assets, Investing Activities				0.0
Payments for (Proceeds from) Other Investing Activities			0.0	0.0
Proceeds from Issuance of Senior Long-term Debt			0.0
Financing activities
Repayments of Senior Debt			0.0	0.0
Early Repayment of Senior Debt			0.0
Payments Related to Tax Withholding for Share-based Compensation			0.0	0.0
Debt issuance and financing costs			0.0
Proceeds from Other Debt				0.0
Proceeds from (Payments for) Other Financing Activities			805.8	402.1
Payments for Repurchase of Common Stock			(805.8)	(402.1)
Proceeds from subsidiary (payments to Parent) to pay dividends			35.4	35.7
Payments of Dividends			(35.4)	(35.7)
Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Operations [Abstract]
Revenue	305.6	311.8	1,017.6	1,025.4
Operating costs and expenses
Cost of sales	275.2	284.0	915.7	913.5
Selling, general and administrative	3.6	3.6	13.4	10.7
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds		0.0		0.0
Research and development	1.6	0.7	3.5	1.8
Total operating costs and expenses	280.4	288.3	932.6	926.0
Operating income	25.2	23.5	85.0	99.4
Interest expense and financing fee amortization	(1.2)	(1.3)	(4.0)	(4.5)
Other expense, net	(1.0)	(0.7)	(3.6)	(0.7)
Income (loss) before income taxes and equity in net loss of affiliates and subsidiaries	23.0	21.5	77.4	94.2
Income tax provision	(3.6)	(3.7)	(12.6)	(17.4)
Income (loss) Before Equity In Net Income (Loss) Of Affiliates and Subsidiaries	19.4	17.8	64.8	76.8
Equity in net income of affiliate		0.2	0.6	0.3
Net income	19.4	18.0	65.4	77.1
Total other comprehensive income (loss)	0.1	14.3	(14.7)	35.0
Comprehensive Income, Net of Tax, Attributable to Parent	19.5	32.3	50.7	112.1
Assets
Cash and cash equivalents	61.9	38.8	61.9	38.8	58.2	17.6
Restricted Cash and Cash Equivalents	0.0		0.0		0.0
Accounts receivable, net	322.7		322.7		330.9
Unbilled Receivables, Current	45.5		45.5
Inventory	320.9		320.9		439.9
Other current assets	3.0		3.0		3.2
Total current assets	754.0		754.0		832.2
Property, plant and equipment, net	501.9		501.9		519.5
Unbilled Receivable, Non Current	0.0		0.0
Pension assets	21.0		21.0		19.9
Other assets	130.5		130.5		124.5
Total assets	1,407.4		1,407.4		1,496.1
Liabilities
Accounts payable	412.5		412.5		425.4
Accrued expenses	36.4		36.4		29.8
Profit sharing	3.6		3.6		6.1
Current portion of long-term debt	0.9		0.9		0.9
Billings in Excess of Cost, Current	0.0		0.0
Provision for Loss on Contracts	0.0		0.0
Deferred revenue and other deferred credits, short-term	0.5		0.5		1.0
Deferred grant income liability - current	19.4		19.4		21.6
Other current liabilities					7.5
Total current liabilities	473.3		473.3		492.3
Long-term debt	125.5		125.5		167.1
Advance payments, long-term	2.2		2.2
Billings in Excess of Cost, Noncurrent	0.0		0.0
Provision for Loss on Contacts, Non Current	0.0		0.0
Deferred grant income liability - non-current	24.9		24.9		39.3
Deferred revenue and other deferred credits	2.5		2.5		2.8
Other liabilities	12.5		12.5		10.1
Total equity	766.5		766.5		784.5
Total liabilities and equity	1,407.4		1,407.4		1,496.1
Operating activities
Net cash (used in) operating activities			81.3	98.9
Investing activities
Purchase of property, plant and equipment			(28.0)	(16.6)
Proceeds from Sales of Assets, Investing Activities				0.0
Payments for (Proceeds from) Other Investing Activities			0.5	0.0
Net cash used in investing activities			(27.5)	(16.6)
Proceeds from Issuance of Senior Long-term Debt			0.0
Financing activities
Principal payments of debt			(0.6)	(1.6)
Repayments of Senior Debt				0.0
Early Repayment of Senior Debt			0.0
Collection on (repayment of) intercompany debt			(49.7)	(65.1)
Payments Related to Tax Withholding for Share-based Compensation			0.0	0.0
Debt issuance and financing costs			0.0
Proceeds from Other Debt				0.0
Proceeds from (Payments for) Other Financing Activities			0.0	0.0
Payments for Repurchase of Common Stock				0.0
Proceeds from subsidiary (payments to Parent) to pay dividends			0.0	0.0
Payments of Dividends			0.0	0.0
Net cash used in financing activities			(50.3)	(66.7)
Effect of exchange rate changes on cash and cash equivalents			0.2	5.6
