Hexcel (HXL) 10-K 7 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Jan. 31, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	HEXCEL CORP /DE/
Entity Central Index Key	717,605
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 4,694,720,597
Entity Common Stock, Shares Outstanding		89,842,578
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	HXL

Condensed Balance Sheets

Condensed Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 60.1	$ 35.2
Accounts receivable, net	248.7	245.6
Inventories	314	291
Prepaid expenses and other current assets	33.9	35.2
Total current assets	656.7	607
Property, plant and equipment	2,743.9	2,378.4
Less accumulated depreciation	(877.6)	(752.8)
Property, plant and equipment, net	1,866.3	1,625.6
Goodwill and other intangible assets	148.7	72.2
Investments in affiliated companies	47.7	53.1
Other assets	61.5	42.7
Total assets	2,780.9	2,400.6
Current liabilities:
Short-term borrowings	4.3	4.3
Accounts payable	144.1	137.3
Accrued compensation and benefits	73	66.8
Accrued liabilities	40.7	63.5
Total current liabilities	262.1	271.9
Commitments and contingencies (see Note 13)
Long-term debt	805.6	684.4
Retirement obligations	45.4	40
Other non-current liabilities	172.7	159.4
Total liabilities	1,285.8	1,155.7
Stockholders' equity:
Common stock, $0.01 par value, 200.0 shares authorized, 107.8 shares and 106.7 shares issued at December 31, 2017 and 2016, respectively	1.1	1.1
Additional paid-in capital	774.3	738.8
Retained earnings	1,496.1	1,254.7
Accumulated other comprehensive loss	(45)	(174.4)
Total stockholders' equity including treasury stock value	2,226.5	1,820.2
Less – Treasury stock, at cost, 18.2 shares and 15.3 shares at December 31, 2017 and 2016, respectively	(731.4)	(575.3)
Total stockholders' equity	1,495.1	1,244.9
Total liabilities and stockholders' equity	$ 2,780.9	$ 2,400.6

Condensed Balance Sheets (Paren

Condensed Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	107,800,000	106,700,000
Treasury stock, shares	18,200,000	15,300,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 1,973.3	$ 2,004.3	$ 1,861.2
Cost of sales	1,421.5	1,439.7	1,328.4
Gross margin	551.8	564.6	532.8
Selling, general and administrative expenses	151.8	157.6	156.1
Research and technology expenses	49.4	46.9	44.3
Operating income	350.6	360.1	332.4
Interest expense, net	27.4	22.1	14.2
Non-operating expense		0.4
Income before income taxes, and equity in earnings of affiliated companies	323.2	337.6	318.2
Provision for income taxes	42.5	90.3	83
Income before equity in earnings of affiliated companies	280.7	247.3	235.2
Equity in earnings from affiliated companies	3.3	2.5	2
Net income	$ 284	$ 249.8	$ 237.2
Basic net income per common share:	$ 3.13	$ 2.69	$ 2.48
Diluted net income per common share:	$ 3.09	$ 2.65	$ 2.44
Weighted-average common shares:
Basic	90.6	92.8	95.8
Diluted	91.9	94.2	97.2

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 284	$ 249.8	$ 237.2
Currency translation adjustments	99.8	(54.5)	(53.8)
Net unrealized pension and other benefit actuarial (losses) gains and prior service credits (net of tax)	(3.9)	8.1	4.9
Net unrealized gains (losses) on financial instruments (net of tax)	33.5	(4.1)	(5.3)
Total other comprehensive income (loss)	129.4	(50.5)	(54.2)
Comprehensive income	$ 413.4	$ 199.3	$ 183

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock Par	Common Stock Additional Paid-In Capital	Common Stock Accumulated Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Dec. 31, 2014	$ 1,149.9	$ 1	$ 678.5	$ 845.5	$ (69.7)	$ (305.4)
Increase (Decrease) in Stockholders' Equity
Net income	237.2			237.2
Dividends paid on common stock	(38.3)			(38.3)
Change in other comprehensive income – net of tax	(54.2)				(54.2)
Stock based compensation	37.4	0.1	37.3
Acquisition of treasury stock	(152.4)					(152.4)
Balance at Dec. 31, 2015	1,179.6	1.1	715.8	1,044.4	(123.9)	(457.8)
Increase (Decrease) in Stockholders' Equity
Net income	249.8			249.8
Dividends paid on common stock	(39.8)			(39.8)
Change in other comprehensive income – net of tax	(50.5)				(50.5)
Stock based compensation	23		23
Adoption of ASU 2016-09	0.3			0.3
Acquisition of treasury stock	(117.5)					(117.5)
Balance at Dec. 31, 2016	1,244.9	1.1	738.8	1,254.7	(174.4)	(575.3)
Increase (Decrease) in Stockholders' Equity
Net income	284			284
Dividends paid on common stock	(42.6)			(42.6)
Change in other comprehensive income – net of tax	129.4				129.4
Stock based compensation	35.5		35.5
Acquisition of treasury stock	(156.1)					(156.1)
Balance at Dec. 31, 2017	$ 1,495.1	$ 1.1	$ 774.3	$ 1,496.1	$ (45)	$ (731.4)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income	$ 284	$ 249.8	$ 237.2
Reconciliation to net cash provided by operating activities:
Depreciation and amortization	104.5	93.3	76.4
Amortization of deferred financing costs and debt discount	0.7	1.7	1.1
Deferred income taxes	3.8	62.8	53.2
Stock-based compensation	17.6	16.1	17.9
Equity in earnings from affiliated companies	(3.3)	(2.5)	(2)
Excess tax benefits on stock-based compensation			(9.2)
Changes in assets and liabilities:
Decrease (increase) in accounts receivable	20.2	(17.4)	(18.4)
(Increase) decrease in inventories	2.3	10.8	(25)
Increase in prepaid expenses and other current assets	(0.1)	(4.1)	(2.9)
Increase in other non-current assets	(8)	(13.7)	(11.6)
Decrease in accounts payable/accrued liabilities	(2.1)	(7.9)	(10.4)
Increase in other non-current liabilities		8.1	4.3
Other – net	9.1	4.4	(9.6)
Net cash provided by operating activities	428.7	401.4	301
Cash flows from investing activities
Capital expenditures	(278.1)	(327.9)	(305.3)
Acquisitions and investments in affiliated companies	(76)	(38.6)
Net cash used for investing activities	(354.1)	(366.5)	(305.3)
Cash flows from financing activities
Proceeds from issuance of senior notes	398.3		300
Issuance costs related to senior notes	(3.7)
Proceeds from settlements of treasury locks	10
Proceeds from Euro term loan	37.4	26.4
Repayments of Euro term loan	(4.1)
Borrowing from senior unsecured credit facility		78
Repayment of senior unsecured credit facility	(315)		(135)
Proceeds (repayment) of other debt, net	(0.5)	1.1	(1.2)
Deferred financing costs and discount related to long-term debt		(1.7)	(3.6)
Dividends paid	(42.6)	(39.8)	(38.3)
Repurchase of stock	(150.3)	(111.1)	(146.1)
Activity under stock plans	12.2	0.3	13.3
Net cash used for financing activities	(58.3)	(46.8)	(10.9)
Effect of exchange rate changes on cash and cash equivalents	8.6	(4.7)	(3.9)
Net increase (decrease) in cash and cash equivalents	24.9	(16.6)	(19.1)
Cash and cash equivalents at beginning of period	35.2	51.8	70.9
Cash and cash equivalents at end of period	60.1	35.2	51.8
Supplemental data:
Accrual basis additions to property, plant and equipment	$ 284.4	$ 320.2	$ 289

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	Note 1 — Significant Accounting Policies Nature of Operations Hexcel Corporation and its subsidiaries (herein referred to as “Hexcel”, “the Company”, “we”, “us”, or “our”), is a leading advanced composites company. We develop, manufacture, and market lightweight, high-performance structural materials, including carbon fibers, specialty reinforcements, prepregs and other fiber-reinforced matrix materials, honeycomb, adhesives, engineered honeycomb and composite structures, for use in Commercial Aerospace, Space & Defense and Industrial Applications. Our products are used in a wide variety of end applications, such as commercial and military aircraft, space launch vehicles and satellites, wind turbine blades, automotive, a wide variety of recreational products and other industrial applications. We serve international markets through manufacturing facilities, sales offices and representatives located in the Americas, Europe, Asia Pacific, and Africa. We are also a partner in a joint venture in Malaysia, Aerospace Composites Malaysia Sdn. Bhd. (“ACM”), which manufactures composite structures for commercial aerospace applications. Principles of Consolidation The accompanying consolidated financial statements include the accounts of Hexcel Corporation and its subsidiaries after elimination of all intercompany accounts, transactions and profits. At December 31, 2017, we had a 50% equity ownership investment in the joint venture described above, which we accounted for using the equity method of accounting. Use of Estimates Preparation of the accompanying consolidated financial statements and related disclosures in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Cash and Cash Equivalents Cash and cash equivalents include cash on hand and all highly liquid investments with an original maturity of three months or less when purchased. Our cash equivalents are held in prime money market investments with strong sponsor organizations which are monitored on a continuous basis. Inventories Inventories are stated at the lower of cost or net realizable value, with cost determined using the average cost methods. Inventory is reported at its estimated net realizable value based upon our historical experience with inventory becoming obsolete due to age, changes in technology and other factors. Property, Plant and Equipment Property, plant and equipment, including capitalized interest applicable to major project expenditures, is recorded at cost. Asset and accumulated depreciation accounts are eliminated for dispositions, with resulting gains or losses reflected in earnings. Depreciation of plant and equipment is provided using the straight-line method over the estimated useful lives of the various assets. The estimated useful lives range from 10 to 40 years for buildings and improvements and from 3 to 25 years for machinery and equipment. Repairs and maintenance are expensed as incurred, while major replacements and betterments are capitalized and depreciated over the remaining useful life of the related asset. Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price over the fair value of the identifiable net assets of an acquired business. Goodwill is tested for impairment at the reporting unit level annually, or when events or changes in circumstances indicate that goodwill might be impaired. The Company’s annual test for goodwill impairment was performed in the fourth quarter of 2017. The Company performed a qualitative assessment (“Step Zero”) and determined that it was more likely than not that the fair values of our reporting units were not less than their carrying values and it was not necessary to perform a quantitative (“Step 1”) goodwill impairment test. We amortize the cost of other intangibles over their estimated useful lives unless such lives are deemed indefinite. We have indefinite lived intangible assets which are not amortized but are tested annually for impairment during the fourth quarter of each year, or when events or changes in circumstances indicate the potential for impairment. If the carrying amount of the indefinite lived intangible exceeds the fair value, it is written down to its fair value, which is calculated using a discounted cash flow model (“DCF”). Impairment of Long-Lived Assets The Company reviews long-lived assets, including property, plant and equipment and definite-lived intangible assets, for impairment whenever changes in circumstances or events may indicate that the carrying amounts are not recoverable. These indicators include, but are not limited to: a significant decrease in the market price of a long-lived asset, a significant change in the extent or manner in which a long-lived asset is used or its physical condition, a significant adverse change in legal factors or business climate that could affect the value of a long-lived asset, an accumulation of costs significantly in excess of the amount expected for the acquisition or construction of a long-lived asset, a current period operating or cash flow loss combined with a history of losses associated with a long-lived asset and a current expectation that, more likely than not, a long-lived asset will be sold or otherwise disposed of significantly before the end of its previously estimated life. Software Development Costs Costs incurred to develop software for internal-use are accounted for under ASC 350-40, “Internal-Use Software.” Debt Financing Costs Debt financing costs are deferred and amortized to interest expense over the life of the related debt. We capitalize financing fees related to our revolving credit facility and record them as a non-current asset in our consolidated balance sheets. Financing fees related to our bonds and notes are capitalized and recorded as a non-current liability (contra liability) in our consolidated balance sheets. At December 31, 2017 and 2016, deferred financing costs, recorded as a non-current asset were $3.1 million and $4.0 million, respectively, and net deferred financing costs recorded as non-current liability were $5.5 million, and $2.5 million, respectively. Share-Based Compensation The fair value of Restricted Stock Units (“RSUs”) is equal to the market price of our stock at date of grant and is amortized to expense ratably over the vesting period. Performance restricted stock units (“PRSUs”) are a form of RSUs in which the number of shares ultimately received depends on the extent to which we achieve a specified performance target. The fair value of the PRSU is based on the closing market price of the Company’s common stock on the date of grant and is amortized straight-line over the total vesting period. A change in the performance measure expected to be achieved is recorded as an adjustment in the period in which the change occurs. We use the Black-Scholes model to calculate the fair value for all stock option grants, based on the inputs relevant on the date granted, such as the market value of our shares, prevailing risk-free interest rate, etc. The value of the portion of the award, after considering potential forfeitures, that is ultimately expected to vest is recognized as expense in our consolidated statements of operations on a straight-line basis over the requisite service periods. The value of RSU’s, PRSU’s and non-qualifying options awards for retirement eligible employees is expensed on the grant date as they are fully vested. Currency Translation The assets and liabilities of international subsidiaries are translated into U.S. dollars at year-end exchange rates, and revenues and expenses are translated at average exchange rates during the year. Cumulative currency translation adjustments are included in “accumulated other comprehensive loss” in the Stockholders’ Equity section of the consolidated balance sheets. Revenue Recognition Our revenue is predominately derived from sales of inventory, and is recognized when persuasive evidence of an arrangement exists, title and risk of loss passes to the customer, the sales price is fixed or determinable, and collectability is reasonably assured. However, from time to time we enter into contractual arrangements for which other specific revenue recognition guidance is applied. Revenues derived from design and installation services are recognized when the service is provided. Revenues derived from long-term construction-type contracts are accounted for using the percentage-of-completion method, and progress is measured on a cost-to-cost basis. If at any time expected costs exceed the value of the contract, the loss is recognized immediately. Shipping and handling fees and costs incurred in connection with products sold are recorded in cost of sales in our Consolidated Statements of Operations. Product Warranty We provide for an estimated amount of product warranty at the point a claim is probable and estimable. This estimated amount is provided by product and based on current facts, circumstances and historical warranty experience. Research and Technology Significant costs are incurred each year in connection with research and technology (“R&T”) programs that are expected to contribute to future earnings. Such costs are related to the development and, in certain instances, the qualification and certification of new and improved products and their uses. R&T costs are expensed as incurred. Income Taxes We provide for income taxes using the asset and liability approach . Concentration of Credit Risk Financial instruments that potentially subject us to significant concentrations of credit risk consist primarily of trade accounts receivable. Two customers and their related subcontractors accounted for approximately 69% our annual net sales in 2017, 69% in 2016, and 66% in 2015. Refer to Note 16 for further information on significant customers. We perform ongoing credit evaluations of our customers’ financial condition but generally do not require collateral or other security to support customer receivables. We establish an allowance for doubtful accounts based on factors surrounding the credit risk of specific customers, historical trends and other financial information. As of December 31, 2017 and 2016, the allowance for doubtful accounts was $0.3 million and $0.4 million, respectively. Bad debt expense was immaterial for all years presented. Derivative Financial Instruments We use various financial instruments, including foreign currency forward exchange contracts and interest rate agreements, to manage our exposure to market fluctuations by generating cash flows that offset, in relation to their amount and timing, the cash flows of certain foreign currency denominated transactions or underlying debt instruments. We mark our foreign exchange forward contracts to fair value. When the derivatives qualify, we designate our foreign currency forward exchange contracts as cash flow hedges against forecasted foreign currency denominated transactions and report the effective portions of changes in fair value of the instruments in “accumulated other comprehensive loss” until the underlying hedged transactions affect income. We designate our interest rate agreements as fair value or cash flow hedges against specific debt instruments and recognize interest differentials as adjustments to interest expense as the differentials may occur; the fair value of the interest rate swaps is recorded in other assets or other long-term liabilities with a corresponding amount to “accumulated other comprehensive loss”. We do not use financial instruments for trading or speculative purposes. In accordance with accounting guidance, we recognize all derivatives as either assets or liabilities on our balance sheet and measure those instruments at fair value. Self-insurance We are self-insured up to specific levels for certain medical and health insurance and workers’ compensation plans. Accruals are established based on actuarial assumptions and historical claim experience, and include estimated amounts for incurred but not reported claims. New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2014-09 (ASU 2014-09), “ Revenue from Contracts with Customers”. We have identified certain contracts under which we produce products with no alternative use and for which we have an enforceable right to payment during the production cycle. As a result, we will be required to record revenue for these contracts over time as opposed to at the time of shipment as we do today. We are adopting the provisions of this new standard using the modified retrospective method which allows companies to record a one time adjustment to opening retained earnings for the cumulative effect the standard will have on open contracts at the time of adoption. Upon adoption, we expect to accelerate approximately $40 million of revenue resulting in a less than $4 million adjustment to our 2018 opening retained earnings. In July 2015, the FASB issued Accounting Standards Update No.2015-11 (“ASU 2015-11”), Simplifying the Measurement of Inventory. In February 2016, the FASB issued Accounting Standards Update No. 2016-02 (ASU 2016-02), Leases In August of 2016, the FASB issued Accounting Standards Update No. 2016-15 (ASU 2016-15) "Classification of Certain Cash Receipts and Cash Payments” In January 2017, the FASB issued Accounting Standards Update No. 2017-04 (ASU 2017-04), Simplifying the test for Goodwill Impairment, In March 2017, the FASB issued Accounting Standards Update No. 2017-07 (ASU 2017-07), Compensation-Retirement Benefits, In August 2017, the FASB issued Accounting Standards Update No. 2017-12 (ASU 2017-12), Targeted Improvement to Accounting for Hedging Activities,

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Note 2 — Inventories December 31, (In millions) 2017 2016 Raw materials $ 126.7 $ 120.6 Work in progress 52.1 53.7 Finished goods 135.2 116.7 Total inventory $ 314.0 $ 291.0

Net Property, Plant and Equipme

Net Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Net Property, Plant and Equipment	Note 3 — Net Property, Plant and Equipment December 31, (In millions) 2017 2016 Land $ 96.7 $ 63.8 Buildings 624.2 523.2 Equipment 1,698.5 1,336.9 Construction in progress 322.0 454.4 Capital lease 2.5 0.1 Property, plant and equipment 2,743.9 2,378.4 Less accumulated depreciation (877.6 ) (752.8 ) Net property, plant and equipment $ 1,866.3 $ 1,625.6 Depreciation expense related to property, plant and equipment for the years ended December 31, 2017, 2016 and 2015, was $103.5 million, $93.3 million and $76.4 million, respectively. Capitalized interest of $3.1 million and $1.9 million for 2017 and 2016, respectively, was included in construction in progress and is associated with our carbon fiber expansion programs. Capitalized costs associated with software developed for internal use were not material for 2017 and 2016.

Goodwill and Purchased Intangib

Goodwill and Purchased Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Purchased Intangible Assets	Note 4 — Goodwill and Purchased Intangible Assets Changes in the carrying amount of gross goodwill and other purchased intangibles for the years ended December 31, 2017 and 2016, by segment, are as follows (In millions) Composite Materials Engineered Products Total Balance as of December 31, 2015 $ 42.8 $ 16.1 $ 58.9 Amortization expense (0.3 ) — (0.3 ) Additions 18.1 — 18.1 Currency translation adjustments and other (4.5 ) — (4.5 ) Balance as of December 31, 2016 $ 56.1 $ 16.1 $ 72.2 Amortization expense (1.0 ) — (1.0 ) Additions 41.2 28.9 70.1 Currency translation adjustments and other 7.4 — 7.4 Balance as of December 31, 2017 $ 103.7 $ 45.0 $ 148.7 We performed our annual impairment review of goodwill as of November 30, 2017 and determined that it was more likely than not that the fair values of our reporting units are above their carrying values. The goodwill and intangible asset balances as of December 31, 2017 include $5.1 million of indefinite-lived intangible assets, $33.5 million of a definite-lived intangible asset and $110.1 million of goodwill. The increase in goodwill is due to the Structil and OPM acquisitions discussed in the acquisitions note. Of the $110.1 million of goodwill, $76.9 million is allocated to the Composite Materials segment and $33.2 million to the Engineered Products Amortization related to the definite lived intangible assets for the next five years and thereafter is as follows: $2.7 million for 2018 through 2022, and $20.2 million thereafter.

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	Note 5 - Debt December 31, December 31, (In millions) 2017 2016 Current portion of capital lease $ — $ 0.5 Current portion of Euro term loan 4.3 3.8 Current portion of debt 4.3 4.3 Senior unsecured credit facility — due 2021 50.0 365.0 Euro term loan 63.3 22.6 4.7% senior notes — due 2025 300.0 300.0 3.95% senior notes — due 2027 400.0 — Senior notes – original issue discount (2.3 ) (0.7 ) Senior notes – deferred financing costs (5.5 ) (2.5 ) Other debt 0.1 — Long-term debt 805.6 684.4 Total debt $ 809.9 $ 688.7 3.95% Senior Notes In February 2017, the Company issued $400 million in aggregate principal amount of 3.95% Senior Unsecured Notes due in 2027. The interest rate on these senior notes may be increased by 0.25% each time a credit rating applicable to the notes is downgraded. The maximum rate is 5.95%. The net proceeds of approximately $394.6 million were initially used to repay, in part, $350 million of our Senior Unsecured Revolving Credit Facility (the “Facility”) and the remainder was used for general purposes including share repurchases. The effective interest rate for 2017 was 3.87% inclusive of approximately a 0.25% benefit of treasury locks. The fair value of the senior notes due in 2027 based on quoted prices utilizing Level 2 inputs was $410.0 million at December 31, 2017. Senior Unsecured Credit Facility In June 2016, the Company amended and extended its $700 million Facility. The maturity of the Facility was extended from September 2019 to June 2021. The amendment provided for a modest reduction in interest costs, as well as less restrictive covenants. The interest rate for the revolver at December 31, 2017 is LIBOR + 1.25%. The interest rate ranges from LIBOR + 0.875% to a maximum of LIBOR + 1.875%, depending upon the Company’s leverage ratio. The Facility contains financial and other covenants, including, but not limited to, restrictions on the incurrence of debt and the granting of liens, as well as the maintenance of an interest coverage ratio and a leverage ratio. In accordance with the terms of the Facility, we are required to maintain a minimum interest coverage ratio of 3.50 (based on the ratio of EBITDA, as defined in the Credit Agreement, to interest expense) and may not exceed a maximum leverage ratio of 3.50 (based on the ratio of total debt to EBITDA) throughout the term of the Facility. In addition, the Facility contains other terms and conditions such as customary representations and warranties, additional covenants and customary events of default. As of December 31, 2017, total borrowings under our $700 million Facility were $50.0 million, which approximates fair value using Level 2 inputs. The Facility permits us to issue letters of credit up to an aggregate amount of $40 million. Outstanding letters of credit reduce the amount available for borrowing under our revolving loan. As of December 31, 2017, there were no outstanding letters of credit under the Facility, resulting in undrawn availability under the Facility as of December 31, 2017 of $650.0 million. During 2017, the Company utilized its Facility at various borrowing levels with $451 million representing the largest amount outstanding during the year. 4.7% Senior Notes In 2015, the Company issued $300 million in aggregate principal amount of 4.7% Senior Unsecured Notes due in 2025. The interest rate on these senior notes may be increased by 0.25% each time a credit rating applicable to the notes is downgraded. The maximum rate is 6.7% and the rate at December 31, 2017 remained at 4.7%. The net proceeds of approximately $296.4 million were initially used to repay, in part, our Facility. The conditions and covenants related to the senior notes are less restrictive than those of our Facility. The effective interest rate for 2017 was 4.84%. The fair value of the senior notes based on quoted prices utilizing level 2 inputs was $321.0 million at December 31, 2017. The balance for unamortized deferred financing costs and debt discount related to the senior notes was $2.8 million at December 31, 2017 and $3.2 million at December 31, 2016. Other Credit Facilities In June 2016, we also entered into a € € o We have a $10.0 million revolving credit line for working capital needs of our Chinese entity with no outstanding balance at December 31, 2017. These funds can only be used locally. The facility is guaranteed by Hexcel Corporation, but is uncommitted and cancellable by the lender at any time.

