Unisys (UIS) 10-K 26 Feb 21 2020 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Jan. 31, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-8729
Entity Registrant Name	UNISYS CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-0387840
Entity Address, Address Line One	801 Lakeview Drive
Entity Address, Address Line Two	Suite 100
Entity Address, City or Town	Blue Bell
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19422
City Area Code	215
Local Phone Number	986-4011
Title of 12(b) Security	Common Stock, par value $.01
Trading Symbol	UIS
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 670.8
Entity Common Stock, Shares Outstanding		63,042,870
Documents Incorporated by Reference	Portions of Unisys Corporation’s Definitive Proxy Statement for the 2021 Annual Meeting of Stockholders are incorporated by reference into Part III hereof.
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000746838

Consolidated Statements of Inco

Consolidated Statements of Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue
Revenue	$ 2,026.3	$ 2,222.8	$ 2,251.2
Cost of revenue:
Cost of revenue	1,543.3	1,688.8	1,666.9
Selling, general and administrative	369.4	364.8	340.3
Research and development	26.6	31.3	31.9
Costs and expenses	1,939.3	2,084.9	2,039.1
Operating income	87	137.9	212.1
Interest expense	29.2	62.1	64
Other (expense), net	(329.6)	(136.4)	(77.1)
Income (loss) from continuing operations before income taxes	(271.8)	(60.6)	71
Provision for income taxes	45.4	27.7	46
Consolidated net income (loss) from continuing operations	(317.2)	(88.3)	25
Net income attributable to noncontrolling interests	0.5	3.9	3.4
Net income (loss) from continuing operations attributable to Unisys Corporation	(317.7)	(92.2)	21.6
Income from discontinued operations, net of tax	1,068.4	75	53.9
Net income (loss) attributable to Unisys Corporation	$ 750.7	$ (17.2)	$ 75.5
Basic
Continuing operations (in dollars per share)	$ (5.05)	$ (1.65)	$ 0.42
Discontinued Operations (in dollars per share)	16.98	1.34	1.06
Total (in dollars per share)	11.93	(0.31)	1.48
Diluted
Continuing operations (in dollars per share)	(5.05)	(1.65)	0.42
Discontinued operations (in dollars per share)	16.98	1.34	1.05
Total (in dollars per share)	$ 11.93	$ (0.31)	$ 1.47
Services
Revenue
Revenue	$ 1,692.9	$ 1,892.7	$ 1,857.6
Cost of revenue:
Cost of revenue	1,429.4	1,590.6	1,567.8
Operating income	12.2	20.8	9.1
Technology
Revenue
Revenue	333.4	330.1	393.6
Cost of revenue:
Cost of revenue	113.9	98.2	99.1
Operating income	$ 142.6	$ 159.3	$ 224.3

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss) from continuing operations	$ (317.2)	$ (88.3)	$ 25
Income from discontinued operations, net of tax	1,068.4	75	53.9
Total	751.2	(13.3)	78.9
Other comprehensive income
Foreign currency translation	49.3	24.4	(81.8)
Postretirement adjustments, net of tax of $(9.2) in 2020, $(11.3) in 2019 and $7.1 in 2018	106.9	(38.9)	33.8
Total other comprehensive income (loss)	156.2	(14.5)	(48)
Comprehensive income (loss)	907.4	(27.8)	30.9
Comprehensive income (loss) attributable to noncontrolling interests	7.6	(6.8)	15.7
Comprehensive income (loss) attributable to Unisys Corporation	$ 899.8	$ (21)	$ 15.2

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Postretirement adjustments, tax	$ (9.2)	$ (11.3)	$ 7.1

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 898.5	$ 538.8
Accounts receivable, net	460.5	417.7
Contract assets	44.3	38.4
Inventories	13.4	16.4
Prepaid expenses and other current assets	89.3	100.7
Current assets of discontinued operations	0	109.3
Total current assets	1,506	1,221.3
Properties	727	784
Less – Accumulated depreciation and amortization	616.5	668
Properties, net	110.5	116
Outsourcing assets, net	173.9	202.1
Marketable software, net	193.6	186.8
Operating lease right-of-use assets	79.3	71.4
Prepaid postretirement assets	187.5	136.2
Deferred income taxes	136.2	114
Goodwill	108.6	110.4
Restricted cash	8.2	13
Other long-term assets	204.1	198.9
Long-term assets of discontinued operations	0	133.9
Total assets	2,707.9	2,504
Current liabilities:
Current maturities of long-term debt	102.8	13.5
Accounts payable	223.2	204.3
Deferred revenue	257.1	246.4
Other accrued liabilities	352	316.7
Current liabilities of discontinued operations	0	146.4
Total current liabilities	935.1	927.3
Long-term debt	527.1	565.9
Long-term postretirement liabilities	1,286.1	1,960.2
Long-term deferred revenue	137.9	147
Long-term operating lease liabilities	62.4	56
Other long-term liabilities	71.4	47.6
Long-term liabilities of discontinued operations	0	28.3
Commitments and contingencies (see note 18)
Deficit:
Common stock, par value $.01 per share (150.0 million shares authorized; 66.8 million shares and 65.9 million shares issued)	0.7	0.7
Accumulated deficit	(960.5)	(1,711.2)
Treasury stock, at cost	(114.4)	(109.6)
Paid-in capital	4,656.9	4,643.3
Accumulated other comprehensive loss	(3,939.5)	(4,088.6)
Total Unisys stockholders’ deficit	(356.8)	(1,265.4)
Noncontrolling interests	44.7	37.1
Total deficit	(312.1)	(1,228.3)
Total liabilities and deficit	$ 2,707.9	$ 2,504

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
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	150,000,000
Common stock, shares issued (in shares)	66,800,000	65,900,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Consolidated net income (loss) from continuing operations	$ (317.2)	$ (88.3)	$ 25
Income from discontinued operations, net of tax	1,068.4	75	53.9
Adjustments to reconcile consolidated net income (loss) to net cash (used for) provided by operating activities:
Gain on sale of U.S. Federal business	(1,060)	0	0
Foreign currency translation losses	36.2	11	7.4
Non-cash interest expense	4.6	9.2	10.5
Debt extinguishment charge	28.5	20.1	0
Employee stock compensation	14.5	13.2	13.2
Depreciation and amortization of properties	29.7	35.3	40.4
Depreciation and amortization of outsourcing assets	65.8	63.8	66.8
Amortization of marketable software	65.5	48.3	56.9
Other non-cash operating activities	(0.3)	(1.6)	(4.8)
Loss on disposal of capital assets	4.5	1.5	0.8
Gain on sale of properties	0	0	(7.3)
Postretirement contributions	(832.2)	(109.4)	(138.7)
Postretirement expense	239.2	96.6	84.1
Deferred income taxes, net	(13.4)	4.4	8.2
Changes in operating assets and liabilities:
Receivables, net and contract assets	(74.8)	(8.3)	(50.5)
Inventories	3	6.1	(5.5)
Other assets	5.9	9.9	(23.9)
Accounts payable and current liabilities	3.4	(114.4)	(62.2)
Other liabilities	47.5	51.5	(0.4)
Net cash (used for) provided by operating activities	(681.2)	123.9	73.9
Cash flows from investing activities
Net proceeds from sale of U.S. Federal business	1,162.9	0	0
Proceeds from investments	3,388.5	3,568.9	3,708
Purchases of investments	(3,379.2)	(3,566.1)	(3,722)
Capital additions of properties	(27.7)	(38)	(35.6)
Capital additions of outsourcing assets	(30.1)	(48.8)	(73)
Investment in marketable software	(72.3)	(73)	(80.7)
Net proceeds from sale of properties	0	(0.3)	19.2
Other	(0.5)	(0.9)	(0.9)
Net cash provided by (used for) investing activities	1,041.6	(158.2)	(185)
Cash flows from financing activities
Payments of long-term debt	(454.8)	(14.4)	(2.3)
Proceeds from issuance of long-term debt	497.3	30.5	0
Cash paid in connection with debt extinguishment	(23.7)	(56.7)	0
Issuance costs relating to long-term debt	(7.9)	0	0
Proceeds from capped call transactions	0	7.2	0
Other	(5.8)	(4.6)	(2.5)
Net cash provided by (used for) financing activities	5.1	(38)	(4.8)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(10.6)	0	(24.1)
Increase (decrease) in cash, cash equivalents and restricted cash	354.9	(72.3)	(140)
Cash, cash equivalents and restricted cash, beginning of year	551.8	624.1	764.1
Cash, cash equivalents and restricted cash, end of year	$ 906.7	$ 551.8	$ 624.1

Consolidated Statements of Defi

Consolidated Statements of Deficit - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ (1,228.3)	$ (1,299.6)	$ (1,326.5)
Reclassification pursuant to ASU No. 2018-02			0
Consolidated net income (loss)	751.2	(13.3)	78.9
Stock-based activity	8.8	8	11.1
Debt exchange		83.9
Capped call on debt exchange		7.2
Translation adjustments	49.3	24.4	(81.8)
Postretirement plans	106.9	(38.9)	33.8
Ending Balance	(312.1)	(1,228.3)	(1,299.6)
ASU No. 2014-09 | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(21.4)
ASU No. 2017-05 | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			6.3
Total Unisys Corporation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(1,265.4)	(1,343.5)	(1,354.7)
Reclassification pursuant to ASU No. 2018-02			0
Consolidated net income (loss)	750.7	(17.2)	75.5
Stock-based activity	8.8	8	11.1
Debt exchange		83.9
Capped call on debt exchange		7.2
Translation adjustments	46.3	23.8	(79.7)
Postretirement plans	102.8	(27.6)	19.4
Ending Balance	(356.8)	(1,265.4)	(1,343.5)
Total Unisys Corporation | ASU No. 2014-09 | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(21.4)
Total Unisys Corporation | ASU No. 2017-05 | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			6.3
Common Stock Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	0.7	0.5	0.5
Stock-based activity		0.1
Debt exchange		0.1
Ending Balance	0.7	0.7	0.5
Accumu-lated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(1,711.2)	(1,694)	(1,963.1)
Reclassification pursuant to ASU No. 2018-02			208.7
Consolidated net income (loss)	750.7	(17.2)	75.5
Ending Balance	(960.5)	(1,711.2)	(1,694)
Accumu-lated Deficit | ASU No. 2014-09 | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(21.4)
Accumu-lated Deficit | ASU No. 2017-05 | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			6.3
Treasury Stock At Cost
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(109.6)	(105)	(102.7)
Stock-based activity	(4.8)	(4.6)	(2.3)
Ending Balance	(114.4)	(109.6)	(105)
Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	4,643.3	4,539.8	4,526.4
Stock-based activity	13.6	12.5	13.4
Debt exchange		83.8
Capped call on debt exchange		7.2
Ending Balance	4,656.9	4,643.3	4,539.8
Accumu-lated Other Compre-hensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(4,088.6)	(4,084.8)	(3,815.8)
Reclassification pursuant to ASU No. 2018-02			(208.7)
Translation adjustments	46.3	23.8	(79.7)
Postretirement plans	102.8	(27.6)	19.4
Ending Balance	(3,939.5)	(4,088.6)	(4,084.8)
Non-controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	37.1	43.9	28.2
Consolidated net income (loss)	0.5	3.9	3.4
Stock-based activity
Translation adjustments	3	0.6	(2.1)
Postretirement plans	4.1	(11.3)	14.4
Ending Balance	$ 44.7	$ 37.1	$ 43.9