Net increase in cash, cash equivalents, and restricted cash for the period			3.7	21.2
Cash and cash equivalents, beginning of period			58.2
Cash, cash equivalents, and restricted cash, end of period	61.9		61.9
Subsidiary Issuer [Member]
Condensed Consolidating Statements of Operations [Abstract]
Revenue	1,636.1	1,573.0
Operating costs and expenses
Cost of sales	1,395.9	1,339.2
Selling, general and administrative	31.4	42.3
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds		0.0		19.9
Research and development	9.2	8.8
Total operating costs and expenses	1,436.5	1,390.3
Operating income	199.6	182.7
Interest expense and financing fee amortization	(24.2)	(10.5)
Other expense, net	9.6	13.1
Income (loss) before income taxes and equity in net loss of affiliates and subsidiaries	185.0	185.3
Income tax provision	(33.7)	(53.0)
Income (loss) Before Equity In Net Income (Loss) Of Affiliates and Subsidiaries	151.3	132.3
Equity in net income of subsidiaries	19.4	17.7
Net income	170.7	150.0
Total other comprehensive income (loss)	(0.6)	13.8
Comprehensive Income, Net of Tax, Attributable to Parent	170.1	163.8
Assets
Cash and cash equivalents	642.0	$ 711.0	642.0	711.0	387.3	$ 700.0
Restricted Cash and Cash Equivalents	0.3		0.3		2.2
Accounts receivable, net	730.1		730.1		752.6
Unbilled Receivables, Current	467.7		467.7
Inventory	610.1		610.1		1,010.0
Other current assets	32.4		32.4		50.3
Total current assets	2,462.1		2,462.1		2,180.2
Property, plant and equipment, net	1,621.1		1,621.1		1,585.8
Unbilled Receivable, Non Current	53.5		53.5
Pension assets	351.3		351.3		327.2
Investment in subsidiary	686.5		686.5		704.4
Other assets	372.8		372.8		298.2
Total assets	5,547.3		5,547.3		5,095.8
Liabilities
Accounts payable	837.6		837.6		629.0
Accrued expenses	317.6		317.6		239.5
Profit sharing	38.4		38.4		103.4
Current portion of long-term debt	24.1		24.1		30.2
Advance payments, short-term	112.7		112.7		100.0
Billings in Excess of Cost, Current	153.5		153.5
Provision for Loss on Contracts	147.3		147.3
Deferred revenue and other deferred credits, short-term	6.6		6.6		63.6
Other current liabilities	68.8		68.8		324.3
Total current liabilities	1,706.6		1,706.6		1,490.0
Long-term debt	1,862.0		1,862.0		1,110.6
Advance payments, long-term	144.2		144.2		231.7
Pension/OPEB obligation	38.4		38.4		40.8
Billings in Excess of Cost, Noncurrent	353.8		353.8
Provision for Loss on Contacts, Non Current	72.6		72.6
Deferred grant income liability - non-current	5.8		5.8
Deferred revenue and other deferred credits	24.3		24.3		158.2
Other liabilities	303.2		303.2		343.1
Total equity	1,036.4		1,036.4		1,721.4
Total liabilities and equity	5,547.3		5,547.3		$ 5,095.8
Operating activities
Net cash (used in) operating activities			486.1	525.7
Investing activities
Purchase of property, plant and equipment			(142.9)	(122.1)
Net cash used in investing activities			(140.6)	(121.7)
Proceeds from Issuance of Senior Long-term Debt			1,300.0
Financing activities
Principal payments of debt			(4.3)	(0.7)
Collection on (repayment of) intercompany debt			49.7	65.1
Payments Related to Tax Withholding for Share-based Compensation			(15.5)	(13.8)
Proceeds from (Payments for) Other Financing Activities			(805.8)	(402.1)
Proceeds from subsidiary (payments to Parent) to pay dividends			(35.4)	(35.7)
Payments of Dividends			0.0	0.0
Net cash used in financing activities			(90.8)	(393.0)
Net increase in cash, cash equivalents, and restricted cash for the period			254.7	11.0
Cash and cash equivalents, beginning of period			365.1
Cash, cash equivalents, and restricted cash, end of period	$ 621.5		621.5
Spirit [Member]
Condensed Consolidating Statements of Operations [Abstract]
Revenue			4,831.3	4,701.1
Operating costs and expenses
Cost of sales			4,147.8	4,307.4
Selling, general and administrative			133.1	130.4
Research and development			27.8	19.4
Total operating costs and expenses			4,308.7	4,477.1
Operating income			522.6	224.0
Interest expense and financing fee amortization			(60.1)	(30.1)
Other expense, net			6.6	37.4
Income (loss) before income taxes and equity in net loss of affiliates and subsidiaries			469.1	231.3
Income tax provision			(88.6)	(70.2)
