Unisys (UIS) 10-K 12 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Jan. 31, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	UIS
Entity Registrant Name	UNISYS CORP
Entity Central Index Key	746,838
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		50,484,040
Entity Public Float			$ 639

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue
Services	$ 2,328.2	$ 2,406.3	$ 2,605.6
Technology	413.6	414.4	409.5
Total revenue	2,741.8	2,820.7	3,015.1
Cost of revenue:
Services	2,102.1	2,092.9	2,306.7
Technology	161.4	169.2	167.5
Total cost of revenue	2,263.5	2,262.1	2,474.2
Selling, general and administrative expenses	426.5	455.6	519.6
Research and development expenses	47.2	55.4	76.4
Total costs and expenses	2,737.2	2,773.1	3,070.2
Operating income (loss)	4.6	47.6	(55.1)
Interest expense	52.8	27.4	11.9
Other income (expense), net	(23.9)	0.3	8.2
Income (loss) before income taxes	(72.1)	20.5	(58.8)
(Benefit) provision for income taxes	(5.5)	57.2	44.4
Consolidated net loss	(66.6)	(36.7)	(103.2)
Net income (loss) attributable to noncontrolling interests	(1.3)	11	6.7
Net loss attributable to Unisys Corporation common shareholders	$ (65.3)	$ (47.7)	$ (109.9)
Loss per common share attributable to Unisys Corporation
Basic (in dollars per share)	$ (1.30)	$ (0.95)	$ (2.20)
Diluted (in dollars per share)	$ (1.30)	$ (0.95)	$ (2.20)

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 Comprehensive Income [Abstract]
Consolidated net loss	$ (66.6)	$ (36.7)	$ (103.2)
Other comprehensive income
Foreign currency translation	117.8	(108.4)	(100.8)
Postretirement adjustments, net of tax of $18.3 in 2017, $(13.3) in 2016 and $18.1 in 2015	265.1	(137.6)	265.7
Total other comprehensive income (loss)	382.9	(246)	164.9
Comprehensive income (loss)	316.3	(282.7)	61.7
Comprehensive income (loss) attributable to noncontrolling interests	(44.6)	27.5	(3.5)
Comprehensive income (loss) attributable to Unisys Corporation	$ 271.7	$ (255.2)	$ 58.2

Consolidated Statements of Com4

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Postretirement adjustments, tax	$ 18.3	$ (13.3)	$ 18.1

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 733.9	$ 370.6
Accounts receivable, net	503.3	505.8
Inventories:
Parts and finished equipment	13.6	14
Work in process and materials	12.5	15
Prepaid expenses and other current assets	126.2	121.9
Total current assets	1,389.5	1,027.3
Properties	898.8	886.6
Less – Accumulated depreciation and amortization	756.3	741.3
Properties, net	142.5	145.3
Outsourcing assets, net	202.3	172.5
Marketable software, net	138.3	137
Prepaid postretirement assets	148.3	33.3
Deferred income taxes	119.9	146.1
Goodwill	180.8	178.6
Restricted cash	30.2	30.5	[1]
Other long-term assets	190.6	151	[1]
Total assets	2,542.4	2,021.6
Current liabilities:
Current maturities of long-term debt	10.8	106
Accounts payable	241.8	189
Deferred revenue	327.5	337.4
Other accrued liabilities	391.5	349.2
Total current liabilities	971.6	981.6
Long-term debt	633.9	194
Long-term postretirement liabilities	2,004.4	2,292.6
Long-term deferred revenue	159	117.6
Other long-term liabilities	100	83.2
Commitments and contingencies
Deficit:
Common stock, par value $.01 per share (150.0 million shares authorized; 53.4 million shares and 52.8 million shares issued)	0.5	0.5
Accumulated deficit	(1,963.1)	(1,893.4)
Treasury stock, at cost	(102.7)	(100.5)
Paid-in capital	4,526.4	4,515.2
Accumulated other comprehensive loss	(3,815.8)	(4,152.8)
Total Unisys stockholders’ deficit	(1,354.7)	(1,631)
Noncontrolling interests	28.2	(16.4)
Total deficit	(1,326.5)	(1,647.4)
Total liabilities and deficit	$ 2,542.4	$ 2,021.6
[1]	Amounts were changed to conform to the current-year presentation. See Note 5

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	100,000,000
Common stock, shares issued (in shares)	53,400,000	52,800,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Cash flows from operating activities
Consolidated net loss		$ (66,600,000)	$ (36,700,000)		$ (103,200,000)
Adjustments to reconcile consolidated net loss to net cash provided by operating activities:
Foreign currency transaction losses		21,700,000	400,000		8,400,000
Non-cash interest expense		9,500,000	7,000,000		0
Loss on debt extinguishment		1,500,000	4,000,000		0
Employee stock compensation		11,200,000	9,500,000		9,400,000
Depreciation and amortization of properties		39,700,000	38,900,000		57,500,000
Depreciation and amortization of outsourcing assets		53,700,000	51,900,000		55,700,000
Amortization of marketable software		63,100,000	64,800,000		66,900,000
Other non-cash operating activities		3,200,000	1,900,000		4,600,000
Loss on disposal of capital assets		5,000,000	6,200,000		9,700,000
Pension contributions		(138,400,000)	(132,500,000)		(148,300,000)
Pension expense		92,400,000	82,700,000		108,700,000
Decrease in deferred income taxes, net		3,400,000	2,700,000		1,200,000
Changes in operating assets and liabilities:
Receivables, net		5,900,000	87,300,000		(11,500,000)
Inventories		4,100,000	15,300,000		(3,700,000)
Other assets		(27,500,000)	16,500,000	[1]	18,100,000	[1]
Accounts payable and other accrued liabilities		48,600,000	7,500,000	[1]	(60,300,000)	[1]
Other liabilities		35,900,000	(9,200,000)		(7,500,000)
Net cash provided by operating activities		166,400,000	218,200,000		5,700,000	[1]
Cash flows from investing activities
Proceeds from investments		4,717,200,000	4,455,900,000		3,831,600,000
Purchases of investments		(4,692,400,000)	(4,490,000,000)		(3,806,200,000)
Capital additions of properties		(25,800,000)	(32,500,000)		(49,600,000)
Capital additions of outsourcing assets		(86,300,000)	(51,300,000)		(102,000,000)
Investment in marketable software		(64,400,000)	(63,300,000)		(62,100,000)
Other		(800,000)	(900,000)	[1]	7,000,000	[1]
Net cash used for investing activities		(152,500,000)	(182,100,000)	[1]	(181,300,000)	[1]
Cash flows from financing activities
Proceeds from issuance of long-term debt		452,900,000	213,500,000		31,800,000
Payments for capped call transactions		0	(27,300,000)		0
Issuance costs relating to long-term debt		(12,100,000)	(7,300,000)		0
Payments of long-term debt		(107,500,000)	(129,800,000)		(10,400,000)
Proceeds from exercise of stock options		0	0		3,700,000
Net (payments) proceeds from short-term borrowings		0	(65,800,000)		65,800,000
Financing fees		(1,100,000)	0		(300,000)
Other		2,300,000	400,000	[1]	800,000	[1]
Net cash provided by (used for) financing activities		329,900,000	(17,100,000)	[1]	89,800,000	[1]
Effect of exchange rate changes on cash, cash equivalents and restricted cash		19,200,000	(14,700,000)	[1]	(47,600,000)	[1]
Increase (decrease) in cash, cash equivalents and restricted cash		363,000,000	4,300,000	[1]	(133,400,000)	[1]
Cash, cash equivalents and restricted cash, beginning of year	[1]	401,100,000	396,800,000		530,200,000
Cash, cash equivalents and restricted cash, end of year		$ 764,100,000	$ 401,100,000	[1]	$ 396,800,000	[1]
[1]	Amounts were changed to conform to the current-year presentation. See Note 5

Consolidated Statements of Defi

Consolidated Statements of Deficit - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ (1,647.4)	$ (1,378.6)	$ (1,452.4)
Consolidated net income (loss)	(66.6)	(36.7)	(103.2)
Stock-based compensation	9	8.8	12.1
Discount on debt issuance		33.6
Capped call on debt issuance		(27.3)
Expenses of convertible notes		(1.2)
Translation adjustments	117.8	(108.4)	(100.8)
Postretirement plans	265.1	(137.6)	265.7
Cumulative effect adjustment - ASU No. 2016-16	(4.4)
Ending Balance	(1,326.5)	(1,647.4)	(1,378.6)
Total Unisys Corporation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(1,631)	(1,389.7)	(1,460)
Consolidated net income (loss)	(65.3)	(47.7)	(109.9)
Stock-based compensation	9	8.8	12.1
Discount on debt issuance		33.6
Capped call on debt issuance		(27.3)
Expenses of convertible notes		(1.2)
Translation adjustments	110.1	(93.3)	(96)
Postretirement plans	226.9	(114.2)	264.1
Cumulative effect adjustment - ASU No. 2016-16	(4.4)
Ending Balance	(1,354.7)	(1,631)	(1,389.7)
Common Stock Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	0.5	0.5	0.5
Ending Balance	0.5	0.5	0.5
Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(1,893.4)	(1,845.7)	(1,735.8)
Consolidated net income (loss)	(65.3)	(47.7)	(109.9)
Cumulative effect adjustment - ASU No. 2016-16	(4.4)
Ending Balance	(1,963.1)	(1,893.4)	(1,845.7)
Treasury Stock At Cost
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(100.5)	(100.1)	(99.6)
Stock-based compensation	(2.2)	(0.4)	(0.5)
Ending Balance	(102.7)	(100.5)	(100.1)
Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	4,515.2	4,500.9	4,488.3
Stock-based compensation	11.2	9.2	12.6
Discount on debt issuance		33.6
Capped call on debt issuance		(27.3)
Expenses of convertible notes		(1.2)
Ending Balance	4,526.4	4,515.2	4,500.9
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(4,152.8)	(3,945.3)	(4,113.4)
Translation adjustments	110.1	(93.3)	(96)
Postretirement plans	226.9	(114.2)	264.1
Ending Balance	(3,815.8)	(4,152.8)	(3,945.3)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(16.4)	11.1	7.6
Consolidated net income (loss)	(1.3)	11	6.7
Translation adjustments	7.7	(15.1)	(4.8)
Postretirement plans	38.2	(23.4)	1.6
Ending Balance	$ 28.2	$ (16.4)	$ 11.1

Summary of significant accounti

Summary of significant accounting policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of significant accounting policies	Summary of significant accounting policies Principles of consolidation The consolidated financial statements include the accounts of all majority-owned subsidiaries. Use of estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions about future events. These estimates and assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and the reported amounts of revenue and expenses. Such estimates include the valuation of accounts receivable, inventories, outsourcing assets, marketable software, goodwill and other long-lived assets, legal contingencies, indemnifications, assumptions used in the measurement of progress toward completion for systems integration projects, income taxes and retirement and other post-employment benefits, among others. These estimates and assumptions are based on management’s best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods. Cash and Cash equivalents Cash and cash equivalents consists of cash on hand, short-term investments purchased with a maturity of three months or less and certificates of deposit which may be withdrawn at any time at the discretion of the company without penalty. Cash and cash equivalents subject to contractual restrictions and not readily available are classified as restricted cash. Restricted cash primarily consists of cash the company is contractually obligated to maintain in accordance with the terms of its U.K. business process outsourcing joint venture agreement. The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets to the total of the amounts shown in the consolidated statements of cash flows. As of December 31, 2017 2016 Cash and cash equivalents $ 733.9 $ 370.6 Restricted cash 30.2 30.5 Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 764.1 $ 401.1 Inventories Inventories are valued at the lower of cost and net realizable value. Cost is determined on the first-in, first-out method. Properties Properties are carried at cost and are depreciated over the estimated lives of such assets using the straight-line method. The estimated lives used, in years, are as follows: buildings, 20 – 50 ; machinery and office equipment, 4 – 7 ; rental equipment, 4 ; and internal-use software, 3 – 10 . Advertising costs All advertising costs are expensed as incurred. The amount charged to expense during 2017 , 2016 and 2015 was $1.6 million , $2.7 million and $4.9 million , respectively. Shipping and handling Costs related to shipping and handling are included in cost of revenue. Goodwill Goodwill arising from the acquisition of an entity represents the excess of the cost of acquisition over the fair value of the acquired identifiable assets, liabilities and contingent liabilities of the entity recognized at the date of acquisition. Goodwill is initially recognized as an asset and is subsequently measured at cost less any accumulated impairment losses. Goodwill is held in the currency of the acquired entity and revalued to the closing rate at each balance sheet date. The company tests goodwill for impairment annually in the fourth quarter using data as of September 30th of that year, as well as whenever there are events or changes in circumstances (triggering events) that would more likely than not reduce the fair value of one or more reporting units below its respective carrying amount. The company compares the fair value of each of its reporting units to their respective carrying value. If the carrying value exceeds fair value, an impairment charge is recognized for the difference. Impaired goodwill is written down to its fair value through a charge to the consolidated statement of income in the period the impairment is identified. We estimate the fair value of each reporting unit using a combination of the income approach and market approach. The income approach incorporates the use of a discounted cash flow method in which the estimated future cash flows and terminal values for each reporting unit are discounted to present value. Cash flow projections are based on management’s estimates of economic and market conditions, which drive key assumptions of revenue growth rates, operating margins, capital expenditures and working capital requirements. The discount rate in turn is based on various market factors and specific risk characteristics of each reporting unit. The market approach estimates fair value by applying performance metric multiples to the reporting unit’s prior and expected operating performance. The multiples are derived from comparable publicly traded companies with similar operating and investment characteristics as the reporting unit. If the fair value of the reporting unit derived using the income approach is significantly different from the fair value estimate using the market approach, the company reevaluates its assumptions used in the two models. When considering the weighting between the market approach and income approach, we gave more weighting to the income approach. The higher weighting assigned to the income approach took into consideration that the guideline companies used in the market approach generally represent larger diversified companies relative to the reporting units and may have different long term growth prospects, among other factors. In order to assess the reasonableness of the calculated reporting unit fair values, the company also compares the sum of the reporting units’ fair values to its market capitalization (per share stock price multiplied by shares outstanding) and calculates an implied control premium (the excess of the sum of the reporting units’ fair values over the market capitalization). Estimating the fair value of reporting units requires the use of estimates and significant judgments that are based on a number of factors including actual operating results. It is reasonably possible that the judgments and estimates described above could change in future periods. Revenue recognition Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the fee is fixed or determinable, and collectability is probable. Revenue from hardware sales with standard payment terms is recognized upon the passage of title and the transfer of risk of loss. Outside the United States, the company recognizes revenue even if it retains a form of title to products delivered to customers, provided the sole purpose is to enable the company to recover the products in the event of customer payment default and the arrangement does not prohibit the customer’s use of the product in the ordinary course of business. Revenue from software licenses with standard payment terms is recognized at the inception of the initial license term and upon execution of an extension to the license term. The company also enters into multiple-element arrangements, which may include any combination of software, hardware, or services. For example, a client may purchase an enterprise server that includes operating system software. In addition, the arrangement may include post-contract support for the software and a contract for post-warranty maintenance for service of the hardware. These arrangements consist of multiple deliverables, with software and hardware delivered in one reporting period and the software support and hardware maintenance services delivered across multiple reporting periods. In another example, the company may provide desktop managed services to a client on a long term multiple year basis and periodically sell software and hardware products to the client. The services are provided on a continuous basis across multiple reporting periods and the software and hardware products are delivered in one reporting period. To the extent that a deliverable in a multiple-deliverable arrangement is subject to specific guidance, that deliverable is accounted for in accordance with such specific guidance. Examples of such arrangements may include leased hardware which is subject to specific leasing guidance or software which is subject to specific software revenue recognition guidance. In these transactions, the company allocates the total revenue to be earned under the arrangement among the various elements based on a selling price hierarchy. The selling price for a deliverable is based on its vendor specific objective evidence (“VSOE”) if available, third party evidence (“TPE”) if VSOE is not available, or the best estimated selling price (“ESP”) if neither VSOE nor TPE is available. VSOE of selling price is based upon the normal pricing and discounting practices for those services and products when sold separately. TPE of selling price is based on evaluating largely similar and interchangeable competitor products or services in standalone sales to similarly situated customers. ESP is established considering factors such as margin objectives, discounts off of list prices, market conditions, competition and other factors. ESP represents the price at which the company would transact for the deliverable if it were sold by the company regularly on a standalone basis. As mentioned above, some of the company’s multiple-element arrangements may include leased hardware which is subject to specific leasing guidance. Revenue under these arrangements is allocated considering the relative selling prices of the lease and non-lease elements. Lease deliverables include hardware, financing, maintenance and other executory costs, while non-lease deliverables generally consist of services other than maintenance. The determination of the amount of revenue allocated to the lease deliverables begins by allocating revenue to maintenance and other executory costs plus a profit thereon. These elements are generally recognized over the term of the lease. The remaining amounts are allocated to the hardware and financing elements. The amount allocated to hardware is recognized as revenue monthly over the term of the lease for those leases which are classified as operating leases and at the inception of the lease term for those leases which are classified as sales-type leases. The amount of finance income attributable to sales-type leases is recognized on the accrual basis using the effective interest method. For multiple-element arrangements that involve the licensing, selling or leasing of software, for software and software-related elements, the allocation of revenue is based on VSOE. There may be cases in which there is VSOE of fair value of the undelivered elements but no such evidence for the delivered elements. In these cases, the residual method is used to allocate the arrangement consideration. Under the residual method, the amount of consideration allocated to the delivered elements equals the total arrangement consideration less the aggregate VSOE of fair value of the undelivered elements. For multiple-element arrangements that include services or products that (a) do not include the licensing, selling or leasing of software, or (b) contain software that is incidental to the services or products as a whole or (c) contain software components that are sold, licensed or leased with tangible products when the software components and non-software components (i.e., the software and hardware) of the tangible product function together to deliver the tangible product’s essential functionality (e.g., sales of the company’s enterprise-class servers including software and hardware), or some combination of the above, the allocation of revenue is based on the relative selling prices of each of the deliverables in the arrangement based on the selling price hierarchy, discussed above. For multiple-element arrangements that include both software and non-software deliverables, the company allocates arrangement consideration to the software group and to the non-software group based on the relative selling prices of the deliverables in the arrangement based on the selling price hierarchy discussed above. For the software group, arrangement consideration is further allocated using VSOE as described above. The company recognizes revenue on delivered elements only if: (a) any undelivered services or products are not essential to the functionality of the delivered services or products, (b) the company has an enforceable claim to receive the amount due in the event it does not deliver the undelivered services or products, (c) there is evidence of the selling price for each undelivered service or product, and (d) the revenue recognition criteria otherwise have been met for the delivered elements. Otherwise, revenue on delivered elements is recognized as the undelivered elements are delivered. The company evaluates each deliverable in an arrangement to determine whether it represents a separate unit of accounting. A delivered element constitutes a separate unit of accounting when it has standalone value and there is no customer-negotiated refund or return right for the delivered elements. If these criteria are not met, the deliverable is combined with the undelivered elements and the allocation of the arrangement consideration and revenue recognition are determined for the combined unit as a single unit. Revenue from hardware sales and software licenses with extended payment terms is recognized as payments from customers become due (assuming that all other conditions for revenue recognition have been satisfied). Revenue for operating leases is recognized on a monthly basis over the term of the lease and for sales-type leases at the inception of the lease term. Revenue from equipment and software maintenance and post-contract support is recognized on a straight-line basis as earned over the terms of the respective contracts. Cost related to such contracts is recognized as incurred. Revenue and profit under systems integration contracts are recognized either on the percentage-of-completion method of accounting using the cost-to-cost method, or when services have been performed, depending on the nature of the project. For contracts accounted for on the percentage-of-completion basis, revenue and profit recognized in any given accounting period are based on estimates of total projected contract costs. The estimates are continually reevaluated and revised, when necessary, throughout the life of a contract. Any adjustments to revenue and profit resulting from changes in estimates are accounted for in the period of the change in estimate. When estimates indicate that a loss will be incurred on a contract upon completion, a provision for the expected loss is recorded in the period in which the loss becomes evident. Revenue from time and materials service contracts and outsourcing contracts is recognized as the services are provided using either an objective measure of output or on a straight-line basis over the term of the contract. Income taxes Income taxes are based on income before taxes for financial reporting purposes and reflect a current tax liability for the estimated taxes payable in the current-year tax returns and changes in deferred taxes. Deferred tax assets or liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and are measured using enacted tax laws and rates. A valuation allowance is provided on deferred tax assets if it is determined that it is more likely than not that the asset will not be realized. The company recognizes penalties and interest accrued related to income tax liabilities in provision for income taxes in its consolidated statements of income. The Tax Cuts & Jobs Act (“TCJA”) was enacted by the U.S. on December 22, 2017 and introduced a tax on “global intangible low-taxed income” (“GILTI”) effective in 2018. The company will treat GILTI as a period cost when included in U.S. taxable income. Marketable software The cost of development of computer software to be sold or leased, incurred subsequent to establishment of technological feasibility, is capitalized and amortized to cost of sales over the estimated revenue-producing lives of the products, which is generally not in excess of three years following product release. The company performs quarterly reviews to ensure that unamortized costs remain recoverable from future revenue. Internal-use software The company capitalizes certain internal and external costs incurred to acquire or create internal-use software, principally related to software coding, designing system interfaces, and installation and testing of the software. These costs are amortized in accordance with the fixed asset policy described above. Outsourcing assets Costs on outsourcing contracts are generally expensed as incurred. However, certain costs incurred upon initiation of an outsourcing contract (principally initial customer setup) are deferred and expensed over the initial contract life. Fixed assets and software used in connection with outsourcing contracts are capitalized and depreciated over the shorter of the initial contract life or in accordance with the fixed asset policy described above. Recoverability of outsourcing assets is subject to various business risks. Quarterly, the company compares the carrying value of the outsourcing assets with the undiscounted future cash flows expected to be generated by the outsourcing assets to determine if there is impairment. If impaired, the outsourcing assets are reduced to an estimated fair value on a discounted cash flow basis. The company prepares its cash flow estimates based on assumptions that it believes to be reasonable but are also inherently uncertain. Actual future cash flows could differ from these estimates. Translation of foreign currency The local currency is the functional currency for most of the company’s international subsidiaries, and as such, assets and liabilities are translated into U.S. dollars at year-end exchange rates. Income and expense items are translated at average exchange rates during the year. Translation adjustments resulting from changes in exchange rates are reported in other comprehensive income (loss). Exchange gains and losses on intercompany balances are reported in other income (expense), net. For those international subsidiaries operating in highly inflationary economies, the U.S. dollar is the functional currency, and as such, nonmonetary assets and liabilities are translated at historical exchange rates, and monetary assets and liabilities are translated at current exchange rates. Exchange gains and losses arising from translation are included in other income (expense), net. Stock-based compensation plans Stock-based compensation represents the cost related to stock-based awards granted to employees and directors. The company recognizes compensation expense for the fair value of stock options, which have graded vesting, on a straight-line basis over the requisite service period. The company estimates the fair value of stock options using a Black-Scholes valuation model. The expense is recorded in selling, general and administrative expenses. Retirement benefits Accounting rules covering defined benefit pension plans and other postretirement benefits require that amounts recognized in financial statements be determined on an actuarial basis. A significant element in determining the company’s retirement benefits expense or income is the expected long-term rate of return on plan assets. This expected return is an assumption as to the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the projected pension benefit obligation. The company applies this assumed long-term rate of return to a calculated value of plan assets, which recognizes changes in the fair value of plan assets in a systematic manner over four years. This produces the expected return on plan assets that is included in retirement benefits expense or income. The difference between this expected return and the actual return on plan assets is deferred. The net deferral of past asset losses or gains affects the calculated value of plan assets and, ultimately, future retirement benefits expense or income. At December 31 of each year, the company determines the fair value of its retirement benefits plan assets as well as the discount rate to be used to calculate the present value of plan liabilities. The discount rate is an estimate of the interest rate at which the retirement benefits could be effectively settled. In estimating the discount rate, the company looks to rates of return on high-quality, fixed-income investments currently available and expected to be available during the period to maturity of the retirement benefits. The company uses a portfolio of fixed-income securities, which receive at least the second-highest rating given by a recognized ratings agency. Fair value measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining fair value measurements for assets and liabilities required to be recorded at fair value, the company assumes that the transaction is an orderly transaction that assumes exposure to the market for a period before the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction (for example, a forced liquidation or distress sale). The fair value hierarchy has three levels of inputs that may be used to measure fair value: Level 1 – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the company can access at the measurement date; Level 2 – Inputs other than quoted prices within Level 1 that are observable for the asset or liability, either directly or indirectly; and Level 3 – Unobservable inputs for the asset or liability. The company has applied fair value measurements to its long-term debt (see note 9), derivatives (see note 12) and to its postretirement plan assets (see note 16). Noncontrolling interest The company owns a fifty-one percent interest in Intelligent Processing Solutions Ltd. (“iPSL”), a U.K. business process outsourcing joint venture. The remaining interests, which are reflected as a noncontrolling interest in the company’s financial statements, are owned by three financial institutions for which iPSL performs services.

Earnings per common share

Earnings per common share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings per common share	Earnings per common share The following table shows how the loss per common share attributable to Unisys Corporation was computed for the three years ended December 31, 2017 (shares in thousands). Year ended December 31, 2017 2016 2015 Basic earnings (loss) per common share computation: Net loss attributable to Unisys Corporation common shareholders $ (65.3 ) $ (47.7 ) $ (109.9 ) Weighted average shares 50,409 50,060 49,905 Basic loss per common share $ (1.30 ) $ (0.95 ) $ (2.20 ) Diluted earnings (loss) per common share computation: Net loss attributable to Unisys Corporation for diluted earnings per share $ (65.3 ) $ (47.7 ) $ (109.9 ) Weighted average shares 50,409 50,060 49,905 Diluted loss per common share $ (1.30 ) $ (0.95 ) $ (2.20 ) Anti-dilutive weighted-average stock options and restricted stock units (a) 2,206 3,553 2,915 Anti-dilutive weighted-average common shares issuable upon conversion of the 5.50% convertible senior notes (a) 21,868 17,230 — (a) Amounts represent shares excluded from the computation of diluted earnings per share, as their effect, if included, would have been anti-dilutive for the periods presented.