Leasing Arrangements

Leasing Arrangements	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Leasing Arrangements	Note 6 — Leasing Arrangements Certain sales and administrative offices, data processing equipment and manufacturing facilities are leased under operating leases. We recognize rental expense on operating leases straight-line over the term of a lease. Total rental expense was $12.0 million in 2017, $11.4 million in 2016 and $10.2 million in 2015. Scheduled future minimum lease payments as of December 31, 2017 were: (In millions) Payable during the years ending December 31: Operating Leases 2018 $ 10.6 2019 8.9 2020 6.9 2021 6.0 2022 1.8 Thereafter 2.4 Total minimum lease payments $ 36.6

Retirement and Other Postretire

Retirement and Other Postretirement Benefit Plans	12 Months Ended
	Dec. 31, 2017
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]
Retirement and Other Postretirement Benefit Plans	Note 7 — Retirement and Other Postretirement Benefit Plans We maintain qualified defined benefit retirement plans covering certain current and former European employees, as well as nonqualified defined benefit retirement plans and retirement savings plans covering certain eligible U.S. and European employees, and participate in a union sponsored multi-employer pension plan covering certain U.S. employees with union affiliations. In addition, we provide certain postretirement health care and life insurance benefits to eligible U.S. retirees. Accounting standards require the use of certain assumptions, such as the expected long-term rate of return, discount rate, rate of compensation increase, healthcare cost trend rates, and retirement and mortality rates, to determine the net periodic costs of such plans. These assumptions are reviewed and set annually at the beginning of each year. In addition, these models use an “attribution approach” that generally spreads individual events, such as plan amendments and changes in actuarial assumptions, over the service lives of the employees in the plan. That is, employees render service over their service lives on a relatively smooth basis and therefore, the income statement effects of retirement and postretirement benefit plans are earned in, and should follow, the same pattern. We use our actual return experience, future expectations of long-term investment returns, and our actual and targeted asset allocations to develop our expected rate of return assumption used in the net periodic cost calculations of our funded European defined benefit retirement plans. Due to the difficulty involved in predicting the market performance of certain assets, there will be a difference in any given year between our expected return on plan assets and the actual return. Following the attribution approach, each year’s difference is amortized over a number of future years. Over time, the expected long-term returns are designed to approximate the actual long-term returns and therefore result in a pattern of income and expense recognition that more closely matches the pattern of the services provided by the employees. We annually set our discount rate assumption for retirement-related benefits accounting to reflect the rates available on high-quality, fixed-income debt instruments. The rate of compensation increase for nonqualified pension plans, which is another significant assumption used in the actuarial model for pension accounting, is determined by us based upon our long-term plans for such increases and assumed inflation. For the postretirement health care and life insurance benefits plan, we review external data and its historical trends for health care costs to determine the health care cost trend rates. Retirement and termination rates are based primarily on actual plan experience. The mortality table used for the U.S. plans is based on the RP-2014 White Collar Healthy Annuitant Mortality Table with Improvement Scale MP-2016 and for the U.K. Plan the S2PXA base table with future improvements in line with the CMI 2014 projection model with a long term trend rate of 1.5% p.a. Actual results that differ from our assumptions are accumulated and amortized over future periods and, therefore, generally affect the net periodic costs and recorded obligations in such future periods. While we believe that the assumptions used are appropriate, significant changes in economic or other conditions, employee demographics, retirement and mortality rates, and investment performance may materially impact such costs and obligations. U.S. Defined Benefit Retirement Plans We have nonqualified defined benefit retirement plans covering certain current and former U.S. employees that are funded as benefits are incurred. Under the provisions of these plans, we expect to contribute approximately $4.6 million in 2018 to cover unfunded benefits. Multi-Employer Plan The Company is party to a multi-employer pension plan covering certain U.S. employees with union affiliations. The plan is the Western Metal Industry Pension Fund, (“the Plan”). The Plan’s employer identification number is 91-6033499; the Plan number is 001. In 2017, 2016 and 2015 the Plan reported Hexcel Corporation as being an employer that contributed greater than 5% of the Plan’s total contributions. The expiration date of the collective bargaining agreement is September 30, 2020. The Plan has been listed in “critical status” and has been operating in accordance with a Rehabilitation Plan since 2010. The Plan, as amended under the Rehabilitation Plan, reduced the adjustable benefits of the participants and levied a surcharge on employer contributions. The Company contributed $1.9 million in 2017, $2.1 million in 2016 and approximately $2.2 million in 2015. We expect the Company’s contribution to be about $2.1 million in 2018 and remain at that level over the next few years. U.S. Retirement Savings Plan Under the retirement savings plan, eligible U.S. employees can contribute up to 75% of their annual compensation to an individual 401(k) retirement savings account. The Company makes matching contributions equal to 50% of employee contributions, not to exceed 3% of employee compensation each year. We also contribute an additional 2% to 4% of each eligible U.S. employee’s salary to an individual 401(k) retirement savings account. This increases the maximum contribution to individual U.S. employee savings accounts to between 5% and 7% per year, before any profit sharing contributions that are made when we meet or exceed certain performance targets that are set annually. These profit sharing contributions are made at the Company’s discretion and are targeted at 3% of an eligible U.S. employee’s pay, with a maximum of 4.5%. U.S. Postretirement Plans In addition to defined benefit and retirement savings plan benefits, we also provide certain postretirement health care and life insurance benefits to eligible U.S. retirees. Depending upon the plan, benefits are available to eligible employees who retire after meeting certain age and service requirements and were employed by Hexcel as of February 1996. Our funding policy for the postretirement health care and life insurance benefit plans is generally to pay covered expenses as they are incurred. Under the provisions of these plans, we expect to contribute approximately $0.5 million in 2018 to cover unfunded benefits. European Defined Benefit Retirement Plans We have defined benefit retirement plans in the United Kingdom, Belgium, France and Austria covering certain employees of our subsidiaries in those countries. The defined benefit plan in the United Kingdom (the “U.K. Plan”), the largest of the European plans, was terminated in 2011 and replaced with a defined contribution plan. As of December 31, 2017, 28% of the total assets in the U.K. Plan were invested in equities and 24% of the total assets were invested in diversified growth funds and 19% were invested in liability driven investments. Equity investments and growth fund investments are made with the objective of achieving a return on plan assets consistent with the funding requirements of the plan, maximizing portfolio return and minimizing the impact of market fluctuations on the fair value of the plan assets. Liability driven investments are made to reduce balance sheet volatility. As a result of an annual review of historical returns and market trends, the expected long-term weighted average rate of return for the U.K. Plan for the 2017 plan year will be 4.75% and 3.0% for the other European plans as a group. U.K. Defined Contribution Pension Plan Under the Defined Contribution Section, eligible U.K. employees can belong to the Deferred Contribution Plan on a non-participatory basis or can elect to contribute 3%, 5% or 7% of their pensionable salary. The Company will contribute 5%, 9% and 13% respectively. The plan also provides life insurance and disability insurance benefits for members. Retirement and Other Postretirement Plans - France The employees of our French subsidiaries are entitled to receive a lump-sum payment upon retirement subject to certain service conditions under the provisions of the national chemicals and textile workers collective bargaining agreements. The amounts attributable to the French plans have been included within the total expense and obligation amounts noted for the European plans. Net Periodic Pension Expense Net periodic expense for our U.S. and European qualified and nonqualified defined benefit pension plans and our retirement savings plans for the three years ended December 31, 2017 is detailed in the table below. (In millions) 2017 2016 2015 Defined benefit retirement plans $ 0.6 $ 1.6 $ 2.7 Union sponsored multi-employer pension plan 1.9 2.1 2.2 Retirement savings plans-matching contributions 9.7 7.9 4.2 Retirement savings plans-profit sharing contributions 9.2 10.6 9.7 Net periodic expense $ 21.4 $ 22.2 $ 18.8 Defined Benefit Retirement and Postretirement Plans Net periodic cost of our defined benefit retirement and postretirement plans for the three years ended December 31, 2017, were: (In millions) U.S. Plans European Plans Defined Benefit Retirement Plans 2017 2016 2015 2017 2016 2015 Service cost $ 1.3 $ 1.2 $ 1.1 $ 1.0 $ 0.8 $ 0.8 Interest cost 0.6 0.6 0.5 4.6 5.4 6.1 Expected return on plan assets — — — (8.4 ) (7.6 ) (8.4 ) Net amortization 0.4 0.3 1.0 0.3 0.6 0.8 Termination benefits and settlement losses 0.7 0.2 0.8 0.1 0.1 — Net periodic pension cost (income) $ 3.0 $ 2.3 $ 3.4 $ (2.4 ) $ (0.7 ) $ (0.7 ) (In millions) U.S. Postretirement Plans 2017 2016 2015 Interest cost $ 0.1 $ 0.2 $ 0.2 Net amortization and deferral 0.1 (0.7 ) (0.6 ) Net periodic postretirement benefit loss (income) $ 0.2 $ (0.5 ) $ (0.4 ) Defined Benefit Retirement Plans U.S. Plans European Plans Postretirement Plans (In millions) 2017 2016 2017 2016 2017 2016 Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income Net loss (gain) $ 0.1 $ 0.1 $ 2.3 $ (5.0 ) $ — $ (0.9 ) Amortization of actuarial (losses) gains (0.8 ) (0.3 ) (0.4 ) (0.7 ) 1.1 0.7 Effect of foreign exchange — — 2.5 (4.0 ) — — Total recognized in other comprehensive income (pre-tax) $ (0.7 ) $ (0.2 ) $ 4.4 $ (9.7 ) $ 1.1 $ (0.2 ) The Company expects to recognize $0.2 million of net actuarial loss and an immaterial net prior service cost as a component of net periodic pension cost in 2018 for its defined benefit plans. The amount of net actuarial gain recognized as a component of net periodic postretirement benefit cost in 2018 is expected to be $1.0 million. The benefit obligation, fair value of plan assets, funded status, and amounts recognized in the consolidated financial statements for our defined benefit retirement plans and postretirement plans, as of and for the years ended December 31, 2017 and 2016, were: Defined Benefit Retirement Plans U.S. Plans European Plans Postretirement Plans (In millions) 2017 2016 2017 2016 2017 2016 Change in benefit obligation: Benefit obligation - beginning of year $ 19.7 $ 17.7 $ 164.1 $ 162.8 $ 4.4 $ 5.3 Service cost 1.3 1.2 1.0 0.8 — — Interest cost 0.6 0.6 4.6 5.4 0.1 0.2 Plan participants’ contributions — — — — 0.2 0.1 Actuarial loss (gain) 0.1 0.2 6.8 27.7 — (1.0 ) Acquisitions — — 1.0 — — — Termination benefits and settlements 0.2 0.2 (0.6 ) (0.2 ) — — Benefits and expenses paid (0.5 ) (0.2 ) (4.6 ) (5.1 ) (0.6 ) (0.2 ) Currency translation adjustments — — 17.2 (27.3 ) — — Benefit obligation - end of year $ 21.4 $ 19.7 $ 189.5 $ 164.1 $ 4.1 $ 4.4 Change in plan assets: Fair value of plan assets - beginning of year $ — $ — $ 171.4 $ 160.4 $ — $ — Actual return on plan assets — — 12.9 40.3 — — Employer contributions 0.5 0.2 5.3 6.3 0.5 0.1 Plan participants’ contributions — — — — 0.2 0.1 Benefits and expenses paid (0.5 ) (0.2 ) (4.6 ) (5.1 ) (0.7 ) (0.2 ) Termination benefits and settlements — — (0.6 ) (0.2 ) — — Currency translation adjustments — — 17.4 (30.3 ) — — Fair value of plan assets - end of year $ — $ — $ 201.8 $ 171.4 $ — $ — Amounts recognized in Consolidated Balance Sheets: Noncurrent Assets $ — $ — $ 32.2 $ 23.9 $ — $ — $ 4.5 $ 1.1 $ 0.3 $ 0.4 $ 0.5 $ 0.5 Non-current liabilities 16.9 18.6 19.6 16.2 3.6 3.9 Total Liabilities $ 21.4 $ 19.7 $ 19.9 $ 16.6 $ 4.1 $ 4.4 Amounts recognized in Accumulated Other Comprehensive Loss: Actuarial net (loss) gain $ (3.1 ) $ (3.8 ) $ (26.6 ) $ (22.1 ) $ 3.3 $ 4.3 Prior service cost — — (0.1 ) (0.1 ) — — Total amounts recognized in accumulated other comprehensive loss $ (3.1 ) $ (3.8 ) $ (26.7 ) $ (22.2 ) $ 3.3 $ 4.3 The measurement date used to determine the benefit obligations and plan assets of the defined benefit retirement and postretirement plans was December 31, 2017. The total accumulated benefit obligation (“ABO”) for the U.S. defined benefit retirement plans was $21.0 million and $17.9 million as of December 31, 2017 and 2016, respectively. Excluding the U.K. Plan, the European plans’ ABO exceeded plan assets as of December 31, 2017 and 2016, by $14.3 million and $12.0 million, respectively. These plans’ ABO was $20.9 million and $17.7 million as of December 31, 2017 and 2016, respectively. The U.K. Plan is overfunded; the ABO of this plan was $163.1 million and $141.8 million at December 31, 2017 and 2016, respectively. The fair value of the U.K. Plan assets was $195.3 million and $165.7 million at December 31, 2017 and 2016, respectively. As of December 31, 2017 and 2016, the accrued benefit costs for the defined benefit retirement plans and postretirement benefit plans included within “accrued compensation and benefits” was $5.3 million and $2.0 million, respectively, and within “other non-current liabilities” was $40.1 million and $38.8 million, respectively, in the accompanying consolidated balance sheets. Benefit payments for the plans are expected to be as follows: European Postretirement (In millions) U.S. Plans Plans Plans 2018 $ 4.6 $ 4.7 $ 0.5 2019 1.0 4.9 0.5 2020 2.7 5.2 0.5 2021 2.9 7.2 0.5 2022 1.2 6.6 0.5 2023-2027 14.4 41.0 1.5 $ 26.8 $ 69.6 $ 4.0 Fair Values of Pension Assets The following table presents pension assets measured at fair value at December 31, 2017 and 2016 utilizing the fair value hierarchy discussed in Note 19: Fair Value Measurements at (In millions) December 31, December 31, 2017 Description 2017 Level 1 Level 2 Level 3 Equity funds $ 56.3 $ — $ 56.3 $ — Diversified growth funds 48.0 — 48.0 — Insurance contracts 4.2 — — 4.2 Liability driven investments 38.7 — 38.7 — Index linked gilts 52.1 — 52.1 — Diversified investment funds 2.3 — — 2.3 Cash and cash equivalents 0.2 0.2 — — Total assets $ 201.8 $ 0.2 $ 195.1 $ 6.5 Fair Value Measurements at December 31, December 31, 2016 Description 2016 Level 1 Level 2 Level 3 Equity funds $ 53.8 $ — $ 53.8 $ — Diversified growth funds 41.2 — 41.2 — Index linked gilts 36.1 — 36.1 — Liability driven investments 34.4 — 34.4 — Insurance contracts 3.6 — — 3.6 Diversified investment funds 2.1 — — 2.1 Cash and cash equivalents 0.2 0.2 — — Total assets $ 171.4 $ 0.2 $ 165.5 $ 5.7 The pooled fund that the U.K. plan invests in is structured as unit-linked life assurance vehicles which are not exchange listed. As the prices for these are not quoted in an active market at the reporting date, the investment managers advised they believe these funds cannot be classified as Level I investments. The investment managers have deemed its pooled funds as being most suitably classified as Level 2 given its valuation methodology and pricing. (In millions) Balance at Actual Purchases, Changes due Balance at January 1, return on sales and to exchange December 31, Reconciliation of Level 3 Assets 2017 plan assets settlements rates 2017 Diversified investment funds $ 2.1 $ 0.1 $ (0.2) $ 0.3 $ 2.3 Insurance contracts 3.6 0.2 (0.1) 0.5 4.2 Total level 3 assets $ 5.7 $ 0.3 $ (0.3) $ 0.8 $ 6.5 Balance at Actual Purchases, Changes due Balance at January 1, return on sales and to exchange December 31, Reconciliation of Level 3 Assets 2016 plan assets settlements rates 2016 Diversified investment funds $ 2.1 $ 0.1 $ — $ (0.1) $ 2.1 Insurance contracts 3.5 0.2 — (0.1) 3.6 Total level 3 assets $ 5.6 $ 0.3 $ — $ (0.2) $ 5.7 Plan assets are invested in a number of unit linked pooled funds by an independent asset management group. Equity funds are split 40/60 between U.K. and overseas equity funds (North America, Japan, Asia Pacific and Emerging Markets). The asset management firm uses quoted prices in active markets to value the assets. Diversified growth funds are invested in a broad spectrum of return seeking asset classes with reduced dependency on any particular asset class. This approach targets growth asset returns with lower risk resulting from the diversification across different asset classes. The index-linked gilt allocation provides a partial interest rate and inflation rate hedge against the valuation of the liabilities. The liability driven investments’ allocation aims to hedge against the exposure to interest rate risk through the use of interest rate swaps. The Bond Allocation is invested in a number of Active Corporate Bond funds which are pooled funds. The Corporate Bond funds primarily invest in corporate fixed income securities denominated in British pounds sterling with credit ratings of BBB- and above. We use quoted prices in active markets to value the assets. Insurance contracts contain a minimum guaranteed return. The fair value of the assets is equal to the total amount of all individual technical reserves plus the non-allocated employer’s financing fund reserves at the valuation date. The individual technical and financing fund reserves are equal to the accumulated paid contributions taking into account the insurance tarification and any allocated profit sharing return. The diversified investment funds represent plan assets invested in a Pensionskasse (an Austrian multi-employer pension fund). The main holdings consist of equity, bonds, real estate and bank deposits. The actual allocations for the pension assets at December 31, 2017 and 2016, and target allocations by asset class, are as follows: Percentage Target Percentage Target Of Plan Assets Allocations Of Plan Assets Allocations Asset Class 2017 2017 2016 2016 Diversified growth funds 23.8 % 28.1 % 24.1 % 29.0 % Index linked gilts 25.8 12.6 21.1 13.0 Liability driven investments 19.2 23.2 20.1 24.0 All Other Regions Equity Fund 16.6 19.6 18.7 34.0 U.K. Equity Fund 11.2 13.3 12.6 — Diversified Investment Funds 1.2 1.2 1.2 — Insurance Contracts 2.1 2.0 2.1 — Cash and cash equivalents 0.1 — 0.1 — Total 100 % 100 % 100 % 100 % Assumptions The assumed discount rate for pension plans reflects the market rates for high-quality fixed income debt instruments currently available. A third party provided standard Yield Curve was used for the U.S. non-qualified and postretirement plans. For the U.K. plan, cash flows were not available and therefore we considered the derived yield to market on a representative bond of suitable duration taken from the third party provider’s synthetic bond yield curve. We believe that the timing and amount of cash flows related to these instruments is expected to match the estimated defined benefit payment streams of our plans. The assumed discount rate for the U.S. non-qualified plans uses individual discount rates for each plan based on their associated cash flows. Salary increase assumptions are based on historical experience and anticipated future management actions. For the postretirement health care and life insurance benefit plans, we review external data and our historical trends for health care costs to determine the health care cost trend rates. Retirement rates are based primarily on actual plan experience and on rates from previously mentioned mortality tables. Actual results that differ from our assumptions are accumulated and amortized over future periods and, therefore, generally affect the net periodic costs and recorded obligations in such future periods. While we believe that the assumptions used are appropriate, significant changes in economic or other conditions, employee demographics, retirement and mortality rates, and investment performance may materially impact such costs and obligations. Assumptions used to estimate the actuarial present value of benefit obligations at December 31, 2017, 2016 and 2015 are shown in the following table. These year-end values are the basis for determining net periodic costs for the following year. 2017 2016 2015 U.S. defined benefit retirement plans: Discount rates 2.8% - 3.2% 3.1% - 3.6% 3.2% - 3.7% Rate of increase in compensation 3.0% 3.0% 3.0% Expected long-term rate of return on plan assets N/A N/A N/A European defined benefit retirement plans: Discount rates 1.20% - 2.55% 1.25% - 2.95% 1.8% - 3.9% Rates of increase in compensation 2.75% - 3.0% 2.75% - 3.0% 2.8% - 3.0% Expected long-term rates of return on plan assets 2.0% – 4.75% 3.0% – 4.75% 3.0% – 5.25% Postretirement benefit plans: Discount rates 3.0% 3.3% 3.4% The following table presents the impact that a one-percentage-point increase and a one-percentage-point decrease in the expected long-term rate of return and discount rate would have on the 2017 pension expense, and the impact on our retirement obligation as of December 31, 2017 for a one-percentage-point change in the discount rate: Non-Qualified (In millions) Pension Plans Retiree Plans U.K. Plan Periodic pension expense One-percentage-point increase: Expected long-term rate of return $ N/A $ N/A $ (1.7 ) Discount rate $ (0.1 ) — 0.5 One-percentage-point decrease: Expected long-term rate of return $ N/A $ N/A $ 1.7 Discount rate $ 0.2 $ — $ 0.2 Retirement obligation One-percentage-point increase in discount rate $ (1.1 ) $ (0.2 ) $ (22.3 ) One-percentage-point decrease in discount rate $ 1.2 $ 0.3 $ 28.5 The annual rate of increase in the per capita cost of covered health care benefits is assumed to be 7.0% for medical and 5.0% for dental and vision for 2017. The medical rates are assumed to gradually decline to 4.75% by 2028, whereas dental and vision rates are assumed to remain constant at 5.0%. A one-percentage-point increase and a one-percentage-point decrease in the assumed health care cost trend would have an insignificant impact on the total of service and interest cost components, and would have an immaterial impact on the postretirement benefit obligation for both 2017 and 2016.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 8 — Income Taxes Income before income taxes and the provision for income taxes, for the three years ended December 31, 2017, were as follows: (In millions) 2017 2016 2015 Income before income taxes: U.S. $ 155.5 $ 149.1 $ 164.3 International 167.7 188.5 153.9 Total income before income taxes $ 323.2 $ 337.6 $ 318.2 Provision for income taxes: Current: U.S. $ 18.9 $ (9.5 ) $ (0.3 ) International 20.3 37.1 30.1 Current provision for income taxes 39.2 27.6 29.8 Deferred: U.S. (1.9 ) 54.3 48.6 International 5.2 8.4 4.6 Deferred provision for income taxes 3.3 62.7 53.2 Total provision for income taxes $ 42.5 $ 90.3 $ 83.0 A reconciliation of the provision for income taxes at the U.S. federal statutory income tax rate of 35% to the effective income tax rate, for the three years ended December 31, 2017, is as follows: (In millions) 2017 2016 2015 Provision for taxes at U.S. federal statutory rate $ 113.1 $ 118.2 $ 111.4 State and local taxes, net of federal benefit 0.2 3.1 2.5 Foreign effective rate differential (14.4 ) (26.8 ) (22.6 ) Tax credits (16.0 ) (10.1 ) (3.1 ) Change in Valuation Allowance (9.1 ) 10.4 3.1 Remeasurement of deferred taxes (67.8 ) — — Transition Tax on undistributed foreign earnings 45.7 — — Excess Tax Benefits of Stock Based Compensation (7.6 ) (2.8 ) — Other 4.9 4.9 3.3 Release of reserves for uncertain tax positions (6.5 ) (6.6 ) (11.6 ) Total provision for income taxes $ 42.5 $ 90.3 $ 83.0 The Tax Cuts and Jobs Act (the “Act”) was enacted on December 22, 2017. The Act reduces the US federal corporate tax rate from 35% to 21% in 2018, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and creates new taxes on certain foreign-sourced earnings. At December 31, 2017, we have not fully completed our accounting for the tax effects of enactment of the Act; however, in certain cases, as described below, we have made a reasonable estimate of the effects on our existing deferred tax balances and the one-time transition tax based on the latest Act guidance that currently exists. For the items for which we were able to determine a reasonable estimate, we recognized a provisional tax benefit of $22.1 million, which is included as a component of income tax expense from continuing operations. These adjustments of the Tax Cuts and Jobs Act reduced our effective tax rate for 2017 by 6.8%. Deferred tax assets and liabilities: We remeasured all U.S. deferred tax assets and liabilities based on the rates at which they are expected to reverse in the future, which is generally 21%. However, we are still analyzing certain aspects of the Act and refining our calculations, which could potentially affect the measurement of these balances or potentially give rise to new deferred tax amounts. The provisional amount recorded related to the remeasurement of our deferred tax balance resulted in a tax benefit of $67.8 million. The one-time transition tax is based on our total post-1986 earnings and profits (E&P) which was not previously subject to US income taxes. We recorded a provisional amount for our one-time transition tax liability for all of our controlled foreign corporations, resulting in an increase in income tax expense of $45.7 million, net of foreign tax credits. The tax due on unremitted earnings will be paid over 8 years, as permitted by the Act. The transition tax is based in part on the total post 1986 foreign E&P and the The transition tax , which was not as we or withholding , including those nor have taxes been provided for Additionally, due to withholding , basis computations, and other considerations, it to estimate any taxes to be provided on outside basis differences ultimate tax impact related the Act may differ, possibly materially, due to further refinement of our calculations, changes in interpretation and assumptions, or issuance of Deferred Income Taxes Deferred income taxes result from tax attributes including foreign tax credits, net operating loss carryforwards and temporary differences between the recognition of items for income tax purposes and financial reporting purposes. Principal components of deferred income taxes as of December 31, 2017 and 2016 are: (In millions) 2017 2016 Assets Net operating loss carryforwards $ 65.1 $ 58.9 Unfunded pension liability and other postretirement obligations 0.5 5.6 Tax credit carryforwards 10.8 13.0 Stock based compensation 7.1 16.2 Other comprehensive income 0.2 4.6 Reserves and other 13.5 20.8 Subtotal 97.2 119.1 Valuation allowance (54.9 ) (58.9 ) Total assets $ 42.3 $ 60.2 Liabilities Accelerated depreciation (144.1 ) (160.6 ) Accelerated amortization (11.3 ) (12.9 ) Other (1.3 ) (0.4 ) Total liabilities $ (156.7 ) $ (173.9 ) Net deferred tax liabilities $ (114.4 ) $ (113.7 ) Deferred tax assets and deferred tax liabilities as presented in the consolidated balance sheets as of December 31, 2017 and 2016 are as follows and are recorded in prepaid expenses and other current assets, deferred tax assets, other accrued liabilities and other non-current liabilities in the consolidated balance sheets: (In millions) 2017 2016 Long-term deferred tax assets, net 14.3 8.9 Long-term deferred tax liability, net (128.7 ) (122.6 ) Net deferred tax liabilities $ (114.4 ) $ (113.7 ) The deferred tax assets for the respective periods were assessed for recoverability and, where applicable, a valuation allowance was recorded to reduce the total deferred tax asset to an amount that will, more likely than not, be realized in the future. The valuation allowance as of December 31, 2017 and 2016 relates primarily to net operating loss carryforwards of our foreign subsidiaries for which we have determined, based upon historical results and projected future book and taxable income levels, that a valuation allowance should continue to be maintained. The net change in the total valuation allowance for the years ended December 31, 2017 and 2016 was a decrease of $4.0 million and an increase of $1.1 million, respectively. Although realization is not assured, we have concluded that it is more-likely-than-not that the deferred tax assets, for which a valuation allowance was determined to be unnecessary, will be realized in the ordinary course of operations based on the available positive and negative evidence, including scheduling of deferred tax liabilities and projected income from operating activities. The amount of the net deferred tax assets considered realizable, however, could be reduced in the near term if actual future income or income tax rates are lower than estimated, or if there are differences in the timing or amount of future reversals of existing taxable or deductible temporary differences. Net Operating Loss & Tax Credit Carryforwards At December 31, 2017, we had tax credit carryforwards for U.S. tax purposes of $10.8 million available to offset future income taxes. These credits will begin to expire if not utilized in 2018. We also had net operating loss carryforwards for U.S. state and foreign income tax purposes of $25.6 million and $242.0 million, respectively, for which there were foreign valuation allowances of $202.9 million as of December 31, 2017. Our foreign net operating losses can be carried forward without limitation in Belgium, Luxembourg, Spain and the U.K. The carryforward period in China is limited to 5 years. We have a full valuation allowance against certain foreign net operating losses for which the Company believes it is not more likely than not that the net operating losses will be utilized. Uncertain Tax Positions Our unrecognized tax benefits at December 31, 2017, relate to various Foreign and U.S. jurisdictions. The following table summarizes the activity related to our unrecognized tax benefits. (In millions) 2017 2016 2015 Balance as of January 1, $ 16.7 $ 25.3 $ 43.1 Additions based on tax positions related to the current year 5.3 7.3 1.7 (Reductions) additions for tax positions of prior years (6.1 ) (11.1 ) (16.6 ) Expiration of the statute of limitations for the assessment of taxes (4.8 ) (4.2 ) (0.6 ) Other, including currency translation 1.2 (0.6 ) (2.3 ) Balance as of December 31, $ 12.3 $ 16.7 $ 25.3 Included in the unrecognized tax benefits of $12.3 million at December 31, 2017 was $11.3 million of tax benefits that, if recognized, would impact our annual effective tax rate. In addition, we recognize interest accrued related to unrecognized tax benefits as a component of interest expense and penalties as a component of income tax expense in the consolidated statements of operations. The Company recognized $0.3 million, $1.1 million, $0.6 million of interest expense and penalties related to the above unrecognized tax benefits in 2017, 2016 and 2015, respectively. The Company had accrued interest of approximately $0.8 million and $2.1 million as of December 31, 2017 and 2016, respectively. During 2017, we reversed $1.8 million of interest related to unrecognized tax benefits. We are subject to taxation in the U.S. and various states and foreign jurisdictions. The U.S. tax returns have been audited through 2013. Foreign and U.S. state jurisdictions have statutes of limitations generally ranging from 3 to 5 years. Years that are still open to examination in our major jurisdictions include the U.S. (2014 onward), Austria (2016 onward), Belgium (2014 onward), France (2014 onward), Spain (2013 onward) and the U.K. (2014 onward). We are currently under examination in the U.S. and certain foreign jurisdictions. As of December 31, 2017, we had uncertain tax positions for which it is reasonably possible that amounts of unrecognized tax benefits could significantly change over the next year. These uncertain tax positions relate to our tax returns from 2004 onward, some of which are currently under examination by certain U.S. and European tax authorities. The Company believes it is reasonably possible that the total amount of unrecognized tax benefits disclosed as of December 31, 2017 may decrease approximately $2 to $3 million in the fiscal year ending December 31, 2018. Such possible decrease primarily relates to audit settlements and the expiration of statutes of limitation.