Summary of significant accounti

Summary of significant accounting policies	12 Months Ended
	Dec. 31, 2020
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 generally accepted accounting principles in the United States of America (GAAP) 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 estimated credit losses, contract assets, operating lease right-of-use assets, outsourcing assets, marketable software, goodwill and other long-lived assets, legal contingencies, assumptions used in the calculation 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 materially 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. The company assessed certain accounting matters that generally require consideration of forecasted financial information in context with the information reasonably available to us and the unknown future impacts of COVID-19 as of December 31, 2020 and through the date of this report. The accounting matters assessed included, but were not limited to the valuation of estimated credit losses, contract assets, outsourcing assets, marketable software, goodwill and other long-lived assets, and retirement and other post-employment benefits. While there was not a material impact to our consolidated financial position as of December 31, 2020 resulting from our assessments, our future assessment of our current expectations at that time of the magnitude and duration of COVID-19, as well as other factors, could result in material impacts to our consolidated financial position in future reporting periods. Cash and Cash equivalents Cash and cash equivalents consist of cash on hand, short-term investments purchased with an original 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. 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, 2020 2019 Cash and cash equivalents $ 898.5 $ 538.8 Restricted cash 8.2 13.0 Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 906.7 $ 551.8 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. Outsourcing assets Costs of 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 these costs is subject to various business risks. Quarterly, the company compares the carrying value of these assets with the undiscounted future cash flows expected to be generated by them to determine if there is impairment. If impaired, these 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. 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. Effective January 1, 2019, the company changed the estimated revenue-producing lives of the company’s proprietary enterprise software products from three years to five years. This change in estimate was applied prospectively and resulted in a $19.8 million decrease to cost of revenue in 2019. For the company’s proprietary enterprise software products, the amortization period is five years following product release, and for the remaining products, the amortization period is three years following product release. In assessing the estimated revenue-producing lives and recoverability of the products, the company considers operating strategies, underlying technologies utilized, estimated economic life and external market factors, such as expected levels of competition, barriers to entry by potential competitors, stability in the market and governmental regulation. The company continually reassesses the estimated revenue-producing lives of the products and any change in the company’s estimate could result in the remaining amortization expense being accelerated or spread out over a longer period. As of December 31, 2020, the company believes that all unamortized costs are fully recoverable. 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. 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. The company tests goodwill for impairment annually in the fourth quarter using data as of September 30 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. The company estimates 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, the company gives more weighting to the income approach. The higher weighting assigned to the income approach takes 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. 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. Management develops the actuarial assumptions used by its U.S. and international defined benefit pension plan obligations based upon the circumstances of each particular plan. The determination of the defined benefit pension plan obligations requires the use of estimates. 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. Management’s significant assumption used in the determination of the defined benefit pension plan obligations, and settlement losses associated with respect to the U.S. pension plans, is the discount rate. Inherent in deriving the discount rate are significant assumptions with respect to the timing and magnitude of expected benefit payment obligations. 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. 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. Revenue recognition Revenue is recognized at an amount that reflects the consideration to which the company expects to be entitled in exchange for transferring goods and services to a customer. The company determines revenue recognition using the following five steps: (1) identify the contract(s) with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when (or as) the company satisfies a performance obligation. Revenue excludes taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue producing transaction and collected by the company from a customer (e.g., sales, use and value-added taxes). Revenue includes payments for shipping and handling activities. At contract inception, the company assesses the goods and services promised in a contract with a customer and identifies as a performance obligation each promise to transfer to the customer either: (1) a good or service (or a bundle of goods or services) that is distinct or (2) a series of distinct goods or services that are substantially the same and that have the same pattern of transfer to the customer. The company recognizes revenue only when it satisfies a performance obligation by transferring a promised good or service to a customer. The company must apply its judgment to determine the timing of the satisfaction of performance obligations as well as the transaction price and the amounts allocated to performance obligations including estimating variable consideration, adjusting the consideration for the effects of the time value of money and assessing whether an estimate of variable consideration is constrained. Revenue from hardware sales is recognized upon the transfer of control to a customer, which is defined as an entity’s ability to direct the use of and obtain substantially all of the remaining benefits of an asset. Revenue from software licenses is recognized at the inception of either the initial license term or the inception of an extension or renewal to the license term. 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 over time as the company transfers control of goods or services. The company measures its progress toward satisfaction of its performance obligations using the cost-to-cost method, or when services have been performed, depending on the nature of the project. For contracts accounted for using the cost-to-cost method, 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. In services arrangements, the company typically satisfies the performance obligation and recognizes revenue over time, because the client simultaneously receives and consumes the benefits provided as the company performs the services. The company’s services are provided on a time-and-materials basis, as a fixed-price contract or as a fixed-price per measure of output contract. Revenue from time-and-material contracts is recognized on an output basis as labor hours are delivered and/or direct expenses are incurred. In outsourcing contracts, including managed services, application management, business process outsourcing and other cloud-based services arrangements, the arrangement generally consists of a single performance obligation comprised of services that are substantially the same and that have the same pattern of transfer. The company applies a measure of progress (typically time-based) to any fixed consideration and allocates variable consideration to the periods of service based on usage. As a result, revenue is generally recognized over the period the services are provided either on a straight-line basis or on a usage basis, depending on the terms of the arrangement (such as whether the company is standing ready to perform or whether the contract has usage-based metrics). This results in revenue recognition that corresponds with the value to the client of the services transferred to date relative to the remaining services promised. The company also enters into arrangements, which may include any combination of hardware, software 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 performance obligations, with control over hardware and software transferred in one reporting period and the software support and hardware maintenance services performed 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 hardware and license software products to the client. The services are provided on a continuous basis across multiple reporting periods and control over the hardware and software products occurs in one reporting period. To the extent that a performance obligation in an arrangement is subject to specific guidance, that performance obligation is accounted for in accordance with such specific guidance. An example of such an arrangement may include leased assets which are subject to specific leasing accounting guidance. The company allocates the total transaction price to be earned under an arrangement among the various performance obligations in proportion to their standalone selling prices (relative standalone selling price basis). The standalone selling price for a performance obligation is the price at which the company would sell a promised good or service separately to a customer. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. Many of the company’s contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and, therefore, not distinct. For contracts with multiple performance obligations, the company allocates the contract’s transaction price to each performance obligation using its best estimate of the standalone selling price of each distinct good or service in the contract. The primary methods used to estimate standalone selling price are as follows: (1) the expected cost plus margin approach, under which the company forecasts its expected costs of satisfying a performance obligation and then adds an appropriate margin for that distinct good or service and (2) the percent discount off of list price approach. In the Services segment, substantially all of the company’s performance obligations are satisfied over time as work progresses and therefore substantially all of the revenue in this segment is recognized over time. The company generally receives payment for these contracts over time as the performance obligations are satisfied. In the Technology segment, substantially all of the company’s goods and services are transferred to customers at a single point in time. Revenue on these contracts is recognized when control over the product is transferred to the customer or a software license term begins. The company generally receives payment for these contracts upon signature or within 30 to 60 days. The company discloses disaggregation of its customer revenue by geographic areas and by classes of similar products and services, by segment (see Note 20). The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables, contract assets and deferred revenue (contract liabilities). Advertising costs All advertising costs are expensed as incurred. Shipping and handling Costs related to shipping and handling are included in cost of revenue. Stock-based compensation plans Stock-based compensation represents the cost related to stock-based awards granted to employees and directors. Compensation expense for performance-based restricted stock unit awards is recognized as expense ratably for each installment from the date of the 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. Compensation expense for market-based awards is recognized as expense ratably over the measurement period, regardless of the actual level of achievement, provided the service requirement is met. The fair value of restricted stock units with time and performance conditions is determined based on the trading price of the company’s common shares on the date of grant. The fair value of awards with market conditions is estimated using a Monte Carlo simulation. 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 expense is recorded in selling, general and administrative expenses. 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 releases the income tax effects of deferred tax balances that have a valuation allowance from accumulated other comprehensive income once the reason the tax effects were established ceases to exist (e.g., a postretirement plan is liquidated). The company recognizes penalties and interest accrued related to income tax liabilities in provision for income taxes in its consolidated statements of income. The company treats the global intangible low-taxed income tax, or GILTI, as a period cost when included in U.S. taxable income, and the base erosion and anti-abuse tax, or BEAT, as a period cost when incurred. 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 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 expense, net. 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 derivatives (see Note 12), long-term debt (see Note 15), and to its postretirement plan assets (see Note 17).

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations On March 13, 2020, the company completed the sale of its U.S. Federal business to Science Applications International Corporation for cash of $1.2 billion. Net cash proceeds of the sale was $1,162.9 million (net of working capital adjustments and transaction costs). The company’s consolidated financial statements have been retroactively reclassified to report the U.S. Federal business as discontinued operations. As a result, all items relating to the business within the consolidated statements of income (loss) have been reported as income from discontinued operations, net of tax, and all items relating to the business within the consolidated balance sheets have been reported as either assets or liabilities of discontinued operations. In addition, all items related to the business within the relevant notes to the consolidated financial statements have been recast to reflect the effects of the discontinued operations. Depreciation, amortization, capital expenditures, and significant noncash operating and investing activities related to the U.S. Federal business were immaterial for all periods presented. The results of the U.S. Federal business discontinued operations were as follows: Year ended December 31, 2020* 2019 2018 Revenue $ 149.5 $ 725.9 $ 573.8 Income (loss) Operations 8.4 100.3 72.2 Gain on sale 1,060.7 — — 1,069.1 100.3 72.2 Income tax provision 0.7 25.3 18.3 Income from discontinued operations, net of tax $ 1,068.4 $ 75.0 $ 53.9 * Includes results of operations through the March 13, 2020 closing date.

Recent accounting pronouncement

Recent accounting pronouncements and accounting changes	12 Months Ended
	Dec. 31, 2020
Accounting Changes and Error Corrections [Abstract]
Recent accounting pronouncements and accounting changes	Recent accounting pronouncements and accounting changesEffective January 1, 2020, the company adopted ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract which clarifies the accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. The company adopted the new guidance on a prospective basis and the adoption did not have a material impact on its consolidated results of operations and financial position. Effective January 1, 2020, the company adopted 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, contract assets, loans and other financial instruments. The adoption did not have a material impact on the company’s consolidated results of operations and financial position. Effective January 1, 2020, the company adopted ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes which removed certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The new standard was applied to the presentation of the company’s U.S. Federal business, which is reflected in discontinued operations.

Cost-reduction actions

Cost-reduction actions	12 Months Ended
	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
Cost-reduction actions	Cost-reduction actions During 2020, the company recognized cost-reduction charges and other costs of $95.5 million. The charges (credits) related to work-force reductions were $25.5 million, principally related to severance costs, and were comprised of: (a) a charge of $39.0 million and (b) a credit of $13.5 million for changes in estimates. In addition, the company recorded charges of $70.0 million comprised of $32.3 million for foreign currency losses related to exiting foreign countries, $24.0 million for asset impairments and $13.7 million for other expenses related to the cost-reduction effort. During 2019, the company recognized cost-reduction charges and other costs of $28.7 million. The charges related to work-force reductions were $22.1 million, principally related to severance costs, and were comprised of: (a) a charge of $25.7 million and (b) a credit of $3.6 million for changes in estimates. In addition, the company recorded charges of $6.6 million comprised of $4.6 million for lease abandonment costs, $1.1 million for asset write-offs and $0.9 million for other expenses related to the cost-reduction effort. During 2018, the company recognized cost-reduction charges and other costs of $19.7 million. The charges related to work-force reductions were $19.0 million, principally related to severance costs, and were comprised of: (a) a charge of $27.7 million and (b) a credit of $8.7 million for changes in estimates. In addition, the company recorded a charge of $0.7 million for changes in estimates related to idle leased facilities costs. The charges (credits) were recorded in the following statement of income classifications: Year ended December 31, 2020 2019 2018 Cost of revenue Services $ 22.2 $ 10.8 $ 18.1 Technology — 0.2 — Selling, general and administrative 38.5 15.5 1.6 Research and development 2.5 2.2 — Other (expenses), net 32.3 — — Total $ 95.5 $ 28.7 $ 19.7 Liabilities and expected future payments related to the company’s work-force reduction actions are as follows: Total U.S. International Balance at December 31, 2017 $ 113.5 $ 3.9 $ 109.6 Additional provisions 27.7 5.2 22.5 Payments (42.4) (3.1) (39.3) Changes in estimates (8.7) 0.1 (8.8) Translation adjustments (3.9) — (3.9) Balance at December 31, 2018 86.2 6.1 80.1 Additional provisions 25.7 4.6 21.1 Payments (57.7) (4.0) (53.7) Changes in estimates (3.6) (1.5) (2.1) Translation adjustments (0.8) — (0.8) Balance at December 31, 2019 49.8 5.2 44.6 Additional provisions 39.0 13.8 25.2 Payments (21.5) (3.2) (18.3) Changes in estimates (13.5) (2.7) (10.8) Translation adjustments 2.1 — 2.1 Balance at December 31, 2020 $ 55.9 $ 13.1 $ 42.8 Expected future payments on balance at December 31, 2020: In 2021 $ 40.7 $ 13.1 $ 27.6 Beyond 2021 15.2 — 15.2