Cost reduction actions

Cost reduction actions	12 Months Ended
	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Cost reduction actions	Cost reduction actions In 2015, the company initiated a restructuring plan in connection with organizational initiatives to create a more competitive cost structure and rebalance the company’s global skill set. The company recognized charges and other costs of $347.4 million through 2017 in connection with this plan, principally related to a reduction in employees. During 2015 , the company recognized charges of $118.5 million in connection with this plan, principally related to a reduction in employees. The charges related to work-force reductions were $78.8 million and were comprised of: (a) a charge of $27.9 million for 700 employees in the U.S. and (b) a charge of $50.9 million for 782 employees outside the U.S. In addition, the company recorded charges of $39.7 million comprised of $20.2 million for asset impairments and $19.5 million for other expenses related to the cost reduction effort. The charges were recorded in the following statement of income classifications: cost of revenue - services, $52.3 million ; cost of revenue - technology, $0.3 million ; selling, general and administrative expenses, $53.5 million ; and research and development expenses, $12.4 million . During 2016 , the company recognized charges of $82.1 million in connection with this plan, principally related to a reduction in employees. The charges related to work-force reductions were $62.6 million , principally related to severance costs, and were comprised of: (a) a charge of $8.3 million for 351 employees and $(1.3) million for changes in estimates in the U.S. and (b) a charge of $58.6 million for 1,048 employees and $(3.0) million for changes in estimates outside the U.S. In addition, the company recorded charges of $19.5 million comprised of $1.4 million for idle leased facilities costs, $4.1 million for contract amendment and termination costs, $13.3 million for professional fees and other expenses related to the cost reduction effort and $0.7 million for net asset sales and write-offs. The charges were recorded in the following statement of income classifications: cost of revenue – services, $42.4 million ; selling, general and administrative expenses, $38.0 million ; and research and development expenses, $1.7 million . During 2017 , the company recognized charges of $146.8 million in connection with this plan. The charges related to work-force reductions were $117.9 million , principally related to severance costs, and were comprised of: (a) a charge of $9.4 million for 542 employees and $(1.3) million for changes in estimates in the U.S. and (b) a charge of $109.4 million for 2,274 employees, $8.2 million for additional benefits provided in 2017 and $(7.8) million for changes in estimates outside the U.S. In addition, the company recorded charges of $28.9 million comprised of $4.7 million for idle leased facilities costs, $5.4 million for contract amendment and termination costs, $5.2 million for professional fees and other expenses related to the cost reduction effort, $1.8 million for net asset sales and write-offs and $11.8 million for net foreign currency losses related to exiting foreign countries. The charges were recorded in the following statement of income classifications: cost of revenue - services, $99.6 million ; cost of revenue - technology, $0.4 million ; selling, general and administrative expenses, $33.6 million ; and research and development expenses, $1.4 million ; and other income (expense), net, $11.8 million . Liabilities and expected future payments related to these costs are as follows: Work-Force Reductions Idle Leased Total U.S. International Facilities Costs Charges for work-force reductions $ 78.8 $ 27.9 $ 50.9 $ — Payments (45.3 ) (23.7 ) (21.6 ) — Translation adjustments (0.5 ) (0.5 ) — Balance at December 31, 2015 33.0 4.2 28.8 — Additional Provisions 68.3 8.3 58.6 1.4 Payments (59.3 ) (9.4 ) (49.9 ) — Changes in estimates (4.3 ) (1.3 ) (3.0 ) — Translation adjustments (1.1 ) — (1.1 ) — Balance at December 31, 2016 36.6 1.8 33.4 1.4 Additional Provisions 131.2 9.4 117.6 4.2 Payments (49.3 ) (6.0 ) (41.3 ) (2.0 ) Changes in estimates (8.6 ) (1.3 ) (7.8 ) 0.5 Translation adjustments 7.9 — 7.7 0.2 Balance at December 31, 2017 $ 117.8 $ 3.9 $ 109.6 $ 4.3 Expected future payments on balance at December 31, 2017 In 2018 $ 87.7 $ 3.9 $ 82.0 $ 1.8 Beyond 2018 30.1 — 27.6 2.5

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill During the fourth quarter of 2017 , the company performed its annual impairment test of goodwill for all of our reporting units. The fair values of each of the reporting units exceeded their carrying values; therefore, no goodwill impairment was required. At December 31, 2017 , the amount of goodwill allocated to reporting units with negative net assets was as follows: Business Process Outsourcing Services, $10.8 . Changes in the carrying amount of goodwill by segment for the years ended December 31, 2017 and 2016 were as follows: Total Services Technology Balance at December 31, 2015 $ 177.4 $ 68.7 $ 108.7 Translation adjustments 1.2 1.2 — Balance at December 31, 2016 178.6 69.9 108.7 Translation adjustments 2.2 2.2 — Balance at December 31, 2017 $ 180.8 $ 72.1 $ 108.7

Recent accounting pronouncement

Recent accounting pronouncements and accounting changes	12 Months Ended
	Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Recent accounting pronouncements and accounting changes	Recent accounting pronouncements and accounting changes Accounting Pronouncements Adopted Effective January 1, 2017, the company adopted Accounting Standards Update (“ASU”) No. 2017-04 Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment issued by the Financial Accounting Standards Board (“FASB”) which simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. Under the amended guidance, an entity will perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge will be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value. Adoption of this new guidance had no impact on the company’s consolidated results of operations and financial position. Effective January 1, 2017, the company adopted ASU No. 2016-18 Statement of Cash Flows (Topic 230) - Restricted Cash issued by the FASB which requires companies to include amounts generally described as restricted cash or restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The new guidance has been applied on retrospective basis whereby prior-period financial statements have been adjusted to reflect the application of the new guidance, as required by the FASB. Amounts reclassified in the consolidated statements of cash flows for the years ended December 31, 2016 and 2015 are as follows: Year ended December 31, 2016 2015 Cash flows from operating activities Other assets $ (1.9 ) 2.60 $ 2.6 Cash flows from investing activities Other 1.6 (2.3 ) Effect of exchange rate changes on cash, cash equivalents and restricted cash (0.8 ) (4.6 ) Cash, cash equivalents and restricted cash, beginning of year 31.6 35.9 Cash, cash equivalents and restricted cash, end of year 30.5 31.6 Effective January 1, 2017, the company adopted ASU No. 2016-16 Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory issued by the FASB which allows the recognition of deferred income taxes for an intra-entity asset transfer, other than inventory, when the transfer occurs. Historically, recognition of the income tax consequence was not recognized until the asset was sold to an outside party. The new guidance has been applied on a modified retrospective basis through a cumulative-effect adjustment directly to accumulated deficit. At January 1, 2017, the adjustment to accumulated deficit was an increase of $4.4 million . Effective January 1, 2017, the company adopted ASU No. 2016-15 Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force) , issued by the FASB which clarifies the treatment of several cash flow categories. In addition, the guidance also clarifies that when cash receipts and cash payments have aspects of more than one class of cash flows and cannot be separated, classification will depend on the predominant source or use. The company previously reported premium payments on and proceeds from the settlement of corporate-owned life insurance policies as cash flows from operating activities in the company’s consolidated statement of cash flows. Under the new guidance, these amounts were reclassified to investing activities. The new guidance has been applied on a retrospective basis whereby prior-period financial statements have been adjusted to reflect the application of the new guidance, as required by the FASB. For the years ended December 31, 2016 and 2015, $1.5 million and $1.1 million , respectively, were reclassified from “other assets” in operating activities to “other” in investing activities in the company’s consolidated statements of cash flows. Effective January 1, 2017, the company adopted ASU No. 2016-09 Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting , issued by the FASB, which changes certain aspects of accounting for share-based payments to employees. The new guidance requires all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also allows an employer to repurchase more of an employee’s shares than it can today for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. Additionally, the standard requires all tax-related cash flows resulting from share-based payments to be reported as operating activities on the consolidated statement of cash flows, and any cash payments made to taxing authorities on an employee’s behalf as financing activities, which the company previously reported as operating activities. The new guidance has been applied on a retrospective basis whereby prior-period financial statements have been adjusted to reflect the application of the new guidance, as required by the FASB. For the years ended December 31, 2016 and 2015, $0.4 million and $0.8 million , respectively, were reclassified from “accounts payable and other accrued liabilities” in operating activities to “other” in financing activities in the company’s consolidated statements of cash flows. Accounting Pronouncements Not Yet Adopted In March 2017, the FASB issued ASU No. 2017-07 Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost , which requires employers to present the service cost component of net periodic benefit cost in the same income statement line item(s) as other employee compensation costs arising from services rendered during the period. Only the service cost component will be eligible for capitalization in assets. The other components of net periodic benefit cost will be presented separately from the line items that include service cost and outside the subtotal of operating income. This update is effective for annual periods beginning after December 15, 2017, which for the company is January 1, 2018. Adoption of this new guidance will result in the reclassification of net periodic benefit cost, other than service costs ( $92.5 million and $81.6 million for the years ended December 31, 2017 and 2016, respectively), from operating income to non-operating income. There will be no overall impact on the company’s consolidated financial position. In June 2016, the FASB issued ASU No. 2016-13 Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , which introduces a new model for recognizing credit losses on financial instruments based on an estimate of current expected losses. This includes trade and other receivables, loans and other financial instruments. This update is effective for annual periods beginning after December 15, 2019, with earlier adoption permitted. The company is currently assessing when it will choose to adopt, and is currently evaluating the impact of the adoption on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02 Leases (Topic 842) , which is intended to improve financial reporting about leasing transactions. The ASU requires organizations that lease assets, referred to as lessees, to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. The standard requires disclosures to help investors and other financial statement users better understand the amount, timing and uncertainty of cash flows arising from leases. The standard is effective for annual reporting periods beginning after December 15, 2018, with earlier adoption permitted. The company will adopt the new guidance on January 1, 2019, and is currently evaluating the impact of the adoption on its consolidated results of operations and financial position. In May 2014, the FASB issued ASU No. 2014-09 Revenue from Contracts with Customers (Topic 606) , which establishes principles that an entity shall apply to report useful information to users of financial statements about the nature, amount, timing and uncertainty of revenue and cash flows from a contract with a customer. The standard, and its various amendments, is effective for annual reporting periods beginning after December 15, 2017, which for the company is January 1, 2018. The standard allows for either “full retrospective” adoption, meaning the standard is applied to all periods presented, or “modified retrospective” adoption, meaning the standard is applied only to the most current period presented in the financial statements. The new standard would require the company to recognize revenue for certain transactions, including extended payment term software licenses and short-term software licenses, sooner than the current rules would allow and require the company to recognize software license extensions and renewals (the most significant impact upon adoption), later than the current rules would allow. The standard also requires significantly expanded disclosure requirements. The company will adopt the standard on January 1, 2018 using the modified retrospective method. The company does not believe there will be a material impact to its consolidated financial position upon adoption.

Accounts receivable

Accounts receivable	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Accounts receivable	Accounts receivable Accounts receivable consist principally of trade accounts receivable from customers and are generally unsecured and due within 30 to 90 days. Credit losses relating to these receivables consistently have been within management’s expectations. Expected credit losses are recorded as an allowance for doubtful accounts in the consolidated balance sheets. Estimates of expected credit losses are based primarily on the aging of the accounts receivable balances. The company records a specific reserve for individual accounts when it becomes aware of a customer’s inability to meet its financial obligations, such as in the case of bankruptcy filings or deterioration in the customer’s operating results or financial position. The collection policies and procedures of the company vary by credit class and prior payment history of customers. Revenue recognized in excess of billings on services contracts, or unbilled accounts receivable, was $109.4 million and $98.0 million at December 31, 2017 and 2016 , respectively. As of December 31, 2017 , receivables under sales-type leases before the allowance for unearned income were collectible as follows: Year 2018 $ 45.5 2019 25.8 2020 16.3 2021 10.8 2022 9.7 Thereafter 19.1 Total $ 127.2 Unearned income, which is deducted from accounts receivable, was $12.5 million and $7.0 million at December 31, 2017 and 2016 , respectively. The allowance for doubtful accounts, which is reported as a deduction from accounts receivable, was $22.0 million and $22.8 million at December 31, 2017 and 2016 , respectively. The provision for doubtful accounts, which is reported in selling, general and administrative expenses in the consolidated statements of income, was expense of $3.1 million , $2.2 million and $3.0 million , in 2017 , 2016 and 2015 , respectively.

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income taxes	Income taxes Following is the total income (loss) before income taxes and the provision for income taxes for the three years ended December 31, 2017 . Year ended December 31, 2017 2016 2015 Income (loss) before income taxes United States $ (152.7 ) $ (88.3 ) $ (130.6 ) Foreign 80.6 108.8 71.8 Total income (loss) before income taxes $ (72.1 ) $ 20.5 $ (58.8 ) Provision for income taxes Current United States $ (42.8 ) $ 6.7 $ 1.0 Foreign 33.9 47.7 42.2 State and local — — 0.3 Total (8.9 ) 54.4 43.5 Deferred Foreign 3.4 2.8 0.9 Total (benefit) provision for income taxes $ (5.5 ) $ 57.2 $ 44.4 Following is a reconciliation of the (benefit) provision for income taxes at the United States statutory tax rate to the provision for income taxes as reported: Year ended December 31, 2017 2016 2015 United States statutory income tax provision (benefit) $ (25.2 ) $ 7.2 $ (20.6 ) Income and losses for which no provision or benefit has been recognized 70.3 65.5 69.1 Foreign rate differential and other foreign tax expense (11.3 ) (21.1 ) (15.9 ) Income tax withholdings 16.8 22.8 12.5 Permanent items (3.0 ) (4.7 ) (1.9 ) Enacted rate changes (0.4 ) 3.5 9.1 Change in uncertain tax positions 2.3 0.4 1.5 Change in valuation allowances due to changes in judgment (4.6 ) (16.4 ) (5.4 ) Income tax credits, U.S. (50.4 ) — (4.0 ) (Benefit) provision for income taxes $ (5.5 ) $ 57.2 $ 44.4 The TCJA was enacted by the U.S. on December 22, 2017. The TCJA eliminates the corporate Alternative Minimum Tax (“AMT”) beginning in 2018, and also provides for refunds of all remaining AMT credits. Consequently, the company recorded a benefit of $50.4 million in 2017. Of this total, $9.1 million was received in 2017, and approximately $7.2 million will be received in 2018 under Internal Revenue Code section 168(k)(4) of the prior tax law. The remainder, $34.1 million , will be refundable under the TCJA between 2019 and 2022. The 2016 and 2015 provision for income taxes included $3.5 million and $9.1 million due to a reduction in the UK income tax rate. The rate reductions were enacted in the third quarter of 2016 and the fourth quarter of 2015 and reduced the rate from 18% to 17% and from 20% to 18% effective April 1, 2020 and 2017, respectively. The tax effects of temporary differences and carryforwards that give rise to significant portions of deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows: As of December 31, 2017 2016 Deferred tax assets Tax loss carryforwards $ 837.6 $ 889.6 Postretirement benefits 437.7 728.9 Foreign tax credit carryforwards 127.0 317.6 Other tax credit carryforwards 29.1 91.4 Deferred revenue 40.9 81.0 Employee benefits and compensation 35.2 49.1 Purchased capitalized software 22.2 32.6 Depreciation 24.5 28.3 Warranty, bad debts and other reserves 5.3 16.1 Capitalized costs 3.1 10.9 Other 39.3 27.7 1,601.9 2,273.2 Valuation allowance (1,441.1 ) (2,084.6 ) Total deferred tax assets $ 160.8 $ 188.6 Deferred tax liabilities Capitalized research and development $ 24.3 $ 20.3 Other 25.8 28.4 Total deferred tax liabilities $ 50.1 $ 48.7 Net deferred tax assets $ 110.7 $ 139.9 The TCJA reduced the U.S. federal tax rate from 35% to 21% effective in 2018. This rate decrease resulted in a remeasurement of U.S. deferred tax balances in 2017, with no net financial statement impact due to the valuation allowance recorded against all U.S. deferred tax assets. At December 31, 2017 , the company has tax effected U.S. Federal ( $319.5 million ), state and local ( $250.7 million ), and foreign ( $267.4 million ) tax loss carryforwards, the total of which is $837.6 million . These carryforwards will expire as follows: 2018 , $5.3 ; 2019 , $7.3 ; 2020 , $28.5 ; 2021 , $14.5 ; 2022 , $114.0 ; and $668.0 thereafter. The company also has available tax credit carryforwards of $127.0 million , which will expire as follows: 2018 , $10.1 ; 2019 , $10.2 ; 2020 , $20.9 ; 2021 , $8.7 ; 2022 , $7.7 ; and $69.4 thereafter. Failure to achieve forecasted taxable income might affect the ultimate realization of the company’s net deferred tax assets. Factors that may affect the company’s ability to achieve sufficient forecasted taxable income include, but are not limited to, the following: increased competition, a decline in sales or margins, loss of market share, the impact of the economic environment, delays in product availability and technological obsolescence. Under U.S. tax law effective through December 31, 2017, undistributed earnings of foreign subsidiaries were generally taxable upon repatriation to the U.S. shareholder. Under the TCJA, effective January 1, 2018, distributions from foreign subsidiaries to U.S. shareholders are generally exempt from taxation. As a part of the transition to this new participation exemption system of taxation, the TCJA requires a transition tax to be paid on the net accumulated post-1986 undistributed earnings of foreign subsidiaries. The company has determined that, due to accumulated deficits of foreign subsidiaries offsetting the accumulated earnings of foreign subsidiaries, the company will not incur a transition tax. With this change in U.S. taxation of earnings of foreign subsidiaries under the TCJA, future distributions of earnings from foreign subsidiaries will generally be exempt from U.S. taxation. Consequently, the deferred income tax liability on undistributed earnings is generally limited to any foreign withholding or other foreign taxes that will be imposed on such distributions. As the company currently intends to indefinitely reinvest the earnings of certain foreign subsidiaries, no provision has been made for income taxes that may become payable upon distribution of the earnings of such subsidiaries. The unrecognized deferred income tax liability at December 31, 2017 approximated $21.5 million . While subsequent to 2017, the U.S. will not generally tax distributions from foreign subsidiaries, the TCJA introduced a tax on GILTI. Beginning in 2018, U.S. taxable income will include GILTI, which essentially includes net foreign subsidiaries’ earnings above a routine 10% return on their aggregate specified tangible assets. The company has made an accounting policy election to treat the GILTI as a period cost when included in U.S. taxable income, and consequently GILTI has no impact on the 2017 financial statements. Cash paid for income taxes, net of refunds, during 2017 , 2016 and 2015 was $34.3 million , $46.4 million and $59.7 million , respectively. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: Year ended December 31, 2017 2016 2015 Balance at January 1 $ 35.8 $ 27.7 $ 35.0 Additions based on tax positions related to the current year 4.2 2.7 3.4 Changes for tax positions of prior years (11.2 ) 12.0 (4.0 ) Reductions as a result of a lapse of applicable statute of limitations (2.7 ) (2.8 ) (3.4 ) Settlements (0.2 ) (0.1 ) (0.9 ) Changes due to foreign currency 2.0 (3.7 ) (2.4 ) Balance at December 31 $ 27.9 $ 35.8 $ 27.7 The company recognizes penalties and interest accrued related to income tax liabilities in the provision for income taxes in its consolidated statements of income. At December 31, 2017 and 2016 , the company had an accrual of $2.3 million and $1.2 million , respectively, for the payment of penalties and interest. At December 31, 2017 , all of the company’s liability for unrecognized tax benefits, if recognized, would affect the company’s effective tax rate. Within the next 12 months , the company believes that it is reasonably possible that the amount of unrecognized tax benefits may significantly change; however, various events could cause this belief to change in the future. The company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, and various states and foreign jurisdictions. Several U.S. state and foreign income tax audits are in process. The company is under an audit in India, for which years prior to 2006 are closed. For the most significant jurisdictions outside the U.S., the audit periods through 2012 are closed for Brazil, and the audit periods through 2013 are closed for the United Kingdom. All of the various ongoing income tax audits throughout the world are not expected to have a material impact on the company’s financial position. Internal Revenue Code Sections 382 and 383 provide annual limitations with respect to the ability of a corporation to utilize its net operating loss (as well as certain built-in losses) and tax credit carryforwards, respectively (“Tax Attributes”), against future U.S. taxable income, if the corporation experiences an “ownership change.” In general terms, an ownership change may result from transactions increasing the ownership of certain stockholders in the stock of a corporation by more than 50 percentage points over a three-year period. The company regularly monitors ownership changes (as calculated for purposes of Section 382). The company has determined that, for purposes of the rules of Section 382 described above, an ownership change occurred in February 2011. Any future transaction or transactions and the timing of such transaction or transactions could trigger additional ownership changes under Section 382. As a result of the February 2011 ownership change, utilization for certain of the company’s Tax Attributes, U.S. net operating losses and tax credits, is subject to an overall annual limitation of $70.6 million . The cumulative limitation as of December 31, 2017 is approximately $416.0 million . This limitation will be applied first to any recognized built in losses, then to any net operating losses, and then to any other Tax Attributes. Any unused limitation may be carried over to later years. Based on presently available information and the existence of tax planning strategies, the company does not expect to incur a U.S. cash tax liability in the near term. The company maintains a full valuation allowance against the realization of all U.S. deferred tax assets as well as certain foreign deferred tax assets in excess of deferred tax liabilities.

Properties

Properties	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Properties	Properties Properties comprise the following: As of December 31, 2017 2016 Land $ 2.8 $ 2.7 Buildings 91.3 88.2 Machinery and office equipment 601.7 591.7 Internal-use software 157.4 145.9 Rental equipment 45.6 58.1 Total properties $ 898.8 $ 886.6

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Debt	Debt Long-term debt is comprised of the following: As of December 31, 2017 2016 10.75% senior secured notes due April 15, 2022 ($440.0 million face value less unamortized discount and fees of $10.4 million at December 31, 2017) $ 429.6 $ — 5.50% convertible senior notes due March 1, 2021 ($213.5 million face value less unamortized discount and fees of $27.2 million and $34.4 million at December 31, 2017 and 2016, respectively) 186.3 179.1 6.25% senior notes — 94.7 Capital leases 7.5 10.1 Other debt 21.3 16.1 Total 644.7 300.0 Less – current maturities 10.8 106.0 Total long-term debt $ 633.9 $ 194.0 Long-term debt is carried at amortized cost and its estimated fair value is based on market prices classified as Level 2 in the fair value hierarchy. Presented below are the estimated fair values of long-term debt as of December 31, 2017 and 2016 . As of December 31, 2017 2016 10.75% senior secured notes due April 15, 2022 (a) $ 492.8 $ — 5.50% convertible senior notes due March 1, 2021 237.9 379.8 6.25% senior notes (b) — 97.8 (a) Issued in April 2017 (b) Retired in April 2017 Maturities of long-term debt, including capital leases, in each of the next five years and thereafter are as follows: Year Total Long-Term Debt Capital Leases 2018 $ 10.8 $ 8.2 $ 2.6 2019 1.4 — 1.4 2020 2.3 0.9 1.4 2021 189.5 188.1 1.4 2022 432.3 431.5 0.8 Thereafter 8.4 8.4 — Total $ 644.7 $ 637.1 $ 7.6 Cash paid for interest during 2017 , 2016 and 2015 was $39.9 million , $22.1 million and $14.4 million , respectively. Capitalized interest expense during 2017 , 2016 and 2015 was $4.2 million , $3.0 million and $3.1 million , respectively. On April 17, 2017, the company issued $440.0 million aggregate principal amount of 10.75% Senior Secured Notes due 2022 (the “Notes”). The Notes are initially fully and unconditionally guaranteed on a senior secured basis by Unisys Holding Corporation, Unisys AP Investment Company I and Unisys NPL, Inc. (together with the Company, the “Grantors”). In the future, the Notes will be guaranteed by each material domestic subsidiary and each restricted subsidiary that guarantees the secured revolving credit facility and other indebtedness of the company or another subsidiary guarantor. The Notes and the guarantees will rank equally in right of payment with all of the existing and future senior debt of the company and the subsidiary guarantors. The Notes and the guarantees will be structurally subordinated to all existing and future liabilities (including preferred stock, trade payables and pension liabilities) of the company’s subsidiaries that are not subsidiary guarantors. The Notes pay interest semiannually on April 15 and October 15, commencing on October 15, 2017, at an annual rate of 10.75% , and will mature on April 15, 2022, unless earlier repurchased or redeemed. The company may, at its option, redeem some or all of the Notes at any time on or after April 15, 2020 at a redemption price determined in accordance with the redemption schedule set forth in the indenture governing the Notes (the “indenture”), plus accrued and unpaid interest, if any. Prior to April 15, 2020, the company may, at its option, redeem some or all of the Notes at any time, at a price equal to 100% of the principal amount of the Notes redeemed plus a “make-whole” premium, plus accrued and unpaid interest, if any. The company may also redeem, at its option, up to 35% of the Notes at any time prior to April 15, 2020, using the proceeds of certain equity offerings at a redemption price of 110.75% of the principal amount thereof, plus accrued and unpaid interest, if any. In addition, the company may redeem all (but not less than all) of the Notes at any time that the Collateral Coverage Ratio is less than the Required Collateral Coverage Ratio (as such terms are described below and further defined in the indenture) at a price equal to 100% of the principal amount of the Notes plus accrued and unpaid interest, if any. The indenture contains covenants that limit the ability of the company and its restricted subsidiaries to, among other things: (i) incur additional indebtedness and guarantee indebtedness; (ii) pay dividends or make other distributions or repurchase or redeem its capital stock; (iii) prepay, redeem or repurchase certain debt; (iv) make certain prepayments in respect of pension obligations; (v) issue certain preferred stock or similar equity securities; (vi) make loans and investments (including investments by the company and subsidiary guarantors in subsidiaries that are not guarantors); (vii) sell assets; (viii) create or incur liens; (ix) enter into transactions with affiliates; (x) enter into agreements restricting its subsidiaries’ ability to pay dividends; and (xi) consolidate, merge or sell all or substantially all of its assets. These covenants are subject to several important limitations and exceptions. The indenture also includes a covenant requiring that the company maintain a Collateral Coverage Ratio of not less than 1.50 : 1.00 (the “Required Collateral Coverage Ratio”) as of any test date. The Collateral Coverage Ratio is based on the ratio of (A) Grantor unrestricted cash and cash equivalents plus 4.75 multiplied by of the greater of (x) Grantor EBITDA for the most recently ended four fiscal quarters and (y) (i) the average quarterly Grantor EBITDA for the most recently ended seven fiscal quarters, multiplied by (ii) four , to (B) secured indebtedness of the Grantors. The Collateral Coverage Ratio is tested quarterly. If the Collateral Coverage Ratio is less than the Required Collateral Coverage Ratio as of any test date, and the company has not redeemed the Notes within 90 days thereafter, this will be an event of default under the indenture. If the company experiences certain kinds of changes of control, it must offer to purchase the Notes at 101% of the principal amount of the Notes, plus accrued and unpaid interest, if any. In addition, if the company sells assets under certain circumstances it must apply the proceeds towards an offer to repurchase the Notes at a price equal to par plus accrued and unpaid interest, if any. The indenture also provides for events of default, which, if any of them occurs, would permit or require the principal, premium, if any, interest and any other monetary obligations on all the then outstanding Notes to be due and payable immediately. On May 8, 2017, the company redeemed all of its then outstanding 6.25% senior notes due 2017. As a result of this redemption, the company recognized a charge of $1.5 million in “Other income (expense), net” in the second quarter of 2017, which is comprised of $1.3 million of premium and expenses paid and $0.2 million for the write-off of unamortized discount and fees related to the portion of the notes redeemed. In 2016, the company issued $213.5 million aggregate principal amount of Convertible Senior Notes due 2021 (the “2021 Notes”). The 2021 Notes, which are senior unsecured obligations, bear interest at a coupon rate of 5.50% (or 9.5% effective interest rate) per year until maturity, payable semiannually in arrears on March 1 and September 1 of each year, beginning on September 1, 2016. The 2021 Notes are not redeemable prior to maturity and are convertible into shares of the company’s common stock. The conversion rate for the 2021 Notes is 102.4249 shares of the company’s common stock per $1,000 principal amount of the 2021 Notes (or a total amount of 21,867,716 shares), which is equivalent to an initial conversion price of approximately $9.76 per share of the company’s common stock. Upon any conversion, the company will settle its conversion obligation in cash, shares of its common stock, or a combination of cash and shares of its common stock, at its election. In connection with the issuance of the 2021 Notes, the company also paid $27.3 million to enter into privately negotiated capped call transactions with the initial purchasers and/or affiliates of the initial purchasers. The capped call transactions will cover, subject to customary anti-dilution adjustments, the number of shares of the company’s common stock that will initially underlie the 2021 Notes. The capped call transactions will effectively raise the conversion premium on the 2021 Notes from approximately 22.5% to approximately 60% , which raises the initial conversion price from approximately $9.76 per share of common stock to approximately $12.75 per share of common stock. The capped call transactions are expected to reduce potential dilution to the company’s common stock and/or offset potential cash payments the company is required to make in excess of the principal amount upon any conversion of the 2021 Notes. Interest expense related to the 2021 Notes (a) is comprised of the following: Year ended December 31, 2017 2016 Contractual interest coupon $ 11.8 $ 9.2 Amortization of debt discount 6.0 4.3 Amortization of debt issuance costs 1.2 1.0 Total $ 19.0 $ 14.5 (a) Issued in 2016 The company has a secured revolving credit facility (the “Credit Agreement”) that provides for loans and letters of credit up to an aggregate amount of $125.0 million (with a limit on letters of credit of $30.0 million ). The Credit Agreement includes an accordion feature allowing for an increase in the amount of the facility up to $150.0 million . Availability under the credit facility is subject to a borrowing base calculated by reference to the company’s receivables. At December 31, 2017 , the company had no borrowings and $4.7 million of letters of credit outstanding, and availability under the facility was $110.5 million net of letters of credit issued. The Credit Agreement expires October 5, 2022, subject to a springing maturity (i) on the date that is 91 days prior to the maturity date of the 2021 Notes unless, on such date, certain conditions are met; or (ii) on the date that is 60 days prior to the maturity date of the Notes unless, by such date, such secured notes have not been redeemed or refinanced. The credit facility is guaranteed by Unisys Holding Corporation, Unisys NPL, Inc., Unisys AP Investment Company I and any future material domestic subsidiaries. The facility is secured by the assets of the company and the subsidiary guarantors, other than certain excluded assets, under a security agreement entered into by the company and the subsidiary guarantors in favor of JPMorgan Chase Bank, N.A., as agent for the lenders under the credit facility. The company is required to maintain a minimum fixed charge coverage ratio if the availability under the credit facility falls below the greater of 10% of the lenders’ commitments under the facility and $15 million . The Credit Agreement contains customary representations and warranties, including that there has been no material adverse change in the company’s business, properties, operations or financial condition. The Credit Agreement includes limitations on the ability of the company and its subsidiaries to, among other things, incur other debt or liens, dispose of assets and make acquisitions, loans and investments, repurchase its equity, and prepay other debt. Events of default include non-payment, failure to comply with covenants, materially incorrect representations and warranties, change of control and default under other debt aggregating at least $50.0 million . At December 31, 2017 , the company has met all covenants and conditions under its various lending agreements. The company expects to continue to meet these covenants and conditions. The company’s principal sources of liquidity are cash on hand, cash from operations and its revolving credit facility, discussed above. The company and certain international subsidiaries have access to uncommitted lines of credit from various banks. The company’s anticipated future cash expenditures include anticipated contributions to its defined benefit pension plans. The company believes that it has adequate sources of liquidity to meet its expected 2018 cash requirements.