Capital Stock

Capital Stock	12 Months Ended
	Dec. 31, 2017
Stockholders Equity Note [Abstract]
Capital Stock	Note 9 — Capital Stock Common Stock Outstanding Common stock outstanding as of December 31, 2017, 2016 and 2015 was as follows: (Number of shares in millions) 2017 2016 2015 Common stock: Balance, beginning of year 106.7 106.0 104.8 Activity under stock plans 1.1 0.7 1.2 Balance, end of year 107.8 106.7 106.0 Treasury stock: Balance, beginning of year 15.3 12.5 9.3 Repurchased 2.9 2.8 3.2 Balance, end of year 18.2 15.3 12.5 Common stock outstanding 89.6 91.4 93.5 In June 2014, our Board authorized a plan to repurchase $150 million of our outstanding common stock (“2014 Repurchase Plan”). In October 2015, our Board authorized the repurchase of $250 million of the Company’s common stock. During February of 2017, the Board authorized the repurchase on an additional $300 million of the Company’s common stock of which $242.5 million is still available at December 31, 2017. During 2017, 2016 and 2015, the Company spent $150.3 million, $111.1 million, and $146.1 million to repurchase common stock under its repurchase programs. During 2017 the Company paid $42.6 million in dividends on its common stock. Dividends per share of common stock for 2017, 2016, and 2015, were $0.47, $0.44, and $0.40, respectively .

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	Note 10 — Stock-Based Compensation The following table details the stock-based compensation expense by type of award for the years ended December 31, 2017, 2016 and 2015: Year Ended December 31, (In millions, except per share data) 2017 2016 2015 Non-qualified stock options $ 4.0 $ 3.6 $ 3.3 Restricted stock, service based (“RSUs”) 6.4 5.8 6.4 Restricted stock, performance based (“PRSUs”) 6.7 6.3 7.9 Employee stock purchase plan 0.4 0.4 0.3 Stock-based compensation expense $ 17.5 $ 16.1 $ 17.9 Tax benefit from stock exercised and converted during the period $ 7.6 $ 2.8 $ 9.2 Non-Qualified Stock Options Non-qualified stock options (“NQOs”) have been granted to our employees and directors under our stock compensation plan. Options granted generally vest over three years and expire ten years from the date of grant. A summary of option activity under the plan for the three years ended December 31, 2017 is as follows: Weighted-Average Number of Weighted- Remaining Options Average Contractual Life (In millions) Exercise Price (in years) Outstanding at December 31, 2014 2.8 $ 19.12 4.95 Options granted 0.2 $ 43.96 Options exercised (0.7 ) $ 12.77 Outstanding at December 31, 2015 2.3 $ 23.75 5.39 Options granted 0.3 $ 41.71 Options exercised (0.3 ) $ 20.17 Outstanding at December 31, 2016 2.3 $ 26.08 5.20 Options granted 0.2 $ 50.50 Options exercised (0.8 ) $ 22.34 Outstanding at December 31, 2017 1.7 $ 31.18 5.19 Year Ended December 31, (In millions, except weighted average exercise price) 2017 2016 Aggregate intrinsic value of outstanding options $ 53.1 $ 57.2 Aggregate intrinsic value of exercisable options $ 45.8 $ 53.2 Total intrinsic value of options exercised $ 25.6 $ 6.7 Total number of options exercisable 1.3 1.8 Weighted average exercise price of options exercisable $ 25.27 $ 21.99 Total unrecognized compensation cost on nonvested options (a) $ 1.2 $ 1.1 (a) Unrecognized compensation cost relates to nonvested stock options and is expected to be recognized over the remaining vesting period ranging from one year to three years. Valuation Assumptions in Estimating Fair Value We estimated the fair value of stock options at the grant date using the Black-Scholes option pricing model with the following assumptions for the years ended December 31, 2017, 2016 and 2015: 2017 2016 2015 Risk-free interest rate 2.41 % 1.62 % 1.56 % Expected option life (in years) Executive 6.68 6.77 6.84 Expected option life (in years) Non-Executive 4.76 4.72 6.09 Dividend yield 0.9 % 1.0 % 1.0 % Volatility 34.74 % 38.41 % 35.59 % Weighted-average fair value per option granted $ 16.93 $ 14.65 $ 14.95 We determine the expected option life for each grant based on ten years of historical option activity for two separate groups of employees (executive and non-executive). The weighted-average expected life (“WAEL”) is derived from the average midpoint between the vesting and the contractual term and considers the effect of both the inclusion and exclusion of post-vesting cancellations during the ten-year period. Expected volatility is calculated based on a blend of both historic volatility of our common stock and implied volatility of our traded options. We weigh both volatility inputs equally and utilize the average as the volatility input for the Black-Scholes calculation. The risk-free interest rate for the expected term is based on the U.S. Treasury yield curve in effect at the time of grant and corresponding to the expected term. Restricted Stock Units — Service Based As of December 31, 2017, a total of 490,739 shares of service based restricted stock (“RSUs”) were outstanding, which vest based on years of service under the 2003 and 2013 incentive stock plans. RSUs are granted to key employees, executives and directors of the Company. The fair value of the RSU is based on the closing market price of the Company’s common stock on the date of grant and is amortized on a straight line basis over the requisite service period. The stock-based compensation expense recognized is based on an estimate of shares ultimately expected to vest, and therefore it has been reduced for estimated forfeitures. The total compensation expense related to awards granted to retirement-eligible employees is recognized on the grant date. The table presented below provides a summary of the Company’s RSU activity for the years ended December 31, 2017, 2016 and 2015: Weighted- Number of Average RSUs Grant Date (In millions) Fair Value Outstanding at December 31, 2014 0.5 $ 27.76 RSUs granted 0.1 $ 43.96 RSUs issued (0.1 ) $ 28.95 Outstanding at December 31, 2015 0.5 $ 31.73 RSUs granted 0.1 $ 42.05 RSUs issued (0.1 ) $ 37.01 Outstanding at December 31, 2016 0.5 $ 33.72 RSUs granted 0.1 $ 50.97 RSUs issued (0.1 ) $ 38.17 Outstanding at December 31, 2017 0.5 $ 36.75 As of December 31, 2017, there was total unrecognized compensation cost related to nonvested RSUs of $7.2 million, which is to be recognized over the remaining vesting period ranging from one year to three years. Restricted Stock Units — Performance Based As of December 31, 2017, a total of 367,760 shares of performance based restricted stock (“PRSUs”) were outstanding under the 2003 and 2013 incentive stock plans. The total amount of PRSUs that will ultimately vest is based on the achievement of various financial performance targets set forth by the Company’s Compensation Committee on the date of grant. PRSUs are based on a three-year performance period. The stock based compensation expense related to awards granted to retirement-eligible employees is expensed on the grant date and is trued up as projections change. The fair value of the PRSU is based on the closing market price of the Company’s common stock on the date of grant and is amortized straight-line over the total three- year period. A change in the performance measure expected to be achieved is recorded as an adjustment in the period in which the change occurs. The table presented below provides a summary, of the Company’s PRSU activity, at original grant amounts, for the years ended December 31, 2017, 2016 and 2015: Weighted- Number of Average PRSUs Grant Date (In millions) Fair Value Outstanding at December 31, 2014 0.4 $ 31.68 PRSUs granted 0.1 $ 43.96 PRSUs additional performance shares 0.1 $ 42.23 PRSUs issued (0.2 ) $ 24.95 Outstanding at December 31, 2015 0.4 $ 36.59 PRSUs granted 0.2 $ 43.96 PRSUs additional performance shares 0.1 $ 28.09 PRSUs issued (0.3 ) $ 28.15 Outstanding at December 31, 2016 0.4 $ 42.66 PRSUs granted 0.2 $ 50.50 PRSUs issued (0.2 ) $ 42.57 Outstanding at December 31, 2017 0.4 $ 45.35 As of December 31, 2017, there was total unrecognized compensation cost related to nonvested PRSUs of $2.0 million, which is to be recognized over the remaining vesting period ranging from one year to three years. The final amount of compensation cost to be recognized is dependent upon our financial performance. Stock-Based Compensation Cash Activity During 2017, cash received from stock option exercises and from employee stock purchases was $16.2 million. We used $5.7 million in cash related to the shares withheld to satisfy employee tax obligations for RSUs and PRSUs converted during the year ended December 31, 2017. We classify the cash flows resulting from these tax benefits as financing cash flows. We either issue new shares of our common stock or utilize treasury shares upon the exercise of stock options or the conversion of stock units. Shares Authorized for Grant As of December 31, 2017, an aggregate of 1.6 million shares were authorized for future grant under our stock plan, which covers stock options, RSUs, PRSUs and at the discretion of Hexcel, could result in the issuance of other types of stock-based awards. Employee Stock Purchase Plan (“ESPP”) The Company offers an ESPP, which allows for eligible employees to contribute up to 10% of their base earnings, to a maximum of $25,000 in a calendar year, toward the quarterly purchase of our common stock at a purchase price equal to 85% of the fair market value of the common stock. There were 52,824 and 47,952 ESPP shares purchased in 2017 and 2016, respectively.

Net Income Per Common Share

Net Income Per Common Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Net Income Per Common Share	Note 11 — Net Income Per Common Share Computations of basic and diluted net income per common share for the years ended December 31, 2017, 2016 and 2015, are as follows: (In millions, except per share data) 2017 2016 2015 Basic net income per common share: Net income $ 284.0 $ 249.8 $ 237.2 Weighted average common shares outstanding 90.6 92.8 95.8 Basic net income per common share $ 3.13 $ 2.69 $ 2.48 Diluted net income per common share: Weighted average common shares outstanding — Basic 90.6 92.8 95.8 Plus incremental shares from assumed conversions: Restricted stock units 0.4 0.4 0.5 Stock options 0.9 1.0 0.9 Weighted average common shares outstanding — Dilutive 91.9 94.2 97.2 Dilutive net income per common share $ 3.09 $ 2.65 $ 2.44 Anti-dilutive shares outstanding, excluded from computation 0.2 0.4 —

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 12 — Derivative Financial Instruments Interest Rate Swap Agreements As of December 31, 2017, the Company had approximately $50 million of interest rate swaps that swap floating rate obligations for fixed rate obligations at an average of 1.09% against LIBOR in U.S. dollars. The swap matures in September 2019. The swap was accounted for as a cash flow hedge of our floating rate bank loan. To ensure the swap was highly effective, all of the principal terms of the swap matched the term of the bank loan. The fair value of the interest rate swap was an asset of $0.8 million and $0.7 million at December 31, 2017 and December 31, 2016, respectively. At December 31 2017, we had two interest swaps related to European debt obligations which had a combined notional value of approximately €56.4 million. These derivatives swapped floating rate obligations for fixed rates at a weighted average rate of 0.5% against EURIBOR in Euros. The swaps amortize through the final maturities of the obligations on June 30, 2023 and June 30, 2024, in annual installments. The derivatives are accounted for as cash flow hedges of the floating rate French term loans. To ensure the swaps are highly effective, all of the principal terms of the swap matched the terms of the bank loans. The fair value of the interest rate swaps was a liability of $0.4 million and $0.1 million at December 31, 2017 and December 31, 2016, respectively. The Company had treasury lock agreements to protect against unfavorable movements in the benchmark treasury rate related to the issuance . These hedges were designated as cash flow hedges for hedge accounting purposes thus any change in fair value was recorded as a component of other comprehensive income. As part of the issuance of our senior notes, we net settled these derivatives for $10 million in cash. As a result of settling these derivatives the previously deferred gains recorded in other comprehensive income will be released to interest expense over the life of the senior notes. The effect of these settled treasury locks will reduce the effective interest rate on the senior notes by approximately 0.25% Foreign Currency Forward Exchange Contracts A number of our European subsidiaries are exposed to the impact of exchange rate volatility between the U.S. dollar and the subsidiaries’ functional currencies, being either the Euro or the British pound sterling. We entered into contracts to exchange U.S. dollars for Euros and British pound sterling through June 2020. The aggregate notional amount of these contracts was $285.4 million at December 31, 2017 and $423.8 million at December 31, 2016. The purpose of these contracts is to hedge a portion of the forecasted transactions of European subsidiaries under long-term sales contracts with certain customers. These contracts are expected to provide us with a more balanced matching of future cash receipts and expenditures by currency, thereby reducing our exposure to fluctuations in currency exchange rates. The effective portion of the hedges was a gain of $34.6 million and losses of $32.2 million and $26.7 million, for the years ended December 31, 2017, 2016 and 2015, respectively, and are recorded in other comprehensive income. At December 31, 2017, $14.7 million of the carrying amount of these contracts was classified in other assets and $2.8 million in other liabilities on the consolidated balance sheets and $33.9 million classified in other liabilities at December 31, 2016. During the years ended December 31, 2017, 2016 and 2015, we recognized net losses of $11.3 million, $19.4 million and $17.8 million, respectively, recorded in sales. For the three years ended December 31, 2017, 2016 and 2015, hedge ineffectiveness was immaterial. In addition, we enter into foreign exchange forward contracts which are not designated as hedges. These are used to provide an offset to transactional gains or losses arising from the remeasurement of non-functional monetary assets and liabilities such as accounts receivable. The change in the fair value of the derivatives is recorded in the statement of operations. There are no credit contingency features in these derivatives. During the years ended December 31, 2017, 2016 and 2015, we recognized net foreign exchange gains of $17.1 million and losses of $0.9 million, and $14.9 million, respectively, in the consolidated statements of operations. The carrying amount of the contracts for asset and liability derivatives not designated as hedging instruments was $1.3 million classified in other assets and $0.1 million in other liabilities on our consolidated balance sheets. The activity, net of tax, in accumulated other comprehensive loss related to foreign currency forward exchange contracts for the years ended December 31, 2017, 2016 and 2015 was as follows: (In millions) 2017 2016 2015 Unrealized losses at beginning of period, net of tax $ (25.9 ) $ (15.0 ) $ (9.2 ) Losses reclassified to net sales 8.9 14.4 11.8 Increase (decrease) in fair value 25.6 (25.3 ) (17.6 ) Unrealized gains (losses) at end of period, net of taxes $ 8.6 $ (25.9 ) $ (15.0 ) Unrealized gains of $3.5 million recorded in accumulated other comprehensive loss, net of tax of $1.7 million, as of December 31, 2017 are expected to be reclassified into earnings over the next twelve months as the hedged sales are recorded. The impact of credit risk adjustments was immaterial for the three years.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 13 — Commitments and Contingencies We are involved in litigation, investigations and claims arising out of the normal conduct of our business, including those relating to commercial transactions, environmental, employment and health and safety matters. We estimate and accrue our liabilities resulting from such matters based on a variety of factors, including the stage of the proceeding; potential settlement value; assessments by internal and external counsel; and assessments by environmental engineers and consultants of potential environmental liabilities and remediation costs. Such estimates are not discounted to reflect the time value of money due to the uncertainty in estimating the timing of the expenditures, which may extend over several years. While it is impossible to ascertain the ultimate legal and financial liability with respect to certain contingent liabilities and claims, we believe, based upon our examination of currently available information, our experience to date, and advice from legal counsel, that the individual and aggregate liabilities resulting from the ultimate resolution of these contingent matters, after taking into consideration our existing insurance coverage and amounts already provided for, will not have a material adverse impact on our consolidated results of operations, financial position or cash flows. Environmental Matters We are subject to various U.S. and international federal, state and local environmental, and health and safety laws and regulations. We are also subject to liabilities arising under the Federal Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA” or “Superfund”), the Clean Air Act, the Clean Water Act, the Resource Conservation and Recovery Act, and similar state and international laws and regulations that impose responsibility for the control, remediation and abatement of air, water and soil pollutants and the manufacturing, storage, handling and disposal of hazardous substances and waste. We have been named as a potentially responsible party (“PRP”) with respect to several hazardous waste disposal sites that we do not own or possess, which are included on, or proposed to be included on, the Superfund National Priority List of the U.S. Environmental Protection Agency (“EPA”) or on equivalent lists of various state governments. Because CERCLA allows for joint and several liability in certain circumstances, we could be responsible for all remediation costs at such sites, even if we are one of many PRPs. We believe, based on the amount and nature of our waste, and the number of other financially viable PRPs, that our liability in connection with such matters will not be material. Lower Passaic River Study Area Hexcel and a group of approximately 51 other PRPs comprise the Lower Passaic Cooperating Parties Group (the “CPG”). Hexcel and the CPG are subject to a May 2007 Administrative Order on Consent (“AOC”) to perform a Remedial Investigation/Feasibility Study (“RI/FS”) of environmental conditions in the Lower Passaic River watershed. We were included in the CPG based on our operations at our former manufacturing site in Lodi, New Jersey. In March 2016, the EPA issued a Record of Decision (“ROD”) setting forth the EPA’s selected remedy for the lower eight miles of the river in addition to a “no action” option. The ROD calls for capping and dredging of the lower eight miles of the Passaic River, with the placement of an engineered cap over the entire eight miles, at an expected cost ranging from $0.97 billion to $2.07 billion, according to the EPA. Because the EPA has not yet selected a remedy for the upper nine miles of the Lower Passaic River, this estimate range does not include any costs related to a future remedy for the upper portion of the river. Now that it has issued the final ROD, the EPA will seek to hold some combination of the PRPs liable to perform the work selected through the ROD. At this point, we have not yet determined our allocable share of performing the selected remedy. However, based on a review of the Company’s position, and as no point within the range is a more probable outcome than any other point, the Company has determined that its accrual is sufficient at this time. The total accrued liability related to this matter was $2.0 million at December 31, 2017 and $2.1 million at December 31, 2016. Despite the issuance of the final ROD, there continue to be many uncertainties associated with the selected remedy and the Company’s allocable share of the remediation. Given those uncertainties, the amounts accrued may not be indicative of the amounts for which the Company is ultimately responsible and will be refined as events in the remediation process develop. Omega Chemical Corporation Superfund Site, Whittier, California We are a PRP at a former chemical waste site in Whittier, California. The PRPs at Omega have established a PRP Group, the “Omega PRP Group,” and are currently investigating and remediating soil and groundwater at the site pursuant to a Consent Decree with the EPA. The Omega PRP Group has attributed approximately 1.07% of the waste tonnage sent to the site to Hexcel. In addition to the Omega site specifically, the EPA is investigating the scope of regional groundwater contamination in the vicinity of the Omega site and issued a Record of Decision; the Omega PRP Group members have been noticed by the EPA as PRPs who will be required to be involved in the remediation of the regional groundwater contamination in that vicinity as well. As a member of the Omega PRP Group, Hexcel will incur costs associated with the investigation and remediation of the Omega site and the regional groundwater remedy, although our ultimate liability, if any, in connection with this matter cannot be determined at this time. The total accrued liability relating to potential liability for both the Omega site and regional groundwater remedies was $0.6 million at December 31, 2017 and December 31, 2016. Environmental remediation reserve activity for the three years ended December 31, 2017 was as follows: For the year ended December 31, (In millions) 2017 2016 2015 Beginning remediation accrual balance $ 3.2 $ 2.9 $ 5.0 Current period expenses 0.1 1.2 0.5 Cash expenditures (0.5 ) (0.9 ) (2.6 ) Ending remediation accrual balance $ 2.8 $ 3.2 $ 2.9 Environmental Summary Our estimate of liability as a PRP and our remaining costs associated with our responsibility to remediate the Lower Passaic River, New Jersey and other sites are accrued in the consolidated balance sheets. As of December 31, 2017 and 2016, our aggregate environmental related accruals were $2.8 million and $3.2 million, respectively. As of December 31, 2017 and 2016, $0.9 million and $1.4 million, respectively, were included in current other accrued liabilities with the remainder included in other non-current liabilities. As related to certain environmental matters, the accruals were estimated at the low end of a range of possible outcomes since no amount within the range is a better estimate than any other amount. If we had accrued, for those sites where we are able to estimate our liability, at the high end of the range of possible outcomes, our accrual would have been $16 million higher at December 31, 2017 and 2016. These accruals can change significantly from period to period due to such factors as additional information on the nature or extent of contamination, the methods of remediation required, changes in the apportionment of costs among responsible parties and other actions by governmental agencies or private parties, or the impact, if any, of being named in a new matter. Environmental remediation spending charged directly to our reserve balance was $0.5 million and $0.8 million for the years ended December 31, 2017 and 2016, respectively. In addition, our operating costs relating to environmental compliance charged directly to expense were $9.9 million and $10.1 million for the years ended December 31, 2017 and 2016. Product Warranty Warranty expense for the years ended December 31, 2017, 2016 and 2015, and accrued warranty cost, included in “other accrued liabilities” in the consolidated balance sheets were as follows: Product (In millions) Warranties Balance as of December 31, 2014 $ 11.3 Warranty expense 3.5 Deductions and other (8.7 ) Balance as of December 31, 2015 $ 6.1 Warranty expense 5.1 Deductions and other (5.7 ) Balance as of December 31, 2016 $ 5.5 Warranty expense 3.0 Deductions and other (4.9 ) Balance as of December 31, 2017 $ 3.6