Leases and commitments

Leases and commitments	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Leases and commitments	Leases and commitments Leases The company determines if an arrangement is a lease at inception. This determination generally depends on whether the arrangement conveys to the company the right to control the use of an explicitly or implicitly identified asset for a period of time in exchange for consideration. Control of an underlying asset is conveyed to the company if the company obtains the rights to direct the use of and to obtain substantially all of the economic benefits from using the underlying asset. The company is the lessee in lease agreements that include lease and non-lease components, which the company accounts for as a single lease component for all personal property leases. The company also has lease agreements in which it is the lessor that include lease and non-lease components. For these agreements, the company accounts for these components as a single lease component. Lease expense for variable leases and short-term leases is recognized when the expense is incurred. Operating leases are included in operating lease right-of-use (ROU) assets, other accrued liabilities and long-term operating lease liabilities on the consolidated balance sheets. Operating lease ROU assets and lease liabilities are recognized at the commencement date of the lease based on the present value of lease payments over the lease term. Operating lease payments are recognized as lease expense on a straight-line basis over the lease term. Finance leases are included in outsourcing assets, net and long-term debt on the consolidated balance sheets. Finance lease ROU assets and lease liabilities are initially measured in the same manner as operating leases. Finance lease ROU assets are amortized using the straight-line method. Finance lease liabilities are measured at amortized cost using the effective interest method. The company has not capitalized leases with terms of twelve months or less. As most of the company’s leases do not provide an implicit rate, the company uses its incremental borrowing rate, based on the information available at the lease commencement date, in determining the present value of lease payments. The company determines the incremental borrowing rate using the portfolio approach considering lease term and lease currency. The lease term for all of the company’s leases includes the non-cancelable period of the lease plus any additional periods covered by either a company option to extend (or not to terminate) the lease that the company is reasonably certain to exercise, or an option to extend (or not to terminate) the lease controlled by the lessor. Lease payments included in the measurement of the lease liability are comprised of fixed payments, variable payments that depend on index or rate, amounts expected to be payable under a residual value guarantee and the exercise of the company option to purchase the underlying asset, if reasonably certain. Variable lease payments associated with the company’s leases are recognized when the event, activity, or circumstance in the lease agreement on which those payments are assessed occurs. Variable lease payments are presented as an operating expense in the company’s consolidated results of operations in the same line item as expense arising from fixed lease payments (operating leases) or amortization of the ROU asset (finance leases). The company uses the long-lived assets impairment guidance in ASC Subtopic 360-10 Property, Plant, and Equipment to determine whether a ROU asset is impaired, and if so, the amount of the impairment loss to recognize. If impaired, ROU assets for operating and finance leases are reduced for any impairment losses. The company monitors for events or changes in circumstances that require a reassessment of its leases. When a reassessment results in the remeasurement of a lease liability, a corresponding adjustment is made to the carrying amount of the corresponding ROU asset unless doing so would reduce the carrying amount of the ROU asset to an amount less than zero. In that case, the amount of the adjustment that would result in a negative ROU asset balance is recorded in the consolidated statement of income. The company has commitments under operating leases for certain facilities and equipment used in its operations. The company also has finance leases for equipment. The company’s leases generally have initial lease terms ranging from 1 year to 8 years, most of which include options to extend or renew the leases for up to 5 years, and some of which may include options to terminate the leases within 1 year. Certain lease agreements contain provisions for future rent increases. The components of lease expense are as follows: Year ended December 31, 2020 2019 Operating lease cost $ 42.3 $ 37.9 Finance lease cost Amortization of right-of-use assets 1.7 1.6 Interest on lease liabilities 0.2 0.3 Total finance lease cost 1.9 1.9 Short-term lease costs 1.4 0.6 Variable lease cost 10.3 13.7 Sublease income (12.1) (0.7) Total lease cost $ 43.8 $ 53.4 Effective January 1, 2019, the Company adopted ASU 2016-02. Prior-period results were not restated. Rental expense and income from subleases for the year ended December 31, 2018, prior to the adoption of ASU 2016-02 were as follows: Year ended December 31, 2018 Rental expense, less income from subleases $ 55.5 Income from subleases $ 3.1 Supplemental balance sheet information related to leases is as follows: As of December 31, 2020 2019 Operating Leases Operating lease right-of-use assets $ 79.3 $ 71.4 Other accrued liabilities 37.1 34.1 Long-term operating lease liabilities 62.4 56.0 Total operating lease liabilities $ 99.5 $ 90.1 Finance Leases Outsourcing assets, net $ 2.9 $ 4.6 Current maturities of long-term debt 2.4 1.8 Long-term debt 3.1 3.5 Total finance lease liabilities $ 5.5 $ 5.3 Weighted-Average Remaining Lease Term (in years) Operating leases 2.3 3.4 Finance leases 2.0 3.0 Weighted-Average Discount Rate Operating leases 6.4 % 6.4 % Finance leases 5.2 % 5.0 % Supplemental cash flow information related to leases is as follows: Years ended December 31, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Cash payments for operating leases included in operating activities $ 41.6 $ 42.1 Cash payments for finance leases included in financing activities 1.8 1.7 Cash payments for finance lease included in operating activities 0.2 0.3 ROU assets obtained in exchange for lease obligations are as follows: Years ended December 31, 2020 2019 Operating leases $ 40.9 $ 17.4 Finance leases — 1.5 Maturities of lease liabilities as of December 31, 2020 are as follows: Year Finance Leases Operating Leases 2021 $ 2.6 $ 40.8 2022 2.0 33.6 2023 0.7 19.6 2024 0.4 9.0 2025 — 4.4 Thereafter — 0.8 Total lease payments 5.7 108.2 Less imputed interest 0.2 8.7 Total $ 5.5 $ 99.5 For transactions where the company is considered the lessor, 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. These amounts were immaterial for all periods presented. As of December 31, 2020, receivables under sales-type leases before the allowance for unearned income were collectible as follows: Year 2021 $ 14.9 2022 26.5 2023 16.4 2024 16.6 2025 10.1 Thereafter 3.2 Total $ 87.7 Other Commitments At December 31, 2020, the company had outstanding standby letters of credit and surety bonds totaling approximately $191 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, 2020, the company had deposits and collateral of approximately $8 million in other long-term assets, principally related to tax contingencies in Brazil.
Leases and commitments	Leases and commitments Leases The company determines if an arrangement is a lease at inception. This determination generally depends on whether the arrangement conveys to the company the right to control the use of an explicitly or implicitly identified asset for a period of time in exchange for consideration. Control of an underlying asset is conveyed to the company if the company obtains the rights to direct the use of and to obtain substantially all of the economic benefits from using the underlying asset. The company is the lessee in lease agreements that include lease and non-lease components, which the company accounts for as a single lease component for all personal property leases. The company also has lease agreements in which it is the lessor that include lease and non-lease components. For these agreements, the company accounts for these components as a single lease component. Lease expense for variable leases and short-term leases is recognized when the expense is incurred. Operating leases are included in operating lease right-of-use (ROU) assets, other accrued liabilities and long-term operating lease liabilities on the consolidated balance sheets. Operating lease ROU assets and lease liabilities are recognized at the commencement date of the lease based on the present value of lease payments over the lease term. Operating lease payments are recognized as lease expense on a straight-line basis over the lease term. Finance leases are included in outsourcing assets, net and long-term debt on the consolidated balance sheets. Finance lease ROU assets and lease liabilities are initially measured in the same manner as operating leases. Finance lease ROU assets are amortized using the straight-line method. Finance lease liabilities are measured at amortized cost using the effective interest method. The company has not capitalized leases with terms of twelve months or less. As most of the company’s leases do not provide an implicit rate, the company uses its incremental borrowing rate, based on the information available at the lease commencement date, in determining the present value of lease payments. The company determines the incremental borrowing rate using the portfolio approach considering lease term and lease currency. The lease term for all of the company’s leases includes the non-cancelable period of the lease plus any additional periods covered by either a company option to extend (or not to terminate) the lease that the company is reasonably certain to exercise, or an option to extend (or not to terminate) the lease controlled by the lessor. Lease payments included in the measurement of the lease liability are comprised of fixed payments, variable payments that depend on index or rate, amounts expected to be payable under a residual value guarantee and the exercise of the company option to purchase the underlying asset, if reasonably certain. Variable lease payments associated with the company’s leases are recognized when the event, activity, or circumstance in the lease agreement on which those payments are assessed occurs. Variable lease payments are presented as an operating expense in the company’s consolidated results of operations in the same line item as expense arising from fixed lease payments (operating leases) or amortization of the ROU asset (finance leases). The company uses the long-lived assets impairment guidance in ASC Subtopic 360-10 Property, Plant, and Equipment to determine whether a ROU asset is impaired, and if so, the amount of the impairment loss to recognize. If impaired, ROU assets for operating and finance leases are reduced for any impairment losses. The company monitors for events or changes in circumstances that require a reassessment of its leases. When a reassessment results in the remeasurement of a lease liability, a corresponding adjustment is made to the carrying amount of the corresponding ROU asset unless doing so would reduce the carrying amount of the ROU asset to an amount less than zero. In that case, the amount of the adjustment that would result in a negative ROU asset balance is recorded in the consolidated statement of income. The company has commitments under operating leases for certain facilities and equipment used in its operations. The company also has finance leases for equipment. The company’s leases generally have initial lease terms ranging from 1 year to 8 years, most of which include options to extend or renew the leases for up to 5 years, and some of which may include options to terminate the leases within 1 year. Certain lease agreements contain provisions for future rent increases. The components of lease expense are as follows: Year ended December 31, 2020 2019 Operating lease cost $ 42.3 $ 37.9 Finance lease cost Amortization of right-of-use assets 1.7 1.6 Interest on lease liabilities 0.2 0.3 Total finance lease cost 1.9 1.9 Short-term lease costs 1.4 0.6 Variable lease cost 10.3 13.7 Sublease income (12.1) (0.7) Total lease cost $ 43.8 $ 53.4 Effective January 1, 2019, the Company adopted ASU 2016-02. Prior-period results were not restated. Rental expense and income from subleases for the year ended December 31, 2018, prior to the adoption of ASU 2016-02 were as follows: Year ended December 31, 2018 Rental expense, less income from subleases $ 55.5 Income from subleases $ 3.1 Supplemental balance sheet information related to leases is as follows: As of December 31, 2020 2019 Operating Leases Operating lease right-of-use assets $ 79.3 $ 71.4 Other accrued liabilities 37.1 34.1 Long-term operating lease liabilities 62.4 56.0 Total operating lease liabilities $ 99.5 $ 90.1 Finance Leases Outsourcing assets, net $ 2.9 $ 4.6 Current maturities of long-term debt 2.4 1.8 Long-term debt 3.1 3.5 Total finance lease liabilities $ 5.5 $ 5.3 Weighted-Average Remaining Lease Term (in years) Operating leases 2.3 3.4 Finance leases 2.0 3.0 Weighted-Average Discount Rate Operating leases 6.4 % 6.4 % Finance leases 5.2 % 5.0 % Supplemental cash flow information related to leases is as follows: Years ended December 31, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Cash payments for operating leases included in operating activities $ 41.6 $ 42.1 Cash payments for finance leases included in financing activities 1.8 1.7 Cash payments for finance lease included in operating activities 0.2 0.3 ROU assets obtained in exchange for lease obligations are as follows: Years ended December 31, 2020 2019 Operating leases $ 40.9 $ 17.4 Finance leases — 1.5 Maturities of lease liabilities as of December 31, 2020 are as follows: Year Finance Leases Operating Leases 2021 $ 2.6 $ 40.8 2022 2.0 33.6 2023 0.7 19.6 2024 0.4 9.0 2025 — 4.4 Thereafter — 0.8 Total lease payments 5.7 108.2 Less imputed interest 0.2 8.7 Total $ 5.5 $ 99.5 For transactions where the company is considered the lessor, 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. These amounts were immaterial for all periods presented. As of December 31, 2020, receivables under sales-type leases before the allowance for unearned income were collectible as follows: Year 2021 $ 14.9 2022 26.5 2023 16.4 2024 16.6 2025 10.1 Thereafter 3.2 Total $ 87.7 Other Commitments At December 31, 2020, the company had outstanding standby letters of credit and surety bonds totaling approximately $191 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, 2020, the company had deposits and collateral of approximately $8 million in other long-term assets, principally related to tax contingencies in Brazil.
Leases and commitments	Leases and commitments Leases The company determines if an arrangement is a lease at inception. This determination generally depends on whether the arrangement conveys to the company the right to control the use of an explicitly or implicitly identified asset for a period of time in exchange for consideration. Control of an underlying asset is conveyed to the company if the company obtains the rights to direct the use of and to obtain substantially all of the economic benefits from using the underlying asset. The company is the lessee in lease agreements that include lease and non-lease components, which the company accounts for as a single lease component for all personal property leases. The company also has lease agreements in which it is the lessor that include lease and non-lease components. For these agreements, the company accounts for these components as a single lease component. Lease expense for variable leases and short-term leases is recognized when the expense is incurred. Operating leases are included in operating lease right-of-use (ROU) assets, other accrued liabilities and long-term operating lease liabilities on the consolidated balance sheets. Operating lease ROU assets and lease liabilities are recognized at the commencement date of the lease based on the present value of lease payments over the lease term. Operating lease payments are recognized as lease expense on a straight-line basis over the lease term. Finance leases are included in outsourcing assets, net and long-term debt on the consolidated balance sheets. Finance lease ROU assets and lease liabilities are initially measured in the same manner as operating leases. Finance lease ROU assets are amortized using the straight-line method. Finance lease liabilities are measured at amortized cost using the effective interest method. The company has not capitalized leases with terms of twelve months or less. As most of the company’s leases do not provide an implicit rate, the company uses its incremental borrowing rate, based on the information available at the lease commencement date, in determining the present value of lease payments. The company determines the incremental borrowing rate using the portfolio approach considering lease term and lease currency. The lease term for all of the company’s leases includes the non-cancelable period of the lease plus any additional periods covered by either a company option to extend (or not to terminate) the lease that the company is reasonably certain to exercise, or an option to extend (or not to terminate) the lease controlled by the lessor. Lease payments included in the measurement of the lease liability are comprised of fixed payments, variable payments that depend on index or rate, amounts expected to be payable under a residual value guarantee and the exercise of the company option to purchase the underlying asset, if reasonably certain. Variable lease payments associated with the company’s leases are recognized when the event, activity, or circumstance in the lease agreement on which those payments are assessed occurs. Variable lease payments are presented as an operating expense in the company’s consolidated results of operations in the same line item as expense arising from fixed lease payments (operating leases) or amortization of the ROU asset (finance leases). The company uses the long-lived assets impairment guidance in ASC Subtopic 360-10 Property, Plant, and Equipment to determine whether a ROU asset is impaired, and if so, the amount of the impairment loss to recognize. If impaired, ROU assets for operating and finance leases are reduced for any impairment losses. The company monitors for events or changes in circumstances that require a reassessment of its leases. When a reassessment results in the remeasurement of a lease liability, a corresponding adjustment is made to the carrying amount of the corresponding ROU asset unless doing so would reduce the carrying amount of the ROU asset to an amount less than zero. In that case, the amount of the adjustment that would result in a negative ROU asset balance is recorded in the consolidated statement of income. The company has commitments under operating leases for certain facilities and equipment used in its operations. The company also has finance leases for equipment. The company’s leases generally have initial lease terms ranging from 1 year to 8 years, most of which include options to extend or renew the leases for up to 5 years, and some of which may include options to terminate the leases within 1 year. Certain lease agreements contain provisions for future rent increases. The components of lease expense are as follows: Year ended December 31, 2020 2019 Operating lease cost $ 42.3 $ 37.9 Finance lease cost Amortization of right-of-use assets 1.7 1.6 Interest on lease liabilities 0.2 0.3 Total finance lease cost 1.9 1.9 Short-term lease costs 1.4 0.6 Variable lease cost 10.3 13.7 Sublease income (12.1) (0.7) Total lease cost $ 43.8 $ 53.4 Effective January 1, 2019, the Company adopted ASU 2016-02. Prior-period results were not restated. Rental expense and income from subleases for the year ended December 31, 2018, prior to the adoption of ASU 2016-02 were as follows: Year ended December 31, 2018 Rental expense, less income from subleases $ 55.5 Income from subleases $ 3.1 Supplemental balance sheet information related to leases is as follows: As of December 31, 2020 2019 Operating Leases Operating lease right-of-use assets $ 79.3 $ 71.4 Other accrued liabilities 37.1 34.1 Long-term operating lease liabilities 62.4 56.0 Total operating lease liabilities $ 99.5 $ 90.1 Finance Leases Outsourcing assets, net $ 2.9 $ 4.6 Current maturities of long-term debt 2.4 1.8 Long-term debt 3.1 3.5 Total finance lease liabilities $ 5.5 $ 5.3 Weighted-Average Remaining Lease Term (in years) Operating leases 2.3 3.4 Finance leases 2.0 3.0 Weighted-Average Discount Rate Operating leases 6.4 % 6.4 % Finance leases 5.2 % 5.0 % Supplemental cash flow information related to leases is as follows: Years ended December 31, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Cash payments for operating leases included in operating activities $ 41.6 $ 42.1 Cash payments for finance leases included in financing activities 1.8 1.7 Cash payments for finance lease included in operating activities 0.2 0.3 ROU assets obtained in exchange for lease obligations are as follows: Years ended December 31, 2020 2019 Operating leases $ 40.9 $ 17.4 Finance leases — 1.5 Maturities of lease liabilities as of December 31, 2020 are as follows: Year Finance Leases Operating Leases 2021 $ 2.6 $ 40.8 2022 2.0 33.6 2023 0.7 19.6 2024 0.4 9.0 2025 — 4.4 Thereafter — 0.8 Total lease payments 5.7 108.2 Less imputed interest 0.2 8.7 Total $ 5.5 $ 99.5 For transactions where the company is considered the lessor, 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. These amounts were immaterial for all periods presented. As of December 31, 2020, receivables under sales-type leases before the allowance for unearned income were collectible as follows: Year 2021 $ 14.9 2022 26.5 2023 16.4 2024 16.6 2025 10.1 Thereafter 3.2 Total $ 87.7 Other Commitments At December 31, 2020, the company had outstanding standby letters of credit and surety bonds totaling approximately $191 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, 2020, the company had deposits and collateral of approximately $8 million in other long-term assets, principally related to tax contingencies in Brazil.

Other (expense), net

Other (expense), net	12 Months Ended
	Dec. 31, 2020
Other Income and Expenses [Abstract]
Other (expense), net	Other (expense), net Other (expense), net is comprised of the following: Year ended December 31, 2020 2019 2018 Postretirement expense* $ (235.9) $ (93.3) $ (80.3) Debt extinguishment charge (28.5) (20.1) — Foreign exchange losses** (36.2) (10.4) (5.9) Environmental costs and other, net (29.0) (12.6) 9.1 Total other expense, net $ (329.6) $ (136.4) $ (77.1) *Includes $142.1 million settlement charge in 2020 related to the U.S. defined benefit pension plans. **Includes $32.3 million for foreign currency losses in 2020 related to substantial completion of liquidation of foreign subsidiaries.