Other accrued liabilities

Other accrued liabilities	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Other accrued liabilities	Other accrued liabilities Other accrued liabilities (current) are comprised of the following: As of December 31, 2017 2016 Payrolls and commissions $ 120.2 $ 110.6 Cost reduction 87.7 21.2 Accrued vacations 42.8 47.1 Taxes other than income taxes 29.1 25.4 Income taxes 26.0 35.3 Postretirement 18.5 19.3 Accrued interest 13.8 6.1 Other 53.4 84.2 Total other accrued liabilities $ 391.5 $ 349.2

Rental expense and commitments

Rental expense and commitments	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Rental expense and commitments	Rental expense and commitments Rental expense and income from subleases for the three years ended December 31, 2017 were as follows: Year ended December 31, 2017 2016 2015 Rental expense, less income from subleases $ 71.7 $ 77.4 $ 80.6 Income from subleases $ 4.4 $ 7.8 $ 9.1 Minimum net rental commitments under noncancelable operating leases, including idle leases, outstanding at December 31, 2017 , substantially all of which relate to real properties, were as follows: Year 2018 $ 47.4 2019 41.3 2020 32.9 2021 21.5 2022 16.2 Thereafter 39.4 Total $ 198.7 Such rental commitments have been reduced by minimum sublease rentals of $7.2 million , due in the future under noncancelable subleases. At December 31, 2017 , the company had outstanding standby letters of credit and surety bonds totaling approximately $318 million related to performance and payment guarantees. On the basis of experience with these arrangements, the company believes that any obligations that may arise will not be material. In addition, at December 31, 2017 , the company had deposits and collateral of approximately $14 million in other long-term assets, principally related to tax contingencies in Brazil.

Financial instruments and conce

Financial instruments and concentration of credit risks	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Financial instruments and concentration of credit risks	Financial instruments and concentration of credit risks Due to its foreign operations, the company is exposed to the effects of foreign currency exchange rate fluctuations on the U.S. dollar, principally related to intercompany account balances. The company uses derivative financial instruments to reduce its exposure to market risks from changes in foreign currency exchange rates on such balances. The company enters into foreign exchange forward contracts, generally having maturities of three months or less, which have not been designated as hedging instruments. At December 31, 2017 and 2016 , the notional amount of these contracts was $514.0 million and $428.9 million , respectively. The fair value of these forward contracts is based on quoted prices for similar but not identical financial instruments; as such, the inputs are considered Level 2 inputs. The following table summarizes the fair value of the company’s foreign exchange forward contracts as of December 31, 2017 and 2016 . As of December 31, 2017 2016 Balance Sheet Location Prepaid expenses and other current assets $ 4.9 $ 2.4 Other accrued liabilities 1.6 1.9 Total fair value $ 3.3 0.5 $ 0.5 The following table summarizes the location and amount of gains and losses recognized on foreign exchange forward contracts for the three years ended December 31, 2017 . Year Ended December 31, 2017 2016 2015 Statement of Income Location Other income (expense), net $ 27.5 $ (29.1 ) $ 15.6 Financial instruments also include temporary cash investments and customer accounts receivable. Temporary investments are placed with creditworthy financial institutions, primarily in money market funds, time deposits and certificate of deposits which may be withdrawn at any time at the discretion of the company without penalty. At December 31, 2017 and 2016 , the company’s cash equivalents principally have maturities of less than one month or can be withdrawn at any time at the discretion of the company without penalty. Due to the short maturities of these instruments, they are carried on the consolidated balance sheets at cost plus accrued interest, which approximates market value. Receivables are due from a large number of customers that are dispersed worldwide across many industries. At December 31, 2017 and 2016 , the company had no significant concentrations of credit risk with any one customer. At December 31, 2017 and 2016 , the company had $75.8 million and $74.0 million , respectively, of receivables due from various U.S. federal governmental agencies. At December 31, 2017 and 2016 , the carrying amount of cash and cash equivalents approximated fair value.

Foreign currency

Foreign currency	12 Months Ended
	Dec. 31, 2017
Foreign Currency [Abstract]
Foreign currency	Foreign currency During the years ended December 31, 2017 , 2016 and 2015 , the company recognized foreign exchange gains (losses) in “Other income (expense), net” in its consolidated statements of income of $(9.9) million , $2.3 million and $8.1 million , respectively. The year ended December 31, 2017 also includes $11.8 million of net foreign currency losses related to exiting foreign countries in connection with the company’s restructuring plan.

Litigation and contingencies

Litigation and contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Litigation and contingencies	Litigation and contingencies There are various lawsuits, claims, investigations and proceedings that have been brought or asserted against the company, which arise in the ordinary course of business, including actions with respect to commercial and government contracts, labor and employment, employee benefits, environmental matters, intellectual property, and non-income tax matters. The company records a provision for these matters when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. Any provisions are reviewed at least quarterly and are adjusted to reflect the impact and status of settlements, rulings, advice of counsel and other information and events pertinent to a particular matter. The company believes that it has valid defenses with respect to legal matters pending against it. Based on its experience, the company also believes that the damage amounts claimed in the lawsuits disclosed below are not a meaningful indicator of the company’s potential liability. Litigation is inherently unpredictable, however, and it is possible that the company’s results of operations or cash flows could be materially affected in any particular period by the resolution of one or more of the legal matters pending against it. In April 2007, the Ministry of Justice of Belgium sued Unisys Belgium SA-NV, a Unisys subsidiary (“Unisys Belgium”), in the Court of First Instance of Brussels. The Belgian government had engaged the company to design and develop software for a computerized system to be used to manage the Belgian court system. The Belgian State terminated the contract and in its lawsuit has alleged that the termination was justified because Unisys Belgium failed to deliver satisfactory software in a timely manner. It claims damages of approximately €28.0 million . Unisys Belgium filed its defense and counterclaim in April 2008, in the amount of approximately €18.5 million . The company believes it has valid defenses to the claims and contends that the Belgian State’s termination of the contract was unjustified. The company’s Brazilian operations, along with those of many other companies doing business in Brazil, are involved in various litigation matters, including numerous governmental assessments related to indirect and other taxes, as well as disputes associated with former employees and contract labor. The tax-related matters pertain to value added taxes, customs, duties, sales and other non-income related tax exposures. The labor-related matters include claims related to compensation. The company believes that appropriate accruals have been established for such matters based on information currently available. At December 31, 2017 , excluding those matters that have been assessed by management as being remote as to the likelihood of ultimately resulting in a loss, the amount related to unreserved tax-related matters, inclusive of any related interest, is estimated to be up to approximately $135.0 million . On June 26, 2014, the State of Louisiana filed a Petition for Damages against, among other defendants, the company and Molina Information Systems, LLC, in the Parish of East Baton Rouge, 19th Judicial District. The State alleged that between 1989 and 2012 the defendants, each acting successively as the State’s Medicaid fiscal intermediary, utilized an incorrect reimbursement formula for the payment of pharmaceutical claims causing the State to pay excessive amounts for prescription drugs. The State contends overpayments of approximately $68.0 million for the period January 2002 through July 2011 and is seeking data to identify the claims at issue for the remaining time period. The company believes that it has valid defenses to Louisiana’s claims and is asserting them in the pending litigation. With respect to the specific legal proceedings and claims described above, except as otherwise noted, either (i) the amount or range of possible losses in excess of amounts accrued, if any, is not reasonably estimable or (ii) the company believes that the amount or range of possible losses in excess of amounts accrued that are estimable would not be material. Litigation is inherently unpredictable and unfavorable resolutions could occur. Accordingly, it is possible that an adverse outcome from such matters could exceed the amounts accrued in an amount that could be material to the company’s financial condition, results of operations and cash flows in any particular reporting period. Notwithstanding that the ultimate results of the lawsuits, claims, investigations and proceedings that have been brought or asserted against the company are not currently determinable, the company believes that at December 31, 2017 , it has adequate provisions for any such matters.

Segment information

Segment information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment information	Segment information The company has two business segments: Services and Technology. Revenue classifications within the Services and Technology segment are as follows: • Cloud and infrastructure services. This represents revenue from helping clients apply cloud and as-a-service delivery models to capitalize on business opportunities, make their end users more productive and manage and secure their IT infrastructure and operations more economically. • Application services. This represents revenue from helping clients transform their business processes by developing and managing new leading-edge applications for select industries, offering advanced data analytics and modernizing existing enterprise applications. • Business process outsourcing (“BPO”) services. This represents revenue from the management of critical processes and functions for clients in target industries, helping them improve performance and reduce costs. • Technology. This represents revenue from designing and developing software and offering hardware and other related products to help clients reduce costs, improve security and flexibility and improve the efficiency of their data-center environments. The accounting policies of each business segment are the same as those followed by the company as a whole. Intersegment sales and transfers are priced as if the sales or transfers were to third parties. Accordingly, the Technology segment recognizes intersegment revenue and manufacturing profit on software and hardware shipments to customers under Services contracts. The Services segment, in turn, recognizes customer revenue and marketing profits on such shipments of company software and hardware to customers. The Services segment also includes the sale of software and hardware products sourced from third parties that are sold to customers through the company’s Services channels. In the company’s consolidated statements of income, the manufacturing costs of products sourced from the Technology segment and sold to Services customers are reported in cost of revenue for Services. Also included in the Technology segment’s sales and operating profit are sales of software and hardware sold to the Services segment for internal use in Services engagements. The amount of such profit included in operating income of the Technology segment for the years ended December 31, 2017 , 2016 and 2015 was $6.3 million , $0.7 million and $9.2 million , respectively. The profit on these transactions is eliminated in Corporate. The company evaluates business segment performance based on operating income exclusive of pension income or expense, restructuring charges and unusual and nonrecurring items, which are included in Corporate. All other corporate and centrally incurred costs are allocated to the business segments based principally on revenue, employees, square footage or usage. No single customer accounts for more than 10% of revenue. Revenue from various agencies of the U.S. Government, which is reported in both business segments, was approximately $571 million , $564 million and $569 million in 2017 , 2016 and 2015 , respectively. Corporate assets are principally cash and cash equivalents, prepaid postretirement assets and deferred income taxes. The expense or income related to corporate assets is allocated to the business segments. Customer revenue by classes of similar products or services, by segment, is presented below: Year ended December 31, 2017 2016 2015 Services Cloud & infrastructure services $ 1,317.0 $ 1,352.9 $ 1,513.1 Application services 808.3 859.0 868.9 BPO services 202.9 194.4 223.6 Total Services 2,328.2 2,406.3 2,605.6 Technology 413.6 414.4 409.5 Total customer revenue $ 2,741.8 $ 2,820.7 $ 3,015.1 Presented below is a reconciliation of segment operating income to consolidated income (loss) before income taxes: Year ended December 31, 2017 2016 2015 Total segment operating income $ 235.4 $ 208.4 $ 174.9 Interest expense (52.8 ) (27.4 ) (11.9 ) Other income (expense), net (23.9 ) 0.3 8.2 Cost reduction charges (a) (135.0 ) (82.1 ) (118.5 ) Corporate and eliminations (95.8 ) (78.7 ) (111.5 ) Total income (loss) before income taxes $ (72.1 ) $ 20.5 $ (58.8 ) (a) Year ended December 31, 2017 excludes $11.8 million for net foreign currency losses related to exiting foreign countries which are reported in Other income (expense), net in the consolidated statements of income. Presented below is a reconciliation of total business segment assets to consolidated assets: As of December 31, 2017 2016 2015 Total segment assets $ 1,364.5 $ 1,339.0 $ 1,486.0 Cash and cash equivalents 733.9 370.6 365.2 Deferred income taxes 119.9 146.1 127.4 Prepaid postretirement assets 148.3 33.3 45.1 Other corporate assets 175.8 132.6 106.3 Total assets $ 2,542.4 $ 2,021.6 $ 2,130.0 A summary of the company’s operations by business segment for 2017 , 2016 and 2015 is presented below: Total Corporate Services Technology 2017 Customer revenue $ 2,741.8 $ — $ 2,328.2 $ 413.6 Intersegment — (25.9 ) — 25.9 Total revenue $ 2,741.8 $ (25.9 ) $ 2,328.2 $ 439.5 Operating income (loss) $ 4.6 $ (230.8 ) $ 64.8 $ 170.6 Depreciation and amortization 156.5 — 84.6 71.9 Total assets 2,542.4 1,177.9 985.9 378.6 Capital expenditures 176.5 4.3 102.7 69.5 2016 Customer revenue $ 2,820.7 $ — $ 2,406.3 $ 414.4 Intersegment — (22.6 ) — 22.6 Total revenue $ 2,820.7 $ (22.6 ) $ 2,406.3 $ 437.0 Operating income (loss) $ 47.6 $ (160.8 ) $ 46.9 $ 161.5 Depreciation and amortization 155.6 — 81.8 73.8 Total assets 2,021.6 682.6 963.3 375.7 Capital expenditures 147.1 3.0 74.8 69.3 2015 Customer revenue $ 3,015.1 $ — $ 2,605.6 $ 409.5 Intersegment — (49.0 ) 0.1 48.9 Total revenue $ 3,015.1 $ (49.0 ) $ 2,605.7 $ 458.4 Operating income (loss) $ (55.1 ) $ (230.0 ) $ 61.2 $ 113.7 Depreciation and amortization 180.1 — 104.8 75.3 Total assets 2,130.0 644.0 1,081.7 404.3 Capital expenditures 213.7 1.9 143.3 68.5 Geographic information about the company’s revenue, which is principally based on location of the selling organization, properties and outsourcing assets, is presented below: Year ended December 31, 2017 2016 2015 Revenue United States $ 1,257.0 $ 1,309.3 $ 1,454.9 United Kingdom 315.8 348.0 375.8 Other foreign 1,169.0 1,163.4 1,184.4 Total Revenue $ 2,741.8 $ 2,820.7 $ 3,015.1 Properties, net United States $ 85.8 $ 91.4 $ 96.9 United Kingdom 16.7 15.1 18.8 Other foreign 40.0 38.8 38.1 Total Properties, net $ 142.5 $ 145.3 $ 153.8 Outsourcing assets, net United States $ 81.1 $ 105.1 $ 119.4 United Kingdom 89.9 39.0 36.6 Other foreign 31.3 28.4 26.0 Total Outsourcing assets, net $ 202.3 $ 172.5 $ 182.0