Supplemental Cash Flow

Supplemental Cash Flow	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow	Note 14 — Supplemental Cash Flow Supplemental cash flow information, for the years ended December 31, 2017, 2016 and 2015, consisted of the following: (In millions) 2017 2016 2015 Cash paid for: Interest $ 22.6 $ 23.2 $ 9.8 Taxes $ 22.4 $ 31.7 $ 40.8

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Accumulated Other Comprehensive Loss	Note 15 — Accumulated Other Comprehensive Loss Comprehensive income represents net income and other gains and losses affecting stockholders’ equity that are not reflected in the consolidated statements of operations. The components of accumulated other comprehensive loss as of December 31, 2017 and 2016 were as follows: (In millions) Unrecognized Net Defined Change in Fair Value of Derivatives Foreign Currency Translation Total Balance at December 31, 2016 $ (14.6 ) $ (18.7 ) $ (141.1 ) $ (174.4 ) Other comprehensive income (loss) before reclassifications (2.9 ) 25.0 99.8 121.9 Amounts reclassified from accumulated other comprehensive loss (1.0 ) 8.5 — 7.5 Other comprehensive income (loss) (3.9 ) 33.5 99.8 129.4 Balance at December 31, 2017 $ (18.5 ) $ 14.8 $ (41.3 ) $ (45.0 ) The amounts reclassified to earnings from the unrecognized net defined benefit plan costs component of accumulated other comprehensive loss for the year ended December 31, 2017 were net gains of $1.2 million less taxes of $0.2 million primarily due to the amortization of net actuarial losses. The amounts reclassified to earnings from the change in fair value of the derivatives component of accumulated other comprehensive loss for the year ended December 31, 2017 were net gains of $11.3 million less taxes of $2.3 million related to foreign currency forward exchange contracts and $0.8 million less taxes of $0.3 million related to interest swaps. The currency translation adjustments are not currently adjusted for income taxes as they relate to indefinite investments in non-U.S. subsidiaries.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment Information	Note 16 — The financial results for our segments are prepared using a management approach, which is consistent with the basis and manner in which we internally segregate financial information for the purpose of assisting in making internal operating decisions. We evaluate the performance of our segments based on operating income, and generally account for intersegment sales based on arm’s length prices. We report two segments, Composite Materials and Engineered Products. Corporate and certain other expenses are not allocated to the segments, except to the extent that the expense can be directly attributable to the segment. Corporate & Other is shown to reconcile to Hexcel’s consolidated results. In addition to the product line-based segmentation of our business, we also monitor sales into our principal end markets as a means to understanding demand for our products. Therefore, for each segment, we have also reported disaggregated sales by end market. The following table presents financial information on our segments as of December 31, 2017, 2016 and 2015, and for the years then ended. (In millions) Composite Materials Engineered Products Corporate & Other Total Third-Party Sales 2017 $ 1,597.1 $ 376.2 $ — $ 1,973.3 2016 1,610.0 394.3 — 2,004.3 2015 1,458.7 402.5 — 1,861.2 Intersegment sales 2017 $ 63.6 $ 0.4 $ (64.0 ) $ — 2016 67.6 0.1 (67.7 ) — 2015 70.4 8.5 (78.9 ) — Operating income (loss) 2017 $ 359.4 $ 48.7 $ (57.5 ) $ 350.6 2016 368.3 50.0 (58.2 ) 360.1 2015 336.2 55.8 (59.6 ) 332.4 Depreciation and amortization 2017 $ 96.8 $ 7.5 $ 0.2 $ 104.5 2016 86.0 7.2 0.1 93.3 2015 70.0 6.1 0.3 76.4 Equity in earnings from affiliated companies 2017 $ — $ 3.3 $ — $ 3.3 2016 — 2.5 — 2.5 2015 0.2 1.8 — 2.0 Segment assets 2017 $ 2,415.5 $ 279.1 $ 86.3 $ 2,780.9 2016 2,127.2 220.7 52.7 2,400.6 2015 1,892.0 239.4 56.0 2,187.4 Investments in affiliated companies 2017 $ — $ 26.5 $ 21.2 $ 47.7 2016 — 23.1 30.0 53.1 2015 10.1 20.3 — 30.4 Accrual basis additions to property, plant and equipment 2017 $ 270.3 $ 14.1 $ — $ 284.4 2016 305.2 14.9 0.1 320.2 2015 276.0 13.0 — 289.0 Geographic Data Net sales and long-lived assets, by geographic area, consisted of the following for the three years ended December 31, 2017, 2016 and 2015: Spain 2017 2016 2015 Net sales by Geography (a): United States $ 937.3 $ 957.8 $ 955.4 International France 335.7 335.2 320.6 Spain 187.0 219.7 217.8 Germany 206.0 169.5 83.2 United Kingdom 160.4 154.2 125.1 Austria 86.1 92.8 93.1 Other 60.8 75.1 66.0 Total international 1,036.0 1,046.5 905.8 Total consolidated net sales $ 1,973.3 $ 2,004.3 $ 1,861.2 Net Sales to External Customers (b): United States $ 806.6 $ 833.1 $ 850.1 International Germany 217.7 210.5 163.7 Spain 199.4 204.4 149.7 France 161.5 153.8 140.3 United Kingdom 80.1 95.5 84.2 Other 508.0 507.0 473.2 Total international 1,166.7 1,171.2 1,011.1 Total $ 1,973.3 $ 2,004.3 $ 1,861.2 Long-lived assets (c): United States $ 1,304.4 $ 1,213.8 $ 1,109.9 International France 402.7 217.2 112.1 United Kingdom 151.6 130.8 133.4 Spain 61.7 56.2 59.8 Other 94.6 79.8 69.3 Total international 710.6 484.0 374.6 Total consolidated long-lived assets $ 2,015.0 $ 1,697.8 $ 1,484.5 (a) Net sales by geography based on the location in which the product sold was manufactured. (b) Net sales to external customers based on the location to which the product sold was delivered. (c) Long-lived assets primarily consist of property, plant and equipment, net and goodwill. Significant Customers and Suppliers Approximately 44%, 41% and 35% of our 2017, 2016 and 2015 net sales, respectively, were to Airbus and its subcontractors. Of the 44% of overall sales to Airbus and its subcontractors in 2017, 40 % related to Commercial Aerospace market applications and 4% related to Space & Defense market applications. Approximately 25%, 28% and 31% of our 2017, 2016 and 2015 net sales, respectively, were to Boeing and related subcontractors. Of the 25% of overall sales to Boeing and its subcontractors in 2017, 23% related to Commercial Aerospace market applications and 2% related to Space & Defense market applications. In the Composite Materials segment approximately 16%, 17% and 21% of sales for 2017, 2016 and 2015, respectively, were to Boeing and its subcontractors. Approximately 50%, 48% and 42 % of sales for 2017, 2016 and 2015, respectively were to Airbus and its subcontractors. In the Engineered Products segment approximately 64%, 69% and 71% of sales for 2017, 2016 and 2015, respectively were to Boeing and its subcontractors. A significant decline in business with Airbus or Boeing could materially impact our business, operating results, prospects and financial condition. Certain key raw materials we consume are available from relatively few sources, and in many cases the cost of product qualification makes it impractical to develop multiple sources of supply. The lack of availability of these materials could under certain circumstances materially impact our consolidated results of operations.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	Note 17 — Acquisitions During 2017, we completed two acquisitions, which were accounted for as business combinations in accordance with ASC 805, Business Combinations. We acquired all of the outstanding shares of Structil SA, (“Structil”), which further enhances our technology portfolio with new adhesives prepreg and putrusion technology. We also acquired the aerospace and defense business of Oxford Performance Materials (“OPM”), bringing thermoplastic, carbon fiber reinforced 3D printed parts to our product portfolio. In connection with the acquisitions, the Company paid $64.1 million in cash, and returned shares previously purchased approximately valued at $20.0 million. In addition, the Company recognized a $2.9 million liability for contingent consideration, which represents the present value of certain earn-out payment obligations tied to future results. These transactions combined resulted in the recognition of approximately $38 million of goodwill, and approximately $32 million of intangible assets, as well as certain assets and liabilities. W e also made an additional investment in Carbon Conversions Incorporated (“CCI”). CCI is a leader in carbon fiber recycling and repurposing. In 2016, we acquired an interest in Oxford Performance Materials (“OPM”) for $15 million. We issued an 8% convertible secured promissory note to Luminati Aerospace LLC (“Luminati”), in the amount of $10 million. Luminati is an aerospace technology company focusing on research, development, testing, and manufacturing of next generation solar-electric unmanned aerial vehicles, or UAVs. The note matures in 2023 and the principal and interest are convertible into Luminati stock. The note will convert upon Luminati achieving certain milestones or at Hexcel’s discretion. On January 5, 2016, we completed our acquisition of Formax UK Limited (“Formax”) by purchasing the remaining 50% at a price of $12 million, of which $9 million was Located in Leicester, U.K., Formax is a leading manufacturer of composite reinforcements, specializing in the production of lightweight carbon multi-axials and highly engineered glass fiber and aramid fiber fabrics. The total purchase price, net of cash acquired and including the 50% interest acquired in December 2014, was $22 million and the assumption of long-term debt of $8.2 million. The step acquisition was accounted for under the acquisition method of accounting with the Company treated as the were The goodwill recognized is attributable to expected revenue synergies generated by the integration of our products and technologies with those of Formax, costs synergies resulting from the consolidation or elimination of certain functions, and intangible assets that do not qualify for separate recognition, such as the assembled workforce of Formax.

Non-Operating Expense

Non-Operating Expense	12 Months Ended
	Dec. 31, 2017
Other Income And Expenses [Abstract]
Non-Operating Expense	Note 18 — Non-operating Expense In June 2016, the Company amended and extended our $700 million senior unsecured revolving credit facility that now matures in June 2021. As a result of this amendment, we accelerated certain unamortized costs of the credit facility being replaced incurring a pretax charge of $0.4 million.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 19 — Fair Value Measurements The fair values of our financial instruments are classified into one of the following categories: • Level 1: Quoted prices (unadjusted) in active markets that are accessible at the measurement date for identical assets or liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs. • Level 2: Observable inputs other than quoted prices in active markets, but corroborated by market data. • Level 3: Unobservable inputs are used when little or no market data is available. The fair value hierarchy gives the lowest priority to Level 3 inputs. In determining fair value, we utilize valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible as well as consider our own and counterparty credit risk. At December 31, 2017, we had one liability which utilized level 3 inputs. At 2016, we did not have any assets or liabilities that utilize Level 3 inputs. For derivative assets and liabilities that utilize Level 2 inputs, we prepare estimates of future cash flows of our derivatives, which are discounted to a net present value. The estimated cash flows and the discount factors used in the valuation model are based on observable inputs, and incorporate non-performance risk (the credit standing of the counterparty when the derivative is in a net asset position, and the credit standing of Hexcel when the derivative is in a net liability position). The fair value of these assets and liabilities was approximately $16.7 million and $3.3 million, and approximately $12.0 million and $34.3 million respectively at December 31, 2017 and 2016. In addition, the fair value of these derivative contracts, which are subject to a master netting arrangement under certain circumstances, is presented on a gross basis in the consolidated balance sheet. Below is a summary of valuation techniques for all Level 2 financial assets and liabilities: • Interest rate swap — valued using LIBOR yield curves at the reporting date. The fair value of assets and liabilities was $0.8 million and $0.4 million at December 31, 2017. • Foreign exchange derivative assets and liabilities — valued using quoted forward foreign exchange prices at the reporting date. The fair value of assets and liabilities at December 31, 2017 was $16.0 million and $2.9 million, respectively. Counterparties to the above contracts are highly rated financial institutions, none of which experienced any significant downgrades in 2017 that would reduce the receivable amount owed, if any, to the Company. Liabilities classified as Level 3- during the year we recorded a liability related to our OPM acquisition for $2.9 million, which represented contingent consideration. This amount was estimated based on certain contractual stipulations which requires us to make payments to the seller in the future based upon the achievement of certain results. We used our current forecasted results of the acquired operations and discounted these future amounts using an internally derived discount rate. Future amounts payable may differ from this estimate by the difference between the actual and forecasted results. There has been no activity or changes to the initial amount recorded.

Quarterly Financial and Market

Quarterly Financial and Market Data (Unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial and Market Data (Unaudited)	Note 20 - Quarterly Financial and Market Data (Unaudited) Quarterly financial and market data for the years ended December 31, 2017 and 2016 were: First Second Third Fourth (In millions, except per share data) Quarter Quarter Quarter Quarter 2017 Net sales $ 478.8 $ 491.3 $ 491.5 $ 511.7 Gross margin 134.1 139.9 135.6 142.2 Operating income 78.6 89.7 89.1 93.2 Net income 64.6 61.6 69.7 88.1 Net income per common share: Basic $ 0.71 $ 0.68 $ 0.77 $ 0.97 Diluted $ 0.70 $ 0.67 $ 0.76 $ 0.96 Market price: High $ 55.91 $ 54.93 $ 58.24 $ 63.93 Low $ 49.77 $ 49.20 $ 50.50 $ 57.43 2016 Net sales $ 497.7 $ 522.6 $ 500.5 $ 483.5 Gross margin 143.0 150.3 135.7 135.6 Operating income 83.9 100.1 89.1 87.0 Net income 56.0 66.1 68.2 59.5 Net income per common share: Basic $ 0.60 $ 0.71 $ 0.74 $ 0.65 Diluted $ 0.59 $ 0.70 $ 0.72 $ 0.64 Market price: High $ 45.40 $ 46.26 $ 45.68 $ 54.97 Low $ 38.38 $ 39.15 $ 40.82 $ 42.04

Schedule II Valuation and Quali

Schedule II Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2017
Valuation And Qualifying Accounts [Abstract]
Schedule II Valuation and Qualifying Accounts	Hexcel Corporation and Subsidiaries Valuation and Qualifying Accounts (In millions) Balance at beginning of year Charged to expense/(recovery) Deductions and other Balance at end of year Year ended December 31, 2017 Allowance for doubtful accounts $ 0.4 $ 1.5 $ (1.6 ) $ 0.3 Valuation allowance for deferred tax assets 58.9 (10.6 ) 6.6 54.9 Year ended December 31, 2016 Allowance for doubtful accounts $ 0.3 $ 0.1 $ — $ 0.4 Valuation allowance for deferred tax assets 57.8 9.3 (8.2 ) 58.9 Year ended December 31, 2015 Allowance for doubtful accounts $ 0.4 $ — $ (0.1 ) $ 0.3 Valuation allowance for deferred tax assets 60.5 3.5 (6.2 ) 57.8

Significant Accounting Polici29

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of Hexcel Corporation and its subsidiaries after elimination of all intercompany accounts, transactions and profits. At December 31, 2017, we had a 50% equity ownership investment in the joint venture described above, which we accounted for using the equity method of accounting.
Use of Estimates	Use of Estimates Preparation of the accompanying consolidated financial statements and related disclosures in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash on hand and all highly liquid investments with an original maturity of three months or less when purchased. Our cash equivalents are held in prime money market investments with strong sponsor organizations which are monitored on a continuous basis.
Inventories	Inventories Inventories are stated at the lower of cost or net realizable value, with cost determined using the average cost methods. Inventory is reported at its estimated net realizable value based upon our historical experience with inventory becoming obsolete due to age, changes in technology and other factors.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment, including capitalized interest applicable to major project expenditures, is recorded at cost. Asset and accumulated depreciation accounts are eliminated for dispositions, with resulting gains or losses reflected in earnings. Depreciation of plant and equipment is provided using the straight-line method over the estimated useful lives of the various assets. The estimated useful lives range from 10 to 40 years for buildings and improvements and from 3 to 25 years for machinery and equipment. Repairs and maintenance are expensed as incurred, while major replacements and betterments are capitalized and depreciated over the remaining useful life of the related asset.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price over the fair value of the identifiable net assets of an acquired business. Goodwill is tested for impairment at the reporting unit level annually, or when events or changes in circumstances indicate that goodwill might be impaired. The Company’s annual test for goodwill impairment was performed in the fourth quarter of 2017. The Company performed a qualitative assessment (“Step Zero”) and determined that it was more likely than not that the fair values of our reporting units were not less than their carrying values and it was not necessary to perform a quantitative (“Step 1”) goodwill impairment test. We amortize the cost of other intangibles over their estimated useful lives unless such lives are deemed indefinite. We have indefinite lived intangible assets which are not amortized but are tested annually for impairment during the fourth quarter of each year, or when events or changes in circumstances indicate the potential for impairment. If the carrying amount of the indefinite lived intangible exceeds the fair value, it is written down to its fair value, which is calculated using a discounted cash flow model (“DCF”).
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company reviews long-lived assets, including property, plant and equipment and definite-lived intangible assets, for impairment whenever changes in circumstances or events may indicate that the carrying amounts are not recoverable. These indicators include, but are not limited to: a significant decrease in the market price of a long-lived asset, a significant change in the extent or manner in which a long-lived asset is used or its physical condition, a significant adverse change in legal factors or business climate that could affect the value of a long-lived asset, an accumulation of costs significantly in excess of the amount expected for the acquisition or construction of a long-lived asset, a current period operating or cash flow loss combined with a history of losses associated with a long-lived asset and a current expectation that, more likely than not, a long-lived asset will be sold or otherwise disposed of significantly before the end of its previously estimated life.
Software Development Costs	Software Development Costs Costs incurred to develop software for internal-use are accounted for under ASC 350-40, “Internal-Use Software.”
Debt Financing Costs	Debt Financing Costs Debt financing costs are deferred and amortized to interest expense over the life of the related debt. We capitalize financing fees related to our revolving credit facility and record them as a non-current asset in our consolidated balance sheets. Financing fees related to our bonds and notes are capitalized and recorded as a non-current liability (contra liability) in our consolidated balance sheets. At December 31, 2017 and 2016, deferred financing costs, recorded as a non-current asset were $3.1 million and $4.0 million, respectively, and net deferred financing costs recorded as non-current liability were $5.5 million, and $2.5 million, respectively.
Share-Based Compensation	Share-Based Compensation The fair value of Restricted Stock Units (“RSUs”) is equal to the market price of our stock at date of grant and is amortized to expense ratably over the vesting period. Performance restricted stock units (“PRSUs”) are a form of RSUs in which the number of shares ultimately received depends on the extent to which we achieve a specified performance target. The fair value of the PRSU is based on the closing market price of the Company’s common stock on the date of grant and is amortized straight-line over the total vesting period. A change in the performance measure expected to be achieved is recorded as an adjustment in the period in which the change occurs. We use the Black-Scholes model to calculate the fair value for all stock option grants, based on the inputs relevant on the date granted, such as the market value of our shares, prevailing risk-free interest rate, etc. The value of the portion of the award, after considering potential forfeitures, that is ultimately expected to vest is recognized as expense in our consolidated statements of operations on a straight-line basis over the requisite service periods. The value of RSU’s, PRSU’s and non-qualifying options awards for retirement eligible employees is expensed on the grant date as they are fully vested.
Currency Translation	Currency Translation The assets and liabilities of international subsidiaries are translated into U.S. dollars at year-end exchange rates, and revenues and expenses are translated at average exchange rates during the year. Cumulative currency translation adjustments are included in “accumulated other comprehensive loss” in the Stockholders’ Equity section of the consolidated balance sheets.
Revenue Recognition	Revenue Recognition Our revenue is predominately derived from sales of inventory, and is recognized when persuasive evidence of an arrangement exists, title and risk of loss passes to the customer, the sales price is fixed or determinable, and collectability is reasonably assured. However, from time to time we enter into contractual arrangements for which other specific revenue recognition guidance is applied. Revenues derived from design and installation services are recognized when the service is provided. Revenues derived from long-term construction-type contracts are accounted for using the percentage-of-completion method, and progress is measured on a cost-to-cost basis. If at any time expected costs exceed the value of the contract, the loss is recognized immediately. Shipping and handling fees and costs incurred in connection with products sold are recorded in cost of sales in our Consolidated Statements of Operations.
Product Warranty	Product Warranty We provide for an estimated amount of product warranty at the point a claim is probable and estimable. This estimated amount is provided by product and based on current facts, circumstances and historical warranty experience.
Research and Technology	Research and Technology Significant costs are incurred each year in connection with research and technology (“R&T”) programs that are expected to contribute to future earnings. Such costs are related to the development and, in certain instances, the qualification and certification of new and improved products and their uses. R&T costs are expensed as incurred.
Income Taxes	Income Taxes We provide for income taxes using the asset and liability approach .
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject us to significant concentrations of credit risk consist primarily of trade accounts receivable. Two customers and their related subcontractors accounted for approximately 69% our annual net sales in 2017, 69% in 2016, and 66% in 2015. Refer to Note 16 for further information on significant customers. We perform ongoing credit evaluations of our customers’ financial condition but generally do not require collateral or other security to support customer receivables. We establish an allowance for doubtful accounts based on factors surrounding the credit risk of specific customers, historical trends and other financial information. As of December 31, 2017 and 2016, the allowance for doubtful accounts was $0.3 million and $0.4 million, respectively. Bad debt expense was immaterial for all years presented.
Derivative Financial Instruments	Derivative Financial Instruments We use various financial instruments, including foreign currency forward exchange contracts and interest rate agreements, to manage our exposure to market fluctuations by generating cash flows that offset, in relation to their amount and timing, the cash flows of certain foreign currency denominated transactions or underlying debt instruments. We mark our foreign exchange forward contracts to fair value. When the derivatives qualify, we designate our foreign currency forward exchange contracts as cash flow hedges against forecasted foreign currency denominated transactions and report the effective portions of changes in fair value of the instruments in “accumulated other comprehensive loss” until the underlying hedged transactions affect income. We designate our interest rate agreements as fair value or cash flow hedges against specific debt instruments and recognize interest differentials as adjustments to interest expense as the differentials may occur; the fair value of the interest rate swaps is recorded in other assets or other long-term liabilities with a corresponding amount to “accumulated other comprehensive loss”. We do not use financial instruments for trading or speculative purposes. In accordance with accounting guidance, we recognize all derivatives as either assets or liabilities on our balance sheet and measure those instruments at fair value.
Self-insurance	Self-insurance We are self-insured up to specific levels for certain medical and health insurance and workers’ compensation plans. Accruals are established based on actuarial assumptions and historical claim experience, and include estimated amounts for incurred but not reported claims.
New Accounting Pronouncements	New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update No. 2014-09 (ASU 2014-09), “ Revenue from Contracts with Customers”. We have identified certain contracts under which we produce products with no alternative use and for which we have an enforceable right to payment during the production cycle. As a result, we will be required to record revenue for these contracts over time as opposed to at the time of shipment as we do today. We are adopting the provisions of this new standard using the modified retrospective method which allows companies to record a one time adjustment to opening retained earnings for the cumulative effect the standard will have on open contracts at the time of adoption. Upon adoption, we expect to accelerate approximately $40 million of revenue resulting in a less than $4 million adjustment to our 2018 opening retained earnings. In July 2015, the FASB issued Accounting Standards Update No.2015-11 (“ASU 2015-11”), Simplifying the Measurement of Inventory. In February 2016, the FASB issued Accounting Standards Update No. 2016-02 (ASU 2016-02), Leases In August of 2016, the FASB issued Accounting Standards Update No. 2016-15 (ASU 2016-15) "Classification of Certain Cash Receipts and Cash Payments” In January 2017, the FASB issued Accounting Standards Update No. 2017-04 (ASU 2017-04), Simplifying the test for Goodwill Impairment, In March 2017, the FASB issued Accounting Standards Update No. 2017-07 (ASU 2017-07), Compensation-Retirement Benefits, In August 2017, the FASB issued Accounting Standards Update No. 2017-12 (ASU 2017-12), Targeted Improvement to Accounting for Hedging Activities,