Income taxes

Income taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income taxes	Income taxes Following is the total income (loss) from continuing operations before income taxes and the provision (benefit) for income taxes. Year ended December 31, 2020 2019 2018 Income (loss) from continuing operations before income taxes United States $ (316.3) $ (148.4) $ (125.8) Foreign 44.5 87.8 196.8 Total income (loss) before income taxes from continuing operations $ (271.8) $ (60.6) $ 71.0 Provision (benefit) for income taxes Current United States $ 7.3 $ (17.7) $ (13.6) Foreign 51.5 41.0 51.4 Total 58.8 23.3 37.8 Deferred Foreign (13.4) 4.4 8.2 Total provision for income taxes $ 45.4 $ 27.7 $ 46.0 Following is a reconciliation of the provision (benefit) for income taxes at the United States statutory tax rate to the provision for income taxes as reported: Year ended December 31, 2020 2019 2018 United States statutory income tax provision (benefit) $ (57.1) $ (12.7) $ 14.9 Income and losses for which no provision or benefit has been recognized 78.6 23.9 19.1 Foreign rate differential and other foreign tax expense 5.9 3.2 9.5 Income tax withholdings 16.8 17.6 19.3 Permanent items 0.8 (2.5) (5.0) Enacted rate changes (4.0) 0.5 (2.3) Change in uncertain tax positions 3.6 0.2 (1.2) Change in valuation allowances due to changes in judgment 2.9 (2.3) (5.9) Income tax credits, U.S. (2.1) (0.2) (2.4) Provision for income taxes $ 45.4 $ 27.7 $ 46.0 The tax effects of temporary differences and carryforwards that give rise to significant portions of deferred tax assets and liabilities were as follows: As of December 31, 2020 2019 Deferred tax assets Tax loss carryforwards $ 795.2 $ 841.1 Postretirement benefits 253.0 434.4 Foreign tax credit carryforwards 201.3 211.5 Other tax credit carryforwards 29.2 30.3 Deferred revenue 31.1 42.8 Employee benefits and compensation 25.3 31.2 Purchased capitalized software 24.1 31.2 Depreciation 28.2 28.1 Warranty, bad debts and other reserves 10.5 5.9 Capitalized costs 8.1 7.1 Other 52.0 27.9 1,458.0 1,691.5 Valuation allowance (1,271.5) (1,524.7) Total deferred tax assets $ 186.5 $ 166.8 Deferred tax liabilities Capitalized research and development $ 47.4 $ 44.7 Other 29.8 29.0 Total deferred tax liabilities $ 77.2 $ 73.7 Net deferred tax assets $ 109.3 $ 93.1 During 2020, the company’s valuation allowance declined by $253.2 million principally due to the recognition of a net income tax benefit of $189.0 million including net tax expense of $2.9 million, expired net operating losses/tax credits of $28.9 million, translation adjustments of $(20.9) million and other activity of $56.2 million. At December 31, 2020, the company has tax effected tax loss carryforwards as follows: As of December 31, 2020 U.S. Federal $ 317.6 State and local 200.1 Foreign 277.5 Total tax loss carryforwards $ 795.2 These carryforwards will expire as follows: Year 2021 $ 15.7 2022 17.5 2023 13.6 2024 11.9 2025 13.2 Thereafter 723.3 Total $ 795.2 The company also has available tax credit carryforwards, which will expire as follows: Year 2021 $ 55.9 2022 38.1 2023 27.0 2024 22.5 2025 20.7 Thereafter 66.3 Total $ 230.5 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, distributions from foreign subsidiaries to U.S. shareholders are generally exempt from 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, 2020 approximated $26.6 million. Cash paid for income taxes, net of refunds was as follows: Year ended December 31, 2020 2019 2018 Cash paid for income taxes, net of refunds $ 24.7 $ 37.6 $ 39.1 A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: Year ended December 31, 2020 2019 2018 Balance at January 1 $ 25.6 $ 18.9 $ 27.9 Additions based on tax positions related to the current year 8.5 11.1 2.6 Changes for tax positions of prior years (0.7) (0.6) (6.1) Reductions as a result of a lapse of applicable statute of limitations (2.3) (2.3) (2.4) Settlements (1.8) (1.1) (1.5) Changes due to foreign currency 1.6 (0.4) (1.6) Balance at December 31 $ 30.9 $ 25.6 $ 18.9 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, 2020 and 2019, the company had an accrual of $3.9 million and $3.0 million, respectively, for the payment of penalties and interest. At December 31, 2020, 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 decrease by $2.3 million related to a statute of limitation expiration; 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 2007 are closed. For the most significant jurisdictions outside the U.S., the audit periods through 2015 are closed for Brazil, and the audit periods through 2016 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, 2020 is approximately $346.1 million. This limitation will be applied 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.

Earnings per common share

Earnings per common share	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Earnings per common share	Earnings per common share The following table shows how earnings (loss) per common share attributable to Unisys Corporation was computed for the three years ended December 31, 2020 (shares in thousands). Year ended December 31, 2020 2019 2018 Basic earnings (loss) per common share computation: Net income (loss) from continuing operations attributable to Unisys Corporation $ (317.7) $ (92.2) $ 21.6 Income from discontinued operations, net of tax 1,068.4 75.0 53.9 Net income (loss) attributable to Unisys Corporation $ 750.7 $ (17.2) $ 75.5 Weighted average shares 62,932 55,961 50,946 Basic earnings (loss) per share attributable to Unisys Corporation Continuing operations $ (5.05) $ (1.65) $ 0.42 Discontinued operations 16.98 1.34 1.06 Total $ 11.93 $ (0.31) $ 1.48 Diluted earnings (loss) per common share computation: Net income (loss) from continuing operations attributable to Unisys Corporation $ (317.7) $ (92.2) $ 21.6 Add interest expense on convertible senior notes, net of tax of zero — — — Net income (loss) from continuing operations attributable to Unisys Corporation for diluted earnings per share (317.7) (92.2) 21.6 Income from discontinued operations, net of tax 1,068.4 75.0 53.9 Net income (loss) attributable to Unisys Corporation for diluted earnings per share $ 750.7 $ (17.2) $ 75.5 Weighted average shares 62,932 55,961 50,946 Plus incremental shares from assumed conversions: Employee stock plans — — 541 Convertible senior notes — — — Adjusted weighted average shares 62,932 55,961 51,487 Diluted earnings (loss) per common share attributable to Unisys Corporation Continuing operations $ (5.05) $ (1.65) $ 0.42 Discontinued operations 16.98 1.34 1.05 Total $ 11.93 $ (0.31) $ 1.47 Anti-dilutive weighted-average stock options and restricted stock units (i) 579 1,393 1,226 Anti-dilutive weighted-average common shares issuable upon conversion of the 5.50% convertible senior notes (i) (see Note 15) 3,425 16,578 21,868 (i) 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.

Accounts receivable

Accounts receivable	12 Months Ended
	Dec. 31, 2020
Receivables [Abstract]
Accounts receivable	Accounts receivableAccounts 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 $63.3 million and $60.8 million at December 31, 2020 and 2019, respectively. The allowance for doubtful accounts, which is reported as a deduction from accounts receivable, was $9.2 million and $11.8 million at December 31, 2020 and 2019, respectively. The provision for doubtful accounts, which is reported in selling, general and administrative expenses in the consolidated statements of income, was (income) expense of $(0.3) million, $(1.6) million and $(5.1) million, in 2020, 2019 and 2018, respectively.

Contract assets and deferred re

Contract assets and deferred revenue	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract assets and deferred revenue	Contract assets and deferred revenue Contract assets represent rights to consideration in exchange for goods or services transferred to a customer when that right is conditional on something other than the passage of time. Deferred revenue represents contract liabilities. Net contract assets (liabilities) are as follows: As of December 31, 2020 2019 Contract assets - current $ 44.3 $ 38.4 Contract assets - long-term (i) 20.7 21.6 Deferred revenue - current (257.1) (246.4) Deferred revenue - long-term (137.9) (147.0) (i) Reported in other long-term assets on the company’s consolidated balance sheets Significant changes in the above contract asset and liability balances were as follows: Year ended December 31, 2020 2019 Revenue recognized that was included in deferred revenue at the beginning of the period $ 236.1 $ 270.1 The company’s incremental direct costs of obtaining a contract consist of sales commissions which are deferred and amortized ratably over the initial contract life. These costs are classified as current or noncurrent based on the timing of when the company expects to recognize the expense. The current and noncurrent portions of deferred commissions are included in prepaid expenses and other current assets and in other long-term assets, respectively, in the company’s consolidated balance sheets. Deferred commissions were as follows: As of December 31, 2020 2019 Deferred commissions $ 8.7 $ 9.1 Amortization expense related to deferred commissions was as follows: Year ended December 31, 2020 2019 2018 Deferred commissions - amortization expense (i) $ 3.2 $ 3.1 $ 6.5 (i) Reported in selling, general and administrative expense in the company’s consolidated statements of income Costs on outsourcing contracts are generally expensed as incurred. However, certain costs incurred upon initiation of an outsourcing contract (costs to fulfill a contract), principally initial customer setup, are capitalized and expensed over the initial contract life. These costs are included in outsourcing assets, net in the company’s consolidated balance sheets, and are amortized over the initial contract life and reported in Services cost of sales. Costs to fulfill a contract were as follows: As of December 31, 2020 2019 Costs to fulfill a contract $ 74.4 $ 75.8 Amortization expense related to costs to fulfill a contract was as follows: Year ended December 31, 2020 2019 2018 Costs to fulfill a contract - amortization expense $ 27.5 $ 24.2 $ 21.7 The remaining balance of outsourcing assets, net is comprised of fixed assets and software used in connection with outsourcing contracts. These costs are capitalized and depreciated over the shorter of the initial contract life or in accordance with the company’s fixed asset policy.

Capitalized contract costs

Capitalized contract costs	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Capitalized contract costs	Contract assets and deferred revenue Contract assets represent rights to consideration in exchange for goods or services transferred to a customer when that right is conditional on something other than the passage of time. Deferred revenue represents contract liabilities. Net contract assets (liabilities) are as follows: As of December 31, 2020 2019 Contract assets - current $ 44.3 $ 38.4 Contract assets - long-term (i) 20.7 21.6 Deferred revenue - current (257.1) (246.4) Deferred revenue - long-term (137.9) (147.0) (i) Reported in other long-term assets on the company’s consolidated balance sheets Significant changes in the above contract asset and liability balances were as follows: Year ended December 31, 2020 2019 Revenue recognized that was included in deferred revenue at the beginning of the period $ 236.1 $ 270.1 The company’s incremental direct costs of obtaining a contract consist of sales commissions which are deferred and amortized ratably over the initial contract life. These costs are classified as current or noncurrent based on the timing of when the company expects to recognize the expense. The current and noncurrent portions of deferred commissions are included in prepaid expenses and other current assets and in other long-term assets, respectively, in the company’s consolidated balance sheets. Deferred commissions were as follows: As of December 31, 2020 2019 Deferred commissions $ 8.7 $ 9.1 Amortization expense related to deferred commissions was as follows: Year ended December 31, 2020 2019 2018 Deferred commissions - amortization expense (i) $ 3.2 $ 3.1 $ 6.5 (i) Reported in selling, general and administrative expense in the company’s consolidated statements of income Costs on outsourcing contracts are generally expensed as incurred. However, certain costs incurred upon initiation of an outsourcing contract (costs to fulfill a contract), principally initial customer setup, are capitalized and expensed over the initial contract life. These costs are included in outsourcing assets, net in the company’s consolidated balance sheets, and are amortized over the initial contract life and reported in Services cost of sales. Costs to fulfill a contract were as follows: As of December 31, 2020 2019 Costs to fulfill a contract $ 74.4 $ 75.8 Amortization expense related to costs to fulfill a contract was as follows: Year ended December 31, 2020 2019 2018 Costs to fulfill a contract - amortization expense $ 27.5 $ 24.2 $ 21.7 The remaining balance of outsourcing assets, net is comprised of fixed assets and software used in connection with outsourcing contracts. These costs are capitalized and depreciated over the shorter of the initial contract life or in accordance with the company’s fixed asset policy.

Financial instruments and conce

Financial instruments and concentration of credit risks	12 Months Ended
	Dec. 31, 2020
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, 2020 and 2019, the notional amount of these contracts was $588.5 million and $437.0 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, 2020 2019 Balance Sheet Location Prepaid expenses and other current assets $ 1.4 $ 2.1 Other accrued liabilities 1.0 0.1 Total fair value $ 0.4 $ 2.0 The following table summarizes the location and amount of gains and losses recognized on foreign exchange forward contracts. Year Ended December 31, 2020 2019 2018 Statement of Income Location Other (expense), net $ 7.6 $ 1.7 $ (14.2)

Properties

Properties	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Properties	Properties Properties comprise the following: As of December 31, 2020 2019 Land $ 2.3 $ 2.3 Buildings 63.5 63.5 Machinery and office equipment 466.7 521.5 Internal-use software 171.2 161.8 Rental equipment 23.3 34.9 Total properties $ 727.0 $ 784.0

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill During the fourth quarter of 2020, the company performed its annual impairment test of goodwill for all of its reporting units. The fair values of each of the reporting units exceeded their carrying values; therefore, no goodwill impairment was required. At December 31, 2020, the amount of goodwill allocated to reporting units with negative net assets was as follows: Business Process Outsourcing Services, $10.3 million. Changes in the carrying amount of goodwill by segment were as follows: Total Services Technology Balance at December 31, 2018 $ 111.0 $ 10.9 $ 100.1 Translation adjustments (0.6) (0.6) — Balance at December 31, 2019 110.4 10.3 100.1 Translation adjustments (1.8) — (1.8) Balance at December 31, 2020 $ 108.6 $ 10.3 $ 98.3