Employee plans

Employee plans	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee plans	Employee plans Stock plans Under stockholder approved stock-based plans, stock options, stock appreciation rights, restricted stock and restricted stock units may be granted to officers, directors and other key employees. At December 31, 2017 , 3.2 million shares of unissued common stock of the company were available for granting under these plans. As of December 31, 2017 , the company has granted non-qualified stock options and restricted stock units under these plans. The company recognizes compensation cost net of a forfeiture rate in selling, general and administrative expenses, and recognizes the compensation cost for only those awards expected to vest. The company estimates the forfeiture rate based on its historical experience and its expectations about future forfeitures. The company’s employee stock option grants include a provision that, if termination of employment occurs after the participant has attained age 55 and completed 5 years of service with the company, the participant shall continue to vest in each of his or her awards in accordance with the vesting schedule set forth in the applicable award agreement. Compensation expense for such awards is recognized over the period to the date the employee first becomes eligible for retirement. Time-based restricted stock unit grants for the company’s directors vest upon award and compensation expense for such awards is recognized upon grant. Options have been granted to purchase the company’s common stock at an exercise price equal to or greater than the fair market value at the date of grant, generally have a maximum duration of seven years for options issued in 2015 and later and five years for options issued before 2015, and become exercisable in annual installments over a three -year period following date of grant. During the years ended December 31, 2017 , 2016 and 2015 , the company recognized $11.2 million , $9.5 million and $9.4 million of share-based compensation expense, which is comprised of $10.1 million , $7.5 million and $4.7 million of restricted stock unit expense and $1.1 million , $2.0 million and $4.7 million of stock option expense, respectively. For stock options, the fair value is estimated at the date of grant using a Black-Scholes option pricing model. Principal assumptions used are as follows: (a) expected volatility for the company’s stock price is based on historical volatility and implied market volatility, (b) historical exercise data is used to estimate the options’ expected term, which represents the period of time that the options granted are expected to be outstanding, and (c) the risk-free interest rate is the rate on zero-coupon U.S. government issues with a remaining term equal to the expected life of the options. The company recognizes compensation expense for the fair value of stock options, which have graded vesting, on a straight-line basis over the requisite service period of the awards. The compensation expense recognized as of any date must be at least equal to the portion of the grant-date fair value that is vested at that date. There were no grants of stock option awards for the year ended December 31, 2017 . The fair value of stock option awards granted in 2016 and 2015 was estimated using the Black-Scholes option pricing model with the following assumptions and weighted-average fair values as follows: Year Ended December 31, 2016 2015 Weighted-average fair value of grant $ 4.53 $ 8.92 Risk-free interest rate 1.29 % 1.28 % Expected volatility 51.30 % 45.46 % Expected life of options in years 4.90 4.92 Expected dividend yield — — A summary of stock option activity for the year ended December 31, 2017 follows (shares in thousands): Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (years) Aggregate Intrinsic Value ($ in millions) Outstanding at December 31, 2016 2,099 $ 25.41 Granted — — Exercised (1 ) 10.65 Forfeited and expired (340 ) 20.59 Outstanding at December 31, 2017 1,758 26.35 1.56 $ — Expected to vest at December 31, 2017 198 23.20 3.42 $ — Exercisable at December 31, 2017 1,558 26.76 1.33 $ — The aggregate intrinsic value represents the total pretax value of the difference between the company’s closing stock price on the last trading day of the period and the exercise price of the options, multiplied by the number of in-the-money stock options that would have been received by the option holders had all option holders exercised their options on December 31, 2017 . The intrinsic value of the company’s stock options changes based on the closing price of the company’s stock. The total intrinsic value of options exercised for the year ended December 31, 2017 was immaterial, and for the years ended December 31, 2016 and 2015 was zero and $0.6 million , respectively. As of December 31, 2017 , $0.1 million of total unrecognized compensation cost related to stock options is expected to be recognized over a weighted-average period of 0.5 years. Restricted stock unit awards may contain time-based units, performance-based units or a combination of both. Each performance-based unit will vest into zero to 2.0 shares depending on the degree to which the performance goals are met. Compensation expense resulting from these awards is recognized as expense ratably for each installment from the date of grant until the date the restrictions lapse and is based on the fair market value at the date of grant and the probability of achievement of the specific performance-related goals. A summary of restricted stock unit activity for the year ended December 31, 2017 follows (shares in thousands): Restricted Stock Units Weighted-Average Grant-Date Fair Value Outstanding at December 31, 2016 1,454 $ 12.68 Granted 1,042 13.85 Vested (555 ) 13.31 Forfeited and expired (253 ) 11.88 Outstanding at December 31, 2017 1,688 13.39 The fair value of restricted stock units is determined based on the trading price of the company’s common shares on the date of grant. The aggregate weighted-average grant-date fair value of restricted stock units granted during the years ended December 31, 2017 , 2016 and 2015 was $14.4 million , $12.9 million and $10.2 million , respectively. As of December 31, 2017 , there was $9.8 million of total unrecognized compensation cost related to outstanding restricted stock units granted under the company’s plans. That cost is expected to be recognized over a weighted-average period of 1.9 years. The aggregate weighted-average grant-date fair value of restricted stock units vested during the years ended December 31, 2017 , 2016 and 2015 was $7.4 million , $3.5 million and $2.1 million , respectively. Common stock issued upon exercise of stock options or upon lapse of restrictions on restricted stock units are newly issued shares. Cash received from the exercise of stock options for the year ended December 31, 2017 was immaterial, and for the year ended December 31, 2016 was zero . During 2017 and 2016 , the company did not recognize any tax benefits from the exercise of stock options or upon issuance of stock upon lapse of restrictions on restricted stock units because of its tax position. Any such tax benefits resulting from tax deductions in excess of the compensation costs recognized are classified as operating cash flows. Defined contribution and compensation plans U.S. employees are eligible to participate in an employee savings plan. Under this plan, employees may contribute a percentage of their pay for investment in various investment alternatives. The company matches 50 percent of the first 6 percent of eligible pay contributed by participants to the plan on a before-tax basis (subject to IRS limits). The company funds the match with cash. The charge to income related to the company match for the years ended December 31, 2017 , 2016 and 2015 , was $10.8 million , $10.7 million and $9.9 million , respectively. The company has defined contribution plans in certain locations outside the United States. The charge to income related to these plans was $18.5 million , $19.0 million and $21.4 million , for the years ended December 31, 2017 , 2016 and 2015 , respectively. The company has non-qualified compensation plans, which allow certain highly compensated employees and directors to defer the receipt of a portion of their salary, bonus and fees. Participants can earn a return on their deferred balance that is based on hypothetical investments in various investment vehicles. Changes in the market value of these investments are reflected as an adjustment to the liability with an offset to expense. As of December 31, 2017 and 2016 , the liability to the participants of these plans was $13.4 million and $12.3 million , respectively. These amounts reflect the accumulated participant deferrals and earnings thereon as of that date. The company makes no contributions to the deferred compensation plans and remains contingently liable to the participants. Retirement benefits For the company’s more significant defined benefit pension plans, including the U.S., U.K. and the Netherlands, accrual of future benefits under the plans has ceased. The company adopted changes to a foreign defined benefit pension plan, which ended the accrual of future benefits, effective June 30, 2017. A curtailment gain of $5.4 million was recorded in 2017. In December 2016, the company completed a lump-sum offer for eligible former associates who had a deferred vested benefit under the company’s U.S. pension plan to receive the value of their entire pension benefit in a lump-sum payment. As a result, the pension plan trust made lump sum payments to approximately 5,800 former associates of $215.9 million . In accordance with accounting guidance on settlements of a pension benefit obligation, no settlement charges were recorded as a result of this action. Retirement plans’ funded status and amounts recognized in the company’s consolidated balance sheets at December 31, 2017 and 2016 follows: U.S. Plans International Plans As of December 31, 2017 2016 2017 2016 Change in projected benefit obligation Benefit obligation at beginning of year $ 4,972.0 $ 5,231.4 $ 3,076.2 $ 2,987.8 Service cost — — 5.1 7.4 Interest cost 211.3 231.3 72.8 87.8 Plan participants’ contributions — — 1.9 2.3 Plan amendment — — (52.5 ) — Plan curtailment — — (2.2 ) (3.7 ) Actuarial loss (gain) 177.0 87.2 (93.8 ) 502.2 Benefits paid (358.7 ) (577.9 ) (117.1 ) (110.0 ) Foreign currency translation adjustments — — 299.3 (397.6 ) Benefit obligation at end of year $ 5,001.6 $ 4,972.0 $ 3,189.7 $ 3,076.2 Change in plan assets Fair value of plan assets at beginning of year $ 3,452.1 $ 3,759.4 $ 2,429.7 $ 2,496.8 Actual return on plan assets 424.0 211.8 172.3 287.7 Employer contribution 61.0 58.8 77.4 73.7 Plan participants’ contributions — — 1.9 2.3 Benefits paid (358.7 ) (577.9 ) (117.1 ) (110.0 ) Foreign currency translation and other adjustments — — 269.7 (320.8 ) Fair value of plan assets at end of year $ 3,578.4 $ 3,452.1 $ 2,833.9 $ 2,429.7 Funded status at end of year $ (1,423.2 ) $ (1,519.9 ) $ (355.8 ) $ (646.5 ) Amounts recognized in the consolidated balance sheets consist of: Prepaid postretirement assets $ — $ — $ 147.4 $ 31.9 Other accrued liabilities (6.8 ) (6.7 ) (0.2 ) (0.2 ) Long-term postretirement liabilities (1,416.4 ) (1,513.2 ) (503.0 ) (678.2 ) Total funded status $ (1,423.2 ) $ (1,519.9 ) $ (355.8 ) $ (646.5 ) Accumulated other comprehensive loss, net of tax Net loss $ 2,690.6 $ 2,828.8 $ 1,067.8 $ 1,144.7 Prior service credit $ (39.8 ) $ (42.4 ) $ (69.8 ) $ (27.7 ) Accumulated benefit obligation $ 5,001.6 $ 4,972.0 $ 3,188.0 $ 3,072.1 Information for defined benefit retirement plans with an accumulated benefit obligation in excess of plan assets at December 31, 2017 and 2016 follows: As of December 31, 2017 2016 Accumulated benefit obligation $ 7,151.7 $ 7,551.8 Fair value of plan assets 5,227.0 5,357.2 Information for defined benefit retirement plans with a projected benefit obligation in excess of plan assets at December 31, 2017 and 2016 follows: As of December 31, 2017 2016 Projected benefit obligation $ 7,153.4 $ 7,555.2 Fair value of plan assets 5,227.0 5,357.2 Net periodic pension cost (income) for 2017 , 2016 and 2015 includes the following components: U.S. Plans International Plans Year ended December 31, 2017 2016 2015 2017 2016 2015 Service cost $ — $ — $ — $ 5.1 $ 7.4 $ 8.7 Interest cost 211.3 231.3 224.1 72.8 87.8 94.1 Expected return on plan assets (235.2 ) (253.1 ) (254.8 ) (127.5 ) (139.5 ) (155.4 ) Amortization of prior service credit (2.5 ) (2.5 ) (2.4 ) (2.4 ) (3.0 ) (1.9 ) Recognized net actuarial loss 126.4 116.0 132.7 49.8 40.3 63.6 Curtailment gain — — — (5.4 ) (2.0 ) — Net periodic pension cost (income) $ 100.0 $ 91.7 $ 99.6 $ (7.6 ) $ (9.0 ) $ 9.1 Weighted-average assumptions used to determine net periodic pension cost for the years ended December 31 were as follows: U.S. Plans International Plans Year ended December 31, 2017 2016 2015 2017 2016 2015 Discount rate 4.38 % 4.56 % 4.09 % 2.34 % 3.30 % 3.05 % Rate of compensation increase N/A N/A N/A 1.66 % 1.66 % 1.68 % Expected long-term rate of return on assets 6.80 % 6.80 % 6.80 % 5.30 % 5.99 % 6.45 % Weighted-average assumptions used to determine benefit obligations at December 31 were as follows: Discount rate 3.87 % 4.38 % 4.56 % 2.24 % 2.34 % 3.30 % Rate of compensation increase N/A N/A N/A 1.55 % 1.66 % 1.68 % The expected pretax amortization in 2018 of net periodic pension cost is as follows: net loss, $167.6 million ; and prior service credit, $(6.3) million . The amortization of these items is recorded as an element of pension expense. In 2017 , pension expense included amortization of $176.2 million of net losses and $(4.9) million of prior service credit. The company’s investment policy targets and ranges for each asset category are as follows: U.S. International Asset Category Target Range Target Range Equity securities 58 % 52-64% 24 % 18-30% Debt securities 36 % 33-39% 60 % 53-66% Real estate 6 % 3-9% 1 % 0-3% Cash — % 0-5% 1 % 0-5% Other — % — % 14 % 7-21% The company periodically reviews its asset allocation, taking into consideration plan liabilities, local regulatory requirements, plan payment streams and then-current capital market assumptions. The actual asset allocation for each plan is monitored at least quarterly, relative to the established policy targets and ranges. If the actual asset allocation is close to or out of any of the ranges, a review is conducted. Rebalancing will occur toward the target allocation, with due consideration given to the liquidity of the investments and transaction costs. The objectives of the company’s investment strategies are as follows: (a) to provide a total return that, over the long term, increases the ratio of plan assets to liabilities by maximizing investment return on assets, at a level of risk deemed appropriate, (b) to maximize return on assets by investing primarily in equity securities in the U.S. and for international plans by investing in appropriate asset classes, subject to the constraints of each plan design and local regulations, (c) to diversify investments within asset classes to reduce the impact of losses in single investments, and (d) for the U.S. plan to invest in compliance with the Employee Retirement Income Security Act of 1974 (“ERISA”), as amended and any subsequent applicable regulations and laws, and for international plans to invest in a prudent manner in compliance with local applicable regulations and laws. The company sets the expected long-term rate of return based on the expected long-term return of the various asset categories in which it invests. The company considered the current expectations for future returns and the actual historical returns of each asset class. Also, since the company’s investment policy is to actively manage certain asset classes where the potential exists to outperform the broader market, the expected returns for those asset classes were adjusted to reflect the expected additional returns. In 2018 , the company expects to make cash contributions of $149.7 million to its worldwide defined benefit pension plans, which are comprised of $63.4 million primarily for international defined benefit pension plans and $86.3 million for the company’s U.S. qualified defined benefit pension plan. As of December 31, 2017 , the following benefit payments, which reflect expected future service where applicable, are expected to be paid from the defined benefit pension plans: Year ending December 31, U.S. International 2018 $ 364.4 $ 98.7 2019 361.4 102.8 2020 359.3 106.9 2021 357.6 110.3 2022 355.1 117.5 2023 - 2027 1,693.6 642.5 Other postretirement benefits A reconciliation of the benefit obligation, fair value of the plan assets and the funded status of the postretirement benefit plan at December 31, 2017 and 2016 , follows: As of December 31, 2017 2016 Change in accumulated benefit obligation Benefit obligation at beginning of year $ 120.1 $ 131.5 Service cost 0.5 0.4 Interest cost 5.6 6.2 Plan participants’ contributions 3.5 3.8 Amendments (7.4 ) (3.3 ) Actuarial gain (4.3 ) (1.4 ) Federal drug subsidy 0.3 1.4 Benefits paid (15.7 ) (16.9 ) Foreign currency translation and other adjustments 0.6 (1.6 ) Benefit obligation at end of year $ 103.2 $ 120.1 Change in plan assets Fair value of plan assets at beginning of year $ 7.9 $ 7.7 Actual return on plan assets (0.3 ) (0.3 ) Employer contributions 12.2 13.6 Plan participants’ contributions 3.5 3.8 Benefits paid (15.7 ) (16.9 ) Fair value of plan assets at end of year $ 7.6 $ 7.9 Funded status at end of year $ (95.6 ) $ (112.2 ) Amounts recognized in the consolidated balance sheets consist of: Prepaid postretirement assets $ 0.9 $ 1.4 Other accrued liabilities (11.5 ) (12.4 ) Long-term postretirement liabilities (85.0 ) (101.2 ) Total funded status $ (95.6 ) $ (112.2 ) Accumulated other comprehensive loss, net of tax Net loss $ 14.9 $ 19.0 Prior service credit (9.8 ) (3.2 ) Net periodic postretirement benefit cost for 2017 , 2016 and 2015 , follows: Year ended December 31, 2017 2016 2015 Service cost $ 0.5 $ 0.4 $ 0.6 Interest cost 5.6 6.2 6.9 Expected return on assets (0.5 ) (0.4 ) (0.4 ) Amortization of prior service cost (0.7 ) — 1.1 Recognized net actuarial loss 0.8 0.5 1.8 Net periodic benefit cost $ 5.7 $ 6.7 $ 10.0 Weighted-average assumptions used to determine net periodic postretirement benefit cost for the years ended December 31 were as follows: Year ended December 31, 2017 2016 2015 Discount rate 5.53 % 5.61 % 5.27 % Expected return on plan assets 5.50 % 5.50 % 5.50 % Weighted-average assumptions used to determine benefit obligation at December 31 were as follows: Year ended December 31, 2017 2016 2015 Discount rate 5.30 % 5.53 % 5.61 % The expected pretax amortization in 2018 of net periodic postretirement benefit cost is as follows: net loss, $1.2 million ; and prior service cost, $(1.6) million . The company reviews its asset allocation periodically, taking into consideration plan liabilities, plan payment streams and then-current capital market assumptions. The company sets the long-term expected return on asset assumption, based principally on the long-term expected return on debt securities. These return assumptions are based on a combination of current market conditions, capital market expectations of third-party investment advisors and actual historical returns of the asset classes. In 2018 , the company expects to contribute approximately $12 million to its postretirement benefit plan. Assumed health care cost trend rates at December 31, 2017 2016 Health care cost trend rate assumed for next year 6.6 % 5.8 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.8 % 4.8 % Year that the rate reaches the ultimate trend rate 2023 2023 A one-percentage-point change in assumed health care cost trend rates would have the following effects: 1-Percentage- Point Increase 1-Percentage- Point Decrease Effect on service and interest cost $ 0.1 $ (0.1 ) Effect on postretirement benefit obligation 2.0 (1.7 ) As of December 31, 2017 , the following benefits are expected to be paid to or from the company’s postretirement plan: Year ending December 31, Gross Medicare Part D Receipts Gross Expected Payments 2018 $ 0.1 $ 12.7 2019 — 10.5 2020 — 10.0 2021 — 9.4 2022 — 8.8 2023 – 2027 — 34.4 The following provides a description of the valuation methodologies and the levels of inputs used to measure fair value, and the general classification of investments in the company’s U.S. and international defined benefit pension plans, and the company’s other postretirement benefit plan. Level 1 – These investments include cash, common stocks, real estate investment trusts, exchange traded funds, futures and options and U.S. government securities. These investments are valued using quoted prices in an active market. Payables and receivables are also included as Level 1 investments and are valued at face value. Level 2 – These investments include the following: Pooled Funds – These investments are comprised of money market funds and fixed income securities. The money market funds are valued using the readily determinable fair value (“RDFV”) provided by trustees of the funds. The fixed income securities are valued based on quoted prices for identical or similar investments in markets that may not be active. Commingled Funds – These investments are comprised of debt, equity and other securities and are valued using the RDFV provided by trustees of the funds. The fair value per share for these funds are published and are the basis for current transactions. Other Fixed Income – These investments are comprised of corporate and government fixed income investments and asset and mortgage backed securities for which there are quoted prices for identical or similar investments in markets that may not be active. Derivatives – These investments include forward exchange contracts and options, which are traded on an active market, but not on an exchange; therefore, the inputs may not be readily observable. These investments also include fixed income futures and other derivative instruments. Level 3 – These investments include the following: Insurance Contracts – These investments are insurance contracts which are carried at book value, are not publicly traded and are reported at a fair value determined by the insurance provider. Certain investments are valued using net asset value (“NAV”) as a practical expedient. These investments may not be redeemable on a daily basis and may have redemption notice periods of up to 90 days. These investments include the following: Commingled Funds – These investments are comprised of debt, equity and other securities. Private Real Estate and Private Equity - These investments represent interests in limited partnerships which invest in privately held companies or privately held real estate or other real assets. Net asset values are developed and reported by the general partners that manage the partnerships. These valuations are based on property appraisals, utilization of market transactions that provide valuation information for comparable companies, discounted cash flows, and other methods. These valuations are reported quarterly and adjusted as necessary at year end based on cash flows within the most recent period. The following table sets forth by level, within the fair value hierarchy, the plans’ assets (liabilities) at fair value at December 31, 2017 . U.S. Plans International Plans As of December 31, 2017 Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Pension plans Equity Securities Common Stocks $ 1,465.1 $ 1,461.9 $ 3.2 $ — $ — $ — $ — $ — Commingled Funds 584.4 584.4 84.0 84.0 Debt Securities U.S. Govt. Securities 139.8 139.8 Other Fixed Income 830.6 830.6 254.1 2.6 251.5 Insurance Contracts 135.8 135.8 Commingled Funds 267.5 267.5 Real Estate Real Estate Investment Trusts 113.5 113.5 1.4 0.4 1.0 Other Derivatives 2.6 13.1 (10.5 ) 1.2 1.2 Commingled Funds 357.1 357.1 Pooled Funds 228.0 228.0 29.2 29.2 Cash 34.8 34.8 25.1 25.1 Receivables 58.1 58.1 19.9 19.9 Payables (116.7 ) (116.7 ) (1.5 ) (1.5 ) Total plan assets in fair value hierarchy $ 3,340.2 $ 1,704.5 $ 1,635.7 $ — $ 1,173.8 $ 46.5 $ 991.5 $ 135.8 Plan assets measured using NAV as a practical expedient (a): Commingled Funds Equity $ — $ 780.7 Debt 19.8 837.7 Other 105.1 25.2 Private Real Estate 112.4 16.5 Private Equity 0.9 — Total pension plan assets $ 3,578.4 $ 2,833.9 Other postretirement plans Insurance Contracts $ 7.6 $ 7.6 (a) Investments measured at fair value using NAV as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. The following table sets forth by level, within the fair value hierarchy, the plans’ assets (liabilities) at fair value at December 31, 2016 . U.S. Plans International Plans As of December 31, 2016 Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Pension plans Equity Securities Common Stocks $ 1,443.1 $ 1,438.3 $ 4.8 $ — $ — $ — $ — $ — Commingled Funds 517.9 517.9 76.0 76.0 Debt Securities U.S. Govt. Securities 158.5 158.5 Other Fixed Income 812.4 812.4 241.4 0.5 240.9 Insurance Contracts 116.2 116.2 Commingled Funds 242.8 242.8 Real Estate Real Estate Investment Trusts 156.2 156.2 1.6 1.2 0.4 Other Derivatives 3.1 (1.1 ) 4.2 4.9 4.9 Commingled Funds 294.5 294.5 Pooled Funds 272.0 272.0 6.7 6.7 Cash 12.2 12.2 11.4 11.4 Receivables 107.2 107.2 Payables (195.3 ) (195.3 ) Total plan assets in fair value hierarchy $ 3,287.3 $ 1,676.0 $ 1,611.3 $ — $ 995.5 $ 13.1 $ 866.2 $ 116.2 Plan assets measured using NAV as a practical expedient (a): Commingled Funds Equity $ — $ 726.7 Debt 18.6 640.0 Other 104.6 25.8 Private Real Estate 40.5 41.7 Private Equity 1.1 — Total pension plan assets $ 3,452.1 $ 2,429.7 Other postretirement plans Insurance Contracts $ 7.9 $ 7.9 (a) Investments measured at fair value using NAV as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. The following table sets forth a summary of changes in the fair value of the plans’ Level 3 assets for the year ended December 31, 2017 . January 1, 2017 Realized gains (losses) Purchases or acquisitions Sales or dispositions Currency and unrealized gains (losses) relating to instruments still held at December 31, 2017 December 31, 2017 U.S. plans Other postretirement plans Insurance Contracts $ 7.9 $ (0.2 ) $ 0.2 $ (0.3 ) $ — $ 7.6 International pension plans Insurance Contracts $ 116.2 $ — $ 10.8 $ (11.4 ) $ 20.2 $ 135.8 The following table sets forth a summary of changes in the fair value of the plans’ Level 3 assets for the year ended December 31, 2016 . January 1, 2016 Realized gains (losses) Purchases or acquisitions Sales or dispositions Currency and unrealized gains (losses) relating to instruments still held at December 31, 2016 December 31, 2016 U.S. plans Other postretirement plans Insurance Contracts $ 7.7 $ (0.3 ) $ 0.5 $ — $ — $ 7.9 International pension plans Insurance Contracts $ 120.6 $ — $ 4.7 $ (11.0 ) $ 1.9 $ 116.2 The following table presents additional information about plan assets valued using the net asset value as a practical expedient within the fair value hierarchy table. 2017 2016 Fair Value Unfunded Commit-ments Redemption Frequency Redemption Notice Period Range Fair Value Unfunded Commit-ments Redemption Frequency Redemption Notice Period Range U.S. plans Commingled Funds Debt $ 19.8 $ — Daily 5 days $ 18.6 $ — Daily 5 days Other 105.1 — Monthly 5 days 104.6 — Monthly 5 days Private Real Estate (a) 112.4 — Quarterly Up to 90 days 40.5 — Quarterly 60 days Private Equity (b) 0.9 — 1.1 — Total $ 238.2 $ — $ 164.8 $ — International pension plans Commingled Funds Equity $ 780.7 $ — Weekly, Monthly Up to 30 days $ 726.7 $ — Weekly, Monthly Up to 90 days Debt 837.7 — Weekly, Biweekly, Bimonthly, Monthly Up to 30 days 640.0 — Weekly, Biweekly, Bimonthly, Monthly Up to 90 days Other 25.2 — Monthly Up to 30 days 25.8 — Monthly, Quarterly Up to 90 days Private Real Estate 16.5 — Monthly Up to 90 days 41.7 — Monthly, Quarterly Up to 90 days Total $ 1,660.1 $ — $ 1,434.2 $ — (a) Includes investments in private real estate funds and limited partnerships. The funds invest in U.S. real estate and allow redemptions quarterly, though queues, restrictions, and gates may extend the period. The limited partnerships include investments in primarily U.S. real estate, and can never be redeemed. The partnerships are all currently being wound up, and are expected to make all distributions over the next three years . (b) Includes investments in limited partnerships, which invest primarily in U.S. buyouts and venture capital. The investments can never be redeemed. The partnerships are all currently being wound up, and are expected to make all distributions over the next three years .

Stockholders' equity

Stockholders' equity	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Stockholders' equity	Stockholders’ equity The company has 150 million authorized shares of common stock, par value $.01 per share, and 40 million shares of authorized preferred stock, par value $1 per share, issuable in series. At December 31, 2017 , 35.1 million shares of unissued common stock of the company were reserved for stock-based incentive plans and the company’s convertible senior notes. Accumulated other comprehensive income (loss) as of December 31, 2017 , 2016 and 2015 , is as follows: Total Translation Adjustments Postretirement Plans Balance at December 31, 2014 $ (4,113.4 ) $ (737.8 ) $ (3,375.6 ) Other comprehensive income before reclassifications 346.2 (96.0 ) 442.2 Amounts reclassified from accumulated other comprehensive income (178.1 ) — (178.1 ) Current period other comprehensive income 168.1 (96.0 ) 264.1 Balance at December 31, 2015 (3,945.3 ) (833.8 ) (3,111.5 ) Other comprehensive income before reclassifications (64.9 ) (93.3 ) 28.4 Amounts reclassified from accumulated other comprehensive income (142.6 ) — (142.6 ) Current period other comprehensive income (207.5 ) (93.3 ) (114.2 ) Balance at December 31, 2016 (4,152.8 ) (927.1 ) (3,225.7 ) Other comprehensive income before reclassifications 506.8 121.9 384.9 Amounts reclassified from accumulated other comprehensive income (169.8 ) (11.8 ) (158.0 ) Current period other comprehensive income 337.0 110.1 226.9 Balance at December 31, 2017 $ (3,815.8 ) $ (817.0 ) $ (2,998.8 ) Amounts reclassified out of accumulated other comprehensive income for the three years ended December 31, 2017 are as follows: Year ended December 31, 2017 2016 2015 Translation Adjustments: Adjustment for substantial completion of liquidation of foreign subsidiaries (a) $ (11.8 ) $ — $ — Postretirement Plans: Amortization of prior service cost (b) 5.6 5.6 3.1 Amortization of actuarial losses (b) (174.1 ) (155.2 ) (189.7 ) Curtailment gain (b) 5.4 2.0 — Total before tax (174.9 ) (147.6 ) (186.6 ) Income tax benefit 5.1 5.0 8.5 Total reclassifications for the period $ (169.8 ) $ (142.6 ) $ (178.1 ) (a) Reported in Other income (expense), net in the consolidated statements of income (b) These items are included in net periodic postretirement cost (see Note 16). The following table summarizes the changes in shares of common stock and treasury stock during the three years ended December 31, 2017 : Common Stock Treasury Stock Balance at December 31, 2014 52.4 2.7 Stock-based compensation 0.2 — Balance at December 31, 2015 52.6 2.7 Stock-based compensation 0.2 — Balance at December 31, 2016 52.8 2.7 Stock-based compensation 0.6 0.2 Balance at December 31, 2017 53.4 2.9

Quarterly financial information

Quarterly financial information (unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly financial information (unaudited)	Quarterly financial information (unaudited) First Quarter Second Quarter Third Quarter Fourth Quarter Year 2017 Revenue $ 664.5 $ 666.2 $ 666.3 $ 744.8 $ 2,741.8 Gross profit 120.2 102.5 86.1 169.5 478.3 Income (loss) before income taxes (16.8 ) (42.3 ) (40.4 ) 27.4 (72.1 ) Net income (loss) attributable to Unisys Corporation common shareholders (32.7 ) (42.0 ) (41.1 ) 50.5 (65.3 ) Earnings (loss) per common share attributable to Unisys Corporation Basic (0.65 ) (0.83 ) (0.81 ) 1.00 (1.30 ) Diluted (0.65 ) (0.83 ) (0.81 ) 0.76 (1.30 ) 2016 Revenue $ 666.8 $ 748.9 $ 683.3 $ 721.7 $ 2,820.7 Gross profit 98.5 178.3 121.6 160.2 558.6 Income (loss) before income taxes (33.2 ) 44.3 (15.2 ) 24.6 20.5 Net income (loss) attributable to Unisys Corporation common shareholders (39.9 ) 21.6 (28.2 ) (1.2 ) (47.7 ) Earnings (loss) per common share attributable to Unisys Corporation Basic (0.80 ) 0.43 (0.56 ) (0.02 ) (0.95 ) Diluted (0.80 ) 0.36 (0.56 ) (0.02 ) (0.95 ) In the first, second, third and fourth quarters of 2017, the company recorded pretax cost-reduction and other charges of $25.4 million , $27.5 million , $46.1 million and $47.8 million , respectively. See Note 3, “Cost reduction actions,” of the Notes to Consolidated Financial Statements. In the first, second, third and fourth quarters of 2016, the company recorded pretax cost-reduction and other charges of $26.9 million , $10.2 million , $31.9 million and $13.1 million , respectively. See Note 3, “Cost reduction actions,” of the Notes to Consolidated Financial Statements. The individual quarterly per-share amounts may not total to the per-share amount for the full year because of accounting rules governing the computation of earnings per share.

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Millions) Description Balance at Beginning of Period Additions Charged to Costs and Expenses Deductions (a) Balance at End of Period Allowance for doubtful accounts (deducted from accounts receivable): Year Ended December 31, 2015 $ 30.1 $ 3.0 $ (12.0 ) $ 21.1 Year Ended December 31, 2016 $ 21.1 $ 2.2 $ (0.5 ) $ 22.8 Year Ended December 31, 2017 $ 22.8 $ 3.1 $ (3.9 ) $ 22.0 (a) Includes write-off of bad debts less recoveries, reclassifications from other current liabilities and foreign currency translation adjustments.