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Schedule of Inventories	December 31, (In millions) 2017 2016 Raw materials $ 126.7 $ 120.6 Work in progress 52.1 53.7 Finished goods 135.2 116.7 Total inventory $ 314.0 $ 291.0

Net Property, Plant and Equip31

Net Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Schedule of Property, Plant and Equipment	December 31, (In millions) 2017 2016 Land $ 96.7 $ 63.8 Buildings 624.2 523.2 Equipment 1,698.5 1,336.9 Construction in progress 322.0 454.4 Capital lease 2.5 0.1 Property, plant and equipment 2,743.9 2,378.4 Less accumulated depreciation (877.6 ) (752.8 ) Net property, plant and equipment $ 1,866.3 $ 1,625.6

Goodwill and Purchased Intang32

Goodwill and Purchased Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Gross Goodwill and Other Purchased Intangible Assets	Changes in the carrying amount of gross goodwill and other purchased intangibles for the years ended December 31, 2017 and 2016, by segment, are as follows (In millions) Composite Materials Engineered Products Total Balance as of December 31, 2015 $ 42.8 $ 16.1 $ 58.9 Amortization expense (0.3 ) — (0.3 ) Additions 18.1 — 18.1 Currency translation adjustments and other (4.5 ) — (4.5 ) Balance as of December 31, 2016 $ 56.1 $ 16.1 $ 72.2 Amortization expense (1.0 ) — (1.0 ) Additions 41.2 28.9 70.1 Currency translation adjustments and other 7.4 — 7.4 Balance as of December 31, 2017 $ 103.7 $ 45.0 $ 148.7

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of Debt and Capital Lease Obligations	December 31, December 31, (In millions) 2017 2016 Current portion of capital lease $ — $ 0.5 Current portion of Euro term loan 4.3 3.8 Current portion of debt 4.3 4.3 Senior unsecured credit facility — due 2021 50.0 365.0 Euro term loan 63.3 22.6 4.7% senior notes — due 2025 300.0 300.0 3.95% senior notes — due 2027 400.0 — Senior notes – original issue discount (2.3 ) (0.7 ) Senior notes – deferred financing costs (5.5 ) (2.5 ) Other debt 0.1 — Long-term debt 805.6 684.4 Total debt $ 809.9 $ 688.7

Leasing Arrangements (Tables)

Leasing Arrangements (Tables)	12 Months Ended
	Dec. 31, 2017
Leases [Abstract]
Schedule of Future Minimum Lease Payments	Scheduled future minimum lease payments as of December 31, 2017 were: (In millions) Payable during the years ending December 31: Operating Leases 2018 $ 10.6 2019 8.9 2020 6.9 2021 6.0 2022 1.8 Thereafter 2.4 Total minimum lease payments $ 36.6

Retirement and Other Postreti35

Retirement and Other Postretirement Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]
Schedule of Net Periodic Pension Expenses	Net periodic expense for our U.S. and European qualified and nonqualified defined benefit pension plans and our retirement savings plans for the three years ended December 31, 2017 is detailed in the table below. (In millions) 2017 2016 2015 Defined benefit retirement plans $ 0.6 $ 1.6 $ 2.7 Union sponsored multi-employer pension plan 1.9 2.1 2.2 Retirement savings plans-matching contributions 9.7 7.9 4.2 Retirement savings plans-profit sharing contributions 9.2 10.6 9.7 Net periodic expense $ 21.4 $ 22.2 $ 18.8
Schedule of Net Periodic Cost of Defined Benefit Retirement and Postretirement Plans	Net periodic cost of our defined benefit retirement and postretirement plans for the three years ended December 31, 2017, were: (In millions) U.S. Plans European Plans Defined Benefit Retirement Plans 2017 2016 2015 2017 2016 2015 Service cost $ 1.3 $ 1.2 $ 1.1 $ 1.0 $ 0.8 $ 0.8 Interest cost 0.6 0.6 0.5 4.6 5.4 6.1 Expected return on plan assets — — — (8.4 ) (7.6 ) (8.4 ) Net amortization 0.4 0.3 1.0 0.3 0.6 0.8 Termination benefits and settlement losses 0.7 0.2 0.8 0.1 0.1 — Net periodic pension cost (income) $ 3.0 $ 2.3 $ 3.4 $ (2.4 ) $ (0.7 ) $ (0.7 ) (In millions) U.S. Postretirement Plans 2017 2016 2015 Interest cost $ 0.1 $ 0.2 $ 0.2 Net amortization and deferral 0.1 (0.7 ) (0.6 ) Net periodic postretirement benefit loss (income) $ 0.2 $ (0.5 ) $ (0.4 )
Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income	Defined Benefit Retirement Plans U.S. Plans European Plans Postretirement Plans (In millions) 2017 2016 2017 2016 2017 2016 Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income Net loss (gain) $ 0.1 $ 0.1 $ 2.3 $ (5.0 ) $ — $ (0.9 ) Amortization of actuarial (losses) gains (0.8 ) (0.3 ) (0.4 ) (0.7 ) 1.1 0.7 Effect of foreign exchange — — 2.5 (4.0 ) — — Total recognized in other comprehensive income (pre-tax) $ (0.7 ) $ (0.2 ) $ 4.4 $ (9.7 ) $ 1.1 $ (0.2 )
Schedule of Benefit Obligation, Fair Value of Plan Assets, Funded Status and Amounts Recognized in the Consolidated Financial Statements	The benefit obligation, fair value of plan assets, funded status, and amounts recognized in the consolidated financial statements for our defined benefit retirement plans and postretirement plans, as of and for the years ended December 31, 2017 and 2016, were: Defined Benefit Retirement Plans U.S. Plans European Plans Postretirement Plans (In millions) 2017 2016 2017 2016 2017 2016 Change in benefit obligation: Benefit obligation - beginning of year $ 19.7 $ 17.7 $ 164.1 $ 162.8 $ 4.4 $ 5.3 Service cost 1.3 1.2 1.0 0.8 — — Interest cost 0.6 0.6 4.6 5.4 0.1 0.2 Plan participants’ contributions — — — — 0.2 0.1 Actuarial loss (gain) 0.1 0.2 6.8 27.7 — (1.0 ) Acquisitions — — 1.0 — — — Termination benefits and settlements 0.2 0.2 (0.6 ) (0.2 ) — — Benefits and expenses paid (0.5 ) (0.2 ) (4.6 ) (5.1 ) (0.6 ) (0.2 ) Currency translation adjustments — — 17.2 (27.3 ) — — Benefit obligation - end of year $ 21.4 $ 19.7 $ 189.5 $ 164.1 $ 4.1 $ 4.4 Change in plan assets: Fair value of plan assets - beginning of year $ — $ — $ 171.4 $ 160.4 $ — $ — Actual return on plan assets — — 12.9 40.3 — — Employer contributions 0.5 0.2 5.3 6.3 0.5 0.1 Plan participants’ contributions — — — — 0.2 0.1 Benefits and expenses paid (0.5 ) (0.2 ) (4.6 ) (5.1 ) (0.7 ) (0.2 ) Termination benefits and settlements — — (0.6 ) (0.2 ) — — Currency translation adjustments — — 17.4 (30.3 ) — — Fair value of plan assets - end of year $ — $ — $ 201.8 $ 171.4 $ — $ — Amounts recognized in Consolidated Balance Sheets: Noncurrent Assets $ — $ — $ 32.2 $ 23.9 $ — $ — $ 4.5 $ 1.1 $ 0.3 $ 0.4 $ 0.5 $ 0.5 Non-current liabilities 16.9 18.6 19.6 16.2 3.6 3.9 Total Liabilities $ 21.4 $ 19.7 $ 19.9 $ 16.6 $ 4.1 $ 4.4 Amounts recognized in Accumulated Other Comprehensive Loss: Actuarial net (loss) gain $ (3.1 ) $ (3.8 ) $ (26.6 ) $ (22.1 ) $ 3.3 $ 4.3 Prior service cost — — (0.1 ) (0.1 ) — — Total amounts recognized in accumulated other comprehensive loss $ (3.1 ) $ (3.8 ) $ (26.7 ) $ (22.2 ) $ 3.3 $ 4.3
Schedule of Expected Benefit Payments for the Plan	Benefit payments for the plans are expected to be as follows: European Postretirement (In millions) U.S. Plans Plans Plans 2018 $ 4.6 $ 4.7 $ 0.5 2019 1.0 4.9 0.5 2020 2.7 5.2 0.5 2021 2.9 7.2 0.5 2022 1.2 6.6 0.5 2023-2027 14.4 41.0 1.5 $ 26.8 $ 69.6 $ 4.0
Schedule of Pension Assets Measured at Fair Value	The following table presents pension assets measured at fair value at December 31, 2017 and 2016 utilizing the fair value hierarchy discussed in Note 19: Fair Value Measurements at (In millions) December 31, December 31, 2017 Description 2017 Level 1 Level 2 Level 3 Equity funds $ 56.3 $ — $ 56.3 $ — Diversified growth funds 48.0 — 48.0 — Insurance contracts 4.2 — — 4.2 Liability driven investments 38.7 — 38.7 — Index linked gilts 52.1 — 52.1 — Diversified investment funds 2.3 — — 2.3 Cash and cash equivalents 0.2 0.2 — — Total assets $ 201.8 $ 0.2 $ 195.1 $ 6.5 Fair Value Measurements at December 31, December 31, 2016 Description 2016 Level 1 Level 2 Level 3 Equity funds $ 53.8 $ — $ 53.8 $ — Diversified growth funds 41.2 — 41.2 — Index linked gilts 36.1 — 36.1 — Liability driven investments 34.4 — 34.4 — Insurance contracts 3.6 — — 3.6 Diversified investment funds 2.1 — — 2.1 Cash and cash equivalents 0.2 0.2 — — Total assets $ 171.4 $ 0.2 $ 165.5 $ 5.7 (In millions) Balance at Actual Purchases, Changes due Balance at January 1, return on sales and to exchange December 31, Reconciliation of Level 3 Assets 2017 plan assets settlements rates 2017 Diversified investment funds $ 2.1 $ 0.1 $ (0.2) $ 0.3 $ 2.3 Insurance contracts 3.6 0.2 (0.1) 0.5 4.2 Total level 3 assets $ 5.7 $ 0.3 $ (0.3) $ 0.8 $ 6.5 Balance at Actual Purchases, Changes due Balance at January 1, return on sales and to exchange December 31, Reconciliation of Level 3 Assets 2016 plan assets settlements rates 2016 Diversified investment funds $ 2.1 $ 0.1 $ — $ (0.1) $ 2.1 Insurance contracts 3.5 0.2 — (0.1) 3.6 Total level 3 assets $ 5.6 $ 0.3 $ — $ (0.2) $ 5.7
Schedule of Actual Allocations for Pension Assets and Target Allocations by Asset Class	The actual allocations for the pension assets at December 31, 2017 and 2016, and target allocations by asset class, are as follows: Percentage Target Percentage Target Of Plan Assets Allocations Of Plan Assets Allocations Asset Class 2017 2017 2016 2016 Diversified growth funds 23.8 % 28.1 % 24.1 % 29.0 % Index linked gilts 25.8 12.6 21.1 13.0 Liability driven investments 19.2 23.2 20.1 24.0 All Other Regions Equity Fund 16.6 19.6 18.7 34.0 U.K. Equity Fund 11.2 13.3 12.6 — Diversified Investment Funds 1.2 1.2 1.2 — Insurance Contracts 2.1 2.0 2.1 — Cash and cash equivalents 0.1 — 0.1 — Total 100 % 100 % 100 % 100 %
Schedule of Assumptions Used to Estimate the Actuarial Present Value of Benefit Obligations	Assumptions used to estimate the actuarial present value of benefit obligations at December 31, 2017, 2016 and 2015 are shown in the following table. These year-end values are the basis for determining net periodic costs for the following year. 2017 2016 2015 U.S. defined benefit retirement plans: Discount rates 2.8% - 3.2% 3.1% - 3.6% 3.2% - 3.7% Rate of increase in compensation 3.0% 3.0% 3.0% Expected long-term rate of return on plan assets N/A N/A N/A European defined benefit retirement plans: Discount rates 1.20% - 2.55% 1.25% - 2.95% 1.8% - 3.9% Rates of increase in compensation 2.75% - 3.0% 2.75% - 3.0% 2.8% - 3.0% Expected long-term rates of return on plan assets 2.0% – 4.75% 3.0% – 4.75% 3.0% – 5.25% Postretirement benefit plans: Discount rates 3.0% 3.3% 3.4%
Schedule of Impact of One-Percentage-Point Change in Expected Long-term Rate of Return and Discount Rate on Pension Expense and Retirement Obligation	The following table presents the impact that a one-percentage-point increase and a one-percentage-point decrease in the expected long-term rate of return and discount rate would have on the 2017 pension expense, and the impact on our retirement obligation as of December 31, 2017 for a one-percentage-point change in the discount rate: Non-Qualified (In millions) Pension Plans Retiree Plans U.K. Plan Periodic pension expense One-percentage-point increase: Expected long-term rate of return $ N/A $ N/A $ (1.7 ) Discount rate $ (0.1 ) — 0.5 One-percentage-point decrease: Expected long-term rate of return $ N/A $ N/A $ 1.7 Discount rate $ 0.2 $ — $ 0.2 Retirement obligation One-percentage-point increase in discount rate $ (1.1 ) $ (0.2 ) $ (22.3 ) One-percentage-point decrease in discount rate $ 1.2 $ 0.3 $ 28.5

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of Income Taxes and Provision for Income Taxes	Income before income taxes and the provision for income taxes, for the three years ended December 31, 2017, were as follows: (In millions) 2017 2016 2015 Income before income taxes: U.S. $ 155.5 $ 149.1 $ 164.3 International 167.7 188.5 153.9 Total income before income taxes $ 323.2 $ 337.6 $ 318.2 Provision for income taxes: Current: U.S. $ 18.9 $ (9.5 ) $ (0.3 ) International 20.3 37.1 30.1 Current provision for income taxes 39.2 27.6 29.8 Deferred: U.S. (1.9 ) 54.3 48.6 International 5.2 8.4 4.6 Deferred provision for income taxes 3.3 62.7 53.2 Total provision for income taxes $ 42.5 $ 90.3 $ 83.0
Schedule of a Reconciliation of the Provision for Income Taxes at the U.S. Federal Statutory Income Tax Rate to the Actual Income Tax Provision	A reconciliation of the provision for income taxes at the U.S. federal statutory income tax rate of 35% to the effective income tax rate, for the three years ended December 31, 2017, is as follows: (In millions) 2017 2016 2015 Provision for taxes at U.S. federal statutory rate $ 113.1 $ 118.2 $ 111.4 State and local taxes, net of federal benefit 0.2 3.1 2.5 Foreign effective rate differential (14.4 ) (26.8 ) (22.6 ) Tax credits (16.0 ) (10.1 ) (3.1 ) Change in Valuation Allowance (9.1 ) 10.4 3.1 Remeasurement of deferred taxes (67.8 ) — — Transition Tax on undistributed foreign earnings 45.7 — — Excess Tax Benefits of Stock Based Compensation (7.6 ) (2.8 ) — Other 4.9 4.9 3.3 Release of reserves for uncertain tax positions (6.5 ) (6.6 ) (11.6 ) Total provision for income taxes $ 42.5 $ 90.3 $ 83.0
Schedule of Deferred Income Taxes	Principal components of deferred income taxes as of December 31, 2017 and 2016 are: (In millions) 2017 2016 Assets Net operating loss carryforwards $ 65.1 $ 58.9 Unfunded pension liability and other postretirement obligations 0.5 5.6 Tax credit carryforwards 10.8 13.0 Stock based compensation 7.1 16.2 Other comprehensive income 0.2 4.6 Reserves and other 13.5 20.8 Subtotal 97.2 119.1 Valuation allowance (54.9 ) (58.9 ) Total assets $ 42.3 $ 60.2 Liabilities Accelerated depreciation (144.1 ) (160.6 ) Accelerated amortization (11.3 ) (12.9 ) Other (1.3 ) (0.4 ) Total liabilities $ (156.7 ) $ (173.9 ) Net deferred tax liabilities $ (114.4 ) $ (113.7 )
Schedule of Classification of Deferred Tax Assets and Deferred Tax Liabilities in Consolidated Balance Sheets	Deferred tax assets and deferred tax liabilities as presented in the consolidated balance sheets as of December 31, 2017 and 2016 are as follows and are recorded in prepaid expenses and other current assets, deferred tax assets, other accrued liabilities and other non-current liabilities in the consolidated balance sheets: (In millions) 2017 2016 Long-term deferred tax assets, net 14.3 8.9 Long-term deferred tax liability, net (128.7 ) (122.6 ) Net deferred tax liabilities $ (114.4 ) $ (113.7 )
Schedule of Unrecognized Tax Benefits	The following table summarizes the activity related to our unrecognized tax benefits. (In millions) 2017 2016 2015 Balance as of January 1, $ 16.7 $ 25.3 $ 43.1 Additions based on tax positions related to the current year 5.3 7.3 1.7 (Reductions) additions for tax positions of prior years (6.1 ) (11.1 ) (16.6 ) Expiration of the statute of limitations for the assessment of taxes (4.8 ) (4.2 ) (0.6 ) Other, including currency translation 1.2 (0.6 ) (2.3 ) Balance as of December 31, $ 12.3 $ 16.7 $ 25.3

Capital Stock (Tables)

Capital Stock (Tables)	12 Months Ended
	Dec. 31, 2017
Stockholders Equity Note [Abstract]
Schedule of Common Stock Outstanding	Common stock outstanding as of December 31, 2017, 2016 and 2015 was as follows: (Number of shares in millions) 2017 2016 2015 Common stock: Balance, beginning of year 106.7 106.0 104.8 Activity under stock plans 1.1 0.7 1.2 Balance, end of year 107.8 106.7 106.0 Treasury stock: Balance, beginning of year 15.3 12.5 9.3 Repurchased 2.9 2.8 3.2 Balance, end of year 18.2 15.3 12.5 Common stock outstanding 89.6 91.4 93.5

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Stock-Based Compensation Expense by Type of Award	The following table details the stock-based compensation expense by type of award for the years ended December 31, 2017, 2016 and 2015: Year Ended December 31, (In millions, except per share data) 2017 2016 2015 Non-qualified stock options $ 4.0 $ 3.6 $ 3.3 Restricted stock, service based (“RSUs”) 6.4 5.8 6.4 Restricted stock, performance based (“PRSUs”) 6.7 6.3 7.9 Employee stock purchase plan 0.4 0.4 0.3 Stock-based compensation expense $ 17.5 $ 16.1 $ 17.9 Tax benefit from stock exercised and converted during the period $ 7.6 $ 2.8 $ 9.2
Summary of Option Activity	A summary of option activity under the plan for the three years ended December 31, 2017 is as follows: Weighted-Average Number of Weighted- Remaining Options Average Contractual Life (In millions) Exercise Price (in years) Outstanding at December 31, 2014 2.8 $ 19.12 4.95 Options granted 0.2 $ 43.96 Options exercised (0.7 ) $ 12.77 Outstanding at December 31, 2015 2.3 $ 23.75 5.39 Options granted 0.3 $ 41.71 Options exercised (0.3 ) $ 20.17 Outstanding at December 31, 2016 2.3 $ 26.08 5.20 Options granted 0.2 $ 50.50 Options exercised (0.8 ) $ 22.34 Outstanding at December 31, 2017 1.7 $ 31.18 5.19
Schedule of Other Stock Option Statistics	Year Ended December 31, (In millions, except weighted average exercise price) 2017 2016 Aggregate intrinsic value of outstanding options $ 53.1 $ 57.2 Aggregate intrinsic value of exercisable options $ 45.8 $ 53.2 Total intrinsic value of options exercised $ 25.6 $ 6.7 Total number of options exercisable 1.3 1.8 Weighted average exercise price of options exercisable $ 25.27 $ 21.99 Total unrecognized compensation cost on nonvested options (a) $ 1.2 $ 1.1 (a) Unrecognized compensation cost relates to nonvested stock options and is expected to be recognized over the remaining vesting period ranging from one year to three years.
Schedule of Assumptions Used in Determining the Estimated the Fair Value of Stock Options	We estimated the fair value of stock options at the grant date using the Black-Scholes option pricing model with the following assumptions for the years ended December 31, 2017, 2016 and 2015: 2017 2016 2015 Risk-free interest rate 2.41 % 1.62 % 1.56 % Expected option life (in years) Executive 6.68 6.77 6.84 Expected option life (in years) Non-Executive 4.76 4.72 6.09 Dividend yield 0.9 % 1.0 % 1.0 % Volatility 34.74 % 38.41 % 35.59 % Weighted-average fair value per option granted $ 16.93 $ 14.65 $ 14.95
Summary of the Company's Service Based RSU Activity	The table presented below provides a summary of the Company’s RSU activity for the years ended December 31, 2017, 2016 and 2015: Weighted- Number of Average RSUs Grant Date (In millions) Fair Value Outstanding at December 31, 2014 0.5 $ 27.76 RSUs granted 0.1 $ 43.96 RSUs issued (0.1 ) $ 28.95 Outstanding at December 31, 2015 0.5 $ 31.73 RSUs granted 0.1 $ 42.05 RSUs issued (0.1 ) $ 37.01 Outstanding at December 31, 2016 0.5 $ 33.72 RSUs granted 0.1 $ 50.97 RSUs issued (0.1 ) $ 38.17 Outstanding at December 31, 2017 0.5 $ 36.75
Summary of the Company's PRSU Activity	The table presented below provides a summary, of the Company’s PRSU activity, at original grant amounts, for the years ended December 31, 2017, 2016 and 2015: Weighted- Number of Average PRSUs Grant Date (In millions) Fair Value Outstanding at December 31, 2014 0.4 $ 31.68 PRSUs granted 0.1 $ 43.96 PRSUs additional performance shares 0.1 $ 42.23 PRSUs issued (0.2 ) $ 24.95 Outstanding at December 31, 2015 0.4 $ 36.59 PRSUs granted 0.2 $ 43.96 PRSUs additional performance shares 0.1 $ 28.09 PRSUs issued (0.3 ) $ 28.15 Outstanding at December 31, 2016 0.4 $ 42.66 PRSUs granted 0.2 $ 50.50 PRSUs issued (0.2 ) $ 42.57 Outstanding at December 31, 2017 0.4 $ 45.35