Debt

Debt	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Debt	Debt Long-term debt is comprised of the following: As of December 31, 2020 2019 6.875% senior secured notes due November 1, 2027 (Face value of $485.0 million less unamortized issuance costs of $8.1 million at December 31, 2020) $ 476.9 $ — 5.50% convertible senior notes due March 1, 2021 (Face value of $84.2 million less unamortized discount and issuance costs of $0.6 million and $4.2 million at December 31, 2020 and 2019, respectively) 83.6 80.0 10.75% senior secured notes ($440.0 million face value less unamortized issuance costs of $5.5 million at December 31, 2019) — 434.5 Finance leases 5.5 5.3 Other debt 63.9 59.6 Total 629.9 579.4 Less – current maturities 102.8 13.5 Total long-term debt $ 527.1 $ 565.9 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, 2020 2019 6.875% senior secured notes due November 1, 2027 $ 532.3 $ — 5.50% convertible senior notes due March 1, 2021 169.8 115.8 10.75% senior secured notes — 474.2 The company’s principal sources of liquidity are cash on hand, cash from operations and its Amended and Restated ABL Credit Facility, discussed below. The company and certain international subsidiaries have access to uncommitted lines of credit from various banks. At December 31, 2020, the company has met all covenants and conditions under its various lending agreements. The company expects to continue to meet these covenants and conditions through at least the next twelve months. Maturities of long-term debt, including finance leases, in each of the next five years and thereafter are as follows: Year Total Long-Term Debt Finance Leases 2021 $ 102.8 $ 100.4 $ 2.4 2022 18.2 16.2 2.0 2023 16.5 15.8 0.7 2024 9.8 9.4 0.4 2025 2.8 2.8 — Thereafter 479.8 479.8 — Total $ 629.9 $ 624.4 $ 5.5 Cash paid for interest and capitalized interest expense was as follows: Year ended December 31, 2020 2019 2018 Cash paid for interest $ 32.9 $ 61.5 $ 59.5 Capitalized interest expense $ 4.6 $ 6.6 $ 6.0 Senior Secured Notes due 2027 On October 29, 2020, the company issued $485.0 million aggregate principal amount of its 6.875% Senior Secured Notes due 2027 (the 2027 Notes). The 2027 Notes will pay interest semiannually on May 1 and November 1, commencing on May 1, 2021, and will mature on November 1, 2027, unless earlier repurchased or redeemed. The 2027 Notes are fully and unconditionally guaranteed on a senior secured basis by Unisys Holding Corporation, Unisys NPL, Inc., and Unisys AP Investment Company I, each a Delaware corporation that is directly or indirectly owned by the company (the subsidiary guarantors). The 2027 Notes and the related guarantees rank equally in right of payment with all of the existing and future senior debt of the company and its subsidiary guarantors and senior in right of payment to any future subordinated debt of the company and its subsidiary guarantors. The 2027 Notes and the related guarantees are structurally subordinated to all existing and future liabilities (including preferred stock, trade payables and pension liabilities) of the subsidiaries of the company that are not subsidiary guarantors. The 2027 Notes and the guarantees will be secured by liens on substantially all assets of the company and the subsidiary guarantors, other than certain excluded assets (the collateral). The liens securing the 2027 Notes on certain ABL collateral will be subordinated to the liens on ABL collateral in favor of the ABL secured parties and, in the future, the liens securing the 2027 Notes may be subordinated to liens on the collateral securing certain permitted first lien debt, subject to certain limitations and permitted liens. The company may, at its option, redeem some or all of the 2027 Notes at any time on or after November 1, 2020 at a redemption price determined in accordance with the redemption schedule set forth in the indenture, plus accrued and unpaid interest, if any. Prior to November 1, 2023 the company may, at its option, redeem some or all of the 2027 Notes at any time, at a price equal to 100% of the principal amount of the 2027 Notes redeemed plus a “make-whole” premium, plus accrued and unpaid interest, if any. The company may also redeem, at its option, up to 40% of the 2027 Notes at any time prior to November 1, 2023, using the proceeds of certain equity offerings at a redemption price of 106.875% of the principal amount thereof, plus accrued and unpaid interest, if any. On or after November 1, 2023, the company may, on any one or more occasions, redeem all or a part of the 2027 Notes at specified redemption premiums, declining to par for any redemptions on or after November 1, 2025. 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. If the company experiences certain kinds of changes of control (as defined in the indenture), it will be required to offer to repurchase the 2027 Notes at 101% of the principal amount of the 2027 Notes, plus accrued and unpaid interest as of the repurchase date, if any. In addition, if the company sells assets under certain circumstances it must apply the proceeds towards an offer to repurchase the 2027 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 occur, would permit or require the principal, premium, if any, interest and any other monetary obligations on all the then outstanding 2027 Notes to be due and payable immediately. Interest expense related to the 2027 Notes is comprised of the following: Year ended December 31, 2020 Contractual interest coupon $ 5.7 Amortization of issuance costs 0.2 Total $ 5.9 Senior Secured Notes due 2022 On April 15, 2020, the company redeemed all $440.0 million in aggregate principal amount of its outstanding 10.750% Senior Secured Notes due 2022 (the 2022 Notes) for a redemption price equal to 105.375% of the aggregate principal amount of the 2022 Notes redeemed plus accrued but unpaid interest to, but not including, the redemption date. The redemption price paid was $487.3 million and is made up of the following: $440.0 million of principal amount due, $23.65 million of call premium and $23.65 million of accrued interest through April 14, 2020. The company recorded a loss on debt extinguishment in other expense, net of $28.5 million consisting of the premium of $23.65 million and write off of $4.8 million of unamortized discount and fees related to the issuance of the 2022 Notes. Interest expense related to the 2022 Notes is comprised of the following: Year ended December 31, 2020 2019 2018 Contractual interest coupon $ 13.8 $ 47.3 $ 47.3 Amortization of issuance costs 0.7 2.4 2.4 Total $ 14.5 $ 49.7 $ 49.7 Convertible Senior Notes 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. The 2021 Notes are not redeemable by the company prior to maturity. The 2021 Notes are convertible by the holders into shares of the company’s common stock if certain conditions set forth in the indenture governing the 2021 Notes have been satisfied. 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 at issuance date 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. On November 25, 2020, the company gave notice to the holders of its 2021 Notes that it had elected to satisfy its conversion obligation in respect of such conversion by the combination settlement method, whereby the company shall pay and deliver to the converting holders in respect of each $1,000 principal amount of the 2021 Notes being converted a settlement amount equal to the sum of $1,000 plus shares of the company’s common stock. Assuming that all of the holders of the 2021 Notes convert their 2021 Notes into shares of the company’s common stock, in March of 2021, the company will deliver to the note holders $84.2 million of cash and approximately 4.6 million shares of the company’s common stock. The company estimates that it will receive approximately 1.2 million shares upon exercise of the capped call transactions; therefore, the number of outstanding shares of common stock will increase by approximately 3.4 million shares. 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. In 2019, the company entered into separate, privately negotiated exchange agreements pursuant to which it (i) issued an aggregate of 10,593,930 shares of its common stock, and (ii) paid cash in an aggregate amount of $59.4 million, such cash amount included $3.1 million of accrued and unpaid interest on the exchanged 2021 Notes up to, but excluding, the settlement date, in exchange for $129.3 million in aggregate principal amount of its outstanding 2021 Notes. Upon closing, $84.2 million aggregate principal amount of 2021 Notes remained outstanding. In connection with the transactions, the company unwound a pro rata portion of the capped call transactions described above and received proceeds of $7.2 million. Following the 2021 Notes exchange, the capped call transactions remaining cover approximately 8.6 million shares of the company’s common stock. As a result of the exchange, the company recognized a charge of $20.1 million in other expense, net in 2019. Interest expense related to the 2021 Notes is comprised of the following: Year ended December 31, 2020 2019 2018 Contractual interest coupon $ 4.6 $ 8.9 $ 11.8 Amortization of debt discount 3.1 5.5 6.6 Amortization of debt issuance costs 0.5 0.9 1.2 Total $ 8.2 $ 15.3 $ 19.6 Other Debt In 2019, the company entered into a $27.7 million Installment Payment Agreement (IPA) maturing on December 20, 2023 with a syndicate of financial institutions to finance the acquisition of certain software licenses necessary for the provision of services to a client. Interest accrues at an annual rate of 7.0% and the company is required to make monthly principal and interest payments on each agreement in arrears. At December 31, 2020, $6.5 million was reported in current maturities of long-term debt. In 2019, the company entered into a vendor agreement in the amount of $19.3 million to finance the acquisition of certain software licenses used to provide services to our clients and for its own internal use. Interest accrues at an annual rate of 5.47% and the company is required to make annual principal and interest payments in advance with the last payment due on March 1, 2024. At December 31, 2020, $3.6 million was reported in current maturities of long-term debt. ABL Credit Facility Contemporaneously with the issuance of the 2027 Notes, the company and the subsidiary guarantors entered into an amendment and restatement of the company’s secured revolving credit facility (the Amended and Restated ABL Credit Facility) that provides for revolving loans and letters of credit up to an aggregate amount of $145.0 million (with a limit on letters of credit of $40.0 million), with an accordion feature provision allowing for an increase in credit facility up to $175.0 million upon the satisfaction of certain conditions specified in the Amended and Restated ABL Credit Facility . The amendment and restatement extended the maturity from October 2022 to October 29, 2025 and modified certain other terms and covenants. Availability under the credit facility is subject to a borrowing base calculated by reference to the company’s receivables. At December 31, 2020, the company had no borrowings and $5.7 million of letters of credit outstanding, and availability under the facility was $112.9 million net of letters of credit issued. The Amended and Restated ABL Credit Facility is subject to a springing maturity, under which the Amended and Restated ABL Credit Facility will immediately mature 91 days prior to any date on which contributions to pension funds in the United States in an amount in excess of $100.0 million are required to be paid unless the company is able to meet certain conditions, including that the company has the liquidity (as defined in the Amended and Restarted ABL Credit Facility) to cash settle the amount of such pension payments, no default or event of default has occurred under the Amended and Restated ABL Credit Facility, the company’s liquidity is above $130.0 million and the company is in compliance with the then applicable fixed charge coverage ratio on a pro forma basis. The Amended and Restated ABL Credit Facility is guaranteed by the subsidiary guarantors 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 Amended and Restated ABL Credit Facility falls below the greater of 10% of the lenders’ commitments under the facility and $14.5 million. The Amended and Restated ABL Credit Facility contains customary representations and warranties, including, but not limited to, that there has been no material adverse change in the company’s business, properties, operations or financial condition. The Amended and Restated ABL Credit Facility includes restrictions 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. These restrictions are subject to several important limitations and exceptions. 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, subject to relevant cure periods, as applicable.

Other accrued liabilities

Other accrued liabilities	12 Months Ended
	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Other accrued liabilities	Other accrued liabilities Other accrued liabilities (current) are comprised of the following: As of December 31, 2020 2019 Payrolls and commissions $ 95.9 $ 106.8 Income taxes 41.2 28.6 Cost reduction 40.7 47.5 Operating leases 37.1 34.1 Taxes other than income taxes 33.0 18.3 Accrued vacations 24.3 24.7 Postretirement 11.7 13.6 Accrued interest 8.0 11.8 Other 60.1 31.3 Total other accrued liabilities $ 352.0 $ 316.7