Summary of significant accoun28

Summary of significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Principles of consolidation	Principles of consolidation The consolidated financial statements include the accounts of all majority-owned subsidiaries.
Use of estimates	Use of estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions about future events. These estimates and assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and the reported amounts of revenue and expenses. Such estimates include the valuation of accounts receivable, inventories, outsourcing assets, marketable software, goodwill and other long-lived assets, legal contingencies, indemnifications, assumptions used in the measurement of progress toward completion for systems integration projects, income taxes and retirement and other post-employment benefits, among others. These estimates and assumptions are based on management’s best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods.
Cash and Cash equivalents	Cash and Cash equivalents Cash and cash equivalents consists of cash on hand, short-term investments purchased with a maturity of three months or less and certificates of deposit which may be withdrawn at any time at the discretion of the company without penalty. Cash and cash equivalents subject to contractual restrictions and not readily available are classified as restricted cash. Restricted cash primarily consists of cash the company is contractually obligated to maintain in accordance with the terms of its U.K. business process outsourcing joint venture agreement.
Inventories	Inventories Inventories are valued at the lower of cost and net realizable value. Cost is determined on the first-in, first-out method.
Properties	Properties Properties are carried at cost and are depreciated over the estimated lives of such assets using the straight-line method.
Advertising costs	Advertising costs All advertising costs are expensed as incurred.
Shipping and handling	Shipping and handling Costs related to shipping and handling are included in cost of revenue.
Goodwill	Goodwill Goodwill arising from the acquisition of an entity represents the excess of the cost of acquisition over the fair value of the acquired identifiable assets, liabilities and contingent liabilities of the entity recognized at the date of acquisition. Goodwill is initially recognized as an asset and is subsequently measured at cost less any accumulated impairment losses. Goodwill is held in the currency of the acquired entity and revalued to the closing rate at each balance sheet date. The company tests goodwill for impairment annually in the fourth quarter using data as of September 30th of that year, as well as whenever there are events or changes in circumstances (triggering events) that would more likely than not reduce the fair value of one or more reporting units below its respective carrying amount. The company compares the fair value of each of its reporting units to their respective carrying value. If the carrying value exceeds fair value, an impairment charge is recognized for the difference. Impaired goodwill is written down to its fair value through a charge to the consolidated statement of income in the period the impairment is identified. We estimate the fair value of each reporting unit using a combination of the income approach and market approach. The income approach incorporates the use of a discounted cash flow method in which the estimated future cash flows and terminal values for each reporting unit are discounted to present value. Cash flow projections are based on management’s estimates of economic and market conditions, which drive key assumptions of revenue growth rates, operating margins, capital expenditures and working capital requirements. The discount rate in turn is based on various market factors and specific risk characteristics of each reporting unit. The market approach estimates fair value by applying performance metric multiples to the reporting unit’s prior and expected operating performance. The multiples are derived from comparable publicly traded companies with similar operating and investment characteristics as the reporting unit. If the fair value of the reporting unit derived using the income approach is significantly different from the fair value estimate using the market approach, the company reevaluates its assumptions used in the two models. When considering the weighting between the market approach and income approach, we gave more weighting to the income approach. The higher weighting assigned to the income approach took into consideration that the guideline companies used in the market approach generally represent larger diversified companies relative to the reporting units and may have different long term growth prospects, among other factors. In order to assess the reasonableness of the calculated reporting unit fair values, the company also compares the sum of the reporting units’ fair values to its market capitalization (per share stock price multiplied by shares outstanding) and calculates an implied control premium (the excess of the sum of the reporting units’ fair values over the market capitalization). Estimating the fair value of reporting units requires the use of estimates and significant judgments that are based on a number of factors including actual operating results. It is reasonably possible that the judgments and estimates described above could change in future periods.
Revenue recognition	Revenue recognition Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the fee is fixed or determinable, and collectability is probable. Revenue from hardware sales with standard payment terms is recognized upon the passage of title and the transfer of risk of loss. Outside the United States, the company recognizes revenue even if it retains a form of title to products delivered to customers, provided the sole purpose is to enable the company to recover the products in the event of customer payment default and the arrangement does not prohibit the customer’s use of the product in the ordinary course of business. Revenue from software licenses with standard payment terms is recognized at the inception of the initial license term and upon execution of an extension to the license term. The company also enters into multiple-element arrangements, which may include any combination of software, hardware, or services. For example, a client may purchase an enterprise server that includes operating system software. In addition, the arrangement may include post-contract support for the software and a contract for post-warranty maintenance for service of the hardware. These arrangements consist of multiple deliverables, with software and hardware delivered in one reporting period and the software support and hardware maintenance services delivered across multiple reporting periods. In another example, the company may provide desktop managed services to a client on a long term multiple year basis and periodically sell software and hardware products to the client. The services are provided on a continuous basis across multiple reporting periods and the software and hardware products are delivered in one reporting period. To the extent that a deliverable in a multiple-deliverable arrangement is subject to specific guidance, that deliverable is accounted for in accordance with such specific guidance. Examples of such arrangements may include leased hardware which is subject to specific leasing guidance or software which is subject to specific software revenue recognition guidance. In these transactions, the company allocates the total revenue to be earned under the arrangement among the various elements based on a selling price hierarchy. The selling price for a deliverable is based on its vendor specific objective evidence (“VSOE”) if available, third party evidence (“TPE”) if VSOE is not available, or the best estimated selling price (“ESP”) if neither VSOE nor TPE is available. VSOE of selling price is based upon the normal pricing and discounting practices for those services and products when sold separately. TPE of selling price is based on evaluating largely similar and interchangeable competitor products or services in standalone sales to similarly situated customers. ESP is established considering factors such as margin objectives, discounts off of list prices, market conditions, competition and other factors. ESP represents the price at which the company would transact for the deliverable if it were sold by the company regularly on a standalone basis. As mentioned above, some of the company’s multiple-element arrangements may include leased hardware which is subject to specific leasing guidance. Revenue under these arrangements is allocated considering the relative selling prices of the lease and non-lease elements. Lease deliverables include hardware, financing, maintenance and other executory costs, while non-lease deliverables generally consist of services other than maintenance. The determination of the amount of revenue allocated to the lease deliverables begins by allocating revenue to maintenance and other executory costs plus a profit thereon. These elements are generally recognized over the term of the lease. The remaining amounts are allocated to the hardware and financing elements. The amount allocated to hardware is recognized as revenue monthly over the term of the lease for those leases which are classified as operating leases and at the inception of the lease term for those leases which are classified as sales-type leases. The amount of finance income attributable to sales-type leases is recognized on the accrual basis using the effective interest method. For multiple-element arrangements that involve the licensing, selling or leasing of software, for software and software-related elements, the allocation of revenue is based on VSOE. There may be cases in which there is VSOE of fair value of the undelivered elements but no such evidence for the delivered elements. In these cases, the residual method is used to allocate the arrangement consideration. Under the residual method, the amount of consideration allocated to the delivered elements equals the total arrangement consideration less the aggregate VSOE of fair value of the undelivered elements. For multiple-element arrangements that include services or products that (a) do not include the licensing, selling or leasing of software, or (b) contain software that is incidental to the services or products as a whole or (c) contain software components that are sold, licensed or leased with tangible products when the software components and non-software components (i.e., the software and hardware) of the tangible product function together to deliver the tangible product’s essential functionality (e.g., sales of the company’s enterprise-class servers including software and hardware), or some combination of the above, the allocation of revenue is based on the relative selling prices of each of the deliverables in the arrangement based on the selling price hierarchy, discussed above. For multiple-element arrangements that include both software and non-software deliverables, the company allocates arrangement consideration to the software group and to the non-software group based on the relative selling prices of the deliverables in the arrangement based on the selling price hierarchy discussed above. For the software group, arrangement consideration is further allocated using VSOE as described above. The company recognizes revenue on delivered elements only if: (a) any undelivered services or products are not essential to the functionality of the delivered services or products, (b) the company has an enforceable claim to receive the amount due in the event it does not deliver the undelivered services or products, (c) there is evidence of the selling price for each undelivered service or product, and (d) the revenue recognition criteria otherwise have been met for the delivered elements. Otherwise, revenue on delivered elements is recognized as the undelivered elements are delivered. The company evaluates each deliverable in an arrangement to determine whether it represents a separate unit of accounting. A delivered element constitutes a separate unit of accounting when it has standalone value and there is no customer-negotiated refund or return right for the delivered elements. If these criteria are not met, the deliverable is combined with the undelivered elements and the allocation of the arrangement consideration and revenue recognition are determined for the combined unit as a single unit. Revenue from hardware sales and software licenses with extended payment terms is recognized as payments from customers become due (assuming that all other conditions for revenue recognition have been satisfied). Revenue for operating leases is recognized on a monthly basis over the term of the lease and for sales-type leases at the inception of the lease term. Revenue from equipment and software maintenance and post-contract support is recognized on a straight-line basis as earned over the terms of the respective contracts. Cost related to such contracts is recognized as incurred. Revenue and profit under systems integration contracts are recognized either on the percentage-of-completion method of accounting using the cost-to-cost method, or when services have been performed, depending on the nature of the project. For contracts accounted for on the percentage-of-completion basis, revenue and profit recognized in any given accounting period are based on estimates of total projected contract costs. The estimates are continually reevaluated and revised, when necessary, throughout the life of a contract. Any adjustments to revenue and profit resulting from changes in estimates are accounted for in the period of the change in estimate. When estimates indicate that a loss will be incurred on a contract upon completion, a provision for the expected loss is recorded in the period in which the loss becomes evident. Revenue from time and materials service contracts and outsourcing contracts is recognized as the services are provided using either an objective measure of output or on a straight-line basis over the term of the contract.
Income taxes	Income taxes Income taxes are based on income before taxes for financial reporting purposes and reflect a current tax liability for the estimated taxes payable in the current-year tax returns and changes in deferred taxes. Deferred tax assets or liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and are measured using enacted tax laws and rates. A valuation allowance is provided on deferred tax assets if it is determined that it is more likely than not that the asset will not be realized. The company recognizes penalties and interest accrued related to income tax liabilities in provision for income taxes in its consolidated statements of income.
Marketable software	Marketable software The cost of development of computer software to be sold or leased, incurred subsequent to establishment of technological feasibility, is capitalized and amortized to cost of sales over the estimated revenue-producing lives of the products, which is generally not in excess of three years following product release. The company performs quarterly reviews to ensure that unamortized costs remain recoverable from future revenue.
Internal-use software	Internal-use software The company capitalizes certain internal and external costs incurred to acquire or create internal-use software, principally related to software coding, designing system interfaces, and installation and testing of the software. These costs are amortized in accordance with the fixed asset policy described above.
Outsourcing assets	Outsourcing assets Costs on outsourcing contracts are generally expensed as incurred. However, certain costs incurred upon initiation of an outsourcing contract (principally initial customer setup) are deferred and expensed over the initial contract life. Fixed assets and software used in connection with outsourcing contracts are capitalized and depreciated over the shorter of the initial contract life or in accordance with the fixed asset policy described above. Recoverability of outsourcing assets is subject to various business risks. Quarterly, the company compares the carrying value of the outsourcing assets with the undiscounted future cash flows expected to be generated by the outsourcing assets to determine if there is impairment. If impaired, the outsourcing assets are reduced to an estimated fair value on a discounted cash flow basis. The company prepares its cash flow estimates based on assumptions that it believes to be reasonable but are also inherently uncertain. Actual future cash flows could differ from these estimates.
Translation of foreign currency	Translation of foreign currency The local currency is the functional currency for most of the company’s international subsidiaries, and as such, assets and liabilities are translated into U.S. dollars at year-end exchange rates. Income and expense items are translated at average exchange rates during the year. Translation adjustments resulting from changes in exchange rates are reported in other comprehensive income (loss). Exchange gains and losses on intercompany balances are reported in other income (expense), net. For those international subsidiaries operating in highly inflationary economies, the U.S. dollar is the functional currency, and as such, nonmonetary assets and liabilities are translated at historical exchange rates, and monetary assets and liabilities are translated at current exchange rates. Exchange gains and losses arising from translation are included in other income (expense), net.
Stock-based compensation plans	Stock-based compensation plans Stock-based compensation represents the cost related to stock-based awards granted to employees and directors. The company recognizes compensation expense for the fair value of stock options, which have graded vesting, on a straight-line basis over the requisite service period. The company estimates the fair value of stock options using a Black-Scholes valuation model. The expense is recorded in selling, general and administrative expenses.
Retirement benefits	Retirement benefits Accounting rules covering defined benefit pension plans and other postretirement benefits require that amounts recognized in financial statements be determined on an actuarial basis. A significant element in determining the company’s retirement benefits expense or income is the expected long-term rate of return on plan assets. This expected return is an assumption as to the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the projected pension benefit obligation. The company applies this assumed long-term rate of return to a calculated value of plan assets, which recognizes changes in the fair value of plan assets in a systematic manner over four years. This produces the expected return on plan assets that is included in retirement benefits expense or income. The difference between this expected return and the actual return on plan assets is deferred. The net deferral of past asset losses or gains affects the calculated value of plan assets and, ultimately, future retirement benefits expense or income. At December 31 of each year, the company determines the fair value of its retirement benefits plan assets as well as the discount rate to be used to calculate the present value of plan liabilities. The discount rate is an estimate of the interest rate at which the retirement benefits could be effectively settled. In estimating the discount rate, the company looks to rates of return on high-quality, fixed-income investments currently available and expected to be available during the period to maturity of the retirement benefits. The company uses a portfolio of fixed-income securities, which receive at least the second-highest rating given by a recognized ratings agency.
Fair value measurements	Fair value measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining fair value measurements for assets and liabilities required to be recorded at fair value, the company assumes that the transaction is an orderly transaction that assumes exposure to the market for a period before the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction (for example, a forced liquidation or distress sale). The fair value hierarchy has three levels of inputs that may be used to measure fair value: Level 1 – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the company can access at the measurement date; Level 2 – Inputs other than quoted prices within Level 1 that are observable for the asset or liability, either directly or indirectly; and Level 3 – Unobservable inputs for the asset or liability. The company has applied fair value measurements to its long-term debt (see note 9), derivatives (see note 12) and to its postretirement plan assets (see note 16).
Noncontrolling interest	Noncontrolling interest The company owns a fifty-one percent interest in Intelligent Processing Solutions Ltd. (“iPSL”), a U.K. business process outsourcing joint venture. The remaining interests, which are reflected as a noncontrolling interest in the company’s financial statements, are owned by three financial institutions for which iPSL performs services.
Recent accounting pronouncements and accounting changes	Accounting Pronouncements Adopted Effective January 1, 2017, the company adopted Accounting Standards Update (“ASU”) No. 2017-04 Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment issued by the Financial Accounting Standards Board (“FASB”) which simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of that goodwill. Under the amended guidance, an entity will perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge will be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value. Adoption of this new guidance had no impact on the company’s consolidated results of operations and financial position. Effective January 1, 2017, the company adopted ASU No. 2016-18 Statement of Cash Flows (Topic 230) - Restricted Cash issued by the FASB which requires companies to include amounts generally described as restricted cash or restricted cash equivalents with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The new guidance has been applied on retrospective basis whereby prior-period financial statements have been adjusted to reflect the application of the new guidance, as required by the FASB. Amounts reclassified in the consolidated statements of cash flows for the years ended December 31, 2016 and 2015 are as follows: Year ended December 31, 2016 2015 Cash flows from operating activities Other assets $ (1.9 ) 2.60 $ 2.6 Cash flows from investing activities Other 1.6 (2.3 ) Effect of exchange rate changes on cash, cash equivalents and restricted cash (0.8 ) (4.6 ) Cash, cash equivalents and restricted cash, beginning of year 31.6 35.9 Cash, cash equivalents and restricted cash, end of year 30.5 31.6 Effective January 1, 2017, the company adopted ASU No. 2016-16 Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory issued by the FASB which allows the recognition of deferred income taxes for an intra-entity asset transfer, other than inventory, when the transfer occurs. Historically, recognition of the income tax consequence was not recognized until the asset was sold to an outside party. The new guidance has been applied on a modified retrospective basis through a cumulative-effect adjustment directly to accumulated deficit. At January 1, 2017, the adjustment to accumulated deficit was an increase of $4.4 million . Effective January 1, 2017, the company adopted ASU No. 2016-15 Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force) , issued by the FASB which clarifies the treatment of several cash flow categories. In addition, the guidance also clarifies that when cash receipts and cash payments have aspects of more than one class of cash flows and cannot be separated, classification will depend on the predominant source or use. The company previously reported premium payments on and proceeds from the settlement of corporate-owned life insurance policies as cash flows from operating activities in the company’s consolidated statement of cash flows. Under the new guidance, these amounts were reclassified to investing activities. The new guidance has been applied on a retrospective basis whereby prior-period financial statements have been adjusted to reflect the application of the new guidance, as required by the FASB. For the years ended December 31, 2016 and 2015, $1.5 million and $1.1 million , respectively, were reclassified from “other assets” in operating activities to “other” in investing activities in the company’s consolidated statements of cash flows. Effective January 1, 2017, the company adopted ASU No. 2016-09 Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting , issued by the FASB, which changes certain aspects of accounting for share-based payments to employees. The new guidance requires all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also allows an employer to repurchase more of an employee’s shares than it can today for tax withholding purposes without triggering liability accounting and to make a policy election to account for forfeitures as they occur. Additionally, the standard requires all tax-related cash flows resulting from share-based payments to be reported as operating activities on the consolidated statement of cash flows, and any cash payments made to taxing authorities on an employee’s behalf as financing activities, which the company previously reported as operating activities. The new guidance has been applied on a retrospective basis whereby prior-period financial statements have been adjusted to reflect the application of the new guidance, as required by the FASB. For the years ended December 31, 2016 and 2015, $0.4 million and $0.8 million , respectively, were reclassified from “accounts payable and other accrued liabilities” in operating activities to “other” in financing activities in the company’s consolidated statements of cash flows. Accounting Pronouncements Not Yet Adopted In March 2017, the FASB issued ASU No. 2017-07 Compensation—Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost , which requires employers to present the service cost component of net periodic benefit cost in the same income statement line item(s) as other employee compensation costs arising from services rendered during the period. Only the service cost component will be eligible for capitalization in assets. The other components of net periodic benefit cost will be presented separately from the line items that include service cost and outside the subtotal of operating income. This update is effective for annual periods beginning after December 15, 2017, which for the company is January 1, 2018. Adoption of this new guidance will result in the reclassification of net periodic benefit cost, other than service costs ( $92.5 million and $81.6 million for the years ended December 31, 2017 and 2016, respectively), from operating income to non-operating income. There will be no overall impact on the company’s consolidated financial position. In June 2016, the FASB issued ASU No. 2016-13 Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments , which introduces a new model for recognizing credit losses on financial instruments based on an estimate of current expected losses. This includes trade and other receivables, loans and other financial instruments. This update is effective for annual periods beginning after December 15, 2019, with earlier adoption permitted. The company is currently assessing when it will choose to adopt, and is currently evaluating the impact of the adoption on its consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02 Leases (Topic 842) , which is intended to improve financial reporting about leasing transactions. The ASU requires organizations that lease assets, referred to as lessees, to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. The standard requires disclosures to help investors and other financial statement users better understand the amount, timing and uncertainty of cash flows arising from leases. The standard is effective for annual reporting periods beginning after December 15, 2018, with earlier adoption permitted. The company will adopt the new guidance on January 1, 2019, and is currently evaluating the impact of the adoption on its consolidated results of operations and financial position. In May 2014, the FASB issued ASU No. 2014-09 Revenue from Contracts with Customers (Topic 606) , which establishes principles that an entity shall apply to report useful information to users of financial statements about the nature, amount, timing and uncertainty of revenue and cash flows from a contract with a customer. The standard, and its various amendments, is effective for annual reporting periods beginning after December 15, 2017, which for the company is January 1, 2018. The standard allows for either “full retrospective” adoption, meaning the standard is applied to all periods presented, or “modified retrospective” adoption, meaning the standard is applied only to the most current period presented in the financial statements. The new standard would require the company to recognize revenue for certain transactions, including extended payment term software licenses and short-term software licenses, sooner than the current rules would allow and require the company to recognize software license extensions and renewals (the most significant impact upon adoption), later than the current rules would allow. The standard also requires significantly expanded disclosure requirements. The company will adopt the standard on January 1, 2018 using the modified retrospective method. The company does not believe there will be a material impact to its consolidated financial position upon adoption.

Summary of significant accoun29

Summary of significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets to the total of the amounts shown in the consolidated statements of cash flows. As of December 31, 2017 2016 Cash and cash equivalents $ 733.9 $ 370.6 Restricted cash 30.2 30.5 Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 764.1 $ 401.1
Schedule of Restricted Cash and Cash Equivalents	The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the consolidated balance sheets to the total of the amounts shown in the consolidated statements of cash flows. As of December 31, 2017 2016 Cash and cash equivalents $ 733.9 $ 370.6 Restricted cash 30.2 30.5 Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 764.1 $ 401.1

Earnings per common share (Tabl

Earnings per common share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation	The following table shows how the loss per common share attributable to Unisys Corporation was computed for the three years ended December 31, 2017 (shares in thousands). Year ended December 31, 2017 2016 2015 Basic earnings (loss) per common share computation: Net loss attributable to Unisys Corporation common shareholders $ (65.3 ) $ (47.7 ) $ (109.9 ) Weighted average shares 50,409 50,060 49,905 Basic loss per common share $ (1.30 ) $ (0.95 ) $ (2.20 ) Diluted earnings (loss) per common share computation: Net loss attributable to Unisys Corporation for diluted earnings per share $ (65.3 ) $ (47.7 ) $ (109.9 ) Weighted average shares 50,409 50,060 49,905 Diluted loss per common share $ (1.30 ) $ (0.95 ) $ (2.20 ) Anti-dilutive weighted-average stock options and restricted stock units (a) 2,206 3,553 2,915 Anti-dilutive weighted-average common shares issuable upon conversion of the 5.50% convertible senior notes (a) 21,868 17,230 — (a) Amounts represent shares excluded from the computation of diluted earnings per share, as their effect, if included, would have been anti-dilutive for the periods presented.

Cost reduction actions (Tables)

Cost reduction actions (Tables)	12 Months Ended
	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Reconciliation of Liabilities and Expected Future Payments	Liabilities and expected future payments related to these costs are as follows: Work-Force Reductions Idle Leased Total U.S. International Facilities Costs Charges for work-force reductions $ 78.8 $ 27.9 $ 50.9 $ — Payments (45.3 ) (23.7 ) (21.6 ) — Translation adjustments (0.5 ) (0.5 ) — Balance at December 31, 2015 33.0 4.2 28.8 — Additional Provisions 68.3 8.3 58.6 1.4 Payments (59.3 ) (9.4 ) (49.9 ) — Changes in estimates (4.3 ) (1.3 ) (3.0 ) — Translation adjustments (1.1 ) — (1.1 ) — Balance at December 31, 2016 36.6 1.8 33.4 1.4 Additional Provisions 131.2 9.4 117.6 4.2 Payments (49.3 ) (6.0 ) (41.3 ) (2.0 ) Changes in estimates (8.6 ) (1.3 ) (7.8 ) 0.5 Translation adjustments 7.9 — 7.7 0.2 Balance at December 31, 2017 $ 117.8 $ 3.9 $ 109.6 $ 4.3 Expected future payments on balance at December 31, 2017 In 2018 $ 87.7 $ 3.9 $ 82.0 $ 1.8 Beyond 2018 30.1 — 27.6 2.5

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill by Segment	Changes in the carrying amount of goodwill by segment for the years ended December 31, 2017 and 2016 were as follows: Total Services Technology Balance at December 31, 2015 $ 177.4 $ 68.7 $ 108.7 Translation adjustments 1.2 1.2 — Balance at December 31, 2016 178.6 69.9 108.7 Translation adjustments 2.2 2.2 — Balance at December 31, 2017 $ 180.8 $ 72.1 $ 108.7

Recent accounting pronounceme33

Recent accounting pronouncements and accounting changes (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Schedule of Amounts Reclassified in Consolidated Statements of Cash Flows	Amounts reclassified in the consolidated statements of cash flows for the years ended December 31, 2016 and 2015 are as follows: Year ended December 31, 2016 2015 Cash flows from operating activities Other assets $ (1.9 ) 2.60 $ 2.6 Cash flows from investing activities Other 1.6 (2.3 ) Effect of exchange rate changes on cash, cash equivalents and restricted cash (0.8 ) (4.6 ) Cash, cash equivalents and restricted cash, beginning of year 31.6 35.9 Cash, cash equivalents and restricted cash, end of year 30.5 31.6

Accounts receivable (Tables)

Accounts receivable (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Schedule of Receivables Under Sales-Type Lease	As of December 31, 2017 , receivables under sales-type leases before the allowance for unearned income were collectible as follows: Year 2018 $ 45.5 2019 25.8 2020 16.3 2021 10.8 2022 9.7 Thereafter 19.1 Total $ 127.2

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Total Income (Loss) Before Income Taxes and Provision for Income Taxes	Following is the total income (loss) before income taxes and the provision for income taxes for the three years ended December 31, 2017 . Year ended December 31, 2017 2016 2015 Income (loss) before income taxes United States $ (152.7 ) $ (88.3 ) $ (130.6 ) Foreign 80.6 108.8 71.8 Total income (loss) before income taxes $ (72.1 ) $ 20.5 $ (58.8 ) Provision for income taxes Current United States $ (42.8 ) $ 6.7 $ 1.0 Foreign 33.9 47.7 42.2 State and local — — 0.3 Total (8.9 ) 54.4 43.5 Deferred Foreign 3.4 2.8 0.9 Total (benefit) provision for income taxes $ (5.5 ) $ 57.2 $ 44.4
Reconciliation of the Provision for Income Taxes	Following is a reconciliation of the (benefit) provision for income taxes at the United States statutory tax rate to the provision for income taxes as reported: Year ended December 31, 2017 2016 2015 United States statutory income tax provision (benefit) $ (25.2 ) $ 7.2 $ (20.6 ) Income and losses for which no provision or benefit has been recognized 70.3 65.5 69.1 Foreign rate differential and other foreign tax expense (11.3 ) (21.1 ) (15.9 ) Income tax withholdings 16.8 22.8 12.5 Permanent items (3.0 ) (4.7 ) (1.9 ) Enacted rate changes (0.4 ) 3.5 9.1 Change in uncertain tax positions 2.3 0.4 1.5 Change in valuation allowances due to changes in judgment (4.6 ) (16.4 ) (5.4 ) Income tax credits, U.S. (50.4 ) — (4.0 ) (Benefit) provision for income taxes $ (5.5 ) $ 57.2 $ 44.4
Significant Portions of Deferred Tax Assets and Liabilities	The tax effects of temporary differences and carryforwards that give rise to significant portions of deferred tax assets and liabilities at December 31, 2017 and 2016 were as follows: As of December 31, 2017 2016 Deferred tax assets Tax loss carryforwards $ 837.6 $ 889.6 Postretirement benefits 437.7 728.9 Foreign tax credit carryforwards 127.0 317.6 Other tax credit carryforwards 29.1 91.4 Deferred revenue 40.9 81.0 Employee benefits and compensation 35.2 49.1 Purchased capitalized software 22.2 32.6 Depreciation 24.5 28.3 Warranty, bad debts and other reserves 5.3 16.1 Capitalized costs 3.1 10.9 Other 39.3 27.7 1,601.9 2,273.2 Valuation allowance (1,441.1 ) (2,084.6 ) Total deferred tax assets $ 160.8 $ 188.6 Deferred tax liabilities Capitalized research and development $ 24.3 $ 20.3 Other 25.8 28.4 Total deferred tax liabilities $ 50.1 $ 48.7 Net deferred tax assets $ 110.7 $ 139.9
Reconciliation of Changes in Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: Year ended December 31, 2017 2016 2015 Balance at January 1 $ 35.8 $ 27.7 $ 35.0 Additions based on tax positions related to the current year 4.2 2.7 3.4 Changes for tax positions of prior years (11.2 ) 12.0 (4.0 ) Reductions as a result of a lapse of applicable statute of limitations (2.7 ) (2.8 ) (3.4 ) Settlements (0.2 ) (0.1 ) (0.9 ) Changes due to foreign currency 2.0 (3.7 ) (2.4 ) Balance at December 31 $ 27.9 $ 35.8 $ 27.7

Properties (Tables)

Properties (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Components of Properties	Properties comprise the following: As of December 31, 2017 2016 Land $ 2.8 $ 2.7 Buildings 91.3 88.2 Machinery and office equipment 601.7 591.7 Internal-use software 157.4 145.9 Rental equipment 45.6 58.1 Total properties $ 898.8 $ 886.6

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Components of Long-Term Debt	Long-term debt is comprised of the following: As of December 31, 2017 2016 10.75% senior secured notes due April 15, 2022 ($440.0 million face value less unamortized discount and fees of $10.4 million at December 31, 2017) $ 429.6 $ — 5.50% convertible senior notes due March 1, 2021 ($213.5 million face value less unamortized discount and fees of $27.2 million and $34.4 million at December 31, 2017 and 2016, respectively) 186.3 179.1 6.25% senior notes — 94.7 Capital leases 7.5 10.1 Other debt 21.3 16.1 Total 644.7 300.0 Less – current maturities 10.8 106.0 Total long-term debt $ 633.9 $ 194.0
Estimated Fair Values of Long-term Debt	Presented below are the estimated fair values of long-term debt as of December 31, 2017 and 2016 . As of December 31, 2017 2016 10.75% senior secured notes due April 15, 2022 (a) $ 492.8 $ — 5.50% convertible senior notes due March 1, 2021 237.9 379.8 6.25% senior notes (b) — 97.8 (a) Issued in April 2017 (b) Retired in April 2017
Schedule of Maturities of Long-term Debt, Including Capital Leases	Maturities of long-term debt, including capital leases, in each of the next five years and thereafter are as follows: Year Total Long-Term Debt Capital Leases 2018 $ 10.8 $ 8.2 $ 2.6 2019 1.4 — 1.4 2020 2.3 0.9 1.4 2021 189.5 188.1 1.4 2022 432.3 431.5 0.8 Thereafter 8.4 8.4 — Total $ 644.7 $ 637.1 $ 7.6
Schedule of Interest Expense	Interest expense related to the 2021 Notes (a) is comprised of the following: Year ended December 31, 2017 2016 Contractual interest coupon $ 11.8 $ 9.2 Amortization of debt discount 6.0 4.3 Amortization of debt issuance costs 1.2 1.0 Total $ 19.0 $ 14.5 (a) Issued in 2016

Other accrued liabilities (Tabl

Other accrued liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Other Accrued Liabilities (Current)	Other accrued liabilities (current) are comprised of the following: As of December 31, 2017 2016 Payrolls and commissions $ 120.2 $ 110.6 Cost reduction 87.7 21.2 Accrued vacations 42.8 47.1 Taxes other than income taxes 29.1 25.4 Income taxes 26.0 35.3 Postretirement 18.5 19.3 Accrued interest 13.8 6.1 Other 53.4 84.2 Total other accrued liabilities $ 391.5 $ 349.2

Rental expense and commitments

Rental expense and commitments (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of Rental Expense and Income from Subleases	Rental expense and income from subleases for the three years ended December 31, 2017 were as follows: Year ended December 31, 2017 2016 2015 Rental expense, less income from subleases $ 71.7 $ 77.4 $ 80.6 Income from subleases $ 4.4 $ 7.8 $ 9.1
Schedule of Minimum Net Rental Commitments Under Noncancelable Operating Leases	Minimum net rental commitments under noncancelable operating leases, including idle leases, outstanding at December 31, 2017 , substantially all of which relate to real properties, were as follows: Year 2018 $ 47.4 2019 41.3 2020 32.9 2021 21.5 2022 16.2 Thereafter 39.4 Total $ 198.7

Financial instruments and con40

Financial instruments and concentration of credit risks (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Foreign Exchange Forward Contracts by Balance Sheet Location	The following table summarizes the fair value of the company’s foreign exchange forward contracts as of December 31, 2017 and 2016 . As of December 31, 2017 2016 Balance Sheet Location Prepaid expenses and other current assets $ 4.9 $ 2.4 Other accrued liabilities 1.6 1.9 Total fair value $ 3.3 0.5 $ 0.5
Gains and Losses Recognized on Foreign Exchange Forward Contracts	The following table summarizes the location and amount of gains and losses recognized on foreign exchange forward contracts for the three years ended December 31, 2017 . Year Ended December 31, 2017 2016 2015 Statement of Income Location Other income (expense), net $ 27.5 $ (29.1 ) $ 15.6

Segment information (Tables)

Segment information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Customer Revenue by Classes of Similar Products or Services	Customer revenue by classes of similar products or services, by segment, is presented below: Year ended December 31, 2017 2016 2015 Services Cloud & infrastructure services $ 1,317.0 $ 1,352.9 $ 1,513.1 Application services 808.3 859.0 868.9 BPO services 202.9 194.4 223.6 Total Services 2,328.2 2,406.3 2,605.6 Technology 413.6 414.4 409.5 Total customer revenue $ 2,741.8 $ 2,820.7 $ 3,015.1
Reconciliation of Segment Operating Income to Consolidated Income (Loss) Before Income Taxes	Presented below is a reconciliation of segment operating income to consolidated income (loss) before income taxes: Year ended December 31, 2017 2016 2015 Total segment operating income $ 235.4 $ 208.4 $ 174.9 Interest expense (52.8 ) (27.4 ) (11.9 ) Other income (expense), net (23.9 ) 0.3 8.2 Cost reduction charges (a) (135.0 ) (82.1 ) (118.5 ) Corporate and eliminations (95.8 ) (78.7 ) (111.5 ) Total income (loss) before income taxes $ (72.1 ) $ 20.5 $ (58.8 ) (a) Year ended December 31, 2017 excludes $11.8 million for net foreign currency losses related to exiting foreign countries which are reported in Other income (expense), net in the consolidated statements of income.
Reconciliation of Total Business Segment Assets to Consolidated Assets	Presented below is a reconciliation of total business segment assets to consolidated assets: As of December 31, 2017 2016 2015 Total segment assets $ 1,364.5 $ 1,339.0 $ 1,486.0 Cash and cash equivalents 733.9 370.6 365.2 Deferred income taxes 119.9 146.1 127.4 Prepaid postretirement assets 148.3 33.3 45.1 Other corporate assets 175.8 132.6 106.3 Total assets $ 2,542.4 $ 2,021.6 $ 2,130.0
Summary of Operations by Business Segment	A summary of the company’s operations by business segment for 2017 , 2016 and 2015 is presented below: Total Corporate Services Technology 2017 Customer revenue $ 2,741.8 $ — $ 2,328.2 $ 413.6 Intersegment — (25.9 ) — 25.9 Total revenue $ 2,741.8 $ (25.9 ) $ 2,328.2 $ 439.5 Operating income (loss) $ 4.6 $ (230.8 ) $ 64.8 $ 170.6 Depreciation and amortization 156.5 — 84.6 71.9 Total assets 2,542.4 1,177.9 985.9 378.6 Capital expenditures 176.5 4.3 102.7 69.5 2016 Customer revenue $ 2,820.7 $ — $ 2,406.3 $ 414.4 Intersegment — (22.6 ) — 22.6 Total revenue $ 2,820.7 $ (22.6 ) $ 2,406.3 $ 437.0 Operating income (loss) $ 47.6 $ (160.8 ) $ 46.9 $ 161.5 Depreciation and amortization 155.6 — 81.8 73.8 Total assets 2,021.6 682.6 963.3 375.7 Capital expenditures 147.1 3.0 74.8 69.3 2015 Customer revenue $ 3,015.1 $ — $ 2,605.6 $ 409.5 Intersegment — (49.0 ) 0.1 48.9 Total revenue $ 3,015.1 $ (49.0 ) $ 2,605.7 $ 458.4 Operating income (loss) $ (55.1 ) $ (230.0 ) $ 61.2 $ 113.7 Depreciation and amortization 180.1 — 104.8 75.3 Total assets 2,130.0 644.0 1,081.7 404.3 Capital expenditures 213.7 1.9 143.3 68.5
Revenue by Geographic Segment	Geographic information about the company’s revenue, which is principally based on location of the selling organization, properties and outsourcing assets, is presented below: Year ended December 31, 2017 2016 2015 Revenue United States $ 1,257.0 $ 1,309.3 $ 1,454.9 United Kingdom 315.8 348.0 375.8 Other foreign 1,169.0 1,163.4 1,184.4 Total Revenue $ 2,741.8 $ 2,820.7 $ 3,015.1 Properties, net United States $ 85.8 $ 91.4 $ 96.9 United Kingdom 16.7 15.1 18.8 Other foreign 40.0 38.8 38.1 Total Properties, net $ 142.5 $ 145.3 $ 153.8 Outsourcing assets, net United States $ 81.1 $ 105.1 $ 119.4 United Kingdom 89.9 39.0 36.6 Other foreign 31.3 28.4 26.0 Total Outsourcing assets, net $ 202.3 $ 172.5 $ 182.0