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Summary of Earnings Per Share Basic and Diluted	Computations of basic and diluted net income per common share for the years ended December 31, 2017, 2016 and 2015, are as follows: (In millions, except per share data) 2017 2016 2015 Basic net income per common share: Net income $ 284.0 $ 249.8 $ 237.2 Weighted average common shares outstanding 90.6 92.8 95.8 Basic net income per common share $ 3.13 $ 2.69 $ 2.48 Diluted net income per common share: Weighted average common shares outstanding — Basic 90.6 92.8 95.8 Plus incremental shares from assumed conversions: Restricted stock units 0.4 0.4 0.5 Stock options 0.9 1.0 0.9 Weighted average common shares outstanding — Dilutive 91.9 94.2 97.2 Dilutive net income per common share $ 3.09 $ 2.65 $ 2.44 Anti-dilutive shares outstanding, excluded from computation 0.2 0.4 —

Derivative Financial Instrume40

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Schedule of Change in Fair Value of Foreign Currency Forward Exchange Contracts Under Hedge Designations	The activity, net of tax, in accumulated other comprehensive loss related to foreign currency forward exchange contracts for the years ended December 31, 2017, 2016 and 2015 was as follows: (In millions) 2017 2016 2015 Unrealized losses at beginning of period, net of tax $ (25.9 ) $ (15.0 ) $ (9.2 ) Losses reclassified to net sales 8.9 14.4 11.8 Increase (decrease) in fair value 25.6 (25.3 ) (17.6 ) Unrealized gains (losses) at end of period, net of taxes $ 8.6 $ (25.9 ) $ (15.0 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Schedule of Environmental Remediation Reserve Activity	Environmental remediation reserve activity for the three years ended December 31, 2017 was as follows: For the year ended December 31, (In millions) 2017 2016 2015 Beginning remediation accrual balance $ 3.2 $ 2.9 $ 5.0 Current period expenses 0.1 1.2 0.5 Cash expenditures (0.5 ) (0.9 ) (2.6 ) Ending remediation accrual balance $ 2.8 $ 3.2 $ 2.9
Schedule of Product Warranty	Warranty expense for the years ended December 31, 2017, 2016 and 2015, and accrued warranty cost, included in “other accrued liabilities” in the consolidated balance sheets were as follows: Product (In millions) Warranties Balance as of December 31, 2014 $ 11.3 Warranty expense 3.5 Deductions and other (8.7 ) Balance as of December 31, 2015 $ 6.1 Warranty expense 5.1 Deductions and other (5.7 ) Balance as of December 31, 2016 $ 5.5 Warranty expense 3.0 Deductions and other (4.9 ) Balance as of December 31, 2017 $ 3.6

Supplemental Cash Flow (Tables)

Supplemental Cash Flow (Tables)	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Schedule of Supplemental Cash Flow Information	Supplemental cash flow information, for the years ended December 31, 2017, 2016 and 2015, consisted of the following: (In millions) 2017 2016 2015 Cash paid for: Interest $ 22.6 $ 23.2 $ 9.8 Taxes $ 22.4 $ 31.7 $ 40.8

Accumulated Other Comprehensi43

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Schedule of Components of Accumulated Other Comprehensive Loss	The components of accumulated other comprehensive loss as of December 31, 2017 and 2016 were as follows: (In millions) Unrecognized Net Defined Change in Fair Value of Derivatives Foreign Currency Translation Total Balance at December 31, 2016 $ (14.6 ) $ (18.7 ) $ (141.1 ) $ (174.4 ) Other comprehensive income (loss) before reclassifications (2.9 ) 25.0 99.8 121.9 Amounts reclassified from accumulated other comprehensive loss (1.0 ) 8.5 — 7.5 Other comprehensive income (loss) (3.9 ) 33.5 99.8 129.4 Balance at December 31, 2017 $ (18.5 ) $ 14.8 $ (41.3 ) $ (45.0 )

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Schedule of Segment Reporting Information	The following table presents financial information on our segments as of December 31, 2017, 2016 and 2015, and for the years then ended. (In millions) Composite Materials Engineered Products Corporate & Other Total Third-Party Sales 2017 $ 1,597.1 $ 376.2 $ — $ 1,973.3 2016 1,610.0 394.3 — 2,004.3 2015 1,458.7 402.5 — 1,861.2 Intersegment sales 2017 $ 63.6 $ 0.4 $ (64.0 ) $ — 2016 67.6 0.1 (67.7 ) — 2015 70.4 8.5 (78.9 ) — Operating income (loss) 2017 $ 359.4 $ 48.7 $ (57.5 ) $ 350.6 2016 368.3 50.0 (58.2 ) 360.1 2015 336.2 55.8 (59.6 ) 332.4 Depreciation and amortization 2017 $ 96.8 $ 7.5 $ 0.2 $ 104.5 2016 86.0 7.2 0.1 93.3 2015 70.0 6.1 0.3 76.4 Equity in earnings from affiliated companies 2017 $ — $ 3.3 $ — $ 3.3 2016 — 2.5 — 2.5 2015 0.2 1.8 — 2.0 Segment assets 2017 $ 2,415.5 $ 279.1 $ 86.3 $ 2,780.9 2016 2,127.2 220.7 52.7 2,400.6 2015 1,892.0 239.4 56.0 2,187.4 Investments in affiliated companies 2017 $ — $ 26.5 $ 21.2 $ 47.7 2016 — 23.1 30.0 53.1 2015 10.1 20.3 — 30.4 Accrual basis additions to property, plant and equipment 2017 $ 270.3 $ 14.1 $ — $ 284.4 2016 305.2 14.9 0.1 320.2 2015 276.0 13.0 — 289.0
Schedule of Net Sales and Long-Lived Assets, by Geographic Area	Net sales and long-lived assets, by geographic area, consisted of the following for the three years ended December 31, 2017, 2016 and 2015: Spain 2017 2016 2015 Net sales by Geography (a): United States $ 937.3 $ 957.8 $ 955.4 International France 335.7 335.2 320.6 Spain 187.0 219.7 217.8 Germany 206.0 169.5 83.2 United Kingdom 160.4 154.2 125.1 Austria 86.1 92.8 93.1 Other 60.8 75.1 66.0 Total international 1,036.0 1,046.5 905.8 Total consolidated net sales $ 1,973.3 $ 2,004.3 $ 1,861.2 Net Sales to External Customers (b): United States $ 806.6 $ 833.1 $ 850.1 International Germany 217.7 210.5 163.7 Spain 199.4 204.4 149.7 France 161.5 153.8 140.3 United Kingdom 80.1 95.5 84.2 Other 508.0 507.0 473.2 Total international 1,166.7 1,171.2 1,011.1 Total $ 1,973.3 $ 2,004.3 $ 1,861.2 Long-lived assets (c): United States $ 1,304.4 $ 1,213.8 $ 1,109.9 International France 402.7 217.2 112.1 United Kingdom 151.6 130.8 133.4 Spain 61.7 56.2 59.8 Other 94.6 79.8 69.3 Total international 710.6 484.0 374.6 Total consolidated long-lived assets $ 2,015.0 $ 1,697.8 $ 1,484.5 (a) Net sales by geography based on the location in which the product sold was manufactured. (b) Net sales to external customers based on the location to which the product sold was delivered. (c) Long-lived assets primarily consist of property, plant and equipment, net and goodwill.

Quarterly Financial and Marke45

Quarterly Financial and Market Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial and Market Data	Quarterly financial and market data for the years ended December 31, 2017 and 2016 were: First Second Third Fourth (In millions, except per share data) Quarter Quarter Quarter Quarter 2017 Net sales $ 478.8 $ 491.3 $ 491.5 $ 511.7 Gross margin 134.1 139.9 135.6 142.2 Operating income 78.6 89.7 89.1 93.2 Net income 64.6 61.6 69.7 88.1 Net income per common share: Basic $ 0.71 $ 0.68 $ 0.77 $ 0.97 Diluted $ 0.70 $ 0.67 $ 0.76 $ 0.96 Market price: High $ 55.91 $ 54.93 $ 58.24 $ 63.93 Low $ 49.77 $ 49.20 $ 50.50 $ 57.43 2016 Net sales $ 497.7 $ 522.6 $ 500.5 $ 483.5 Gross margin 143.0 150.3 135.7 135.6 Operating income 83.9 100.1 89.1 87.0 Net income 56.0 66.1 68.2 59.5 Net income per common share: Basic $ 0.60 $ 0.71 $ 0.74 $ 0.65 Diluted $ 0.59 $ 0.70 $ 0.72 $ 0.64 Market price: High $ 45.40 $ 46.26 $ 45.68 $ 54.97 Low $ 38.38 $ 39.15 $ 40.82 $ 42.04

Significant Accounting Polici46

Significant Accounting Policies - Additional Information (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)customer	Dec. 31, 2016USD ($)customer	Dec. 31, 2015customer
Significant Accounting Policies [Line Items]
Deferred financing costs recorded as a non-current asset		$ 3.1	$ 4
Net deferred financing costs recorded as a non-current liability		5.5	2.5
Allowance for doubtful accounts		$ 0.3	$ 0.4
Accounting Standards Update No. 2014-09 | Scenario, Forecast
Significant Accounting Policies [Line Items]
Amount of revenue that the company expect to accelerate upon adoption of new accounting standard	$ 40
Net sales | Customer concentration
Significant Accounting Policies [Line Items]
Number of major customers | customer		2	2	2
Two customers and their related subcontractors | Net sales | Customer concentration
Significant Accounting Policies [Line Items]
Concentration percentage (as a percent)		69.00%	69.00%	66.00%
Minimum | Building and improvements
Significant Accounting Policies [Line Items]
Useful life		10 years
Minimum | Machinery and equipment
Significant Accounting Policies [Line Items]
Useful life		3 years
Minimum | Software
Significant Accounting Policies [Line Items]
Finite lived intangible assets, useful life		3 years
Maximum | Accounting Standards Update No. 2014-09 | Scenario, Forecast
Significant Accounting Policies [Line Items]
Cumulative effect of new accounting standard on opening retained earnings	$ 4
Maximum | Building and improvements
Significant Accounting Policies [Line Items]
Useful life		40 years
Maximum | Machinery and equipment
Significant Accounting Policies [Line Items]
Useful life		25 years
Maximum | Software
Significant Accounting Policies [Line Items]
Finite lived intangible assets, useful life		10 years
Aerospace Composites Malaysia Sdn. Bhd.
Significant Accounting Policies [Line Items]
Interest in affiliated company, accounted for using equity method of accounting (as a percent)		50.00%

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 126.7	$ 120.6
Work in progress	52.1	53.7
Finished goods	135.2	116.7
Total inventory	$ 314	$ 291

Net Property, Plant and Equip48

Net Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Net Property, Plant and Equipment
Property, plant and equipment	$ 2,743.9	$ 2,378.4
Less accumulated depreciation	(877.6)	(752.8)
Property, plant and equipment, net	1,866.3	1,625.6
Land
Net Property, Plant and Equipment
Property, plant and equipment	96.7	63.8
Buildings
Net Property, Plant and Equipment
Property, plant and equipment	624.2	523.2
Equipment
Net Property, Plant and Equipment
Property, plant and equipment	1,698.5	1,336.9
Construction in progress
Net Property, Plant and Equipment
Property, plant and equipment	322	454.4
Capital lease
Net Property, Plant and Equipment
Property, plant and equipment	$ 2.5	$ 0.1

Net Property, Plant and Equip49

Net Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Property, Plant and Equipment
Depreciation expense related to property, plant and equipment	$ 103.5	$ 93.3	$ 76.4
Construction in progress
Net Property, Plant and Equipment
Capitalized interest	$ 3.1	$ 1.9

Goodwill and Purchased Intang50

Goodwill and Purchased Intangible Assets - Schedule of Gross Goodwill and Other Purchased Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	$ 72.2	$ 58.9
Amortization expense	(1)	(0.3)
Additions	70.1	18.1
Currency translation adjustments and other	7.4	(4.5)
Balance at the end of the period	148.7	72.2
Composite Materials
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	56.1	42.8
Amortization expense	(1)	(0.3)
Additions	41.2	18.1
Currency translation adjustments and other	7.4	(4.5)
Balance at the end of the period	103.7	56.1
Engineered Products
Changes in the carrying amount of gross goodwill and other purchased intangibles
Balance at the beginning of the period	16.1	16.1
Additions	28.9
Balance at the end of the period	$ 45	$ 16.1

Goodwill and Purchased Intang51

Goodwill and Purchased Intangible Assets - Additional Information (Details) $ in Millions	Dec. 31, 2017USD ($)
Goodwill And Indefinite Lived Intangible Assets By Segment [Line Items]
Indefinite-lived intangible assets	$ 5.1
Definite-lived intangible asset	33.5
Goodwill	110.1
Amortization related to definite lived intangible assets, 2018	2.7
Amortization related to definite lived intangible assets, 2019	2.7
Amortization related to definite lived intangible assets, 2020	2.7
Amortization related to definite lived intangible assets, 2021	2.7
Amortization related to definite lived intangible assets, 2022	2.7
Amortization related to definite lived intangible assets, thereafter	20.2
Composite Materials
Goodwill And Indefinite Lived Intangible Assets By Segment [Line Items]
Goodwill	76.9
Engineered Products
Goodwill And Indefinite Lived Intangible Assets By Segment [Line Items]
Goodwill	$ 33.2

Debt - Schedule of Debt and Cap

Debt - Schedule of Debt and Capital Lease Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Current portion of capital lease		$ 0.5
Current portion of Euro term loan	$ 4.3	3.8
Current portion of debt	4.3	4.3
Long-term debt	805.6	684.4
Euro term loan	63.3	22.6
Other debt	0.1
Total debt	809.9	688.7
Senior unsecured credit facility - due 2021
Debt Instrument [Line Items]
Long-term debt	50	365
4.7% senior notes due 2025
Debt Instrument [Line Items]
Senior notes	300	300
4.7% senior notes due 2025 and 3.95% senior notes due 2027
Debt Instrument [Line Items]
Senior notes – original issue discount	(2.3)	(0.7)
Senior notes – deferred financing costs	(5.5)	$ (2.5)
3.95% senior notes due 2027
Debt Instrument [Line Items]
Senior notes	$ 400

Debt - Schedule of Debt and C53

Debt - Schedule of Debt and Capital Lease Obligations (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2017
Debt Instrument [Line Items]
Debt instrument, interest rate	4.70%
4.7% senior notes due 2025
Debt Instrument [Line Items]
Debt instrument, interest rate	4.70%
Debt instrument, maturity year	2,025
3.95% senior notes due 2027
Debt Instrument [Line Items]
Debt instrument, interest rate	3.95%
Debt instrument, maturity year	2,027
Senior unsecured credit facility - due 2021
Debt Instrument [Line Items]
Debt instrument, maturity year	2,021

Debt - Additional Information (

Debt - Additional Information (Details) € in Millions	1 Months Ended		12 Months Ended
	Feb. 28, 2017USD ($)	Jun. 30, 2016USD ($)tranche	Dec. 31, 2017USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2016USD ($)	Jun. 30, 2016EUR (€)
Debt Instrument [Line Items]
Debt instrument, interest rate			4.70%
Repayments of debt	$ 394,600,000
Debt instrument, covenant terms			In accordance with the terms of the Facility, we are required to maintain a minimum interest coverage ratio of 3.50 (based on the ratio of EBITDA, as defined in the Credit Agreement, to interest expense) and may not exceed a maximum leverage ratio of 3.50 (based on the ratio of total debt to EBITDA) throughout the term of the Facility.
Borrowings			$ 805,600,000		$ 684,400,000
Unamortized deferred financing costs and debt discount			$ 3,100,000		4,000,000
European term loan
Debt Instrument [Line Items]
Face value		$ 67,400,000
Debt instrument, interest rate terms			The loan has two tranches of which the first tranche for €25 million has a six-month availability period at a rate of Euribor +1.2% and a final maturity date of June 30, 2023. The second tranche for €35 million has a one-year availability period at a rate of Euribor +1.25% and a final maturity date of June 30, 2024. There is a zero percent floor on the Euribor. The loans are payable in annual installments, that began on June 30, 2017 and beginning on June 30, 2019, respectively
Number of tranches | tranche		2
Debt instrument, payment terms			annual
Required scheduled payments of debt in 2018			$ 4,300,000
Required scheduled payments of debt in 2019			9,500,000
Required scheduled payments of debt in 2020			9,500,000
Required scheduled payments of debt in 2021			9,500,000
Required scheduled payments of debt in 2022			9,500,000
Required scheduled payments of debt thereafter			25,300,000
European term loan | Euribor
Debt Instrument [Line Items]
Debt instrument, floor rate		0.00%
Level 2 | European term loan
Debt Instrument [Line Items]
Outstanding amount under loan			$ 67,600,000
Maximum
Debt Instrument [Line Items]
Interest coverage ratio required to be maintained			350.00%
Facility
Debt Instrument [Line Items]
Repayments of debt	350,000,000			$ 296,400,000
Revolving credit line
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 10,000,000
Working capital line of credit - China
Debt Instrument [Line Items]
Amount outstanding			0
3.95% senior unsecured notes due 2027
Debt Instrument [Line Items]
Face value	$ 400,000,000
Debt instrument, interest rate	3.95%
Debt instrument, maturity year	2,027
Increase in senior notes interest rate	0.25%
Effective interest rate	3.87%
3.95% senior unsecured notes due 2027 | Level 2
Debt Instrument [Line Items]
Fair value of senior notes			$ 410,000,000
3.95% senior unsecured notes due 2027 | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate	5.95%
3.95% senior unsecured notes due 2027 | Treasury Lock | Interest Lock Agreement
Debt Instrument [Line Items]
Percentage of effective interest rate benefit	0.25%		0.25%
Senior unsecured credit facility- revolving loan due 2021
Debt Instrument [Line Items]
Face value		$ 700,000,000	$ 700,000,000
Debt instrument, maturity year		2,021
Debt instrument expiration period			2021-06
Variable interest rate basis			LIBOR + 1.25%
Spread on variable interest rate basis			1.25%
Debt instrument, interest rate terms			The interest rate for the revolver at December 31, 2017 is LIBOR + 1.25%. The interest rate ranges from LIBOR + 0.875% to a maximum of LIBOR + 1.875%, depending upon the Company’s leverage ratio.
Borrowings amount utilized during the period			$ 451,000,000
Maximum amount available under credit facility to issue letters of credit			40,000,000
Letters of credit outstanding under credit facility			0
Undrawn availability under credit facility			$ 650,000,000
Weighted average interest rate			2.42%
Senior unsecured credit facility- revolving loan due 2021 | Level 2
Debt Instrument [Line Items]
Borrowings			$ 50,000,000
Senior unsecured credit facility- revolving loan due 2021 | Maximum
Debt Instrument [Line Items]
Variable interest rate basis			LIBOR + 1.875%
Spread on variable interest rate basis			1.875%
Senior unsecured credit facility- revolving loan due 2021 | Minimum
Debt Instrument [Line Items]
Variable interest rate basis			LIBOR + 0.875%
Spread on variable interest rate basis			0.875%
4.7% senior unsecured notes due 2025
Debt Instrument [Line Items]
Face value				$ 300,000,000
Debt instrument, interest rate				4.70%
Debt instrument, maturity year				2,025
Increase in senior notes interest rate				0.25%
Effective interest rate			4.84%
Unamortized deferred financing costs and debt discount			$ 2,800,000		$ 3,200,000
4.7% senior unsecured notes due 2025 | Level 2
Debt Instrument [Line Items]
Fair value of senior notes			$ 321,000,000
4.7% senior unsecured notes due 2025 | Maximum
Debt Instrument [Line Items]
Debt instrument, interest rate				6.70%
Tranche one | European term loan
Debt Instrument [Line Items]
Face value | €						€ 25
Variable interest rate basis			Euribor +1.2%
Spread on variable interest rate basis		1.20%
Debt instrument availability period		6 months
Debt instrument, maturity date			Jun. 30, 2023
Beginning date of first required loan payment			Jun. 30, 2017
Tranche two | European term loan
Debt Instrument [Line Items]
Face value | €						€ 35
Variable interest rate basis			Euribor +1.25%
Spread on variable interest rate basis		1.25%
Debt instrument, maturity date			Jun. 30, 2024
Debt instrument availability period		1 year
Beginning date of first required loan payment			Jun. 30, 2019

Leasing Arrangements - Addition

Leasing Arrangements - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating leases
Rental expenses on operating leases	$ 12	$ 11.4	$ 10.2

Leasing Arrangements - Operatin

Leasing Arrangements - Operating Lease Future Minimum Lease Payment (Details) $ in Millions	Dec. 31, 2017USD ($)
Future minimum operating lease payments
2,018	$ 10.6
2,019	8.9
2,020	6.9
2,021	6
2,022	1.8
Thereafter	2.4
Total minimum lease payments	$ 36.6