Income (loss) Before Equity In Net Income (Loss) Of Affiliates and Subsidiaries			380.5	161.1
Equity in net income of subsidiaries			64.8	76.8
Net income			445.3	237.9
Total other comprehensive income (loss)			(16.5)	33.6
Comprehensive Income, Net of Tax, Attributable to Parent			428.8	271.5
Investing activities
Proceeds from Sales of Assets, Investing Activities				0.4
Payments for (Proceeds from) Other Investing Activities			2.3	0.0
Financing activities
Repayments of Senior Debt			(256.3)	(12.5)
Early Repayment of Senior Debt			(300.0)
Debt issuance and financing costs			$ (23.2)	(0.9)
Proceeds from Other Debt				$ 7.6

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Commitments, Contingencies and Guarantees (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 27, 2018	Sep. 27, 2018	Dec. 31, 2017	Sep. 28, 2017	Dec. 31, 2016
Commitments Contingencies And Guarantees [Abstract]
Litigation settlement amount against Boeing	$ 139,000,000
Current Period Forward Loss Recorded		$ (1,700,000)
Service warranty roll forward
Product Warranty And Extraordinary Rework		166,400,000
Charges to costs and expenses	7,200,000
Product Warranty Accrual, Payments	(3,700,000)
Product Warranty And Extraordinary Rework	169,400,000	169,400,000	$ 166,400,000
Product Warranty Extraordinary Rework Accrual Currency Translation Increase Decrease	(500,000)
Commitments Contingencies And Guarantees Textuals [Abstract]
Outstanding amount of guarantees	18,800,000	18,800,000	23,200,000
Restricted Cash and Investments, Noncurrent	20,200,000	20,200,000	20,000,000	$ 20,000,000	$ 19,900,000
Product Liability Accrual, Component Amount	104,300,000	$ 104,300,000	101,000,000
Product Liability Contingency, Loss Exposure in Excess of Accrual, Best Estimate	$ 174,700,000.0		$ 223,000,000.0
Loss Contingency, Allegations		Contractual Terms Clarification. On July 6, 2018, Spirit filed a complaint in Washington Superior Court captioned Spirit AeroSystems, Inc. v. The Boeing Company (No. 18-2-16649-7  SEA).  Spirit is seeking payment of money that Boeing owes Spirit for product ordered by Boeing and delivered by Spirit. As of the date of filing the complaint, Boeing has underpaid Spirit approximately $64.0. Boeing claims to be withholding money due to customer warranty claims, which are technical in nature and largely relate to designs that predate Spirit’s separation from Boeing in 2005.  Spirit disputes its liability for those claims.  Spirit is also asking the court to clarify the parties’ contractual obligations, including that Boeing has no right under the parties’ contracts to withhold money presently due based on disputed warranty claims on past orders. On September 5, 2018, Boeing moved to dismiss three of Spirit’s claims without prejudice and one claim with prejudice. The parties are currently briefing this motion, and the Court has scheduled oral argument for November 16, 2018. Discovery in the case is ongoing.
Loss Contingency, Management's Assessment and Process		On October 1, 2018, the Company received notice of a claim related to factory disruptions. Claims are inherently uncertain as they typically include many unsubstantiated items and factual disputes. As such, the Company does not believe it is possible to develop an estimate of reasonably possible loss for this matter. The Company has requested further information and supporting documentation and will continue to re-evaluate the claim. The Company usually resolves claims received in the ordinary course of business in the context of its broad, long-term relationships.

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Subsequent Event (Details) $ in Millions	9 Months Ended
	Sep. 27, 2018 USD ($)
Debt Instrument [Line Items]
Optional Revolver Commitment	$ 750.0
2018 Amended Restated Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,260.0
2018 Revolver [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	800.0
2018 Term Loan A [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	206.0
Debt Instrument, Periodic Payment, Principal	2.6
Delayed Draw Term Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 250.0