Employee plans (Tables)

Employee plans (Tables)	12 Months Ended
	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair Value Assumptions on Stock Options	The fair value of stock option awards granted in 2016 and 2015 was estimated using the Black-Scholes option pricing model with the following assumptions and weighted-average fair values as follows: Year Ended December 31, 2016 2015 Weighted-average fair value of grant $ 4.53 $ 8.92 Risk-free interest rate 1.29 % 1.28 % Expected volatility 51.30 % 45.46 % Expected life of options in years 4.90 4.92 Expected dividend yield — —
Summary of Stock Option Activity	A summary of stock option activity for the year ended December 31, 2017 follows (shares in thousands): Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (years) Aggregate Intrinsic Value ($ in millions) Outstanding at December 31, 2016 2,099 $ 25.41 Granted — — Exercised (1 ) 10.65 Forfeited and expired (340 ) 20.59 Outstanding at December 31, 2017 1,758 26.35 1.56 $ — Expected to vest at December 31, 2017 198 23.20 3.42 $ — Exercisable at December 31, 2017 1,558 26.76 1.33 $ —
Summary of Restricted Stock Unit Activity	A summary of restricted stock unit activity for the year ended December 31, 2017 follows (shares in thousands): Restricted Stock Units Weighted-Average Grant-Date Fair Value Outstanding at December 31, 2016 1,454 $ 12.68 Granted 1,042 13.85 Vested (555 ) 13.31 Forfeited and expired (253 ) 11.88 Outstanding at December 31, 2017 1,688 13.39
Schedule of Accumulated Benefit Obligation in Excess of Plan Assets	Information for defined benefit retirement plans with an accumulated benefit obligation in excess of plan assets at December 31, 2017 and 2016 follows: As of December 31, 2017 2016 Accumulated benefit obligation $ 7,151.7 $ 7,551.8 Fair value of plan assets 5,227.0 5,357.2
Schedule of Projected Benefit Obligation in Excess of Plan Assets	Information for defined benefit retirement plans with a projected benefit obligation in excess of plan assets at December 31, 2017 and 2016 follows: As of December 31, 2017 2016 Projected benefit obligation $ 7,153.4 $ 7,555.2 Fair value of plan assets 5,227.0 5,357.2
Schedule of Weighted-Average Assumptions	Weighted-average assumptions used to determine benefit obligation at December 31 were as follows: Year ended December 31, 2017 2016 2015 Discount rate 5.30 % 5.53 % 5.61 %
Company's Investment Policy Targets and Ranges for Each Asset Category	The company’s investment policy targets and ranges for each asset category are as follows: U.S. International Asset Category Target Range Target Range Equity securities 58 % 52-64% 24 % 18-30% Debt securities 36 % 33-39% 60 % 53-66% Real estate 6 % 3-9% 1 % 0-3% Cash — % 0-5% 1 % 0-5% Other — % — % 14 % 7-21%
Assumed Health Care Cost Trend Rates	Assumed health care cost trend rates at December 31, 2017 2016 Health care cost trend rate assumed for next year 6.6 % 5.8 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.8 % 4.8 % Year that the rate reaches the ultimate trend rate 2023 2023
Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates	A one-percentage-point change in assumed health care cost trend rates would have the following effects: 1-Percentage- Point Increase 1-Percentage- Point Decrease Effect on service and interest cost $ 0.1 $ (0.1 ) Effect on postretirement benefit obligation 2.0 (1.7 )
Schedule of Plans' Assets (Liabilities) at Fair Value	The following table sets forth by level, within the fair value hierarchy, the plans’ assets (liabilities) at fair value at December 31, 2017 . U.S. Plans International Plans As of December 31, 2017 Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Pension plans Equity Securities Common Stocks $ 1,465.1 $ 1,461.9 $ 3.2 $ — $ — $ — $ — $ — Commingled Funds 584.4 584.4 84.0 84.0 Debt Securities U.S. Govt. Securities 139.8 139.8 Other Fixed Income 830.6 830.6 254.1 2.6 251.5 Insurance Contracts 135.8 135.8 Commingled Funds 267.5 267.5 Real Estate Real Estate Investment Trusts 113.5 113.5 1.4 0.4 1.0 Other Derivatives 2.6 13.1 (10.5 ) 1.2 1.2 Commingled Funds 357.1 357.1 Pooled Funds 228.0 228.0 29.2 29.2 Cash 34.8 34.8 25.1 25.1 Receivables 58.1 58.1 19.9 19.9 Payables (116.7 ) (116.7 ) (1.5 ) (1.5 ) Total plan assets in fair value hierarchy $ 3,340.2 $ 1,704.5 $ 1,635.7 $ — $ 1,173.8 $ 46.5 $ 991.5 $ 135.8 Plan assets measured using NAV as a practical expedient (a): Commingled Funds Equity $ — $ 780.7 Debt 19.8 837.7 Other 105.1 25.2 Private Real Estate 112.4 16.5 Private Equity 0.9 — Total pension plan assets $ 3,578.4 $ 2,833.9 Other postretirement plans Insurance Contracts $ 7.6 $ 7.6 (a) Investments measured at fair value using NAV as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets. The following table sets forth by level, within the fair value hierarchy, the plans’ assets (liabilities) at fair value at December 31, 2016 . U.S. Plans International Plans As of December 31, 2016 Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Pension plans Equity Securities Common Stocks $ 1,443.1 $ 1,438.3 $ 4.8 $ — $ — $ — $ — $ — Commingled Funds 517.9 517.9 76.0 76.0 Debt Securities U.S. Govt. Securities 158.5 158.5 Other Fixed Income 812.4 812.4 241.4 0.5 240.9 Insurance Contracts 116.2 116.2 Commingled Funds 242.8 242.8 Real Estate Real Estate Investment Trusts 156.2 156.2 1.6 1.2 0.4 Other Derivatives 3.1 (1.1 ) 4.2 4.9 4.9 Commingled Funds 294.5 294.5 Pooled Funds 272.0 272.0 6.7 6.7 Cash 12.2 12.2 11.4 11.4 Receivables 107.2 107.2 Payables (195.3 ) (195.3 ) Total plan assets in fair value hierarchy $ 3,287.3 $ 1,676.0 $ 1,611.3 $ — $ 995.5 $ 13.1 $ 866.2 $ 116.2 Plan assets measured using NAV as a practical expedient (a): Commingled Funds Equity $ — $ 726.7 Debt 18.6 640.0 Other 104.6 25.8 Private Real Estate 40.5 41.7 Private Equity 1.1 — Total pension plan assets $ 3,452.1 $ 2,429.7 Other postretirement plans Insurance Contracts $ 7.9 $ 7.9 (a) Investments measured at fair value using NAV as a practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table for these investments are included to permit reconciliation of the fair value hierarchy to the total plan assets.
Summary of Changes in the Fair Value of the Plans' Level 3 Assets	The following table sets forth a summary of changes in the fair value of the plans’ Level 3 assets for the year ended December 31, 2017 . January 1, 2017 Realized gains (losses) Purchases or acquisitions Sales or dispositions Currency and unrealized gains (losses) relating to instruments still held at December 31, 2017 December 31, 2017 U.S. plans Other postretirement plans Insurance Contracts $ 7.9 $ (0.2 ) $ 0.2 $ (0.3 ) $ — $ 7.6 International pension plans Insurance Contracts $ 116.2 $ — $ 10.8 $ (11.4 ) $ 20.2 $ 135.8 The following table sets forth a summary of changes in the fair value of the plans’ Level 3 assets for the year ended December 31, 2016 . January 1, 2016 Realized gains (losses) Purchases or acquisitions Sales or dispositions Currency and unrealized gains (losses) relating to instruments still held at December 31, 2016 December 31, 2016 U.S. plans Other postretirement plans Insurance Contracts $ 7.7 $ (0.3 ) $ 0.5 $ — $ — $ 7.9 International pension plans Insurance Contracts $ 120.6 $ — $ 4.7 $ (11.0 ) $ 1.9 $ 116.2
Schedule of Additional Information About Plan Assets Valued Using Net Asset Value	The following table presents additional information about plan assets valued using the net asset value as a practical expedient within the fair value hierarchy table. 2017 2016 Fair Value Unfunded Commit-ments Redemption Frequency Redemption Notice Period Range Fair Value Unfunded Commit-ments Redemption Frequency Redemption Notice Period Range U.S. plans Commingled Funds Debt $ 19.8 $ — Daily 5 days $ 18.6 $ — Daily 5 days Other 105.1 — Monthly 5 days 104.6 — Monthly 5 days Private Real Estate (a) 112.4 — Quarterly Up to 90 days 40.5 — Quarterly 60 days Private Equity (b) 0.9 — 1.1 — Total $ 238.2 $ — $ 164.8 $ — International pension plans Commingled Funds Equity $ 780.7 $ — Weekly, Monthly Up to 30 days $ 726.7 $ — Weekly, Monthly Up to 90 days Debt 837.7 — Weekly, Biweekly, Bimonthly, Monthly Up to 30 days 640.0 — Weekly, Biweekly, Bimonthly, Monthly Up to 90 days Other 25.2 — Monthly Up to 30 days 25.8 — Monthly, Quarterly Up to 90 days Private Real Estate 16.5 — Monthly Up to 90 days 41.7 — Monthly, Quarterly Up to 90 days Total $ 1,660.1 $ — $ 1,434.2 $ — (a) Includes investments in private real estate funds and limited partnerships. The funds invest in U.S. real estate and allow redemptions quarterly, though queues, restrictions, and gates may extend the period. The limited partnerships include investments in primarily U.S. real estate, and can never be redeemed. The partnerships are all currently being wound up, and are expected to make all distributions over the next three years . (b) Includes investments in limited partnerships, which invest primarily in U.S. buyouts and venture capital. The investments can never be redeemed. The partnerships are all currently being wound up, and are expected to make all distributions over the next three years .
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Funded Status of the Plan and Amounts Recognized in Consolidated Balance Sheet	Retirement plans’ funded status and amounts recognized in the company’s consolidated balance sheets at December 31, 2017 and 2016 follows: U.S. Plans International Plans As of December 31, 2017 2016 2017 2016 Change in projected benefit obligation Benefit obligation at beginning of year $ 4,972.0 $ 5,231.4 $ 3,076.2 $ 2,987.8 Service cost — — 5.1 7.4 Interest cost 211.3 231.3 72.8 87.8 Plan participants’ contributions — — 1.9 2.3 Plan amendment — — (52.5 ) — Plan curtailment — — (2.2 ) (3.7 ) Actuarial loss (gain) 177.0 87.2 (93.8 ) 502.2 Benefits paid (358.7 ) (577.9 ) (117.1 ) (110.0 ) Foreign currency translation adjustments — — 299.3 (397.6 ) Benefit obligation at end of year $ 5,001.6 $ 4,972.0 $ 3,189.7 $ 3,076.2 Change in plan assets Fair value of plan assets at beginning of year $ 3,452.1 $ 3,759.4 $ 2,429.7 $ 2,496.8 Actual return on plan assets 424.0 211.8 172.3 287.7 Employer contribution 61.0 58.8 77.4 73.7 Plan participants’ contributions — — 1.9 2.3 Benefits paid (358.7 ) (577.9 ) (117.1 ) (110.0 ) Foreign currency translation and other adjustments — — 269.7 (320.8 ) Fair value of plan assets at end of year $ 3,578.4 $ 3,452.1 $ 2,833.9 $ 2,429.7 Funded status at end of year $ (1,423.2 ) $ (1,519.9 ) $ (355.8 ) $ (646.5 ) Amounts recognized in the consolidated balance sheets consist of: Prepaid postretirement assets $ — $ — $ 147.4 $ 31.9 Other accrued liabilities (6.8 ) (6.7 ) (0.2 ) (0.2 ) Long-term postretirement liabilities (1,416.4 ) (1,513.2 ) (503.0 ) (678.2 ) Total funded status $ (1,423.2 ) $ (1,519.9 ) $ (355.8 ) $ (646.5 ) Accumulated other comprehensive loss, net of tax Net loss $ 2,690.6 $ 2,828.8 $ 1,067.8 $ 1,144.7 Prior service credit $ (39.8 ) $ (42.4 ) $ (69.8 ) $ (27.7 ) Accumulated benefit obligation $ 5,001.6 $ 4,972.0 $ 3,188.0 $ 3,072.1
Components of Net Periodic Cost	Net periodic pension cost (income) for 2017 , 2016 and 2015 includes the following components: U.S. Plans International Plans Year ended December 31, 2017 2016 2015 2017 2016 2015 Service cost $ — $ — $ — $ 5.1 $ 7.4 $ 8.7 Interest cost 211.3 231.3 224.1 72.8 87.8 94.1 Expected return on plan assets (235.2 ) (253.1 ) (254.8 ) (127.5 ) (139.5 ) (155.4 ) Amortization of prior service credit (2.5 ) (2.5 ) (2.4 ) (2.4 ) (3.0 ) (1.9 ) Recognized net actuarial loss 126.4 116.0 132.7 49.8 40.3 63.6 Curtailment gain — — — (5.4 ) (2.0 ) — Net periodic pension cost (income) $ 100.0 $ 91.7 $ 99.6 $ (7.6 ) $ (9.0 ) $ 9.1
Schedule of Weighted-Average Assumptions	Weighted-average assumptions used to determine net periodic pension cost for the years ended December 31 were as follows: U.S. Plans International Plans Year ended December 31, 2017 2016 2015 2017 2016 2015 Discount rate 4.38 % 4.56 % 4.09 % 2.34 % 3.30 % 3.05 % Rate of compensation increase N/A N/A N/A 1.66 % 1.66 % 1.68 % Expected long-term rate of return on assets 6.80 % 6.80 % 6.80 % 5.30 % 5.99 % 6.45 % Weighted-average assumptions used to determine benefit obligations at December 31 were as follows: Discount rate 3.87 % 4.38 % 4.56 % 2.24 % 2.34 % 3.30 % Rate of compensation increase N/A N/A N/A 1.55 % 1.66 % 1.68 %
Expected Future Benefit Payments	As of December 31, 2017 , the following benefit payments, which reflect expected future service where applicable, are expected to be paid from the defined benefit pension plans: Year ending December 31, U.S. International 2018 $ 364.4 $ 98.7 2019 361.4 102.8 2020 359.3 106.9 2021 357.6 110.3 2022 355.1 117.5 2023 - 2027 1,693.6 642.5
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Funded Status of the Plan and Amounts Recognized in Consolidated Balance Sheet	A reconciliation of the benefit obligation, fair value of the plan assets and the funded status of the postretirement benefit plan at December 31, 2017 and 2016 , follows: As of December 31, 2017 2016 Change in accumulated benefit obligation Benefit obligation at beginning of year $ 120.1 $ 131.5 Service cost 0.5 0.4 Interest cost 5.6 6.2 Plan participants’ contributions 3.5 3.8 Amendments (7.4 ) (3.3 ) Actuarial gain (4.3 ) (1.4 ) Federal drug subsidy 0.3 1.4 Benefits paid (15.7 ) (16.9 ) Foreign currency translation and other adjustments 0.6 (1.6 ) Benefit obligation at end of year $ 103.2 $ 120.1 Change in plan assets Fair value of plan assets at beginning of year $ 7.9 $ 7.7 Actual return on plan assets (0.3 ) (0.3 ) Employer contributions 12.2 13.6 Plan participants’ contributions 3.5 3.8 Benefits paid (15.7 ) (16.9 ) Fair value of plan assets at end of year $ 7.6 $ 7.9 Funded status at end of year $ (95.6 ) $ (112.2 ) Amounts recognized in the consolidated balance sheets consist of: Prepaid postretirement assets $ 0.9 $ 1.4 Other accrued liabilities (11.5 ) (12.4 ) Long-term postretirement liabilities (85.0 ) (101.2 ) Total funded status $ (95.6 ) $ (112.2 ) Accumulated other comprehensive loss, net of tax Net loss $ 14.9 $ 19.0 Prior service credit (9.8 ) (3.2 )
Components of Net Periodic Cost	Net periodic postretirement benefit cost for 2017 , 2016 and 2015 , follows: Year ended December 31, 2017 2016 2015 Service cost $ 0.5 $ 0.4 $ 0.6 Interest cost 5.6 6.2 6.9 Expected return on assets (0.5 ) (0.4 ) (0.4 ) Amortization of prior service cost (0.7 ) — 1.1 Recognized net actuarial loss 0.8 0.5 1.8 Net periodic benefit cost $ 5.7 $ 6.7 $ 10.0
Schedule of Weighted-Average Assumptions	Weighted-average assumptions used to determine net periodic postretirement benefit cost for the years ended December 31 were as follows: Year ended December 31, 2017 2016 2015 Discount rate 5.53 % 5.61 % 5.27 % Expected return on plan assets 5.50 % 5.50 % 5.50 %
Expected Future Benefit Payments	As of December 31, 2017 , the following benefits are expected to be paid to or from the company’s postretirement plan: Year ending December 31, Gross Medicare Part D Receipts Gross Expected Payments 2018 $ 0.1 $ 12.7 2019 — 10.5 2020 — 10.0 2021 — 9.4 2022 — 8.8 2023 – 2027 — 34.4

Stockholders' equity (Tables)

Stockholders' equity (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive income (loss) as of December 31, 2017 , 2016 and 2015 , is as follows: Total Translation Adjustments Postretirement Plans Balance at December 31, 2014 $ (4,113.4 ) $ (737.8 ) $ (3,375.6 ) Other comprehensive income before reclassifications 346.2 (96.0 ) 442.2 Amounts reclassified from accumulated other comprehensive income (178.1 ) — (178.1 ) Current period other comprehensive income 168.1 (96.0 ) 264.1 Balance at December 31, 2015 (3,945.3 ) (833.8 ) (3,111.5 ) Other comprehensive income before reclassifications (64.9 ) (93.3 ) 28.4 Amounts reclassified from accumulated other comprehensive income (142.6 ) — (142.6 ) Current period other comprehensive income (207.5 ) (93.3 ) (114.2 ) Balance at December 31, 2016 (4,152.8 ) (927.1 ) (3,225.7 ) Other comprehensive income before reclassifications 506.8 121.9 384.9 Amounts reclassified from accumulated other comprehensive income (169.8 ) (11.8 ) (158.0 ) Current period other comprehensive income 337.0 110.1 226.9 Balance at December 31, 2017 $ (3,815.8 ) $ (817.0 ) $ (2,998.8 )
Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss)	Amounts reclassified out of accumulated other comprehensive income for the three years ended December 31, 2017 are as follows: Year ended December 31, 2017 2016 2015 Translation Adjustments: Adjustment for substantial completion of liquidation of foreign subsidiaries (a) $ (11.8 ) $ — $ — Postretirement Plans: Amortization of prior service cost (b) 5.6 5.6 3.1 Amortization of actuarial losses (b) (174.1 ) (155.2 ) (189.7 ) Curtailment gain (b) 5.4 2.0 — Total before tax (174.9 ) (147.6 ) (186.6 ) Income tax benefit 5.1 5.0 8.5 Total reclassifications for the period $ (169.8 ) $ (142.6 ) $ (178.1 ) (a) Reported in Other income (expense), net in the consolidated statements of income (b) These items are included in net periodic postretirement cost (see Note 16).
Changes in Common Stock and Treasury Stock	The following table summarizes the changes in shares of common stock and treasury stock during the three years ended December 31, 2017 : Common Stock Treasury Stock Balance at December 31, 2014 52.4 2.7 Stock-based compensation 0.2 — Balance at December 31, 2015 52.6 2.7 Stock-based compensation 0.2 — Balance at December 31, 2016 52.8 2.7 Stock-based compensation 0.6 0.2 Balance at December 31, 2017 53.4 2.9

Quarterly financial informati44

Quarterly financial information (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	First Quarter Second Quarter Third Quarter Fourth Quarter Year 2017 Revenue $ 664.5 $ 666.2 $ 666.3 $ 744.8 $ 2,741.8 Gross profit 120.2 102.5 86.1 169.5 478.3 Income (loss) before income taxes (16.8 ) (42.3 ) (40.4 ) 27.4 (72.1 ) Net income (loss) attributable to Unisys Corporation common shareholders (32.7 ) (42.0 ) (41.1 ) 50.5 (65.3 ) Earnings (loss) per common share attributable to Unisys Corporation Basic (0.65 ) (0.83 ) (0.81 ) 1.00 (1.30 ) Diluted (0.65 ) (0.83 ) (0.81 ) 0.76 (1.30 ) 2016 Revenue $ 666.8 $ 748.9 $ 683.3 $ 721.7 $ 2,820.7 Gross profit 98.5 178.3 121.6 160.2 558.6 Income (loss) before income taxes (33.2 ) 44.3 (15.2 ) 24.6 20.5 Net income (loss) attributable to Unisys Corporation common shareholders (39.9 ) 21.6 (28.2 ) (1.2 ) (47.7 ) Earnings (loss) per common share attributable to Unisys Corporation Basic (0.80 ) 0.43 (0.56 ) (0.02 ) (0.95 ) Diluted (0.80 ) 0.36 (0.56 ) (0.02 ) (0.95 ) In the first, second, third and fourth quarters of 2017, the company recorded pretax cost-reduction and other charges of $25.4 million , $27.5 million , $46.1 million and $47.8 million , respectively. See Note 3, “Cost reduction actions,” of the Notes to Consolidated Financial Statements. In the first, second, third and fourth quarters of 2016, the company recorded pretax cost-reduction and other charges of $26.9 million , $10.2 million , $31.9 million and $13.1 million , respectively. See Note 3, “Cost reduction actions,” of the Notes to Consolidated Financial Statements. The individual quarterly per-share amounts may not total to the per-share amount for the full year because of accounting rules governing the computation of earnings per share.

Summary of significant accoun45

Summary of significant accounting policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014	[2]
Accounting Policies [Abstract]
Cash and cash equivalents	$ 733.9	$ 370.6		$ 365.2
Restricted cash	30.2	30.5	[1]
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows	$ 764.1	$ 401.1	[2]	$ 396.8	[2]	$ 530.2
[1]	Amounts were changed to conform to the current-year presentation. See Note 5
[2]	Amounts were changed to conform to the current-year presentation. See Note 5

Summary of significant accoun46

Summary of significant accounting policies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Advertising costs incurred	$ 1.6	$ 2.7	$ 4.9
Maximum estimated revenue-producing lives of computer software products from the date of release	3 years
Period of recognition in changes in fair value of plan assets	4 years
Intelligent Processing Solutions Ltd.
Property, Plant and Equipment [Line Items]
Percentage of ownership interest	51.00%
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	20 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	50 years
Machinery and office equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	4 years
Machinery and office equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	7 years
Rental equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	4 years
Internal-use software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Internal-use software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years

Earnings per common share - Com

Earnings per common share - Computation of Earnings Per Common Share Attributable to Unisys Corporation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Basic earnings (loss) per common share computation:
Net loss attributable to Unisys Corporation common shareholders									$ (65.3)	$ (47.7)	$ (109.9)
Weighted average shares (in shares)									50,409	50,060	49,905
Basic loss per common share (in dollars per share)	$ 1	$ (0.81)	$ (0.83)	$ (0.65)	$ (0.02)	$ (0.56)	$ 0.43	$ (0.80)	$ (1.30)	$ (0.95)	$ (2.20)
Diluted earnings (loss) per common share computation:
Net loss attributable to Unisys Corporation for diluted earnings per share									$ (65.3)	$ (47.7)	$ (109.9)
Weighted average shares (in shares)									50,409	50,060	49,905
Diluted loss per common share (in dollars per share)	$ 0.76	$ (0.81)	$ (0.83)	$ (0.65)	$ (0.02)	$ (0.56)	$ 0.36	$ (0.80)	$ (1.30)	$ (0.95)	$ (2.20)
Stock options and restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive weighted-average securities (in shares)									2,206	3,553	2,915
5.50% convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive weighted-average securities (in shares)									21,868	17,230	0
Convertible senior notes interest rate	5.50%								5.50%

Cost reduction actions - Additi

Cost reduction actions - Additional Information (Detail) $ in Millions	3 Months Ended								12 Months Ended			36 Months Ended
	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2017USD ($)employee	Dec. 31, 2016USD ($)employee	Dec. 31, 2015USD ($)employee	Dec. 31, 2017USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 47.8	$ 46.1	$ 27.5	$ 25.4	$ 13.1	$ 31.9	$ 10.2	$ 26.9	$ 146.8	$ 82.1	$ 118.5	$ 347.4
Severance costs									117.9	62.6	78.8
Other expenses related to the cost reduction effort									28.9	19.5	39.7
Asset impairment charges											20.2
Cost of revenue | Services
Restructuring Cost and Reserve [Line Items]
Restructuring charges									99.6	42.4	52.3
Cost of revenue | Technology
Restructuring Cost and Reserve [Line Items]
Restructuring charges									0.4		0.3
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges									33.6	38	53.5
Research and development expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges									1.4	1.7	12.4
Other income (expense), net
Restructuring Cost and Reserve [Line Items]
Restructuring charges									11.8
Idle leased facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges									4.2	1.4	0
Other expenses related to the cost reduction effort									4.7	1.4
Contract amendment and termination
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost reduction effort									5.4	4.1
Professional fees and other expenses related to the cost reduction effort
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost reduction effort									5.2	13.3	19.5
Net asset sales and write-offs
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost reduction effort									1.8	0.7
Net foreign currency translation adjustment
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost reduction effort									11.8
Net foreign currency translation adjustment | Other income (expense), net
Restructuring Cost and Reserve [Line Items]
Restructuring charges									11.8
United States
Restructuring Cost and Reserve [Line Items]
Severance costs									$ 9.4	$ 8.3	$ 27.9
Number of employees | employee									542	351	700
United States | Changes in estimates
Restructuring Cost and Reserve [Line Items]
Severance costs									$ (1.3)	$ (1.3)
Non-US
Restructuring Cost and Reserve [Line Items]
Severance costs									$ 109.4	$ 58.6	$ 50.9
Number of employees | employee									2,274	1,048	782
Non-US | Changes in estimates
Restructuring Cost and Reserve [Line Items]
Severance costs									$ (7.8)	$ (3)
Non-US | Additional benefits provided in 2017
Restructuring Cost and Reserve [Line Items]
Severance costs									$ 8.2