Retirement and Other Postreti57

Retirement and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Multi-Employer Plan
Minimum percentage of the Plan's total contributions contributed by the entity	5.00%	5.00%	5.00%
Employer contribution	$ 1.9	$ 2.1	$ 2.2
Expected contribution in 2018	$ 2.1
U.S. retirement saving plan
Total plan assets invested in active corporate bond funds (as a percent)	100.00%	100.00%
Amounts recognized in Accumulated Other Comprehensive Loss:
Fair value of plan assets	$ 201.8	$ 171.4
Impact of one-percentage-point increase and a one-percentage-point decrease in the discount rate on retirement obligation as of December 31, 2017
Assumed annual rate of increase in the per capita cost of covered health care benefits for medical care (as a percent)	7.00%
Assumed annual rate of increase in the per capita cost of covered health care benefits for dental and vision care (as a percent)	5.00%
Ultimate annual rate of increase in the per capita cost of covered health care benefits for medical care (as a percent)	4.75%
Ultimate annual rate of increase in the per capita cost of covered health care benefits for dental and vision care (as a percent)	5.00%
Equity Funds
Amounts recognized in Accumulated Other Comprehensive Loss:
Fair value of plan assets	$ 56.3	$ 53.8
Diversified Growth Funds
U.S. retirement saving plan
Total plan assets invested in active corporate bond funds (as a percent)	23.80%	24.10%
Amounts recognized in Accumulated Other Comprehensive Loss:
Fair value of plan assets	$ 48	$ 41.2
Liability Driven Investments
U.S. retirement saving plan
Total plan assets invested in active corporate bond funds (as a percent)	19.20%	20.10%
Amounts recognized in Accumulated Other Comprehensive Loss:
Fair value of plan assets	$ 38.7	$ 34.4
U.S. Retirement Savings Plan
U.S. retirement saving plan
Maximum percentage of employee's annual compensation allowed as contribution to individual 401(k) retirement saving account (as a percent)	75.00%
Employer contribution as a percentage of employee contribution (as a percent)	50.00%
Employer matching contribution as a percentage of employee's annual compensation (as a percent)	3.00%
U.S. Retirement Savings Plan | Minimum
U.S. retirement saving plan
Additional employer contribution as a percentage of eligible income depending on employee's age (as a percent)	2.00%
Maximum employer contribution to individual 401(k) retirement saving account, after additional contribution (as a percent)	5.00%
U.S. Retirement Savings Plan | Maximum
U.S. retirement saving plan
Employer matching contribution as a percentage of employee's annual compensation (as a percent)	4.50%
Additional employer contribution as a percentage of eligible income depending on employee's age (as a percent)	4.00%
Maximum employer contribution to individual 401(k) retirement saving account, after additional contribution (as a percent)	7.00%
UK Defined Contribution Pension Plan
U.S. retirement saving plan
Percentage of pensionable salary that eligible employees can elect to contribute under the first option	3.00%
Percentage of pensionable salary that eligible employees can elect to contribute under the second option	5.00%
Percentage of pensionable salary that eligible employees can elect to contribute under the third option	7.00%
Company's contribution under the first option (as a percent)	5.00%
Company's contribution under the second option (as a percent)	9.00%
Company's contribution under the third option (as a percent)	13.00%
European Plans
U.S. retirement saving plan
Expected long-term weighted average rate of return for next fiscal year (as a percent)	3.00%
Amounts recognized in Accumulated Other Comprehensive Loss:
Total accumulated benefit obligation	$ 20.9	17.7
Accumulated benefit obligation in excess of plan assets	$ 14.3	12
United Kingdom defined benefit plan (the U.K. Plan)
Defined Benefit Plan Disclosure [Line Items]
Long term trend rate of improvement	1.50%
U.S. retirement saving plan
Expected long-term weighted average rate of return for next fiscal year (as a percent)	4.75%
Amounts recognized in Accumulated Other Comprehensive Loss:
Total accumulated benefit obligation	$ 163.1	141.8
Fair value of plan assets	$ 195.3	165.7
United Kingdom defined benefit plan (the U.K. Plan) | Equity Funds
U.S. retirement saving plan
Total plan assets invested in active corporate bond funds (as a percent)	28.00%
United Kingdom defined benefit plan (the U.K. Plan) | Diversified Growth Funds
U.S. retirement saving plan
Total plan assets invested in active corporate bond funds (as a percent)	24.00%
United Kingdom defined benefit plan (the U.K. Plan) | Liability Driven Investments
U.S. retirement saving plan
Total plan assets invested in active corporate bond funds (as a percent)	19.00%
Defined Benefit Retirement Plans
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Estimated net actuarial gain (loss) to be recognized as a component of net periodic pension cost	$ (0.2)
Defined Benefit Retirement Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Expected employer contribution in next fiscal year	4.6
Amounts recognized in Accumulated Other Comprehensive Loss:
Total accumulated benefit obligation	21	17.9
Defined Benefit Retirement Plans | European Plans
Amounts recognized in Accumulated Other Comprehensive Loss:
Fair value of plan assets	201.8	171.4	$ 160.4
U.S. Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Expected employer contribution in next fiscal year	0.5
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Estimated net actuarial gain (loss) to be recognized as a component of net periodic pension cost	1
U.S. Non-qualified Defined Benefit Retirement Plans
Amounts recognized in Accumulated Other Comprehensive Loss:
Defined benefit retirement plans and postretirement benefit plans included within accrued compensation and benefits	5.3	2
Defined benefit retirement plans and postretirement benefit plans included within other non-current liabilities	$ 40.1	$ 38.8

Retirement and Other Postreti58

Retirement and Other Postretirement Benefit Plans - Schedule of Net Periodic Pension Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Periodic Pension Expense
Defined benefit retirement plans	$ 0.6	$ 1.6	$ 2.7
Union sponsored multi-employer pension plan	1.9	2.1	2.2
Retirement savings plans-matching contributions	9.7	7.9	4.2
Retirement savings plans-profit sharing contributions	9.2	10.6	9.7
Net periodic expense	$ 21.4	$ 22.2	$ 18.8

Retirement and Other Postreti59

Retirement and Other Postretirement Benefit Plans - Schedule of Net Periodic Cost of Defined Benefit Retirement and Postretirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net periodic benefit costs of defined benefit retirement plans
Net periodic pension cost (income)	$ 0.6	$ 1.6	$ 2.7
Defined Benefit Retirement Plans | U.S. Plans
Net periodic benefit costs of defined benefit retirement plans
Service cost	1.3	1.2	1.1
Interest cost	0.6	0.6	0.5
Net amortization	0.4	0.3	1
Termination benefits and settlement losses	0.7	0.2	0.8
Net periodic pension cost (income)	3	2.3	3.4
Defined Benefit Retirement Plans | European Plans
Net periodic benefit costs of defined benefit retirement plans
Service cost	1	0.8	0.8
Interest cost	4.6	5.4	6.1
Expected return on plan assets	(8.4)	(7.6)	(8.4)
Net amortization	0.3	0.6	0.8
Termination benefits and settlement losses	0.1	0.1
Net periodic pension cost (income)	(2.4)	(0.7)	(0.7)
U.S. Postretirement Plans
Net periodic benefit costs of defined benefit retirement plans
Interest cost	0.1	0.2	0.2
Net amortization	0.1	(0.7)	(0.6)
Net periodic pension cost (income)	$ 0.2	$ (0.5)	$ (0.4)

Retirement and Other Postreti60

Retirement and Other Postretirement Benefit Plans - Schedule of Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Postretirement Plans
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)		$ (0.9)
Amortization of actuarial (losses) gains	$ 1.1	0.7
Total recognized in other comprehensive income (pre-tax)	1.1	(0.2)
U.S. Plans | Defined Benefit Retirement Plans
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	0.1	0.1
Amortization of actuarial (losses) gains	(0.8)	(0.3)
Total recognized in other comprehensive income (pre-tax)	(0.7)	(0.2)
European Plans | Defined Benefit Retirement Plans
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income
Net loss (gain)	2.3	(5)
Amortization of actuarial (losses) gains	(0.4)	(0.7)
Effect of foreign exchange	2.5	(4)
Total recognized in other comprehensive income (pre-tax)	$ 4.4	$ (9.7)

Retirement and Other Postreti61

Retirement and Other Postretirement Benefit Plans - Schedule of Benefit Obligation, Fair Value of Plan Assets, Funded Status and Amounts Recognized in the Consolidated Financial Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in plan assets:
Fair value of plan assets - beginning of year	$ 171.4
Fair value of plan assets - end of year	201.8	$ 171.4
Postretirement Plans
Change in benefit obligation:
Benefit obligation - beginning of year	4.4	5.3
Interest cost	0.1	0.2	$ 0.2
Plan participants’ contributions	0.2	0.1
Actuarial loss (gain)		(1)
Benefits and expenses paid	(0.6)	(0.2)
Benefit obligation - end of year	4.1	4.4	5.3
Change in plan assets:
Employer contributions	0.5	0.1
Plan participants’ contributions	0.2	0.1
Benefits and expenses paid	(0.7)	(0.2)
Amounts recognized in Consolidated Balance Sheets:
Current liabilities	0.5	0.5
Non-current liabilities	3.6	3.9
Total Liabilities	4.1	4.4
Amounts recognized in Accumulated Other Comprehensive Loss:
Actuarial net (loss) gain	3.3	4.3
Total amounts recognized in accumulated other comprehensive loss	3.3	4.3
European Plans | Defined Benefit Retirement Plans
Change in benefit obligation:
Benefit obligation - beginning of year	164.1	162.8
Service cost	1	0.8	0.8
Interest cost	4.6	5.4	6.1
Actuarial loss (gain)	6.8	27.7
Acquisitions	1
Termination benefits and settlements	(0.6)	(0.2)
Benefits and expenses paid	(4.6)	(5.1)
Currency translation adjustments	17.2	(27.3)
Benefit obligation - end of year	189.5	164.1	162.8
Change in plan assets:
Fair value of plan assets - beginning of year	171.4	160.4
Actual return on plan assets	12.9	40.3
Employer contributions	5.3	6.3
Benefits and expenses paid	(4.6)	(5.1)
Termination benefits and settlements	(0.6)	(0.2)
Currency translation adjustments	17.4	(30.3)
Fair value of plan assets - end of year	201.8	171.4	160.4
Amounts recognized in Consolidated Balance Sheets:
Noncurrent Assets	32.2	23.9
Current liabilities	0.3	0.4
Non-current liabilities	19.6	16.2
Total Liabilities	19.9	16.6
Amounts recognized in Accumulated Other Comprehensive Loss:
Actuarial net (loss) gain	(26.6)	(22.1)
Prior service cost	(0.1)	(0.1)
Total amounts recognized in accumulated other comprehensive loss	(26.7)	(22.2)
U.S. Plans | Defined Benefit Retirement Plans
Change in benefit obligation:
Benefit obligation - beginning of year	19.7	17.7
Service cost	1.3	1.2	1.1
Interest cost	0.6	0.6	0.5
Actuarial loss (gain)	0.1	0.2
Termination benefits and settlements	0.2	0.2
Benefits and expenses paid	(0.5)	(0.2)
Benefit obligation - end of year	21.4	19.7	$ 17.7
Change in plan assets:
Employer contributions	0.5	0.2
Benefits and expenses paid	(0.5)	(0.2)
Amounts recognized in Consolidated Balance Sheets:
Current liabilities	4.5	1.1
Non-current liabilities	16.9	18.6
Total Liabilities	21.4	19.7
Amounts recognized in Accumulated Other Comprehensive Loss:
Actuarial net (loss) gain	(3.1)	(3.8)
Total amounts recognized in accumulated other comprehensive loss	$ (3.1)	$ (3.8)

Retirement and Other Postreti62

Retirement and Other Postretirement Benefit Plans - Schedule of Expected Benefit Payments for the Plan (Details) $ in Millions	Dec. 31, 2017USD ($)
U.S. Postretirement Plans
Expected benefit payments for the plans
2,018	$ 0.5
2,019	0.5
2,020	0.5
2,021	0.5
2,022	0.5
2023-2027	1.5
Aggregate expected benefit payments	4
U.S. Plans | Defined Benefit Retirement Plans
Expected benefit payments for the plans
2,018	4.6
2,019	1
2,020	2.7
2,021	2.9
2,022	1.2
2023-2027	14.4
Aggregate expected benefit payments	26.8
European Plans | Defined Benefit Retirement Plans
Expected benefit payments for the plans
2,018	4.7
2,019	4.9
2,020	5.2
2,021	7.2
2,022	6.6
2023-2027	41
Aggregate expected benefit payments	$ 69.6

Retirement and Other Postreti63

Retirement and Other Postretirement Benefit Plans - Schedule of Pension Assets Measured at Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	$ 201.8	$ 171.4
Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	56.3	53.8
Diversified Growth Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	48	41.2
Liability Driven Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	38.7	34.4
Other Insurance Product Line
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	4.2	3.6
Index Linked Gilts
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	52.1	36.1
Diversified Investment, Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	2.3	2.1
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	0.2	0.2
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	0.2	0.2
Level 1 | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	0.2	0.2
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	195.1	165.5
Level 2 | Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	56.3	53.8
Level 2 | Diversified Growth Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	48	41.2
Level 2 | Liability Driven Investments
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	38.7	34.4
Level 2 | Index Linked Gilts
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	52.1	36.1
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	6.5	5.7	$ 5.6
Actual return on plan assets	0.3	0.3
Purchases, sales and settlements	(0.3)
Changes due to exchange rates	0.8	(0.2)
Level 3 | Other Insurance Product Line
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	4.2	3.6	3.5
Actual return on plan assets	0.2	0.2
Purchases, sales and settlements	(0.1)
Changes due to exchange rates	0.5	(0.1)
Level 3 | Diversified Investment, Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value measurements	2.3	2.1	$ 2.1
Actual return on plan assets	0.1	0.1
Purchases, sales and settlements	(0.2)
Changes due to exchange rates	$ 0.3	$ (0.1)

Retirement and Other Postreti64

Retirement and Other Postretirement Benefit Plans - Schedule of Actual Allocations for the Pension Assets and Target Allocations by Asset Class (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Change in plan assets:
Percentage Of Plan Assets	100.00%	100.00%
Target Allocations	100.00%	100.00%
Diversified Growth Funds
Change in plan assets:
Percentage Of Plan Assets	23.80%	24.10%
Target Allocations	28.10%	29.00%
Index Linked Gilts
Change in plan assets:
Percentage Of Plan Assets	25.80%	21.10%
Target Allocations	12.60%	13.00%
Liability Driven Investments
Change in plan assets:
Percentage Of Plan Assets	19.20%	20.10%
Target Allocations	23.20%	24.00%
All Other Regions Equity Fund
Change in plan assets:
Percentage Of Plan Assets	16.60%	18.70%
Target Allocations	19.60%	34.00%
U.K. Equity Fund
Change in plan assets:
Percentage Of Plan Assets	11.20%	12.60%
Target Allocations	13.30%
Diversified Investment, Funds
Change in plan assets:
Percentage Of Plan Assets	1.20%	1.20%
Target Allocations	1.20%
Other Insurance Product Line
Change in plan assets:
Percentage Of Plan Assets	2.10%	2.10%
Target Allocations	2.00%
Cash and Cash Equivalents
Change in plan assets:
Percentage Of Plan Assets	0.10%	0.10%

Retirement and Other Postreti65

Retirement and Other Postretirement Benefit Plans - Schedule of Assumptions Used to Estimate the Actuarial Value of Benefit Obligations (Details)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Retirement Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Rate of increase in compensation	3.00%	3.00%	3.00%
Defined Benefit Retirement Plans | Minimum | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	2.80%	3.10%	3.20%
Defined Benefit Retirement Plans | Minimum | European Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	1.20%	1.25%	1.80%
Rate of increase in compensation	2.75%	2.75%	2.80%
Expected long-term rate of return on plan assets	2.00%	3.00%	3.00%
Defined Benefit Retirement Plans | Maximum | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.20%	3.60%	3.70%
Defined Benefit Retirement Plans | Maximum | European Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	2.55%	2.95%	3.90%
Rate of increase in compensation	3.00%	3.00%	3.00%
Expected long-term rate of return on plan assets	4.75%	4.75%	5.25%
U.S. Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.00%	3.30%	3.40%

Retirement and Other Postreti66

Retirement and Other Postretirement Benefit Plans - Schedule of Impact of One-Percentage-Point Change in Expected Long-term Rate of Return and Discount Rate on Pension Expense and Retirement Obligation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
U.S. Non-qualified Defined Benefit Retirement Plans
Impact of one-percentage-point increase and a one-percentage-point decrease in the expected long-term rate of return and discount rate on periodic pension expense in next fiscal year
One-percentage-point increase in discount rate	$ (0.1)
One-percentage-point decrease in discount rate	0.2
Impact of one-percentage-point increase and a one-percentage-point decrease in the discount rate on retirement obligation as of December 31, 2017
One-percentage-point increase in discount rate	(1.1)
One-percentage-point decrease in discount rate	1.2
Retiree Plans
Impact of one-percentage-point increase and a one-percentage-point decrease in the discount rate on retirement obligation as of December 31, 2017
One-percentage-point increase in discount rate	(0.2)
One-percentage-point decrease in discount rate	0.3
United Kingdom defined benefit plan (the U.K. Plan)
Impact of one-percentage-point increase and a one-percentage-point decrease in the expected long-term rate of return and discount rate on periodic pension expense in next fiscal year
One-percentage-point increase in expected long-term rate of return	(1.7)
One-percentage-point increase in discount rate	0.5
One-percentage-point decrease in expected long-term rate of return	1.7
One-percentage-point decrease in discount rate	0.2
Impact of one-percentage-point increase and a one-percentage-point decrease in the discount rate on retirement obligation as of December 31, 2017
One-percentage-point increase in discount rate	(22.3)
One-percentage-point decrease in discount rate	$ 28.5

Income Taxes - Schedule of Inco

Income Taxes - Schedule of Income Taxes and Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income before income taxes:
U.S.	$ 155.5	$ 149.1	$ 164.3
International	167.7	188.5	153.9
Income before income taxes, and equity in earnings of affiliated companies	323.2	337.6	318.2
Current:
U.S.	18.9	(9.5)	(0.3)
International	20.3	37.1	30.1
Current provision for income taxes	39.2	27.6	29.8
Deferred:
U.S.	(1.9)	54.3	48.6
International	5.2	8.4	4.6
Deferred provision for income taxes	3.3	62.7	53.2
Total provision for income taxes	$ 42.5	$ 90.3	$ 83

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
U.S. federal statutory income tax rate (as a percent)		35.00%
Provision for income taxes		$ 42,500,000	$ 90,300,000	$ 83,000,000
Remeasurement of deferred taxes		67,800,000
Net change in the total valuation allowance		(4,000,000)	1,100,000
Tax credit carryforwards for U.S. state tax purposes		10,800,000
Unrecognized tax benefits		12,300,000	16,700,000	25,300,000	$ 43,100,000
Unrecognized tax benefits that impact on effective tax rate		11,300,000
Interest expense (income) related to unrecognized tax benefit		300,000	1,100,000	$ 600,000
Interest accrued on unrecognized tax benefits		800,000	$ 2,100,000
Interest related to the unrecognized tax benefit reversed		1,800,000
Minimum
Operating Loss Carryforwards [Line Items]
Decrease in reasonably possible unrecognized tax benefits within next twelve months		2,000,000
Maximum
Operating Loss Carryforwards [Line Items]
Decrease in reasonably possible unrecognized tax benefits within next twelve months		3,000,000
U.S.
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		$ 25,600,000
U.S. | Minimum
Operating Loss Carryforwards [Line Items]
Statute of limitations on years that can be open for examination		3 years
U.S. | Maximum
Operating Loss Carryforwards [Line Items]
Statute of limitations on years that can be open for examination		5 years
Foreign country
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		$ 242,000,000
Valuation allowance on net operating losses		$ 202,900,000
Foreign country | Minimum
Operating Loss Carryforwards [Line Items]
Statute of limitations on years that can be open for examination		3 years
Foreign country | Maximum
Operating Loss Carryforwards [Line Items]
Statute of limitations on years that can be open for examination		5 years
China
Operating Loss Carryforwards [Line Items]
Carryforward period		5 years
ACT
Operating Loss Carryforwards [Line Items]
U.S. federal statutory income tax rate (as a percent)		35.00%
Provision for income taxes		$ 22,100,000
Reduction in effective tax rate (as a percent)		6.80%
Remeasurement of deferred taxes		$ 67,800,000
Unremitted earnings taxation period		8 years
Transition tax on undistributed foreign earnings, net of foreign tax credits		$ 45,700,000
ACT | Scenario, Forecast
Operating Loss Carryforwards [Line Items]
U.S. federal statutory income tax rate (as a percent)	21.00%

Income Taxes - Schedule of a Re

Income Taxes - Schedule of a Reconciliation of the Provision for Income Taxes at the U.S. Federal Statutory Income Tax Rate to the Actual Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of provision for income taxes at U.S. federal statutory income tax rate to effective income tax rate
Provision for taxes at U.S. federal statutory rate	$ 113.1	$ 118.2	$ 111.4
State and local taxes, net of federal benefit	0.2	3.1	2.5
Foreign effective rate differential	(14.4)	(26.8)	(22.6)
Tax credits	(16)	(10.1)	(3.1)
Change in Valuation Allowance	(9.1)	10.4	3.1
Remeasurement of deferred taxes	(67.8)
Transition Tax on undistributed foreign earnings	45.7
Excess Tax Benefits of Stock Based Compensation	(7.6)	(2.8)
Other	4.9	4.9	3.3
Release of reserves for uncertain tax positions	(6.5)	(6.6)	(11.6)
Total provision for income taxes	$ 42.5	$ 90.3	$ 83

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Assets
Net operating loss carryforwards	$ 65.1	$ 58.9
Unfunded pension liability and other postretirement obligations	0.5	5.6
Tax credit carryforwards	10.8	13
Stock based compensation	7.1	16.2
Other comprehensive income	0.2	4.6
Reserves and other	13.5	20.8
Subtotal	97.2	119.1
Valuation allowance	(54.9)	(58.9)
Total assets	42.3	60.2
Liabilities
Accelerated depreciation	(144.1)	(160.6)
Accelerated amortization	(11.3)	(12.9)
Other	(1.3)	(0.4)
Total liabilities	(156.7)	(173.9)
Net deferred tax liabilities	$ (114.4)	$ (113.7)

Income Taxes - Schedule of Clas

Income Taxes - Schedule of Classification of Deferred Tax Assets and Deferred Tax Liabilities in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets and deferred tax liabilities as presented in consolidated balance sheets
Long-term deferred tax assets, net	$ 14.3	$ 8.9
Long-term deferred tax liability, net	(128.7)	(122.6)
Net deferred tax liabilities	$ (114.4)	$ (113.7)

Income Taxes - Schedule of Unre

Income Taxes - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Activity related to unrecognized tax benefit
Balance at the beginning of the period	$ 16.7	$ 25.3	$ 43.1
Additions based on tax positions related to the current year	5.3	7.3	1.7
(Reductions) additions for tax positions of prior years	(6.1)	(11.1)	(16.6)
Expiration of the statute of limitations for the assessment of taxes	(4.8)	(4.2)	(0.6)
Other, including currency translation	1.2	(0.6)	(2.3)
Balance at the end of the period	$ 12.3	$ 16.7	$ 25.3

Capital Stock - Schedule of Com

Capital Stock - Schedule of Common Stock Outstanding (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Common stock:
Balance, beginning of year	106.7	106	104.8
Activity under stock plans	1.1	0.7	1.2
Balance, end of year	107.8	106.7	106
Treasury stock:
Balance, beginning of year	15.3	12.5	9.3
Repurchased	2.9	2.8	3.2
Balance, end of year	18.2	15.3	12.5
Common stock outstanding	89.6	91.4	93.5

Capital Stock - Additional Info

Capital Stock - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 28, 2017	Oct. 31, 2015	Jun. 30, 2014
Equity Class Of Treasury Stock [Line Items]
Authorized amount to repurchase outstanding common stock				$ 300,000,000	$ 250,000,000
Remaining authorized amount to repurchase outstanding common stock	$ 242,500,000
Total cost of shares repurchased	150,300,000	$ 111,100,000	$ 146,100,000
Dividends paid on common stock	$ 42,600,000	$ 39,800,000	$ 38,300,000
Dividends per share of common stock	$ 0.47	$ 0.44	$ 0.40
2014 Repurchase Plan
Equity Class Of Treasury Stock [Line Items]
Authorized amount to repurchase outstanding common stock						$ 150,000,000

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Stock-Based Compensation Expense by Type of Award (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 17.5	$ 16.1	$ 17.9
Tax benefit from stock exercised and converted during the period	7.6	2.8	9.2
Non-qualified stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	4	3.6	3.3
Restricted stock, service based (“RSUs”)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	6.4	5.8	6.4
Restricted stock, performance based (“PRSUs”)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	6.7	6.3	7.9
Employee stock purchase plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 0.4	$ 0.4	$ 0.3

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017USD ($)itemshares	Dec. 31, 2016USD ($)shares	Dec. 31, 2015shares	Dec. 31, 2014shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost	$ 7,200,000
Cash received from stock option exercises and employee stock purchases	16,200,000
Cash used for shares withheld to satisfy employee tax obligations for RSUs and PRSUs converted	$ 5,700,000
Shares authorized for future grant under stock plan (in shares) | shares	1,600,000
Non-qualified stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options vesting period	3 years
Options expiration period	10 years
Period of historical option activity considered to determine expected option life	10 years
Number of separate employee groups | item	2
Unrecognized compensation cost	$ 1,200,000	$ 1,100,000
Non-qualified stock options | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period over which unrecognized compensation costs will be recognized	1 year
Non-qualified stock options | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period over which unrecognized compensation costs will be recognized	3 years
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding | shares	490,739	500,000	500,000	500,000
RSUs | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period over which unrecognized compensation costs will be recognized	1 year
RSUs | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period over which unrecognized compensation costs will be recognized	3 years
PRSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding | shares	367,760	400,000	400,000	400,000
Unrecognized compensation cost	$ 2,000,000
Performance period	3 years	3 years	3 years
PRSUs | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period over which unrecognized compensation costs will be recognized	1 year
Performance period	3 years
PRSUs | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period over which unrecognized compensation costs will be recognized	3 years
Employee stock purchase plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum contribution by eligible employees as percentage of base earnings (as a percent)	10.00%
Maximum contribution by eligible employees in a calendar year	$ 25,000
Common stock purchase price as percentage of fair market value (as a percent)	85.00%
Shares purchased under employee stock purchase plan (in shares) | shares	52,824	47,952