Employee plans

Employee plans	12 Months Ended
	Dec. 31, 2020
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, 2020, 8.1 million shares of unissued common stock of the company were available for granting under these plans. As of December 31, 2020, 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. During the years ended December 31, 2020, 2019 and 2018, the company recognized $14.5 million, $13.2 million and $13.2 million of share-based compensation expense, which is comprised of $14.5 million, $13.2 million and $13.1 million of restricted stock unit expense and zero, zero and $0.1 million of stock option expense, respectively. There were no grants of stock option awards for the years ended December 31, 2020, 2019 and 2018. As of December 31, 2020, 0.3 million stock option awards with a weighted-average exercise price of $22.02 are outstanding. Restricted stock unit awards may contain time-based units, performance-based units, total shareholder return market-based units, or a combination of these units. Each performance-based and market-based unit will vest into zero to two shares depending on the degree to which the performance or market conditions are met. Compensation expense for performance-based 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. Compensation expense for market-based awards is recognized as expense ratably over the measurement period, regardless of the actual level of achievement, provided the service requirement is met. Time-based restricted stock unit grants for the company’s directors vest upon award and compensation expense for such awards is recognized upon grant. A summary of restricted stock unit activity for the year ended December 31, 2020 follows (shares in thousands): Restricted Stock Units Weighted-Average Grant-Date Fair Value Outstanding at December 31, 2019 2,040 $ 14.17 Granted 752 22.48 Vested (940) 13.80 Forfeited and expired (126) 16.10 Outstanding at December 31, 2020 1,726 17.87 The aggregate weighted-average grant-date fair value of restricted stock units granted during the years ended December 31, 2020, 2019 and 2018 was $17.4 million, $16.9 million and $17.9 million, respectively. The fair value of restricted stock units with time and performance conditions is determined based on the trading price of the company’s common shares on the date of grant. The fair value of awards with market conditions is estimated using a Monte Carlo simulation with the following weighted-average assumptions. Year ended December 31, 2020 2019 Weighted-average fair value of grant $ 28.33 $ 16.58 Risk-free interest rate (i) 1.35 % 2.49 % Expected volatility (ii) 51.81 % 47.91 % Expected life of restricted stock units in years (iii) 2.86 2.87 Expected dividend yield — % — % (i) Represents the continuously compounded semi-annual zero-coupon U.S. treasury rate commensurate with the remaining performance period (ii) Based on historical volatility for the company that is commensurate with the length of the performance period (iii) Represents the remaining life of the longest performance period As of December 31, 2020, there was $12.6 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, 2020, 2019 and 2018 was $13.0 million, $14.9 million and $10.4 million, respectively. Common stock issued upon exercise of stock options or upon lapse of restrictions on restricted stock units are newly issued shares. During 2020 and 2019, 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, 2020, 2019 and 2018, was $8.8 million, $8.2 million and $7.0 million, respectively. The company has defined contribution plans in certain locations outside the United States. The charge to income related to these plans was $16.2 million, $19.3 million and $21.3 million, for the years ended December 31, 2020, 2019 and 2018, 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, 2020 and 2019, the liability to the participants of these plans was $12.7 million and $14.7 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. Management develops the actuarial assumptions used by its U.S. and international defined benefit pension plan obligations based upon the circumstances of each particular plan. The determination of the defined benefit pension plan obligations requires the use of estimates. In December 2020, the company completed a lump-sum cash-out offer for eligible former associates who had deferred vested benefit under the company’s U.S. defined benefit pension plans 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 3,500 former associates of $276.0 million and the company recorded a non-cash pre-tax settlement charge of $142.1 million. Retirement plans’ funded status and amounts recognized in the company’s consolidated balance sheets follows: U.S. Plans International Plans As of December 31, 2020 2019 2020 2019 Change in projected benefit obligation Benefit obligation at beginning of year $ 4,755.6 $ 4,558.0 $ 3,143.8 $ 2,829.5 Service cost — — 2.8 2.8 Interest cost 162.5 197.5 53.4 68.3 Plan participants’ contributions — — 1.1 1.3 Plan curtailment — — (1.6) (1.6) Plan settlement (277.3) — — (3.5) Actuarial loss 253.9 357.7 226.5 284.1 Benefits paid (349.4) (357.6) (119.0) (118.1) Foreign currency translation adjustments — — 161.0 81.0 Benefit obligation at end of year $ 4,545.3 $ 4,755.6 $ 3,468.0 $ 3,143.8 Change in plan assets Fair value of plan assets at beginning of year $ 3,334.2 $ 3,112.8 $ 2,816.4 $ 2,539.4 Actual return on plan assets 347.2 505.2 254.7 300.0 Employer contribution 793.1 73.8 33.1 30.1 Plan participants’ contributions — — 1.1 1.3 Plan settlement (277.3) — — (3.5) Benefits paid (349.4) (357.6) (119.0) (118.1) Foreign currency translation adjustments — — 143.1 67.2 Fair value of plan assets at end of year $ 3,847.8 $ 3,334.2 $ 3,129.4 $ 2,816.4 Funded status at end of year $ (697.5) $ (1,421.4) $ (338.6) $ (327.4) Amounts recognized in the consolidated balance sheets consist of: Prepaid postretirement assets $ 27.2 $ — $ 160.3 $ 135.9 Other accrued liabilities (6.1) (6.8) (0.2) (0.2) Long-term postretirement liabilities (718.6) (1,414.6) (498.7) (463.1) Total funded status $ (697.5) $ (1,421.4) $ (338.6) $ (327.4) Accumulated other comprehensive loss, net of tax Net loss $ 2,510.4 $ 2,672.7 $ 1,116.9 $ 1,067.2 Prior service credit $ (32.3) $ (34.8) $ (45.9) $ (46.4) Accumulated benefit obligation $ 4,545.3 $ 4,755.6 $ 3,360.4 $ 3,035.3 Information for defined benefit retirement plans with an accumulated benefit obligation in excess of plan assets follows: As of December 31, 2020 2019 Accumulated benefit obligation $ 6,060.7 $ 6,896.5 Fair value of plan assets $ 4,839.5 $ 5,014.1 Information for defined benefit retirement plans with a projected benefit obligation in excess of plan assets follows: As of December 31, 2020 2019 Projected benefit obligation $ 6,063.0 $ 6,898.7 Fair value of plan assets $ 4,839.5 $ 5,014.1 Net periodic pension cost (income) includes the following components: U.S. Plans International Plans Year ended December 31, 2020 2019 2018 2020 2019 2018 Service cost (i) $ — $ — $ — $ 2.8 $ 2.8 $ 3.2 Interest cost 162.5 197.5 186.6 53.4 68.3 67.3 Expected return on plan assets (208.6) (218.2) (230.6) (90.6) (104.6) (114.4) Amortization of prior service credit (2.5) (2.5) (2.5) (2.5) (2.5) (3.7) Recognized net actuarial loss 135.5 116.6 125.1 43.2 34.2 42.3 Curtailment gain — — — — (0.1) — Settlement loss 142.1 — — — 1.2 6.4 Net periodic pension cost (income) $ 229.0 $ 93.4 $ 78.6 $ 6.3 $ (0.7) $ 1.1 (i) Service cost is reported in cost of revenue - services and selling, general and administrative expenses. All other components of net periodic pension cost are reported in other expense, net in the consolidated statements of income. Management’s significant assumption used in the determination of the defined benefit pension plan obligations, and settlement losses associated with respect to the U.S. pension plans, is the discount rate. Weighted-average assumptions used to determine net periodic pension cost were as follows: U.S. Plans International Plans Year ended December 31, 2020 2019 2018 2020 2019 2018 Discount rate 3.53 % 4.50 % 3.87 % 1.82 % 2.55 % 2.24 % Expected long-term rate of return on assets 6.50 % 6.80 % 6.80 % 3.50 % 4.18 % 4.38 % Weighted-average assumptions used to determine benefit obligations at December 31 were as follows: Discount rate 2.85 % 3.53 % 4.50 % 1.23 % 1.82 % 2.55 % 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 32 % 26-38% 19 % 16-23% Debt securities 53 % 49-57% 61 % 54-67% Real estate 0 % 0 % 1 % 0-3% Cash 0 % 0-5% 1 % 0-5% Other 15 % 5-25% 18 % 11-26% 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 in equity securities in the U.S. and for international plans by investing in appropriate asset classes, subject to the constraints of each plan’s asset allocation targets, as discussed above, 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. plans 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 2021, the company expects to make cash contributions of $250.6 million to its worldwide defined benefit pension plans, which are comprised of a voluntary contribution of $200.0 million for the company’s U.S. qualified defined benefit pension plans and $50.6 million primarily for international defined benefit pension plans. As of December 31, 2020, the following benefit payments are expected to be paid from the defined benefit pension plans: Year ending December 31, U.S. International 2021 $ 352.8 $ 114.8 2022 346.5 117.7 2023 339.6 121.1 2024 331.9 125.0 2025 323.0 126.9 2026 - 2030 1,453.2 677.3 Other postretirement benefits A reconciliation of the benefit obligation, fair value of the plan assets and the funded status of the postretirement benefit plans follows: As of December 31, 2020 2019 Change in accumulated benefit obligation Benefit obligation at beginning of year $ 95.7 $ 96.2 Service cost 0.5 0.5 Interest cost 4.4 4.8 Plan participants’ contributions 2.3 2.7 Actuarial loss (gain) (13.8) 1.0 Benefits paid (8.8) (8.9) Foreign currency translation and other adjustments (0.1) (0.6) Benefit obligation at end of year $ 80.2 $ 95.7 Change in plan assets Fair value of plan assets at beginning of year $ 6.9 $ 7.8 Actual return on plan assets (0.4) (0.2) Employer contributions 6.0 5.5 Plan participants’ contributions 2.3 2.7 Benefits paid (8.8) (8.9) Fair value of plan assets at end of year $ 6.0 $ 6.9 Funded status at end of year $ (74.2) $ (88.8) Amounts recognized in the consolidated balance sheets consist of: Prepaid postretirement assets $ — $ 0.3 Other accrued liabilities (5.4) (6.6) Long-term postretirement liabilities (68.8) (82.5) Total funded status $ (74.2) $ (88.8) Accumulated other comprehensive loss, net of tax Net loss $ (3.0) $ 11.1 Prior service credit (4.9) (6.6) Net periodic postretirement benefit cost follows: Year ended December 31, 2020 2019 2018 Service cost (i) $ 0.5 $ 0.5 $ 0.6 Interest cost 4.4 4.8 4.8 Expected return on assets (0.4) (0.4) (0.4) Amortization of prior service cost (1.6) (1.7) (1.6) Recognized net actuarial loss 1.0 0.7 1.0 Net periodic benefit cost $ 3.9 $ 3.9 $ 4.4 (i) Service cost is reported in selling, general and administrative expenses. All other components of net periodic benefit cost are reported in other expense, net in the consolidated statements of income. Weighted-average assumptions used to determine net periodic postretirement benefit cost were as follows: Year ended December 31, 2020 2019 2018 Discount rate 5.13 % 5.67 % 5.30 % 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, 2020 2019 2018 Discount rate 2.21 % 5.13 % 5.67 % 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 2021, the company expects to contribute approximately $5 million to its postretirement benefit plans. Assumed health care cost trend rates at December 31, 2020 2019 Health care cost trend rate assumed for next year 5.4 % 5.8 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.5 % 4.5 % Year that the rate reaches the ultimate trend rate 2025 2025 As of December 31, 2020, the following benefits are expected to be paid from the company’s postretirement plans: Year ending December 31, Expected 2021 $ 6.3 2022 6.0 2023 5.6 2024 5.3 2025 4.9 2026 – 2030 19.9 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, receivables and cumulative futures contracts variation margin received from brokers 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 120 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, 2020. U.S. Plans International Plans As of December 31, 2020 Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Pension plans Equity Securities Common Stocks $ 774.1 $ 771.2 $ 2.9 $ — $ — $ — $ — $ — Commingled Funds 640.6 640.6 153.4 153.4 Debt Securities U.S. Govt. Securities 388.5 388.5 Other Fixed Income 589.9 589.9 125.8 125.8 Insurance Contracts 127.5 127.5 Commingled Funds 689.9 689.9 471.2 471.2 Real Estate Real Estate Investment Trusts 112.1 112.1 2.0 2.0 Other Derivatives (i) (67.3) 5.0 (72.3) 20.5 20.5 Commingled Funds 381.4 381.4 Pooled Funds 233.4 233.4 178.0 178.0 Cumulative futures contracts variation margin paid to brokers (1.1) (1.1) Cash 21.8 21.8 111.7 111.7 Receivables 28.8 28.8 2.1 2.1 Payables (7.3) (7.3) (20.7) (20.7) Total plan assets in fair value hierarchy $ 3,403.4 $ 1,319.0 $ 2,084.4 $ — $ 1,552.9 $ 93.1 $ 1,332.3 $ 127.5 Plan assets measured using NAV as a practical expedient (ii): Commingled Funds Equity $ — $ 429.9 Debt 121.7 1,067.4 Other 104.2 27.4 Private Real Estate 208.0 51.8 Private Equity 10.5 — Total pension plan assets $ 3,847.8 $ 3,129.4 Other postretirement plans Insurance Contracts $ 6.0 $ 6.0 (i) Level 1 derivatives represent unrealized appreciation or depreciation on open futures contracts. The value of open futures contracts includes derivatives and the cumulative futures contracts variation margin paid to or received from brokers. (ii) 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, 2019. U.S. Plans International Plans As of December 31, 2019 Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Pension plans Equity Securities Common Stocks $ 955.3 $ 952.8 $ 2.5 $— $ — $ — $ — $ — Commingled Funds 578.8 578.8 176.7 176.7 Debt Securities U.S. Govt. Securities 436.0 436.0 Other Fixed Income 278.1 278.1 91.0 — 91.0 Insurance Contracts 123.1 123.1 Commingled Funds 433.6 433.6 441.0 441.0 Real Estate Real Estate Investment Trusts 14.0 14.0 1.0 1.0 Commingled Funds 186.5 186.5 Other Derivatives (i) (103.5) (8.2) (95.3) 6.5 6.5 Commingled Funds 372.8 372.8 Pooled Funds 135.5 135.5 189.2 189.2 Cumulative futures contracts variation margin received from brokers 8.2 8.2 Cash 2.0 2.0 18.1 18.1 Receivables 14.4 14.4 0.2 0.2 Payables (7.4) (7.4) (7.3) (7.3) Total plan assets in fair value hierarchy $ 2,931.5 $ 1,411.8 $ 1,519.7 $ — $ 1,412.3 $ 11.0 $ 1,278.2 $ 123.1 Plan assets measured using NAV as a practical expedient (ii): Commingled Funds Equity $ — $ 406.9 Debt 86.3 941.0 Other 127.0 24.8 Private Real Estate 189.0 31.4 Private Equity 0.4 — Total pension plan assets $ 3,334.2 $ 2,816.4 Other postretirement plans Insurance Contracts $ 6.9 $ 6.9 (i) Level 1 derivatives represent unrealized appreciation or depreciation on open futures contracts. The value of open futures contracts includes derivatives and the cumulative futures contracts variation margin received from brokers. (ii) 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, 2020. January 1, Realized Purchases Sales Currency and unrealized gains (losses) relating to instruments still held at December 31, 2020 December 31, U.S. plans Other postretirement plans Insurance Contracts $ 6.9 $ (0.4) $ — $ (0.5) $ — $ 6.0 International pension plans Insurance Contracts $ 123.1 $ — $ 4.1 $ (11.5) $ 11.8 $ 127.5 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, 2019. January 1, Realized Purchases Sales Currency and unrealized gains (losses) relating to instruments still held at December 31, 2019 December 31, U.S. plans Other postretirement plans Insurance Contracts $ 7.8 $ (0.3) $ — $ (0.6) $ — $ 6.9 International pension plans Insurance Contracts $ 123.7 $ — $ 6.4 $ (12.0) $ 5.0 $ 123.1 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. 2020 2019 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 $ 121.7 $ — Monthly 45 days $ 86.3 $ — Monthly 45 days Other 104.2 — Monthly 5 days 127.0 — Monthly 5 days Private Real Estate (i) 208.0 15.7 Quarterly 60-90 days 189.0 44.4 Quarterly 60-90 days Private Equity (ii) 10.5 20.9 0.4 — Total $ 444.4 $ 36.6 $ 402.7 $ 44.4 International pension plans Commingled Funds Equity $ 429.9 $ — Weekly Up to 2 days $ 406.9 $ — Weekly Up to 2 days Debt 1,067.4 86.2 Weekly, Bimonthly, Monthly, Quarterly Up to 120 days 941.0 117.9 Daily, Weekly, Biweekly, Bimonthly, Monthly, Quarterly Up to 120 days Other 27.4 — Monthly Up to 30 days 24.8 — Monthly Up to 30 days Private Real Estate 51.8 — Monthly Up to 90 days 31.4 — Monthly Up to 90 days Total $ 1,576.5 $ 86.2 $ 1,404.1 $ 117.9 (i) Includes investments in private real estate funds. The funds invest in U.S. real estate and allow redemptions quarterly, though queues, restrictions and gates may extend the period. A redemption has been requested from one fund, which has a redemption queue with estimates of full receipt of three

Litigation and contingencies

Litigation and contingencies	12 Months Ended
	Dec. 31, 2020
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 flow could be materially affected in any particular period by the resolution of one or more of the legal matters pending against it. 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, 2020, 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 $81 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 it has incurred damages of approximately $48 million for the period July 1, 1989 through September 4, 2012, plus interest. On November 23, 2020, the parties reached a settlement in the amount of $10.6 million. 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, 2020, it has adequate provisions for any such matters.

Stockholders' equity

Stockholders' equity	12 Months Ended
	Dec. 31, 2020
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, 2020, 18.7 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) attributable to Unisys Corporation is as follows: Total Translation Postretirement Balance at December 31, 2017 $ (3,815.8) $ (817.0) $ (2,998.8) Reclassification pursuant to ASU No. 2018-02 (208.7) — (208.7) Other comprehensive income before reclassifications 96.7 (79.7) 176.4 Amounts reclassified from accumulated other comprehensive income (157.0) — (157.0) Current period other comprehensive income (269.0) (79.7) (189.3) Balance at December 31, 2018 (4,084.8) (896.7) (3,188.1) Other comprehensive income before reclassifications 136.8 23.8 113.0 Amounts reclassified from accumulated other comprehensive income (140.6) — (140.6) Current period other comprehensive income (3.8) 23.8 (27.6) Balance at December 31, 2019 (4,088.6) (872.9) (3,215.7) Other comprehensive income before reclassifications 489.4 78.6 410.8 Amounts reclassified from accumulated other comprehensive income (340.3) (32.3) (308.0) Current period other comprehensive income 149.1 46.3 102.8 Balance at December 31, 2020 $ (3,939.5) $ (826.6) $ (3,112.9) Amounts reclassified out of accumulated other comprehensive loss are as follows: Year ended December 31, 2020 2019 2018 Translation Adjustments: Adjustment for substantial completion of liquidation of foreign subsidiaries (i) $ (32.3) $ — $ — Postretirement Plans: Amortization of prior service cost (ii) 5.9 5.9 7.1 Amortization of actuarial losses (ii) (177.3) (149.7) (165.9) Settlement loss (ii) (142.1) (1.1) (3.9) Total before tax (345.8) (144.9) (162.7) Income tax benefit 5.5 4.3 5.7 Total reclassifications for the period $ (340.3) $ (140.6) $ (157.0) (i) Reported in other expense, net in the consolidated statements of income (ii) Included in net periodic postretirement cost (see Note 17) The following table summarizes the changes in shares of common stock and treasury stock: Common Treasury Balance at December 31, 2017 53.4 2.9 Stock-based compensation 0.8 0.2 Balance at December 31, 2018 54.2 3.1 Debt exchange 10.6 — Stock-based compensation 1.1 0.4 Balance at December 31, 2019 65.9 3.5 Stock-based compensation 0.9 0.3 Balance at December 31, 2020 66.8 3.8

Segment information

Segment information	12 Months Ended
	Dec. 31, 2020
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) solutions. 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 operating environments and related applications for high-intensity enterprise computing, including the procurement of hardware and other related products to help clients improve security and flexibility, reduce costs 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, 2020, 2019 and 2018 was $7.8 million, $5.7 million and $4.2 million, respectively. The profit on these transactions is eliminated in Corporate. The company evaluates business segment performance based on operating income exclusive of postretirement 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. 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, 2020 2019 2018 Services Cloud & infrastructure services $ 1,178.1 $ 1,287.2 $ 1,225.4 Application services 350.2 370.9 381.7 BPO solutions 164.6 234.6 250.5 Total Services 1,692.9 1,892.7 1,857.6 Technology 333.4 330.1 393.6 Total customer revenue $ 2,026.3 $ 2,222.8 $ 2,251.2 Presented below is a reconciliation of segment operating income to consolidated income (loss) from continuing operations before income taxes: Year ended December 31, 2020 2019 2018 Total segment operating income $ 154.8 $ 180.1 $ 233.4 Interest expense (29.2) (62.1) (64.0) Other (expense), net (329.6) (136.4) (77.1) Cost reduction charges (i) (63.2) (28.7) (19.7) Corporate and eliminations (4.6) (13.5) (1.6) Total income (loss) from continuing operations before income taxes $ (271.8) $ (60.6) $ 71.0 (i) Year ended December 31, 2020 excludes $32.3 million for net foreign currency losses related to exiting foreign countries which are reported in other 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, 2020 2019 2018 Total segment assets $ 1,302.3 $ 1,263.4 $ 1,254.7 Cash and cash equivalents 898.5 538.8 605.0 Deferred income taxes 136.2 114.0 109.3 Operating lease right-of-use assets 79.3 71.4 — Prepaid postretirement assets 187.5 136.2 147.6 Assets of discontinued operations — 243.2 181.9 Other corporate assets 104.1 137.0 159.1 Total assets $ 2,707.9 $ 2,504.0 $ 2,457.6 A summary of the company’s operations by business segment is presented below: Total Corporate Services Technology 2020 Customer revenue $ 2,026.3 $ — $ 1,692.9 $ 333.4 Intersegment — (16.3) — 16.3 Total revenue $ 2,026.3 $ (16.3) $ 1,692.9 $ 349.7 Operating income (loss) $ 87.0 $ (67.8) $ 12.2 $ 142.6 Depreciation and amortization 161.0 — 70.9 90.1 Total assets 2,707.9 1,405.6 850.5 451.8 Capital expenditures 130.1 2.5 49.2 78.4 2019 Customer revenue $ 2,222.8 $ — $ 1,892.7 $ 330.1 Intersegment — (15.2) — 15.2 Total revenue $ 2,222.8 $ (15.2) $ 1,892.7 $ 345.3 Operating income (loss) $ 137.9 $ (42.2) $ 20.8 $ 159.3 Depreciation and amortization 147.4 — 91.9 55.5 Total assets 2,504.0 1,240.6 864.2 399.2 Capital expenditures 159.8 7.1 74.0 78.7 2018 Customer revenue $ 2,251.2 $ — $ 1,857.6 $ 393.6 Intersegment — (24.7) — 24.7 Total revenue $ 2,251.2 $ (24.7) $ 1,857.6 $ 418.3 Operating income (loss) $ 212.1 $ (21.3) $ 9.1 $ 224.3 Depreciation and amortization 164.1 — 97.2 66.9 Total assets 2,457.6 1,202.9 846.9 407.8 Capital expenditures 189.3 8.0 92.9 88.4 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, 2020 2019 2018 Revenue United States $ 781.5 $ 824.0 $ 666.2 United Kingdom 228.0 334.3 360.7 Other foreign 1,016.8 1,064.5 1,224.3 Total Revenue $ 2,026.3 $ 2,222.8 $ 2,251.2 Properties, net United States $ 82.0 $ 82.3 $ 75.9 United Kingdom 9.2 10.5 5.3 Other foreign 19.3 23.2 30.7 Total Properties, net $ 110.5 $ 116.0 $ 111.9 Outsourcing assets, net United States $ 93.1 $ 99.5 $ 97.6 United Kingdom 55.3 71.7 86.5 Australia 19.3 21.5 21.7 Other foreign 6.2 9.4 10.6 Total Outsourcing assets, net $ 173.9 $ 202.1 $ 216.4