Cost reduction actions - Reconc

Cost reduction actions - Reconciliation of Liabilities and Expected Future Payments (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended				36 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, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Charges for work-force reductions / Additional provisions	$ 47.8	$ 46.1	$ 27.5	$ 25.4	$ 13.1	$ 31.9	$ 10.2	$ 26.9		$ 146.8	$ 82.1	$ 118.5	$ 347.4
Work-Force Reductions | United States
Restructuring Reserve [Roll Forward]
Balance at beginning of period				1.8				4.2	$ 3.9	1.8	4.2
Charges for work-force reductions / Additional provisions										9.4	8.3	27.9
Payments										(6)	(9.4)	(23.7)
Changes in estimates										(1.3)	(1.3)
Translation adjustments										0	0
Balance at end of period	3.9				1.8					3.9	1.8	4.2	3.9
In 2,018										6	9.4	23.7
Work-Force Reductions | United States | Scenario, Forecast
Restructuring Reserve [Roll Forward]
Payments									(3.9)
In 2,018									3.9
Expected future payments on balance at December 31, 2017									0
Work-Force Reductions | International
Restructuring Reserve [Roll Forward]
Balance at beginning of period				33.4				28.8	109.6	33.4	28.8
Charges for work-force reductions / Additional provisions										117.6	58.6	50.9
Payments										(41.3)	(49.9)	(21.6)
Changes in estimates										(7.8)	(3)
Translation adjustments										7.7	(1.1)	(0.5)
Balance at end of period	109.6				33.4					109.6	33.4	28.8	109.6
In 2,018										41.3	49.9	21.6
Work-Force Reductions | International | Scenario, Forecast
Restructuring Reserve [Roll Forward]
Payments									(82)
In 2,018									82
Expected future payments on balance at December 31, 2017									27.6
Idle Leased Facilities Costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period				1.4				0	4.3	1.4	0
Charges for work-force reductions / Additional provisions										4.2	1.4	0
Payments										(2)	0	0
Changes in estimates										0.5	0
Translation adjustments										0.2	0	0
Balance at end of period	4.3				1.4					4.3	1.4	0	4.3
In 2,018										2	0	0
Idle Leased Facilities Costs | Scenario, Forecast
Restructuring Reserve [Roll Forward]
Payments									(1.8)
In 2,018									1.8
Expected future payments on balance at December 31, 2017									2.5
Total
Restructuring Reserve [Roll Forward]
Balance at beginning of period				$ 36.6				$ 33	117.8	36.6	33
Charges for work-force reductions / Additional provisions										131.2	68.3	78.8
Payments										(49.3)	(59.3)	(45.3)
Changes in estimates										(8.6)	(4.3)
Translation adjustments										7.9	(1.1)	(0.5)
Balance at end of period	$ 117.8				$ 36.6					117.8	36.6	33	$ 117.8
In 2,018										$ 49.3	$ 59.3	$ 45.3
Total | Scenario, Forecast
Restructuring Reserve [Roll Forward]
Payments									(87.7)
In 2,018									87.7
Expected future payments on balance at December 31, 2017									$ 30.1

Goodwill (Details)

Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment	$ 0
Goodwill [Line Items]
Goodwill	180,800,000	$ 178,600,000	$ 177,400,000
Services
Goodwill [Line Items]
Goodwill	72,100,000	$ 69,900,000	$ 68,700,000
BPO services | Services
Goodwill [Line Items]
Goodwill	$ 10,800,000

Goodwill - Changes in Carrying

Goodwill - Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Balance at beginning of year	$ 178.6	$ 177.4
Translation adjustments	2.2	1.2
Balance at end of year	180.8	178.6
Services
Goodwill [Roll Forward]
Balance at beginning of year	69.9	68.7
Translation adjustments	2.2	1.2
Balance at end of year	72.1	69.9
Technology
Goodwill [Roll Forward]
Balance at beginning of year	108.7	108.7
Translation adjustments	0	0
Balance at end of year	$ 108.7	$ 108.7

Recent accounting pronounceme52

Recent accounting pronouncements and accounting changes - Schedule of Amounts Reclassified in Consolidated Statements of Cash Flows (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Cash flows from operating activities
Other assets		$ (27.5)	$ 16.5	[1]	$ 18.1	[1]
Cash flows from investing activities
Other		(0.8)	(0.9)	[1]	7	[1]
Effect of exchange rate changes on cash, cash equivalents and restricted cash		19.2	(14.7)	[1]	(47.6)	[1]
Cash, cash equivalents and restricted cash, beginning of year	[1]	401.1	396.8		530.2
Cash, cash equivalents and restricted cash, end of year		764.1	401.1	[1]	396.8	[1]
Accounting Standards Update 2016-18
Cash flows from operating activities
Other assets			(1.9)		2.6
Cash flows from investing activities
Other			1.6		(2.3)
Effect of exchange rate changes on cash, cash equivalents and restricted cash			(0.8)		(4.6)
Cash, cash equivalents and restricted cash, beginning of year		$ 30.5	31.6		35.9
Cash, cash equivalents and restricted cash, end of year			$ 30.5		$ 31.6
[1]	Amounts were changed to conform to the current-year presentation. See Note 5

Recent accounting pronounceme53

Recent accounting pronouncements and accounting changes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment	$ 4.4
Reclassification from operating activities, Other assets	27.5	$ (16.5)	[1]	$ (18.1)	[1]
Reclassification to investing activities, Other	(0.8)	(0.9)	[1]	7	[1]
Reclassification from operating activities, Accounts payable and other accrued liabilities	48.6	7.5	[1]	(60.3)	[1]
Reclassification to financing activities, Other	2.3	0.4	[1]	0.8	[1]
Accounting Standards Update 2016-15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from operating activities, Other assets		1.5		1.1
Reclassification to investing activities, Other		1.5		1.1
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from operating activities, Accounts payable and other accrued liabilities		0.4		0.8
Reclassification to financing activities, Other		0.4		$ 0.8
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit cost, other than service cost	92.5	81.6
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment	$ 4.4
Accumulated Deficit | Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment		$ 4.4
[1]	Amounts were changed to conform to the current-year presentation. See Note 5

Accounts receivable - Additiona

Accounts receivable - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Revenue recognized in excess of billings on services contracts or unbilled accounts receivable	$ 109.4	$ 98
Unearned income deducted from accounts and notes receivable	12.5	7
Allowance for doubtful accounts	22	22.8
Provision expense for doubtful accounts reported in selling, general and administrative expenses	$ 3.1	$ 2.2	$ 3

Accounts receivable - Schedule

Accounts receivable - Schedule of Receivables Under Sales-Type Lease (Details) $ in Millions	Dec. 31, 2017USD ($)
Receivables [Abstract]
2,018	$ 45.5
2,019	25.8
2,020	16.3
2,021	10.8
2,022	9.7
Thereafter	19.1
Total	$ 127.2

Income taxes - Total Income Bef

Income taxes - Total Income Before Income Taxes and Provision for Income Taxes (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
Income (loss) before income taxes
United States									$ (152.7)	$ (88.3)	$ (130.6)
Foreign									80.6	108.8	71.8
Income (loss) before income taxes	$ 27.4	$ (40.4)	$ (42.3)	$ (16.8)	$ 24.6	$ (15.2)	$ 44.3	$ (33.2)	(72.1)	20.5	(58.8)
Current
United States									(42.8)	6.7	1
Foreign									33.9	47.7	42.2
State and local									0	0	0.3
Total									(8.9)	54.4	43.5
Deferred
Foreign									3.4	2.8	0.9
(Benefit) provision for income taxes									$ (5.5)	$ 57.2	$ 44.4

Income taxes - Reconciliation o

Income taxes - Reconciliation of the Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
United States statutory income tax provision (benefit)	$ (25.2)	$ 7.2	$ (20.6)
Income and losses for which no provision or benefit has been recognized	70.3	65.5	69.1
Foreign rate differential and other foreign tax expense	(11.3)	(21.1)	(15.9)
Income tax withholdings	16.8	22.8	12.5
Permanent items	(3)	(4.7)	(1.9)
Enacted rate changes	(0.4)	3.5	9.1
Change in uncertain tax positions	2.3	0.4	1.5
Change in valuation allowances due to changes in judgment	(4.6)	(16.4)	(5.4)
Income tax credits, U.S.	(50.4)	0	(4)
(Benefit) provision for income taxes	$ (5.5)	$ 57.2	$ 44.4

Income taxes - Additional Infor

Income taxes - Additional Information (Detail) - USD ($) $ in Millions	Apr. 01, 2020	Apr. 01, 2017	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Tax Credit Carryforward [Line Items]
Income tax benefit, due to Tax Cuts and Jobs Act					$ 50.4
Income tax benefit, due to Tax Cuts and Jobs Act, received in 2017					9.1
Income tax benefit, due to Tax Cuts and Jobs Act, receivable in 2018					7.2
Income tax benefit, due to Tax Cuts and Jobs Act, receivable between 2019-2022					34.1
Rate change in the company's income tax provision					(0.4)	$ 3.5	$ 9.1
U.S. Federal tax loss carryforwards					319.5
State and local tax loss carryforwards					250.7
Foreign tax loss carryforwards					267.4
Total tax loss carryforwards					837.6	889.6
Tax credit carryforwards					127
Unrecognized Deferred Income Tax Liability, Tax Cuts and Jobs Act					21.5
Cash paid, net of refunds					34.3	46.4	59.7
Penalties and interest accrued related to income tax liabilities					2.3	1.2
Utilization of tax attributes, annual limitation					70.6
Utilization of tax attributes, cumulative limitation					$ 416
Minimum
Tax Credit Carryforward [Line Items]
Expected change in ownership percentage					50.00%
2,018
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					$ 5.3
Tax credit carryforwards, set to expire					10.1
2,019
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					7.3
Tax credit carryforwards, set to expire					10.2
2,020
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					28.5
Tax credit carryforwards, set to expire					20.9
2,021
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					14.5
Tax credit carryforwards, set to expire					8.7
2,022
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					114
Tax credit carryforwards, set to expire					7.7
Thereafter
Tax Credit Carryforward [Line Items]
Tax loss carryforwards, set to expire					668
Tax credit carryforwards, set to expire					$ 69.4
United Kingdom
Tax Credit Carryforward [Line Items]
Rate change in the company's income tax provision						$ 3.5	$ 9.1
Income tax rate		18.00%	18.00%	20.00%
United Kingdom | Scenario, Forecast
Tax Credit Carryforward [Line Items]
Income tax rate	17.00%
India
Tax Credit Carryforward [Line Items]
Tax audit for the years					2,006
Brazil
Tax Credit Carryforward [Line Items]
Tax audit for the years					2,010

Income taxes - Significant Port

Income taxes - Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Tax loss carryforwards	$ 837.6	$ 889.6
Postretirement benefits	437.7	728.9
Foreign tax credit carryforwards	127	317.6
Other tax credit carryforwards	29.1	91.4
Deferred revenue	40.9	81
Employee benefits and compensation	35.2	49.1
Purchased capitalized software	22.2	32.6
Depreciation	24.5	28.3
Warranty, bad debts and other reserves	5.3	16.1
Capitalized costs	3.1	10.9
Other	39.3	27.7
Total deferred tax assets, gross	1,601.9	2,273.2
Valuation allowance	(1,441.1)	(2,084.6)
Total deferred tax assets	160.8	188.6
Deferred tax liabilities
Capitalized research and development	24.3	20.3
Other	25.8	28.4
Total deferred tax liabilities	50.1	48.7
Net deferred tax assets	$ 110.7	$ 139.9

Income taxes - Reconciliation60

Income taxes - Reconciliation of Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 35.8	$ 27.7	$ 35
Additions based on tax positions related to the current year	4.2	2.7	3.4
Changes for tax positions of prior years	(11.2)	12	(4)
Reductions as a result of a lapse of applicable statute of limitations	(2.7)	(2.8)	(3.4)
Settlements	(0.2)	(0.1)	(0.9)
Changes due to foreign currency	2	3.7	2.4
Balance at December 31	$ 27.9	$ 35.8	$ 27.7

Properties - Components of Prop

Properties - Components of Properties (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total properties	$ 898.8	$ 886.6
Land
Property, Plant and Equipment [Line Items]
Total properties	2.8	2.7
Buildings
Property, Plant and Equipment [Line Items]
Total properties	91.3	88.2
Machinery and office equipment
Property, Plant and Equipment [Line Items]
Total properties	601.7	591.7
Internal-use software
Property, Plant and Equipment [Line Items]
Total properties	157.4	145.9
Rental equipment
Property, Plant and Equipment [Line Items]
Total properties	$ 45.6	$ 58.1

Debt - Components of Long-term

Debt - Components of Long-term Debt (Details) - USD ($)	Dec. 31, 2017	May 08, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 637,100,000
Other debt	21,300,000		$ 16,100,000
Total	644,700,000		300,000,000
Less – current maturities	10,800,000		106,000,000
Total long-term debt	$ 633,900,000		194,000,000
5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Aggregate principal amount			1,000
Senior Notes | 10.75% senior secured notes due April 15, 2022
Debt Instrument [Line Items]
Interest rate	10.75%
Long-term debt	$ 429,600,000		$ 0
Aggregate principal amount	440,000,000
Debt Instrument, Unamortized Discount	$ 10,400,000
Senior Notes | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Interest rate	5.50%		5.50%
Long-term debt	$ 186,300,000		$ 179,100,000
Aggregate principal amount	213,500,000		213,500,000
Debt Instrument, Unamortized Discount	$ 27,200,000		34,400,000
Senior Notes | 6.25% senior notes due August 15, 2017
Debt Instrument [Line Items]
Interest rate	6.25%	6.25%
Long-term debt	$ 0		94,700,000
Capital Lease Obligations
Debt Instrument [Line Items]
Capital leases	$ 7,500,000		$ 10,100,000

Debt - Estimated Fair Values of

Debt - Estimated Fair Values of Long-term Debt (Details) - Senior Notes - USD ($) $ in Millions	Dec. 31, 2017	May 08, 2017	Dec. 31, 2016
10.75% senior secured notes due April 15, 2022
Debt Instrument [Line Items]
Interest rate	10.75%
5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Interest rate	5.50%		5.50%
6.25% senior notes
Debt Instrument [Line Items]
Interest rate	6.25%	6.25%
Estimated Fair Value | 10.75% senior secured notes due April 15, 2022
Debt Instrument [Line Items]
Long-term debt	$ 492.8		$ 0
Estimated Fair Value | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Long-term debt	237.9		379.8
Estimated Fair Value | 6.25% senior notes
Debt Instrument [Line Items]
Long-term debt	$ 0		$ 97.8

Debt - Schedule of Maturities o

Debt - Schedule of Maturities of Long-term Debt, Including Capital Leases (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Long-Term Debt
2,018	$ 8.2
2,019	0
2,020	0.9
2,021	188.1
2,022	431.5
Thereafter	8.4
Long-term debt	637.1
Capital Leases
2,018	2.6
2,019	1.4
2,020	1.4
2,021	1.4
2,022	0.8
Thereafter	0
Total	7.6
Total
2,018	10.8
2,019	1.4
2,020	2.3
2,021	189.5
2,022	432.3
Thereafter	8.4
Total	$ 644.7	$ 300

Debt - Schedule of Interest Exp

Debt - Schedule of Interest Expense (Details) - Senior Notes - Convertible Senior Notes 2021 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Contractual interest coupon	$ 11.8	$ 9.2
Amortization of debt discount	6	4.3
Amortization of debt issuance costs	1.2	1
Total	$ 19	$ 14.5

Debt - Additional Information (

Debt - Additional Information (Detail)	Oct. 05, 2017USD ($)	Apr. 17, 2017USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)$ / shares	Dec. 31, 2016USD ($)shares$ / shares	Dec. 31, 2015USD ($)	May 08, 2017
Debt Instrument [Line Items]
Cash paid for interest				$ 39,900,000	$ 22,100,000	$ 14,400,000
Capitalized interest expense				4,200,000	3,000,000	3,100,000
Charge recognized as a result of redemption				1,500,000	4,000,000	0
Payments for capped call transactions				0	27,300,000	$ 0
Convertible Senior Notes 2021
Debt Instrument [Line Items]
Aggregate principal amount					1,000
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 125,000,000
Accordion feature increase limit	$ 150,000,000
Borrowings outstanding				0
Availability under the facility, net of letters of credit issued				110,500,000
Springing maturity, period prior to maturity date of convertible senior notes due 2021	91 days
Springing maturity, period prior to maturity date of secured notes due 2022	60 days
Credit Agreement | Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				30,000,000
Letters of credit outstanding				$ 4,700,000
Senior Notes | Senior Secured Notes Due 2022
Debt Instrument [Line Items]
Aggregate principal amount		$ 440,000,000
Interest rate		10.75%
Redemption price, percent of principal amount of notes redeemed				100.00%
Percent of notes with option to redeem				35.00%
Redemption price, percentage of principal amount		110.75%
Redemption price if required collateral coverage ratio not met, percentage of principal amount		100.00%
Minimum collateral coverage ratio		1.50
Collateral coverage ratio, amount added to cash and cash equivalents		4.75
Collateral coverage ratio, multiplier for Average Grantor EBITDA for seven most recent fiscal quarters		4
Period to redeem notes without default if required collateral coverage ratio not met		90 days
Redemption price if company experiences change of control, percent of principal amount		101.00%
Senior Notes | 6.25% senior notes
Debt Instrument [Line Items]
Interest rate				6.25%			6.25%
Charge recognized as a result of redemption			$ 1,500,000
Premium and expenses paid for redemption of debt			1,300,000
Write off of unamortized discount and fees related to the portion of the notes redeemed			$ 200,000
Senior Notes | Convertible Senior Notes 2021
Debt Instrument [Line Items]
Aggregate principal amount				$ 213,500,000	$ 213,500,000
Interest rate				5.50%	5.50%
Effective interest rate					9.50%
Conversion rate (in shares) | shares					102.4249
Total amount of conversion (in shares) | shares					21,867,716
Conversion price (in usd per share) | $ / shares				$ 12.75	$ 9.76
Payments for capped call transactions					$ 27,300,000
Conversion premium				60.00%	22.50%
Line of Credit | Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Requirement to maintain fixed charge coverage ratio, availability threshold, percent of lender commitments under facility	10.00%
Requirement to maintain fixed charge coverage ratio, availability threshold	$ 15,000,000
Amount of aggregate default under other debt that would trigger event of default	$ 50,000,000

Other accrued liabilities (Deta

Other accrued liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Payrolls and commissions	$ 120.2	$ 110.6
Cost reduction	87.7	21.2
Accrued vacations	42.8	47.1
Taxes other than income taxes	29.1	25.4
Income taxes	26	35.3
Postretirement	18.5	19.3
Accrued interest	13.8	6.1
Other	53.4	84.2
Total other accrued liabilities	$ 391.5	$ 349.2

Rental expense and commitment68

Rental expense and commitments - Schedule of Rental Expense and Income from Subleases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Rental expense, less income from subleases	$ 71.7	$ 77.4	$ 80.6
Income from subleases	$ 4.4	$ 7.8	$ 9.1

Rental expense and commitment69

Rental expense and commitments - Schedule of Minimum Net Rental Commitments Under Noncancelable Operating Leases (Details) $ in Millions	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 47.4
2,019	41.3
2,020	32.9
2,021	21.5
2,022	16.2
Thereafter	39.4
Total	$ 198.7

Rental expense and commitment70

Rental expense and commitments - Additional Information (Detail) $ in Millions	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
Future minimum sublease rentals	$ 7.2
Standby letters of credit and surety bonds outstanding	318
Deposits and collateralized assets	$ 14

Financial instruments and con71

Financial instruments and concentration of credit risks - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair Value Measurements Disclosure [Line Items]
Maturity period limit of foreign currency exchange instruments (in months)	3 months
Receivables due from U.S. federal governmental agencies	$ 75.8	$ 74
Foreign Exchange Forward Contract
Fair Value Measurements Disclosure [Line Items]
Notional amount of foreign exchange forward contracts not designated as hedging instruments	$ 514	$ 428.9

Financial instruments and con72

Financial instruments and concentration of credit risks - Fair Value of Foreign Exchange Forward Contracts by Balance Sheet Location (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fair value	$ 3.3	$ 0.5
Prepaid expenses and other current assets | Foreign Exchange Forward Contract | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	4.9	2.4
Other accrued liabilities | Foreign Exchange Forward Contract | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	$ 1.6	$ 1.9

Financial instruments and con73

Financial instruments and concentration of credit risks - Gains and Losses Recognized on Foreign Exchange Forward Contracts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other income (expense), net
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Amount of gain (loss) recognized	$ 27.5	$ (29.1)	$ 15.6

Foreign currency - Additional I

Foreign currency - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intercompany Foreign Currency Balance [Line Items]
Gain (loss) recognized on foreign exchange	$ (9.9)	$ 2.3	$ 8.1
Facility Closing
Intercompany Foreign Currency Balance [Line Items]
Gain (loss) recognized on foreign exchange	$ (11.8)

Litigation and contingencies -

Litigation and contingencies - Additional Information (Detail) € in Millions, $ in Millions	1 Months Ended	115 Months Ended
	Apr. 30, 2007EUR (€)	Jul. 31, 2011USD ($)	Dec. 31, 2017USD ($)	Apr. 30, 2008EUR (€)
Loss Contingencies [Line Items]
Amount related to unreserved tax-related matters, inclusive of interest | $			$ 135
Ministry Of Justice Of Belgium
Loss Contingencies [Line Items]
Loss contingency, damages sought value | €	€ 28
Counterclaim against termination of contract | €				€ 18.5
Pharmaceutical Claims
Loss Contingencies [Line Items]
Loss contingency, damages sought value | $		$ 68

Segment Information - Additiona

Segment Information - Additional Information (Detail) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2017USD ($)segmentcustomer	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment									2
Operating profit (loss)									$ 4.6	$ 47.6	$ (55.1)
Number of customers accounted for more than 10% of revenue | customer									0
Revenue	$ 744.8	$ 666.3	$ 666.2	$ 664.5	$ 721.7	$ 683.3	$ 748.9	$ 666.8	$ 2,741.8	2,820.7	3,015.1
Various Agencies Of U.S. Government
Segment Reporting Information [Line Items]
Revenue									571	564	569
Other Technology | Segment Reconciling Items
Segment Reporting Information [Line Items]
Operating profit (loss)									$ 6.3	$ 0.7	$ 9.2

Segment information - Customer

Segment information - Customer Revenue by Classes of Similar Products or Services (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
Revenue from External Customer [Line Items]
Revenue	$ 744.8	$ 666.3	$ 666.2	$ 664.5	$ 721.7	$ 683.3	$ 748.9	$ 666.8	$ 2,741.8	$ 2,820.7	$ 3,015.1
Services
Revenue from External Customer [Line Items]
Revenue									2,328.2	2,406.3	2,605.6
Technology
Revenue from External Customer [Line Items]
Revenue									413.6	414.4	409.5
Cloud & infrastructure services | Services
Revenue from External Customer [Line Items]
Revenue									1,317	1,352.9	1,513.1
Application services | Services
Revenue from External Customer [Line Items]
Revenue									808.3	859	868.9
BPO services | Services
Revenue from External Customer [Line Items]
Revenue									$ 202.9	$ 194.4	$ 223.6

Segment information - Reconcili

Segment information - Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended			36 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	Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)									$ 4.6	$ 47.6	$ (55.1)
Interest expense									(52.8)	(27.4)	(11.9)
Other income (expense), net									(23.9)	0.3	8.2
Cost reduction charges	$ (47.8)	$ (46.1)	$ (27.5)	$ (25.4)	$ (13.1)	$ (31.9)	$ (10.2)	$ (26.9)	(146.8)	(82.1)	(118.5)	$ (347.4)
Income (loss) before income taxes	$ 27.4	$ (40.4)	$ (42.3)	$ (16.8)	$ 24.6	$ (15.2)	$ 44.3	$ (33.2)	(72.1)	20.5	(58.8)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)									235.4	208.4	174.9
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost reduction charges									(135)	(82.1)	(118.5)
Corporate and eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)									(95.8)	$ (78.7)	$ (111.5)
Other income (expense), net
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost reduction charges									(11.8)
Other income (expense), net | Net foreign currency translation adjustment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost reduction charges									$ (11.8)

Segment information - Reconci79

Segment information - Reconciliation of Total Business Segment Assets to Consolidated Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,542.4	$ 2,021.6	$ 2,130
Cash and cash equivalents	733.9	370.6	365.2
Deferred income taxes	119.9	146.1	127.4
Prepaid postretirement assets	148.3	33.3	45.1
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,364.5	1,339	1,486
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,177.9	682.6	644
Other corporate assets	$ 175.8	$ 132.6	$ 106.3

Segment information - Summary o

Segment information - Summary of Operations by Segment (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]
Revenue	$ 744.8	$ 666.3	$ 666.2	$ 664.5	$ 721.7	$ 683.3	$ 748.9	$ 666.8	$ 2,741.8	$ 2,820.7	$ 3,015.1
Operating income (loss)									4.6	47.6	(55.1)
Depreciation and amortization									156.5	155.6	180.1
Total assets	2,542.4				2,021.6				2,542.4	2,021.6	2,130
Capital expenditures									176.5	147.1	213.7
Intersegment
Segment Reporting Information [Line Items]
Revenue									(25.9)	(22.6)	(49)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									235.4	208.4	174.9
Total assets	1,364.5				1,339				1,364.5	1,339	1,486
Corporate
Segment Reporting Information [Line Items]
Revenue									(25.9)	(22.6)	(49)
Operating income (loss)									(230.8)	(160.8)	(230)
Total assets	1,177.9				682.6				1,177.9	682.6	644
Capital expenditures									4.3	3	1.9
Services
Segment Reporting Information [Line Items]
Revenue									2,328.2	2,406.3	2,605.6
Operating income (loss)									64.8	46.9	61.2
Depreciation and amortization									84.6	81.8	104.8
Total assets	985.9				963.3				985.9	963.3	1,081.7
Capital expenditures									102.7	74.8	143.3
Services | Intersegment
Segment Reporting Information [Line Items]
Revenue									0	0	0.1
Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue									2,328.2	2,406.3	2,605.7
Technology
Segment Reporting Information [Line Items]
Revenue									413.6	414.4	409.5
Operating income (loss)									170.6	161.5	113.7
Depreciation and amortization									71.9	73.8	75.3
Total assets	$ 378.6				$ 375.7				378.6	375.7	404.3
Capital expenditures									69.5	69.3	68.5
Technology | Intersegment
Segment Reporting Information [Line Items]
Revenue									25.9	22.6	48.9
Technology | Operating Segments
Segment Reporting Information [Line Items]
Revenue									$ 439.5	$ 437	$ 458.4

Segment information - Revenue,

Segment information - Revenue, Properties and Outsourcing Assets by Geographic Segment (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
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 744.8	$ 666.3	$ 666.2	$ 664.5	$ 721.7	$ 683.3	$ 748.9	$ 666.8	$ 2,741.8	$ 2,820.7	$ 3,015.1
Properties, net	142.5				145.3				142.5	145.3	153.8
Outsourcing assets, net	202.3				172.5				202.3	172.5	182
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,257	1,309.3	1,454.9
Properties, net	85.8				91.4				85.8	91.4	96.9
Outsourcing assets, net	81.1				105.1				81.1	105.1	119.4
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									315.8	348	375.8
Properties, net	16.7				15.1				16.7	15.1	18.8
Outsourcing assets, net	89.9				39				89.9	39	36.6
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,169	1,163.4	1,184.4
Properties, net	40				38.8				40	38.8	38.1
Outsourcing assets, net	$ 31.3				$ 28.4				$ 31.3	$ 28.4	$ 26