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Option Activity (Details) - Non-qualified stock options - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of Options
Outstanding at the beginning of the period	2.3	2.3	2.8
Options granted	0.2	0.3	0.2
Options exercised	(0.8)	(0.3)	(0.7)
Outstanding at the end of the period	1.7	2.3	2.3	2.8
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 26.08	$ 23.75	$ 19.12
Options granted (in dollars per share)	50.50	41.71	43.96
Options exercised (in dollars per share)	22.34	20.17	12.77
Outstanding at the end of the period (in dollars per share)	$ 31.18	$ 26.08	$ 23.75	$ 19.12
Weighted-Average Remaining Contractual Life
Weighted-Average Remaining Contractual Life	5 years 2 months 8 days	5 years 2 months 12 days	5 years 4 months 20 days	4 years 11 months 12 days

Stock-Based Compensation - Sc78

Stock-Based Compensation - Schedule of Other Stock Option Statistics (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other disclosures
Total unrecognized compensation cost on nonvested options	$ 7.2
Non-qualified stock options
Other disclosures
Aggregate intrinsic value of outstanding options	53.1	$ 57.2
Aggregate intrinsic value of exercisable options	45.8	53.2
Total intrinsic value of options exercised	$ 25.6	$ 6.7
Total number of options exercisable (in shares)	1.3	1.8
Weighted average exercise price of options exercisable (in dollars per share)	$ 25.27	$ 21.99
Total unrecognized compensation cost on nonvested options	$ 1.2	$ 1.1

Stock-Based Compensation - Sc79

Stock-Based Compensation - Schedule of Other Stock Option Statistics (Parenthetical) (Details) - Non-qualified stock options	12 Months Ended
	Dec. 31, 2017
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period over which unrecognized compensation costs will be recognized	1 year
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period over which unrecognized compensation costs will be recognized	3 years

Stock-Based Compensation - Sc80

Stock-Based Compensation - Schedule of Assumptions Used in Determining the Estimated the Fair Value of Stock Options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assumptions used in determining the estimated fair value of stock options
Risk-free interest rate (as a percent)	2.41%	1.62%	1.56%
Expected option life, Executive	6 years 8 months 4 days	6 years 9 months 7 days	6 years 10 months 2 days
Expected option life, Non-Executive	4 years 9 months 3 days	4 years 8 months 19 days	6 years 1 month 2 days
Dividend yield (as a percent)	0.90%	1.00%	1.00%
Volatility (as a percent)	34.74%	38.41%	35.59%
Weighted-average fair value per option granted	$ 16.93	$ 14.65	$ 14.95

Stock-Based Compensation - Su81

Stock-Based Compensation - Summary of the Company's Service Based RSU Activity (Details) - RSUs - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of RSUs
Outstanding at the beginning of the period	500,000	500,000	500,000
Granted	100,000	100,000	100,000
Issued	(100,000)	(100,000)	(100,000)
Outstanding at the end of the period	490,739	500,000	500,000
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period	$ 33.72	$ 31.73	$ 27.76
Granted	50.97	42.05	43.96
Issued	38.17	37.01	28.95
Outstanding at the end of the period	$ 36.75	$ 33.72	$ 31.73

Stock-Based Compensation - Su82

Stock-Based Compensation - Summary of the Company's PRSU Activity (Details) - PRSUs - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of PRSUs
Outstanding at the beginning of the period	400,000	400,000	400,000
Granted	200,000	200,000	100,000
Additional performance shares		100,000	100,000
Issued	(200,000)	(300,000)	(200,000)
Outstanding at the end of the period	367,760	400,000	400,000
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period	$ 42.66	$ 36.59	$ 31.68
Granted	50.50	43.96	43.96
Additional performance shares		28.09	42.23
Issued	42.57	28.15	24.95
Outstanding at the end of the period	$ 45.35	$ 42.66	$ 36.59

Net Income Per Common Share (De

Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic net income per common share:
Net income	$ 284	$ 249.8	$ 237.2
Weighted average common shares outstanding — Basic (in shares)	90.6	92.8	95.8
Basic net income per common share	$ 3.13	$ 2.69	$ 2.48
Diluted net income per common share:
Weighted average common shares outstanding — Basic (in shares)	90.6	92.8	95.8
Plus incremental shares from assumed conversions:
Restricted stock units (in shares)	0.4	0.4	0.5
Stock options (in shares)	0.9	1	0.9
Weighted average common shares outstanding — Dilutive (in shares)	91.9	94.2	97.2
Dilutive net income per common share	$ 3.09	$ 2.65	$ 2.44
Anti-dilutive shares outstanding, excluded from computation (in shares)	0.2	0.4

Derivative Financial Instrume84

Derivative Financial Instruments - Additional Information (Details) € in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017USD ($)item	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2017EUR (€)item
Derivative [Line Items]
Number of interest rate swaps | item		2			2
Foreign currency unrealized gains expected to be reclassified into earnings over next twelve months		$ 3,500,000
Foreign currency unrealized gains expected to be reclassified into earnings over next twelve months, tax		1,700,000
3.95% senior unsecured notes due 2027
Derivative [Line Items]
Proceeds from issue of senior notes in settlement of derivatives		$ 10,000,000
Interest Rate Swap Agreements
Derivative [Line Items]
Derivative fixed interest rate (as a percent)		0.50%			0.50%
Carrying value / fair value of derivative liabilities included in other liabilities		$ 400,000	$ 100,000
Interest Rate Swap Agreements | U.S. dollars
Derivative [Line Items]
Variable Rate Basis		LIBOR
Interest Rate Swap Agreements | EUR
Derivative [Line Items]
Variable Rate Basis		EURIBOR
Swaps maturing September 2019
Derivative [Line Items]
Average fixed interest rate (as a percent)		1.09%			1.09%
Interest Rate Swap Final Maturity Period One
Derivative [Line Items]
Final maturity date of swap amortization		Jun. 30, 2023
Interest Rate Swap Final Maturity Period Two
Derivative [Line Items]
Final maturity date of swap amortization		Jun. 30, 2024
Treasury Lock | Interest Lock Agreement | 3.95% senior unsecured notes due 2027
Derivative [Line Items]
Percentage of reduction in effective interest rate on senior notes	0.25%	0.25%
Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Number of credit contingency features | item		0
Foreign Currency Forward Exchange Contracts | Cash Flow Hedging
Derivative [Line Items]
Gains (losses) in other comprehensive income, effective portion		$ 34,600,000	(32,200,000)	$ (26,700,000)
Designated as Hedging Instrument | Interest Rate Swap Agreements
Derivative [Line Items]
Floating rate obligation		50,000,000			€ 56.4
Carrying value / fair value of derivative assets included in other assets		800,000	700,000
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Carrying value / fair value of derivative assets included in other assets		14,700,000
Carrying value / fair value of derivative liabilities included in other liabilities		2,800,000	33,900,000
Notional amount		285,400,000	423,800,000
Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts | Cash Flow Hedging
Derivative [Line Items]
Net gain (loss) recognized in gross margin		(11,300,000)	(19,400,000)	(17,800,000)
Not Designated as Hedging Instrument | Foreign Currency Forward Exchange Contracts
Derivative [Line Items]
Carrying value / fair value of derivative assets included in other assets		1,300,000
Carrying value / fair value of derivative liabilities included in other liabilities		100,000
Foreign exchange net gain (losses) on derivative contracts not designated as hedges		$ 17,100,000	$ (900,000)	$ (14,900,000)

Derivative Financial Instrume85

Derivative Financial Instruments - Schedule of Change in Fair Value of Foreign Currency Forward Exchange Contracts Under Hedge Designations (Details) - Designated as Hedging Instrument - Foreign Currency Forward Exchange Contracts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Unrealized losses at beginning of period, net of tax	$ (25.9)	$ (15)	$ (9.2)
Losses reclassified to net sales	8.9	14.4	11.8
Increase (decrease) in fair value	25.6	(25.3)	(17.6)
Unrealized gains (losses) at end of period, net of taxes	$ 8.6	$ (25.9)	$ (15)

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details)	1 Months Ended	12 Months Ended
	Mar. 31, 2016USD ($)mi	Dec. 31, 2017USD ($)entity	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		$ 2,800,000	$ 3,200,000	$ 2,900,000	$ 5,000,000
Aggregate environmental accruals included in current other accrued liabilities		900,000	1,400,000
Amount which is better estimate within range		0	0
Remediation accrual balance if accrued at high end of the range of possible outcomes		16,000,000	16,000,000
Environmental remediation spending charged to reserve balance		500,000	800,000
Operating costs relating to environmental compliance		9,900,000	10,100,000
Omega Chemical Corporation Superfund Site, Whittier | California
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		$ 600,000	600,000
Contribution to waste tonnage (as a percent)		1.07%
Lower Passaic River
Loss Contingencies [Line Items]
Number of entities, in addition to Hexcel, who received a directive from the New Jersey Department of Environmental Protection | entity		51
Portion of the river for which Record of Decision setting forth the EPA's selected remedy (in miles) | mi	8
Portion of upper miles of river for which EPA not yet selected remedy | mi	9
Accrual for environmental loss contingencies		$ 2,000,000	$ 2,100,000
Lower Passaic River | Minimum
Loss Contingencies [Line Items]
Expected cost of capping and dredging of the lower eight miles of the river by EPA	$ 970,000,000
Lower Passaic River | Maximum
Loss Contingencies [Line Items]
Expected cost of capping and dredging of the lower eight miles of the river by EPA	$ 2,070,000,000

Commitments and Contingencies87

Commitments and Contingencies - Schedule of Environmental Remediation Reserve Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Environmental remediation reserve activity
Beginning remediation accrual balance	$ 3.2	$ 2.9	$ 5
Current period expenses	0.1	1.2	0.5
Cash expenditures	(0.5)	(0.9)	(2.6)
Ending remediation accrual balance	$ 2.8	$ 3.2	$ 2.9

Commitments and Contingencies88

Commitments and Contingencies - Schedule of Product Warranty (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Changes in accrued product warranty cost
Balance at the beginning of the period	$ 5.5	$ 6.1	$ 11.3
Warranty expense	3	5.1	3.5
Deductions and other	(4.9)	(5.7)	(8.7)
Balance at the end of the period	$ 3.6	$ 5.5	$ 6.1

Supplemental Cash Flow - Schedu

Supplemental Cash Flow - Schedule of Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash paid for:
Interest	$ 22.6	$ 23.2	$ 9.8
Taxes	$ 22.4	$ 31.7	$ 40.8

Accumulated Other Comprehensi90

Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 1,244.9	$ 1,179.6	$ 1,149.9
Other comprehensive income (loss) before reclassifications	121.9
Amounts reclassified from accumulated other comprehensive loss	7.5
Total other comprehensive income (loss)	129.4	(50.5)	(54.2)
Balance	1,495.1	1,244.9	1,179.6
Unrecognized Net Defined
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(14.6)
Other comprehensive income (loss) before reclassifications	(2.9)
Amounts reclassified from accumulated other comprehensive loss	(1)
Total other comprehensive income (loss)	(3.9)
Balance	(18.5)	(14.6)
Change in Fair Value of Derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(18.7)
Other comprehensive income (loss) before reclassifications	25
Amounts reclassified from accumulated other comprehensive loss	8.5
Total other comprehensive income (loss)	33.5
Balance	14.8	(18.7)
Foreign Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(141.1)
Other comprehensive income (loss) before reclassifications	99.8
Total other comprehensive income (loss)	99.8
Balance	(41.3)	(141.1)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(174.4)	(123.9)	(69.7)
Total other comprehensive income (loss)	129.4	(50.5)	(54.2)
Balance	$ (45)	$ (174.4)	$ (123.9)

Accumulated Other Comprehensi91

Accumulated Other Comprehensive Loss - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Unrecognized Net Defined Plan Costs
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification adjustment from AOCI on unrecognized net defined plan costs, net gains	$ 1.2
Reclassification adjustment from AOCI on unrecognized net defined plan costs, tax	0.2
Change in Fair Value of Derivatives Products | Foreign Currency Forward Exchange Contracts
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification adjustment from AOCI on derivatives, net gains	11.3
Reclassification adjustment from AOCI on derivatives, tax benefit	2.3
Change in Fair Value of Derivatives Products | Interest Rate Swap Agreements
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification adjustment from AOCI on derivatives, net gains	0.8
Reclassification adjustment from AOCI on derivatives, tax benefit	$ 0.3

Segment Information - Additiona

Segment Information - Additional Information (Details) - item	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Number of reporting segments	2
Net sales | Customer concentration | Airbus and its subcontractors
Segment Reporting Information [Line Items]
Concentration percentage (as a percent)	44.00%	41.00%	35.00%
Net sales | Customer concentration | Airbus and its subcontractors | Commercial Aerospace Market Applications
Segment Reporting Information [Line Items]
Concentration percentage (as a percent)	40.00%
Net sales | Customer concentration | Airbus and its subcontractors | Space & Defense Market Applications
Segment Reporting Information [Line Items]
Concentration percentage (as a percent)	4.00%
Net sales | Customer concentration | Airbus and its subcontractors | Composite Materials
Segment Reporting Information [Line Items]
Concentration percentage (as a percent)	50.00%	48.00%	42.00%
Net sales | Customer concentration | Boeing company and its subcontractors
Segment Reporting Information [Line Items]
Concentration percentage (as a percent)	25.00%	28.00%	31.00%
Net sales | Customer concentration | Boeing company and its subcontractors | Commercial Aerospace Market Applications
Segment Reporting Information [Line Items]
Concentration percentage (as a percent)	23.00%
Net sales | Customer concentration | Boeing company and its subcontractors | Space & Defense Market Applications
Segment Reporting Information [Line Items]
Concentration percentage (as a percent)	2.00%
Net sales | Customer concentration | Boeing company and its subcontractors | Composite Materials
Segment Reporting Information [Line Items]
Concentration percentage (as a percent)	16.00%	17.00%	21.00%
Net sales | Customer concentration | Boeing company and its subcontractors | Engineered Products
Segment Reporting Information [Line Items]
Concentration percentage (as a percent)	64.00%	69.00%	71.00%

Segment Information - Schedule

Segment Information - Schedule of Operating Segment Reporting Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Sales	$ 511.7	$ 491.5	$ 491.3	$ 478.8	$ 483.5	$ 500.5	$ 522.6	$ 497.7	$ 1,973.3	$ 2,004.3	$ 1,861.2
Operating income (loss)	93.2	$ 89.1	$ 89.7	$ 78.6	87	$ 89.1	$ 100.1	$ 83.9	350.6	360.1	332.4
Depreciation and amortization									104.5	93.3	76.4
Equity in earnings from affiliated companies									3.3	2.5	2
Segment assets	2,780.9				2,400.6				2,780.9	2,400.6	2,187.4
Investments in affiliated companies	47.7				53.1				47.7	53.1	30.4
Accrual basis additions to property, plant and equipment									284.4	320.2	289
Corporate & Other and Intersegment Elimination
Segment Reporting Information [Line Items]
Sales									(64)	(67.7)	(78.9)
Operating income (loss)									(57.5)	(58.2)	(59.6)
Depreciation and amortization									0.2	0.1	0.3
Segment assets	86.3				52.7				86.3	52.7	56
Investments in affiliated companies	21.2				30				21.2	30
Accrual basis additions to property, plant and equipment										0.1
Composite Materials
Segment Reporting Information [Line Items]
Sales									1,597.1	1,610	1,458.7
Composite Materials | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									359.4	368.3	336.2
Depreciation and amortization									96.8	86	70
Equity in earnings from affiliated companies											0.2
Segment assets	2,415.5				2,127.2				2,415.5	2,127.2	1,892
Investments in affiliated companies											10.1
Accrual basis additions to property, plant and equipment									270.3	305.2	276
Composite Materials | Intersegment Elimination
Segment Reporting Information [Line Items]
Sales									63.6	67.6	70.4
Engineered Products
Segment Reporting Information [Line Items]
Sales									376.2	394.3	402.5
Engineered Products | Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									48.7	50	55.8
Depreciation and amortization									7.5	7.2	6.1
Equity in earnings from affiliated companies									3.3	2.5	1.8
Segment assets	279.1				220.7				279.1	220.7	239.4
Investments in affiliated companies	$ 26.5				$ 23.1				26.5	23.1	20.3
Accrual basis additions to property, plant and equipment									14.1	14.9	13
Engineered Products | Intersegment Elimination
Segment Reporting Information [Line Items]
Sales									$ 0.4	$ 0.1	$ 8.5

Segment Information - Schedul94

Segment Information - Schedule of Net Sales and Long-Lived Assets, by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales and long-lived assets
Net sales	$ 511.7	$ 491.5	$ 491.3	$ 478.8	$ 483.5	$ 500.5	$ 522.6	$ 497.7	$ 1,973.3	$ 2,004.3	$ 1,861.2
Consolidated long-lived assets	2,015				1,697.8				2,015	1,697.8	1,484.5
United States
Net sales and long-lived assets
Consolidated long-lived assets	1,304.4				1,213.8				1,304.4	1,213.8	1,109.9
United States | Net sales by Geography
Net sales and long-lived assets
Net sales									937.3	957.8	955.4
United States | Net Sales by External Customers
Net sales and long-lived assets
Net sales									806.6	833.1	850.1
International
Net sales and long-lived assets
Consolidated long-lived assets	710.6				484				710.6	484	374.6
International | Net sales by Geography
Net sales and long-lived assets
Net sales									1,036	1,046.5	905.8
International | Net Sales by External Customers
Net sales and long-lived assets
Net sales									1,166.7	1,171.2	1,011.1
France
Net sales and long-lived assets
Consolidated long-lived assets	402.7				217.2				402.7	217.2	112.1
France | Net sales by Geography
Net sales and long-lived assets
Net sales									335.7	335.2	320.6
France | Net Sales by External Customers
Net sales and long-lived assets
Net sales									161.5	153.8	140.3
Germany | Net sales by Geography
Net sales and long-lived assets
Net sales									206	169.5	83.2
Germany | Net Sales by External Customers
Net sales and long-lived assets
Net sales									217.7	210.5	163.7
Spain
Net sales and long-lived assets
Consolidated long-lived assets	61.7				56.2				61.7	56.2	59.8
Spain | Net sales by Geography
Net sales and long-lived assets
Net sales									187	219.7	217.8
Spain | Net Sales by External Customers
Net sales and long-lived assets
Net sales									199.4	204.4	149.7
Austria | Net sales by Geography
Net sales and long-lived assets
Net sales									86.1	92.8	93.1
United Kingdom
Net sales and long-lived assets
Consolidated long-lived assets	151.6				130.8				151.6	130.8	133.4
United Kingdom | Net sales by Geography
Net sales and long-lived assets
Net sales									160.4	154.2	125.1
United Kingdom | Net Sales by External Customers
Net sales and long-lived assets
Net sales									80.1	95.5	84.2
Other
Net sales and long-lived assets
Consolidated long-lived assets	$ 94.6				$ 79.8				94.6	79.8	69.3
Other | Net sales by Geography
Net sales and long-lived assets
Net sales									60.8	75.1	66
Other | Net Sales by External Customers
Net sales and long-lived assets
Net sales									$ 508	$ 507	$ 473.2

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details) $ in Millions	Jan. 05, 2016USD ($)	Dec. 31, 2017USD ($)Business	Dec. 31, 2016USD ($)	Dec. 31, 2014USD ($)
Business Acquisition [Line Items]
Number of businesses acquired | Business		2
Business acquisition cash paid		$ 64.1
Contingent consideration liability		2.9
Goodwill		$ 110.1
Debt instrument, interest rate		4.70%
Luminati | 8% convertible secured promissory note
Business Acquisition [Line Items]
Debt instrument, interest rate			8.00%
Face value			$ 10
Debt instrument, maturity year			2,023
OPM
Business Acquisition [Line Items]
Business combination returned shares value		$ 20
Purchase price			$ 15
Structil SA and Aerospace and OPM
Business Acquisition [Line Items]
Goodwill		38
Recognized intangiable assets and liabilities		$ 32
Formax
Business Acquisition [Line Items]
Business acquisition cash paid	$ 9
Goodwill	10.2
Purchase price	$ 12			$ 22
Percentage of ownership interest acquired	50.00%			50.00%
Remaining installments payment period	4 years
Long-term debt assumed				$ 8.2

Non-Operating Expense - Additio

Non-Operating Expense - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2016	Dec. 31, 2017
Debt Instrument [Line Items]
Pretax charge on unamortized financing costs of credit facility and deferred expense on related interest rate swaps	$ 0.4
Senior unsecured credit facility- revolving loan due 2021
Debt Instrument [Line Items]
Face value	$ 700	$ 700
Debt instrument, maturity year	2,021

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017USD ($)itemLiability	Dec. 31, 2016USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Number of counterparties, which experienced significant downgrades | item	0
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets		$ 0
Liabilities		0
Fair value measurement with unobservable inputs reconciliation, number of liabilities | Liability	1
Level 3 | OPM Acquisition
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Acquisition of fair value liabilities, contingent consideration	$ 2,900,000
Level 2 | Fair Value Measured on Recurring Basis
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	16,700,000	12,000,000
Derivative liabilities	3,300,000	$ 34,300,000
Level 2 | Fair Value Measured on Recurring Basis | Interest Rate Swap Agreements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	800,000
Derivative liabilities	$ 400,000
Derivative assets and liabilities measurement valuation	Interest rate swap — valued using LIBOR yield curves at the reporting date.
Level 2 | Fair Value Measured on Recurring Basis | Foreign Currency Forward Exchange Contracts
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative assets	$ 16,000,000
Derivative liabilities	$ 2,900,000
Derivative assets and liabilities measurement valuation	Foreign exchange derivative assets and liabilities — valued using quoted forward foreign exchange prices at the reporting date.

Quarterly Financial and Marke98

Quarterly Financial and Market Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Quarterly Financial Information [Line Items]
Net sales	$ 511.7	$ 491.5	$ 491.3	$ 478.8	$ 483.5	$ 500.5	$ 522.6	$ 497.7	$ 1,973.3	$ 2,004.3	$ 1,861.2
Gross margin	142.2	135.6	139.9	134.1	135.6	135.7	150.3	143	551.8	564.6	532.8
Operating income	93.2	89.1	89.7	78.6	87	89.1	100.1	83.9	$ 350.6	$ 360.1	$ 332.4
Net income	$ 88.1	$ 69.7	$ 61.6	$ 64.6	$ 59.5	$ 68.2	$ 66.1	$ 56
Net income per common share:
Basic	$ 0.97	$ 0.77	$ 0.68	$ 0.71	$ 0.65	$ 0.74	$ 0.71	$ 0.60
Diluted	0.96	0.76	0.67	0.70	0.64	0.72	0.70	0.59
Maximum
Market price:
Common Stock Value during the Period	63.93	58.24	54.93	55.91	54.97	45.68	46.26	45.40
Minimum
Market price:
Common Stock Value during the Period	$ 57.43	$ 50.50	$ 49.20	$ 49.77	$ 42.04	$ 40.82	$ 39.15	$ 38.38

Schedule II Valuation and Qua99

Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts
Changes in valuation allowances and reserves
Balance at beginning of year	$ 0.4	$ 0.3	$ 0.4
Charged to expense/(recovery)	1.5	0.1
Deductions and other	(1.6)		(0.1)
Balance at end of year	0.3	0.4	0.3
Valuation Allowance for Deferred Tax Assets
Changes in valuation allowances and reserves
Balance at beginning of year	58.9	57.8	60.5
Charged to expense/(recovery)	(10.6)	9.3	3.5
Deductions and other	6.6	(8.2)	(6.2)
Balance at end of year	$ 54.9	$ 58.9	$ 57.8