Remaining performance obligatio

Remaining performance obligations	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Remaining performance obligations	Contract assets and deferred revenue Contract assets represent rights to consideration in exchange for goods or services transferred to a customer when that right is conditional on something other than the passage of time. Deferred revenue represents contract liabilities. Net contract assets (liabilities) are as follows: As of December 31, 2020 2019 Contract assets - current $ 44.3 $ 38.4 Contract assets - long-term (i) 20.7 21.6 Deferred revenue - current (257.1) (246.4) Deferred revenue - long-term (137.9) (147.0) (i) Reported in other long-term assets on the company’s consolidated balance sheets Significant changes in the above contract asset and liability balances were as follows: Year ended December 31, 2020 2019 Revenue recognized that was included in deferred revenue at the beginning of the period $ 236.1 $ 270.1 The company’s incremental direct costs of obtaining a contract consist of sales commissions which are deferred and amortized ratably over the initial contract life. These costs are classified as current or noncurrent based on the timing of when the company expects to recognize the expense. The current and noncurrent portions of deferred commissions are included in prepaid expenses and other current assets and in other long-term assets, respectively, in the company’s consolidated balance sheets. Deferred commissions were as follows: As of December 31, 2020 2019 Deferred commissions $ 8.7 $ 9.1 Amortization expense related to deferred commissions was as follows: Year ended December 31, 2020 2019 2018 Deferred commissions - amortization expense (i) $ 3.2 $ 3.1 $ 6.5 (i) Reported in selling, general and administrative expense in the company’s consolidated statements of income Costs on outsourcing contracts are generally expensed as incurred. However, certain costs incurred upon initiation of an outsourcing contract (costs to fulfill a contract), principally initial customer setup, are capitalized and expensed over the initial contract life. These costs are included in outsourcing assets, net in the company’s consolidated balance sheets, and are amortized over the initial contract life and reported in Services cost of sales. Costs to fulfill a contract were as follows: As of December 31, 2020 2019 Costs to fulfill a contract $ 74.4 $ 75.8 Amortization expense related to costs to fulfill a contract was as follows: Year ended December 31, 2020 2019 2018 Costs to fulfill a contract - amortization expense $ 27.5 $ 24.2 $ 21.7 The remaining balance of outsourcing assets, net is comprised of fixed assets and software used in connection with outsourcing contracts. These costs are capitalized and depreciated over the shorter of the initial contract life or in accordance with the company’s fixed asset policy.

Subsequent events

Subsequent events	12 Months Ended
	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent events	Subsequent events In January of 2021, the company signed an agreement with an insurance company to purchase a group annuity contract for $279 million to transfer projected benefit obligations related to approximately 11,600 retirees of the company’s U.S. defined benefit pension plans. This action is expected to result in a first quarter 2021 one-time, non-cash, pre-tax settlement charge of approximately $158 million. In January 2021, the company decided to make a number of changes to its organizational structure to more effectively address evolving client needs. With these changes, the company revised its reportable segments, but this did not impact the consolidated financial statements as of December 31, 2020. The company’s reportable segments will be as follows: Digital Workplace Services, which will provide services and IP-led solutions that support clients’ employees’ productivity, satisfaction and ability to securely work anywhere, any time; Cloud & Infrastructure, which will provide hybrid and multi-cloud solutions in select markets to accelerate innovation and increase efficiency of our clients’ businesses; ClearPath Forward ® , which will provide server systems and operating system software and services that are secure, innovative, and reliable for mission-critical processing; and Other, which is principally comprised of business processing outsourcing (BPO) solutions, which will provide management of critical processes and functions for clients in select industries, helping them improve performance and reduce costs. These changes will be reflected prospectively, with comparable prior period data, in the company’s first quarter 2021 Form 10-Q.

Quarterly financial information

Quarterly financial information (unaudited)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Quarterly financial information (unaudited)	Quarterly financial information (unaudited) First Second Third Fourth Year 2020 Revenue $ 515.4 $ 438.8 $ 495.2 $ 576.9 $ 2,026.3 Gross profit 113.1 74.9 119.9 175.1 483.0 Income (loss) from continuing operations before income taxes (41.9) (66.8) (7.2) (155.9) (271.8) Income (loss) from discontinued operations, net of tax 1,068.5 (2.1) 0.4 1.6 1,068.4 Net income (loss) attributable to Unisys Corporation 1,015.3 (78.6) (12.9) (173.1) 750.7 Earnings (loss) per common share attributable to Unisys Corporation Basic Continuing operations $ (0.85) $ (1.21) $ (0.21) $ (2.77) $ (5.05) Discontinued operations 17.06 (0.04) 0.01 0.02 16.98 Total $ 16.21 $ (1.25) $ (0.20) $ (2.75) $ 11.93 Diluted Continuing operations $ (0.85) $ (1.21) $ (0.21) $ (2.77) $ (5.05) Discontinued operations 17.06 (0.04) 0.01 0.02 16.98 Total $ 16.21 $ (1.25) $ (0.20) $ (2.75) $ 11.93 2019 Revenue $ 554.5 $ 569.4 $ 552.1 $ 546.8 $ 2,222.8 Gross profit 125.1 152.6 140.0 116.3 534.0 Income (loss) from continuing operations before income taxes (20.7) 7.9 (15.0) (32.8) (60.6) Income from discontinued operations, net of tax 13.3 25.5 16.0 20.2 75.0 Net income (loss) attributable to Unisys Corporation (19.4) 26.2 (13.2) (10.8) (17.2) Earnings (loss) per common share attributable to Unisys Corporation Basic Continuing operations $ (0.64) $ 0.01 $ (0.50) $ (0.50) $ (1.65) Discontinued operations 0.26 0.50 0.27 0.33 1.34 Total $ (0.38) $ 0.51 $ (0.23) $ (0.17) $ (0.31) Diluted Continuing operations $ (0.64) $ 0.01 $ (0.50) $ (0.50) $ (1.65) Discontinued operations 0.26 0.49 0.27 0.33 1.34 Total $ (0.38) $ 0.50 $ (0.23) $ (0.17) $ (0.31) On March 13, 2020, the company completed the sale of its U.S. Federal business to Science Applications International Corporation for cash of $1.2 billion. The company’s financial statements have been retroactively reclassified to report the U.S. Federal business as discontinued operations. As a result, all items relating to the business within the consolidated statements of income (loss) have been reported as income from discontinued operations, net of tax, and all items relating to the business within the consolidated balance sheets have been reported as either assets or liabilities of discontinued operations. Depreciation, amortization, capital expenditures, and significant noncash operating and investing activities related to the U.S. Federal business were immaterial for all periods presented. In the fourth quarter of 2020, the company recorded a pension settlement charge of $142.1 million. See Note 17, “Employee Plans,” of the Notes to Consolidated Financial Statements. In the second quarter of 2020 and the third quarter of 2019, the company recorded a pretax charge on debt extinguishment of $28.5 million and $20.1 million, respectively. See Note 15, “Debt,” of the Notes to Consolidated Financial Statements. In the first, second, third and fourth quarters of 2020, the company recorded pretax cost-reduction and other charges of $27.5 million, $7.9 million, $13.2 million and $46.9 million, respectively. See Note 4, “Cost reduction actions,” of the Notes to Consolidated Financial Statements. In the first, second, third and fourth quarters of 2019, the company recorded pretax cost-reduction and other charges of $2.6 million, $2.6 million, $0.2 million and $23.3 million, respectively. See Note 4, “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, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Schedule II - Valuation and Qualifying Accounts	SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Millions) Description Balance at Additions Deductions (i) Balance at Allowance for credit losses (deducted from accounts receivable): Year Ended December 31, 2018 $ 22.0 $ (5.1) $ (3.2) $ 13.7 Year Ended December 31, 2019 $ 13.7 $ (1.6) $ (0.3) $ 11.8 Year Ended December 31, 2020 $ 11.8 $ (0.3) $ (2.3) $ 9.2 (i) Includes write-off of bad debts less recoveries, reclassifications from other current liabilities and foreign currency translation adjustments.

Summary of significant accoun_2

Summary of significant accounting policies (Policies)	12 Months Ended
	Dec. 31, 2020
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 generally accepted accounting principles in the United States of America (GAAP) 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 estimated credit losses, contract assets, operating lease right-of-use assets, outsourcing assets, marketable software, goodwill and other long-lived assets, legal contingencies, assumptions used in the calculation 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 materially 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 consist of cash on hand, short-term investments purchased with an original 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.
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.
Outsourcing assets	Outsourcing assets Costs of 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 these costs is subject to various business risks. Quarterly, the company compares the carrying value of these assets with the undiscounted future cash flows expected to be generated by them to determine if there is impairment. If impaired, these 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.
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. Effective January 1, 2019, the company changed the estimated revenue-producing lives of the company’s proprietary
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.
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. The company tests goodwill for impairment annually in the fourth quarter using data as of September 30 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. The company estimates 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, the company gives more weighting to the income approach. The higher weighting assigned to the income approach takes 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.
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. Management develops the actuarial assumptions used by its U.S. and international defined benefit pension plan obligations based upon the circumstances of each particular plan. The determination of the defined benefit pension plan obligations requires the use of estimates. 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.
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.
Revenue recognition and Shipping and handling	Revenue recognition Revenue is recognized at an amount that reflects the consideration to which the company expects to be entitled in exchange for transferring goods and services to a customer. The company determines revenue recognition using the following five steps: (1) identify the contract(s) with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when (or as) the company satisfies a performance obligation. Revenue excludes taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue producing transaction and collected by the company from a customer (e.g., sales, use and value-added taxes). Revenue includes payments for shipping and handling activities. At contract inception, the company assesses the goods and services promised in a contract with a customer and identifies as a performance obligation each promise to transfer to the customer either: (1) a good or service (or a bundle of goods or services) that is distinct or (2) a series of distinct goods or services that are substantially the same and that have the same pattern of transfer to the customer. The company recognizes revenue only when it satisfies a performance obligation by transferring a promised good or service to a customer. The company must apply its judgment to determine the timing of the satisfaction of performance obligations as well as the transaction price and the amounts allocated to performance obligations including estimating variable consideration, adjusting the consideration for the effects of the time value of money and assessing whether an estimate of variable consideration is constrained. Revenue from hardware sales is recognized upon the transfer of control to a customer, which is defined as an entity’s ability to direct the use of and obtain substantially all of the remaining benefits of an asset. Revenue from software licenses is recognized at the inception of either the initial license term or the inception of an extension or renewal to the license term. 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 over time as the company transfers control of goods or services. The company measures its progress toward satisfaction of its performance obligations using the cost-to-cost method, or when services have been performed, depending on the nature of the project. For contracts accounted for using the cost-to-cost method, 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. In services arrangements, the company typically satisfies the performance obligation and recognizes revenue over time, because the client simultaneously receives and consumes the benefits provided as the company performs the services. The company’s services are provided on a time-and-materials basis, as a fixed-price contract or as a fixed-price per measure of output contract. Revenue from time-and-material contracts is recognized on an output basis as labor hours are delivered and/or direct expenses are incurred. In outsourcing contracts, including managed services, application management, business process outsourcing and other cloud-based services arrangements, the arrangement generally consists of a single performance obligation comprised of services that are substantially the same and that have the same pattern of transfer. The company applies a measure of progress (typically time-based) to any fixed consideration and allocates variable consideration to the periods of service based on usage. As a result, revenue is generally recognized over the period the services are provided either on a straight-line basis or on a usage basis, depending on the terms of the arrangement (such as whether the company is standing ready to perform or whether the contract has usage-based metrics). This results in revenue recognition that corresponds with the value to the client of the services transferred to date relative to the remaining services promised. The company also enters into arrangements, which may include any combination of hardware, software 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 performance obligations, with control over hardware and software transferred in one reporting period and the software support and hardware maintenance services performed 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 hardware and license software products to the client. The services are provided on a continuous basis across multiple reporting periods and control over the hardware and software products occurs in one reporting period. To the extent that a performance obligation in an arrangement is subject to specific guidance, that performance obligation is accounted for in accordance with such specific guidance. An example of such an arrangement may include leased assets which are subject to specific leasing accounting guidance. The company allocates the total transaction price to be earned under an arrangement among the various performance obligations in proportion to their standalone selling prices (relative standalone selling price basis). The standalone selling price for a performance obligation is the price at which the company would sell a promised good or service separately to a customer. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. Many of the company’s contracts have a single performance obligation as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and, therefore, not distinct. For contracts with multiple performance obligations, the company allocates the contract’s transaction price to each performance obligation using its best estimate of the standalone selling price of each distinct good or service in the contract. The primary methods used to estimate standalone selling price are as follows: (1) the expected cost plus margin approach, under which the company forecasts its expected costs of satisfying a performance obligation and then adds an appropriate margin for that distinct good or service and (2) the percent discount off of list price approach. In the Services segment, substantially all of the company’s performance obligations are satisfied over time as work progresses and therefore substantially all of the revenue in this segment is recognized over time. The company generally receives payment for these contracts over time as the performance obligations are satisfied. In the Technology segment, substantially all of the company’s goods and services are transferred to customers at a single point in time. Revenue on these contracts is recognized when control over the product is transferred to the customer or a software license term begins. The company generally receives payment for these contracts upon signature or within 30 to 60 days. The company discloses disaggregation of its customer revenue by geographic areas and by classes of similar products and services, by segment (see Note 20). The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables, contract assets and deferred revenue (contract liabilities). Shipping and handling Costs related to shipping and handling are included in cost of revenue.
Advertising costs	Advertising costs All advertising costs are expensed as incurred.
Stock-based compensation plans	Stock-based compensation plans Stock-based compensation represents the cost related to stock-based awards granted to employees and directors. Compensation expense for performance-based restricted stock unit awards is recognized as expense ratably for each installment from the date of the 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. Compensation expense for market-based awards is recognized as expense ratably over the measurement period, regardless of the actual level of achievement, provided the service requirement is met. The fair value of restricted stock units with time and performance conditions is determined based on the trading price of the company’s common shares on the date of grant. The fair value of awards with market conditions is estimated using a Monte Carlo simulation. 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 expense is recorded in selling, general and administrative expenses.
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 releases the income tax effects of deferred tax balances that have a valuation allowance from accumulated other comprehensive income once the reason the tax effects were established ceases to exist (e.g., a postretirement plan is liquidated). The company recognizes penalties and interest accrued related to income tax liabilities in provision for income taxes in its consolidated statements of income. The company treats the global intangible low-taxed income tax, or GILTI, as a period cost when included in U.S. taxable income, and the base erosion and anti-abuse tax, or BEAT, as a period cost when incurred.
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 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 expense, net.
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 derivatives (see Note 12), long-term debt (see Note 15), and to its postretirement plan assets (see Note 17).
Recent accounting pronouncements and accounting changes	Effective January 1, 2020, the company adopted ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract which clarifies the accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. The company adopted the new guidance on a prospective basis and the adoption did not have a material impact on its consolidated results of operations and financial position. Effective January 1, 2020, the company adopted 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, contract assets, loans and other financial instruments. The adoption did not have a material impact on the company’s consolidated results of operations and financial position. Effective January 1, 2020, the company adopted ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes which removed certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The new standard was applied to the presentation of the company’s U.S. Federal business, which is reflected in discontinued operations.