Employee plans - Additional Inf

Employee plans - Additional Information (Detail)	1 Months Ended	12 Months Ended
	Dec. 31, 2016USD ($)Employee	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of unissued common stock available for grant under the plans (in shares) | shares		3,200,000
Age requirement for vesting provision, minimum		55 years
Completion of service period (in years) for stock awards		5 years
Option vesting period (in years)		3 years
Share-based compensation expense		$ 11,200,000	$ 9,500,000	$ 9,400,000
Grants of stock option awards (in shares) | shares		0
Proceeds from exercise of stock options		$ 0	0	3,700,000
Matching contribution by the company as percentage of participants' contribution		50.00%
Percentage of eligible pay contributed by participants that will be matched		6.00%
Cost recognized for contribution plans		$ 10,800,000	10,700,000	9,900,000
Deferred compensation liability	$ 12,300,000	13,400,000	12,300,000
Number of former associates | Employee	5,800
Lump sum payments made to former associates	$ 215,900,000
International Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost recognized for contribution plans		18,500,000	19,000,000	21,400,000
Pension Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected pretax amortization of net loss in 2017		167,600,000
Expected pretax amortization of prior service cost (credit) in 2017		6,300,000
Amortization of net loss		176,200,000
Amortization of prior service credit		(4,900,000)
Estimated cash contributions by the company in 2017		149,700,000
Pension Plans | U.S. Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Curtailment gain		0	0	0
Amortization of net loss		126,400,000	116,000,000	132,700,000
Amortization of prior service credit		(2,500,000)	(2,500,000)	(2,400,000)
Estimated cash contributions by the company in 2017		86,300,000
Pension Plans | International Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Curtailment gain		5,400,000	2,000,000	0
Amortization of net loss		49,800,000	40,300,000	63,600,000
Amortization of prior service credit		(2,400,000)	(3,000,000)	(1,900,000)
Estimated cash contributions by the company in 2017		63,400,000
Other Postretirement Benefit Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected pretax amortization of net loss in 2017		1,200,000
Expected pretax amortization of prior service cost (credit) in 2017		(1,600,000)
Amortization of net loss		800,000	500,000	1,800,000
Amortization of prior service credit		(700,000)	0	1,100,000
Estimated cash contributions by the company in 2017		12,000,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		10,100,000	7,500,000	4,700,000
Total unrecognized compensation cost		$ 9,800,000
Unrecognized compensation cost, Weighted-average recognition period		1 year 10 months 25 days
Aggregate weighted-average grant-date fair value of units granted		$ 14,400,000	12,900,000	10,200,000
Aggregate weighted-average grant-date fair value of units vested		7,400,000	3,500,000	2,100,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense		1,100,000	$ 2,000,000	4,700,000
Total intrinsic value of options exercised		0		$ 600,000
Total unrecognized compensation cost		$ 100,000
Unrecognized compensation cost, Weighted-average recognition period		6 months
Performance-Based Unit | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares which will vest after achievement of goals (in shares) | shares		0
Performance-Based Unit | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares which will vest after achievement of goals (in shares) | shares		2
Options Issued in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum contractual term of options granted (in years)		7 years
Options Issued Before 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum contractual term of options granted (in years)		5 years

Employee plans - Fair Value Ass

Employee plans - Fair Value Assumptions on Stock Option (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Weighted-average fair value of grant (in dollars per share)	$ 4.53	$ 8.92
Risk-free interest rate	1.29%	1.28%
Expected volatility	51.30%	45.46%
Expected life of options in years	4 years 10 months 25 days	4 years 11 months 1 day
Expected dividend yield	0.00%	0.00%

Employee plans - Summary of Sto

Employee plans - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)$ / sharesshares
Shares
Outstanding at beginning of period (in shares) | shares	2,099,000
Granted (in shares) | shares	0
Exercised (in shares) | shares	(1,000)
Forfeited and expired (in shares) | shares	(340,000)
Outstanding at end of period (in shares) | shares	1,758,000
Expected to vest at end of period (in shares) | shares	198,000
Exercisable at end of period (in shares) | shares	1,558,000
Weighted- Average Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 25.41
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	10.65
Forfeited and expired (in dollars per share) | $ / shares	20.59
Outstanding at end of period (in dollars per share) | $ / shares	26.35
Expected to vest at end of period (in dollars per share) | $ / shares	23.20
Exercisable at end of period (in dollars per share) | $ / shares	$ 26.76
Weighted- Average Remaining Contractual Term (years)
Outstanding at end of period	1 year 6 months 21 days
Expected to vest at end of period	3 years 5 months 1 day
Exercisable at end of period	1 year 3 months 29 days
Aggregate Intrinsic Value
Outstanding at end of period | $	$ 0
Expected to vest at end of period | $	0
Exercisable at end of period | $	$ 0

Employee plans - Summary of Res

Employee plans - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units shares in Thousands	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Restricted Stock Units
Outstanding at beginning of period (in shares) | shares	1,454
Granted (in shares) | shares	1,042
Vested (in shares) | shares	(555)
Forfeited and expired (in shares) | shares	(253)
Outstanding at end of period (in shares) | shares	1,688
Weighted-Average Grant-Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 12.68
Granted (in dollars per share) | $ / shares	13.85
Vested (in dollars per share) | $ / shares	13.31
Forfeited and expired (in dollars per share) | $ / shares	11.88
Outstanding at end of period (in dollars per share) | $ / shares	$ 13.39

Employee plans - Funded Status

Employee plans - Funded Status of the Plan and Amounts Recognized in Consolidated Balance Sheet (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets	$ 148.3	$ 33.3	$ 45.1
Other accrued liabilities	(18.5)	(19.3)
Long-term postretirement liabilities	(2,004.4)	(2,292.6)
Pension Plans | U.S. Plans
Change in projected benefit obligation
Benefit obligation at beginning of year	4,972	5,231.4
Service cost	0	0	0
Interest cost	211.3	231.3	224.1
Plan participants’ contributions	0	0
Plan amendment	0	0
Plan curtailment	0	0
Actuarial loss (gain)	177	87.2
Benefits paid	(358.7)	(577.9)
Foreign currency translation adjustments	0	0
Benefit obligation at end of year	5,001.6	4,972	5,231.4
Change in plan assets
Fair value of plan assets at beginning of year	3,452.1	3,759.4
Actual return on plan assets	424	211.8
Employer contribution	61	58.8
Plan participants’ contributions	0	0
Benefits paid	(358.7)	(577.9)
Foreign currency translation and other adjustments	0	0
Fair value of plan assets at end of year	3,578.4	3,452.1	3,759.4
Funded status at end of year	(1,423.2)	(1,519.9)
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets	0	0
Other accrued liabilities	(6.8)	(6.7)
Long-term postretirement liabilities	(1,416.4)	(1,513.2)
Total funded status	(1,423.2)	(1,519.9)
Accumulated other comprehensive loss, net of tax
Net loss	2,690.6	2,828.8
Prior service credit	(39.8)	(42.4)
Accumulated benefit obligation	5,001.6	4,972
Pension Plans | International Plans
Change in projected benefit obligation
Benefit obligation at beginning of year	3,076.2	2,987.8
Service cost	5.1	7.4	8.7
Interest cost	72.8	87.8	94.1
Plan participants’ contributions	1.9	2.3
Plan amendment	(52.5)	0
Plan curtailment	(2.2)	(3.7)
Actuarial loss (gain)	(93.8)	502.2
Benefits paid	(117.1)	(110)
Foreign currency translation adjustments	299.3	(397.6)
Benefit obligation at end of year	3,189.7	3,076.2	2,987.8
Change in plan assets
Fair value of plan assets at beginning of year	2,429.7	2,496.8
Actual return on plan assets	172.3	287.7
Employer contribution	77.4	73.7
Plan participants’ contributions	1.9	2.3
Benefits paid	(117.1)	(110)
Foreign currency translation and other adjustments	269.7	(320.8)
Fair value of plan assets at end of year	2,833.9	2,429.7	2,496.8
Funded status at end of year	(355.8)	(646.5)
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets	147.4	31.9
Other accrued liabilities	(0.2)	(0.2)
Long-term postretirement liabilities	(503)	(678.2)
Total funded status	(355.8)	(646.5)
Accumulated other comprehensive loss, net of tax
Net loss	1,067.8	1,144.7
Prior service credit	(69.8)	(27.7)
Accumulated benefit obligation	3,188	3,072.1
Other Postretirement Benefit Plans
Change in projected benefit obligation
Benefit obligation at beginning of year	120.1	131.5
Service cost	0.5	0.4	0.6
Interest cost	5.6	6.2	6.9
Plan participants’ contributions	3.5	3.8
Plan amendment	(7.4)	(3.3)
Actuarial loss (gain)	(4.3)	(1.4)
Federal drug subsidy	0.3	1.4
Benefits paid	(15.7)	(16.9)
Foreign currency translation adjustments	0.6	(1.6)
Benefit obligation at end of year	103.2	120.1	131.5
Change in plan assets
Fair value of plan assets at beginning of year	7.9	7.7
Actual return on plan assets	(0.3)	(0.3)
Employer contribution	12.2	13.6
Plan participants’ contributions	3.5	3.8
Benefits paid	(15.7)	(16.9)
Fair value of plan assets at end of year	7.6	7.9	$ 7.7
Funded status at end of year	(95.6)	(112.2)
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets	0.9	1.4
Other accrued liabilities	(11.5)	(12.4)
Long-term postretirement liabilities	(85)	(101.2)
Total funded status	(95.6)	(112.2)
Accumulated other comprehensive loss, net of tax
Net loss	14.9	19
Prior service credit	$ (9.8)	$ (3.2)

Employee plans - Schedule of Ac

Employee plans - Schedule of Accumulated and Projected Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Accumulated benefit obligation	$ 7,151.7	$ 7,551.8
Fair value of plan assets	5,227	5,357.2
Projected benefit obligation	7,153.4	7,555.2
Fair value of plan assets	$ 5,227	$ 5,357.2

Employee plans - Components of

Employee plans - Components of Net Periodic Benefit Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service credit	$ (4.9)
Recognized net actuarial loss	176.2
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	$ 0	$ 0
Interest cost	211.3	231.3	224.1
Expected return on plan assets	(235.2)	(253.1)	(254.8)
Amortization of prior service credit	(2.5)	(2.5)	(2.4)
Recognized net actuarial loss	126.4	116	132.7
Curtailment gain	0	0	0
Net periodic pension cost (income)	100	91.7	99.6
Pension Plans | International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	5.1	7.4	8.7
Interest cost	72.8	87.8	94.1
Expected return on plan assets	(127.5)	(139.5)	(155.4)
Amortization of prior service credit	(2.4)	(3)	(1.9)
Recognized net actuarial loss	49.8	40.3	63.6
Curtailment gain	(5.4)	(2)	0
Net periodic pension cost (income)	(7.6)	(9)	9.1
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.5	0.4	0.6
Interest cost	5.6	6.2	6.9
Expected return on plan assets	(0.5)	(0.4)	(0.4)
Amortization of prior service credit	(0.7)	0	1.1
Recognized net actuarial loss	0.8	0.5	1.8
Net periodic pension cost (income)	$ 5.7	$ 6.7	$ 10

Employee plans - Schedule of We

Employee plans - Schedule of Weighted-Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.38%	4.56%	4.09%
Expected long-term rate of return on assets	6.80%	6.80%	6.80%
Weighted-average assumptions used to determine benefit obligations at December 31 were as follows:
Discount rate	3.87%	4.38%	4.56%
Pension Plans | International Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.34%	3.30%	3.05%
Rate of compensation increase	1.66%	1.66%	1.68%
Expected long-term rate of return on assets	5.30%	5.99%	6.45%
Weighted-average assumptions used to determine benefit obligations at December 31 were as follows:
Discount rate	2.24%	2.34%	3.30%
Rate of compensation increase	1.55%	1.66%	1.68%
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.53%	5.61%	5.27%
Expected long-term rate of return on assets	5.50%	5.50%	5.50%
Weighted-average assumptions used to determine benefit obligations at December 31 were as follows:
Discount rate	5.30%	5.53%	5.61%

Employee plans - Company's Inve

Employee plans - Company's Investment Policy Targets and Ranges for Each Asset Category (Details) - Pension Plans	Dec. 31, 2017
U.S. Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	58.00%
U.S. Plans | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	36.00%
U.S. Plans | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	6.00%
U.S. Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	0.00%
U.S. Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	0.00%
U.S. Plans | Minimum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	52.00%
U.S. Plans | Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	33.00%
U.S. Plans | Minimum | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	3.00%
U.S. Plans | Minimum | Cash
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	0.00%
U.S. Plans | Minimum | Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	0.00%
U.S. Plans | Maximum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	64.00%
U.S. Plans | Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	39.00%
U.S. Plans | Maximum | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	9.00%
U.S. Plans | Maximum | Cash
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	5.00%
International Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	24.00%
International Plans | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	60.00%
International Plans | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	1.00%
International Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	1.00%
International Plans | Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	14.00%
International Plans | Minimum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	18.00%
International Plans | Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	53.00%
International Plans | Minimum | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	0.00%
International Plans | Minimum | Cash
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	0.00%
International Plans | Minimum | Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	7.00%
International Plans | Maximum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	30.00%
International Plans | Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	66.00%
International Plans | Maximum | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	3.00%
International Plans | Maximum | Cash
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	5.00%
International Plans | Maximum | Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	21.00%

Employee plans - Expected Futur

Employee plans - Expected Future Benefit Payments (Details) $ in Millions	Dec. 31, 2017USD ($)
Pension Plans | U.S. Plans
Gross Expected Payments
Expected future benefit payments, 2018	$ 364.4
Expected future benefit payments, 2019	361.4
Expected future benefit payments, 2020	359.3
Expected future benefit payments, 2021	357.6
Expected future benefit payments, 2022	355.1
Expected future benefit payments, 2023 - 2027	1,693.6
Pension Plans | International Plans
Gross Expected Payments
Expected future benefit payments, 2018	98.7
Expected future benefit payments, 2019	102.8
Expected future benefit payments, 2020	106.9
Expected future benefit payments, 2021	110.3
Expected future benefit payments, 2022	117.5
Expected future benefit payments, 2023 - 2027	642.5
Other Postretirement Benefit Plans
Gross Expected Payments
Expected future benefit payments, 2018	12.7
Expected future benefit payments, 2019	10.5
Expected future benefit payments, 2020	10
Expected future benefit payments, 2021	9.4
Expected future benefit payments, 2022	8.8
Expected future benefit payments, 2023 - 2027	34.4
Gross Medicare Part D Receipts
Gross Medicare Part D Receipts, 2018	0.1
Gross Medicare Part D Receipts, 2019	0
Gross Medicare Part D Receipts, 2020	0
Gross Medicare Part D Receipts, 2021	0
Gross Medicare Part D Receipts, 2022	0
Gross Medicare Part D Receipts, 2023 - 2027	$ 0

Employee plans - Assumed Health

Employee plans - Assumed Health Care Cost Trend Rates (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Health care cost trend rate assumed for next year	6.60%	5.80%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.80%	4.80%
Year that the rate reaches the ultimate trend rate	2,023	2,023

Employee plans - Effect of One-

Employee plans - Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
1-Percentage- Point Increase
Effect on service and interest cost	$ 0.1
Effect on postretirement benefit obligation	2
1-Percentage- Point Decrease
Effect on service and interest cost	(0.1)
Effect on postretirement benefit obligation	$ (1.7)

Employee plans - Schedule of Pl

Employee plans - Schedule of Plan Assets at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	$ 3,578.4	$ 3,452.1	$ 3,759.4
Total plan assets in fair value hierarchy	3,340.2	3,287.3
Plan assets measured using NAV as a practical expedient	238.2	164.8
Pension Plans | U.S. Plans | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1,465.1	1,443.1
Pension Plans | U.S. Plans | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	584.4	517.9
Plan assets measured using NAV as a practical expedient	0	0
Pension Plans | U.S. Plans | U.S. Govt. Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	139.8	158.5
Pension Plans | U.S. Plans | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	830.6	812.4
Pension Plans | U.S. Plans | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	19.8	18.6
Pension Plans | U.S. Plans | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	113.5	156.2
Pension Plans | U.S. Plans | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	2.6	3.1
Pension Plans | U.S. Plans | Other, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	105.1	104.6
Pension Plans | U.S. Plans | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	228	272
Pension Plans | U.S. Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	34.8	12.2
Pension Plans | U.S. Plans | Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	58.1	107.2
Pension Plans | U.S. Plans | Payables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	(116.7)	(195.3)
Pension Plans | U.S. Plans | Private Real Estate
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	112.4	40.5
Pension Plans | U.S. Plans | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	0.9	1.1
Pension Plans | U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1,704.5	1,676
Pension Plans | U.S. Plans | Level 1 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1,461.9	1,438.3
Pension Plans | U.S. Plans | Level 1 | U.S. Govt. Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	139.8	158.5
Pension Plans | U.S. Plans | Level 1 | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	113.5	156.2
Pension Plans | U.S. Plans | Level 1 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	13.1	(1.1)
Pension Plans | U.S. Plans | Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	34.8	12.2
Pension Plans | U.S. Plans | Level 1 | Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	58.1	107.2
Pension Plans | U.S. Plans | Level 1 | Payables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	(116.7)	(195.3)
Pension Plans | U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1,635.7	1,611.3
Pension Plans | U.S. Plans | Level 2 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	3.2	4.8
Pension Plans | U.S. Plans | Level 2 | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	584.4	517.9
Pension Plans | U.S. Plans | Level 2 | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	830.6	812.4
Pension Plans | U.S. Plans | Level 2 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	(10.5)	4.2
Pension Plans | U.S. Plans | Level 2 | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	228	272
Pension Plans | U.S. Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0	0
Pension Plans | U.S. Plans | Level 3 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0	0
Pension Plans | International Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	2,833.9	2,429.7	2,496.8
Total plan assets in fair value hierarchy	1,173.8	995.5
Plan assets measured using NAV as a practical expedient	1,660.1	1,434.2
Pension Plans | International Plans | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0	0
Pension Plans | International Plans | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	84	76
Plan assets measured using NAV as a practical expedient	780.7	726.7
Pension Plans | International Plans | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	254.1	241.4
Pension Plans | International Plans | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	135.8	116.2
Pension Plans | International Plans | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	267.5	242.8
Plan assets measured using NAV as a practical expedient	837.7	640
Pension Plans | International Plans | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1.4	1.6
Pension Plans | International Plans | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1.2	4.9
Pension Plans | International Plans | Other, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	357.1	294.5
Plan assets measured using NAV as a practical expedient	25.2	25.8
Pension Plans | International Plans | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	29.2	6.7
Pension Plans | International Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	25.1	11.4
Pension Plans | International Plans | Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	19.9
Pension Plans | International Plans | Payables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	(1.5)
Pension Plans | International Plans | Private Real Estate
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	16.5	41.7
Pension Plans | International Plans | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Plan assets measured using NAV as a practical expedient	0	0
Pension Plans | International Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	46.5	13.1
Pension Plans | International Plans | Level 1 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0	0
Pension Plans | International Plans | Level 1 | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	2.6	0.5
Pension Plans | International Plans | Level 1 | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0.4	1.2
Pension Plans | International Plans | Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	25.1	11.4
Pension Plans | International Plans | Level 1 | Receivables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	19.9
Pension Plans | International Plans | Level 1 | Payables
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	(1.5)
Pension Plans | International Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	991.5	866.2
Pension Plans | International Plans | Level 2 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0	0
Pension Plans | International Plans | Level 2 | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	84	76
Pension Plans | International Plans | Level 2 | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	251.5	240.9
Pension Plans | International Plans | Level 2 | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	267.5	242.8
Pension Plans | International Plans | Level 2 | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1	0.4
Pension Plans | International Plans | Level 2 | Derivatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	1.2	4.9
Pension Plans | International Plans | Level 2 | Other, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	357.1	294.5
Pension Plans | International Plans | Level 2 | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	29.2	6.7
Pension Plans | International Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	135.8	116.2
Pension Plans | International Plans | Level 3 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	0	0
Pension Plans | International Plans | Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	135.8	116.2	120.6
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	7.6	7.9	7.7
Other Postretirement Benefit Plans | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total		7.9
Other Postretirement Benefit Plans | Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total		7.9
Other Postretirement Benefit Plans | U.S. Plans | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	7.6
Other Postretirement Benefit Plans | U.S. Plans | Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets total	$ 7.6	$ 7.9	$ 7.7

Employee plans - Summary of Cha

Employee plans - Summary of Changes in Level 3 Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other Postretirement Benefit Plans
Change in plan assets
Fair value of plan assets at beginning of year	$ 7.9	$ 7.7
Fair value of plan assets at end of year	7.6	7.9
Other Postretirement Benefit Plans | Insurance Contracts
Change in plan assets
Fair value of plan assets at beginning of year	7.9
Fair value of plan assets at end of year		7.9
Other Postretirement Benefit Plans | Level 3 | Insurance Contracts
Change in plan assets
Fair value of plan assets at beginning of year	7.9
Fair value of plan assets at end of year		7.9
U.S. Plans | Pension Plans
Change in plan assets
Fair value of plan assets at beginning of year	3,452.1	3,759.4
Fair value of plan assets at end of year	3,578.4	3,452.1
U.S. Plans | Pension Plans | Level 3
Change in plan assets
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
U.S. Plans | Other Postretirement Benefit Plans | Insurance Contracts
Change in plan assets
Fair value of plan assets at end of year	7.6
U.S. Plans | Other Postretirement Benefit Plans | Level 3 | Insurance Contracts
Change in plan assets
Fair value of plan assets at beginning of year	7.9	7.7
Realized gains (losses)	(0.2)	(0.3)
Purchases or acquisitions	0.2	0.5
Sales or dispositions	(0.3)	0
Currency and unrealized gains (losses) relating to instruments still held at December 31, 2017	0	0
Fair value of plan assets at end of year	7.6	7.9
International Plans | Pension Plans
Change in plan assets
Fair value of plan assets at beginning of year	2,429.7	2,496.8
Fair value of plan assets at end of year	2,833.9	2,429.7
International Plans | Pension Plans | Insurance Contracts
Change in plan assets
Fair value of plan assets at beginning of year	116.2
Fair value of plan assets at end of year	135.8	116.2
International Plans | Pension Plans | Level 3
Change in plan assets
Fair value of plan assets at beginning of year	116.2
Fair value of plan assets at end of year	135.8	116.2
International Plans | Pension Plans | Level 3 | Insurance Contracts
Change in plan assets
Fair value of plan assets at beginning of year	116.2	120.6
Realized gains (losses)	0	0
Purchases or acquisitions	10.8	4.7
Sales or dispositions	(11.4)	(11)
Currency and unrealized gains (losses) relating to instruments still held at December 31, 2017	20.2	1.9
Fair value of plan assets at end of year	$ 135.8	$ 116.2

Employee plans - Additional I96

Employee plans - Additional Information About Plan Assets Valued Using Net Asset Value (Details) - Pension Plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
U.S. Plans
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 238.2	$ 164.8
Unfunded Commit-ments	0	0
U.S. Plans | Equity Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 0	0
Redemption Notice Period Range	90 days
U.S. Plans | Debt Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 19.8	18.6
Unfunded Commit-ments	$ 0	$ 0
Redemption Notice Period Range	5 days	5 days
U.S. Plans | Other, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 105.1	$ 104.6
Unfunded Commit-ments	$ 0	$ 0
Redemption Notice Period Range	5 days	5 days
U.S. Plans | Private Real Estate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 112.4	$ 40.5
Unfunded Commit-ments	$ 0	$ 0
Redemption Notice Period Range		60 days
Limited partnerships, period expected to make all distributions	3 years
U.S. Plans | Private Equity
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 0.9	$ 1.1
Unfunded Commit-ments	$ 0	0
Limited partnerships, period expected to make all distributions	3 years
International Plans
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 1,660.1	1,434.2
Unfunded Commit-ments	0	0
International Plans | Equity Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	780.7	726.7
Unfunded Commit-ments	$ 0	$ 0
Redemption Notice Period Range	30 days	90 days
International Plans | Debt Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 837.7	$ 640
Unfunded Commit-ments	$ 0	$ 0
Redemption Notice Period Range	30 days	90 days
International Plans | Other, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 25.2	$ 25.8
Unfunded Commit-ments	$ 0	$ 0
Redemption Notice Period Range	30 days	90 days
International Plans | Private Real Estate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 16.5	$ 41.7
Unfunded Commit-ments	$ 0	$ 0
Redemption Notice Period Range	90 days	90 days
International Plans | Private Equity
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 0	$ 0

Stockholders' equity - Addition

Stockholders' equity - Additional Information (Details) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Common stock, shares authorized (in shares)	150,000,000	100,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	40,000,000
Preferred stock, par value (in dollars per share)	$ 1
Unissued common stock reserved for stock-based incentive plans and convertible debt (in shares)	35,100,000

Stockholders' equity - Accumula

Stockholders' equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ (1,647.4)	$ (1,378.6)	$ (1,452.4)
Other comprehensive income before reclassifications	506.8	(64.9)	346.2
Amounts reclassified from accumulated other comprehensive income	(169.8)	(142.6)	(178.1)
Current period other comprehensive income	337	(207.5)	168.1
Ending Balance	(1,326.5)	(1,647.4)	(1,378.6)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(4,152.8)	(3,945.3)	(4,113.4)
Ending Balance	(3,815.8)	(4,152.8)	(3,945.3)
Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(927.1)	(833.8)	(737.8)
Other comprehensive income before reclassifications	121.9	(93.3)	(96)
Amounts reclassified from accumulated other comprehensive income	(11.8)	0	0
Current period other comprehensive income	110.1	(93.3)	(96)
Ending Balance	(817)	(927.1)	(833.8)
Postretirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(3,225.7)	(3,111.5)	(3,375.6)
Other comprehensive income before reclassifications	384.9	28.4	442.2
Amounts reclassified from accumulated other comprehensive income	(158)	(142.6)	(178.1)
Current period other comprehensive income	226.9	(114.2)	264.1
Ending Balance	$ (2,998.8)	$ (3,225.7)	$ (3,111.5)

Stockholders' equity - Amounts

Stockholders' equity - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income (expense), net	$ (23.9)	$ 0.3	$ 8.2
Total reclassifications for the period	(169.8)	(142.6)	(178.1)
Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassifications for the period	(11.8)	0	0
Amortization of prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of postretirement plan items, before tax	5.6	5.6	3.1
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of postretirement plan items, before tax	(174.1)	(155.2)	(189.7)
Curtailment gain
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of postretirement plan items, before tax	5.4	2	0
Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of postretirement plan items, before tax	(174.9)	(147.6)	(186.6)
Income tax benefit	5.1	5	8.5
Total reclassifications for the period	(158)	(142.6)	(178.1)
Adjustment for substantial completion of liquidation of foreign subsidiaries | Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income (expense), net	$ (11.8)	$ 0	$ 0

Stockholders' equity - Changes

Stockholders' equity - Changes in Common Stock and Treasury Stock (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	52.8	52.6	52.4
Stock-based compensation (in shares)	0.6	0.2	0.2
Ending Balance (in shares)	53.4	52.8	52.6
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	2.7	2.7	2.7
Stock-based compensation (in shares)	0.2	0	0
Ending Balance (in shares)	2.9	2.7	2.7

Quarterly financial informat101

Quarterly financial information (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
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 744.8	$ 666.3	$ 666.2	$ 664.5	$ 721.7	$ 683.3	$ 748.9	$ 666.8	$ 2,741.8	$ 2,820.7	$ 3,015.1
Gross profit	169.5	86.1	102.5	120.2	160.2	121.6	178.3	98.5	478.3	558.6
Income (loss) before income taxes	27.4	(40.4)	(42.3)	(16.8)	24.6	(15.2)	44.3	(33.2)	(72.1)	20.5	$ (58.8)
Net income (loss) attributable to Unisys Corporation common shareholders	$ 50.5	$ (41.1)	$ (42)	$ (32.7)	$ (1.2)	$ (28.2)	$ 21.6	$ (39.9)	$ (65.3)	$ (47.7)
Loss per common share attributable to Unisys Corporation
Basic (in dollars per share)	$ 1	$ (0.81)	$ (0.83)	$ (0.65)	$ (0.02)	$ (0.56)	$ 0.43	$ (0.80)	$ (1.30)	$ (0.95)	$ (2.20)
Diluted (in dollars per share)	$ 0.76	$ (0.81)	$ (0.83)	$ (0.65)	$ (0.02)	$ (0.56)	$ 0.36	$ (0.80)	$ (1.30)	$ (0.95)	$ (2.20)

Quarterly financial informat102

Quarterly financial information (unaudited) - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended			36 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	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Restructuring charges	$ 47.8	$ 46.1	$ 27.5	$ 25.4	$ 13.1	$ 31.9	$ 10.2	$ 26.9	$ 146.8	$ 82.1	$ 118.5	$ 347.4

Schedule II - Valuation and 103

Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for doubtful accounts (deducted from accounts receivable):
Balance at Beginning of Period	$ 22.8	$ 21.1	$ 30.1
Additions Charged to Costs and Expenses	3.1	2.2	3
Deductions	(3.9)	(0.5)	(12)
Balance at End of Period	$ 22	$ 22.8	$ 21.1