Summary of significant accoun_3

Summary of significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 Cash and cash equivalents $ 898.5 $ 538.8 Restricted cash 8.2 13.0 Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 906.7 $ 551.8
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, 2020 2019 Cash and cash equivalents $ 898.5 $ 538.8 Restricted cash 8.2 13.0 Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows $ 906.7 $ 551.8

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Results of U.S Federal Business Discontinued Operations	The results of the U.S. Federal business discontinued operations were as follows: Year ended December 31, 2020* 2019 2018 Revenue $ 149.5 $ 725.9 $ 573.8 Income (loss) Operations 8.4 100.3 72.2 Gain on sale 1,060.7 — — 1,069.1 100.3 72.2 Income tax provision 0.7 25.3 18.3 Income from discontinued operations, net of tax $ 1,068.4 $ 75.0 $ 53.9 * Includes results of operations through the March 13, 2020 closing date.

Cost-reduction actions (Tables)

Cost-reduction actions (Tables)	12 Months Ended
	Dec. 31, 2020
Restructuring and Related Activities [Abstract]
Schedule of Statement of Income Classifications for Charges (Credits) and Reconciliation of Liabilities and Expected Future Payments	The charges (credits) were recorded in the following statement of income classifications: Year ended December 31, 2020 2019 2018 Cost of revenue Services $ 22.2 $ 10.8 $ 18.1 Technology — 0.2 — Selling, general and administrative 38.5 15.5 1.6 Research and development 2.5 2.2 — Other (expenses), net 32.3 — — Total $ 95.5 $ 28.7 $ 19.7 Liabilities and expected future payments related to the company’s work-force reduction actions are as follows: Total U.S. International Balance at December 31, 2017 $ 113.5 $ 3.9 $ 109.6 Additional provisions 27.7 5.2 22.5 Payments (42.4) (3.1) (39.3) Changes in estimates (8.7) 0.1 (8.8) Translation adjustments (3.9) — (3.9) Balance at December 31, 2018 86.2 6.1 80.1 Additional provisions 25.7 4.6 21.1 Payments (57.7) (4.0) (53.7) Changes in estimates (3.6) (1.5) (2.1) Translation adjustments (0.8) — (0.8) Balance at December 31, 2019 49.8 5.2 44.6 Additional provisions 39.0 13.8 25.2 Payments (21.5) (3.2) (18.3) Changes in estimates (13.5) (2.7) (10.8) Translation adjustments 2.1 — 2.1 Balance at December 31, 2020 $ 55.9 $ 13.1 $ 42.8 Expected future payments on balance at December 31, 2020: In 2021 $ 40.7 $ 13.1 $ 27.6 Beyond 2021 15.2 — 15.2

Leases and commitments (Tables)

Leases and commitments (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Components of Lease Expense and Supplemental Cash Flow Information Related to Leases	The components of lease expense are as follows: Year ended December 31, 2020 2019 Operating lease cost $ 42.3 $ 37.9 Finance lease cost Amortization of right-of-use assets 1.7 1.6 Interest on lease liabilities 0.2 0.3 Total finance lease cost 1.9 1.9 Short-term lease costs 1.4 0.6 Variable lease cost 10.3 13.7 Sublease income (12.1) (0.7) Total lease cost $ 43.8 $ 53.4 Supplemental cash flow information related to leases is as follows: Years ended December 31, 2020 2019 Cash paid for amounts included in the measurement of lease liabilities: Cash payments for operating leases included in operating activities $ 41.6 $ 42.1 Cash payments for finance leases included in financing activities 1.8 1.7 Cash payments for finance lease included in operating activities 0.2 0.3 ROU assets obtained in exchange for lease obligations are as follows: Years ended December 31, 2020 2019 Operating leases $ 40.9 $ 17.4 Finance leases — 1.5
Schedule of Rental Expense and Income from Subleases	Rental expense and income from subleases for the year ended December 31, 2018, prior to the adoption of ASU 2016-02 were as follows: Year ended December 31, 2018 Rental expense, less income from subleases $ 55.5 Income from subleases $ 3.1
Supplemental Balance Sheet Information Related to Leases	Supplemental balance sheet information related to leases is as follows: As of December 31, 2020 2019 Operating Leases Operating lease right-of-use assets $ 79.3 $ 71.4 Other accrued liabilities 37.1 34.1 Long-term operating lease liabilities 62.4 56.0 Total operating lease liabilities $ 99.5 $ 90.1 Finance Leases Outsourcing assets, net $ 2.9 $ 4.6 Current maturities of long-term debt 2.4 1.8 Long-term debt 3.1 3.5 Total finance lease liabilities $ 5.5 $ 5.3 Weighted-Average Remaining Lease Term (in years) Operating leases 2.3 3.4 Finance leases 2.0 3.0 Weighted-Average Discount Rate Operating leases 6.4 % 6.4 % Finance leases 5.2 % 5.0 %
Maturities of Operating Lease Liabilities	Maturities of lease liabilities as of December 31, 2020 are as follows: Year Finance Leases Operating Leases 2021 $ 2.6 $ 40.8 2022 2.0 33.6 2023 0.7 19.6 2024 0.4 9.0 2025 — 4.4 Thereafter — 0.8 Total lease payments 5.7 108.2 Less imputed interest 0.2 8.7 Total $ 5.5 $ 99.5
Maturities of Finance Lease Liabilities	Maturities of lease liabilities as of December 31, 2020 are as follows: Year Finance Leases Operating Leases 2021 $ 2.6 $ 40.8 2022 2.0 33.6 2023 0.7 19.6 2024 0.4 9.0 2025 — 4.4 Thereafter — 0.8 Total lease payments 5.7 108.2 Less imputed interest 0.2 8.7 Total $ 5.5 $ 99.5
Schedule of Receivables Under Sales-Type Leases Before Allowance for Unearned Income	As of December 31, 2020, receivables under sales-type leases before the allowance for unearned income were collectible as follows: Year 2021 $ 14.9 2022 26.5 2023 16.4 2024 16.6 2025 10.1 Thereafter 3.2 Total $ 87.7

Other (expense), net (Tables)

Other (expense), net (Tables)	12 Months Ended
	Dec. 31, 2020
Other Income and Expenses [Abstract]
Schedule of Other (Expense) Net	Other (expense), net is comprised of the following: Year ended December 31, 2020 2019 2018 Postretirement expense* $ (235.9) $ (93.3) $ (80.3) Debt extinguishment charge (28.5) (20.1) — Foreign exchange losses** (36.2) (10.4) (5.9) Environmental costs and other, net (29.0) (12.6) 9.1 Total other expense, net $ (329.6) $ (136.4) $ (77.1) *Includes $142.1 million settlement charge in 2020 related to the U.S. defined benefit pension plans. **Includes $32.3 million for foreign currency losses in 2020 related to substantial completion of liquidation of foreign subsidiaries.

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Total Income (Loss) From Continuing Operations Before Income Taxes and Provision (Benefit) for Income Taxes	Following is the total income (loss) from continuing operations before income taxes and the provision (benefit) for income taxes. Year ended December 31, 2020 2019 2018 Income (loss) from continuing operations before income taxes United States $ (316.3) $ (148.4) $ (125.8) Foreign 44.5 87.8 196.8 Total income (loss) before income taxes from continuing operations $ (271.8) $ (60.6) $ 71.0 Provision (benefit) for income taxes Current United States $ 7.3 $ (17.7) $ (13.6) Foreign 51.5 41.0 51.4 Total 58.8 23.3 37.8 Deferred Foreign (13.4) 4.4 8.2 Total provision for income taxes $ 45.4 $ 27.7 $ 46.0
Reconciliation of the Provision (Benefit) for Income Taxes	Following is a reconciliation of the provision (benefit) for income taxes at the United States statutory tax rate to the provision for income taxes as reported: Year ended December 31, 2020 2019 2018 United States statutory income tax provision (benefit) $ (57.1) $ (12.7) $ 14.9 Income and losses for which no provision or benefit has been recognized 78.6 23.9 19.1 Foreign rate differential and other foreign tax expense 5.9 3.2 9.5 Income tax withholdings 16.8 17.6 19.3 Permanent items 0.8 (2.5) (5.0) Enacted rate changes (4.0) 0.5 (2.3) Change in uncertain tax positions 3.6 0.2 (1.2) Change in valuation allowances due to changes in judgment 2.9 (2.3) (5.9) Income tax credits, U.S. (2.1) (0.2) (2.4) Provision for income taxes $ 45.4 $ 27.7 $ 46.0
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 were as follows: As of December 31, 2020 2019 Deferred tax assets Tax loss carryforwards $ 795.2 $ 841.1 Postretirement benefits 253.0 434.4 Foreign tax credit carryforwards 201.3 211.5 Other tax credit carryforwards 29.2 30.3 Deferred revenue 31.1 42.8 Employee benefits and compensation 25.3 31.2 Purchased capitalized software 24.1 31.2 Depreciation 28.2 28.1 Warranty, bad debts and other reserves 10.5 5.9 Capitalized costs 8.1 7.1 Other 52.0 27.9 1,458.0 1,691.5 Valuation allowance (1,271.5) (1,524.7) Total deferred tax assets $ 186.5 $ 166.8 Deferred tax liabilities Capitalized research and development $ 47.4 $ 44.7 Other 29.8 29.0 Total deferred tax liabilities $ 77.2 $ 73.7 Net deferred tax assets $ 109.3 $ 93.1
Schedule of Tax Effected Tax Loss Carryforwards	At December 31, 2020, the company has tax effected tax loss carryforwards as follows: As of December 31, 2020 U.S. Federal $ 317.6 State and local 200.1 Foreign 277.5 Total tax loss carryforwards $ 795.2 These carryforwards will expire as follows: Year 2021 $ 15.7 2022 17.5 2023 13.6 2024 11.9 2025 13.2 Thereafter 723.3 Total $ 795.2
Schedule of Tax Credit Carryforwards	The company also has available tax credit carryforwards, which will expire as follows: Year 2021 $ 55.9 2022 38.1 2023 27.0 2024 22.5 2025 20.7 Thereafter 66.3 Total $ 230.5
Schedule of Cash Paid for Income Taxes, Net of Refunds	Cash paid for income taxes, net of refunds was as follows: Year ended December 31, 2020 2019 2018 Cash paid for income taxes, net of refunds $ 24.7 $ 37.6 $ 39.1
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, 2020 2019 2018 Balance at January 1 $ 25.6 $ 18.9 $ 27.9 Additions based on tax positions related to the current year 8.5 11.1 2.6 Changes for tax positions of prior years (0.7) (0.6) (6.1) Reductions as a result of a lapse of applicable statute of limitations (2.3) (2.3) (2.4) Settlements (1.8) (1.1) (1.5) Changes due to foreign currency 1.6 (0.4) (1.6) Balance at December 31 $ 30.9 $ 25.6 $ 18.9

Earnings per common share (Tabl

Earnings per common share (Tables)	12 Months Ended
	Dec. 31, 2020
Earnings Per Share [Abstract]
Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation	The following table shows how earnings (loss) per common share attributable to Unisys Corporation was computed for the three years ended December 31, 2020 (shares in thousands). Year ended December 31, 2020 2019 2018 Basic earnings (loss) per common share computation: Net income (loss) from continuing operations attributable to Unisys Corporation $ (317.7) $ (92.2) $ 21.6 Income from discontinued operations, net of tax 1,068.4 75.0 53.9 Net income (loss) attributable to Unisys Corporation $ 750.7 $ (17.2) $ 75.5 Weighted average shares 62,932 55,961 50,946 Basic earnings (loss) per share attributable to Unisys Corporation Continuing operations $ (5.05) $ (1.65) $ 0.42 Discontinued operations 16.98 1.34 1.06 Total $ 11.93 $ (0.31) $ 1.48 Diluted earnings (loss) per common share computation: Net income (loss) from continuing operations attributable to Unisys Corporation $ (317.7) $ (92.2) $ 21.6 Add interest expense on convertible senior notes, net of tax of zero — — — Net income (loss) from continuing operations attributable to Unisys Corporation for diluted earnings per share (317.7) (92.2) 21.6 Income from discontinued operations, net of tax 1,068.4 75.0 53.9 Net income (loss) attributable to Unisys Corporation for diluted earnings per share $ 750.7 $ (17.2) $ 75.5 Weighted average shares 62,932 55,961 50,946 Plus incremental shares from assumed conversions: Employee stock plans — — 541 Convertible senior notes — — — Adjusted weighted average shares 62,932 55,961 51,487 Diluted earnings (loss) per common share attributable to Unisys Corporation Continuing operations $ (5.05) $ (1.65) $ 0.42 Discontinued operations 16.98 1.34 1.05 Total $ 11.93 $ (0.31) $ 1.47 Anti-dilutive weighted-average stock options and restricted stock units (i) 579 1,393 1,226 Anti-dilutive weighted-average common shares issuable upon conversion of the 5.50% convertible senior notes (i) (see Note 15) 3,425 16,578 21,868 (i) 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.

Contract assets and deferred _2

Contract assets and deferred revenue (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Net Contract Assets (Liabilities)	Net contract assets (liabilities) are as follows: As of December 31, 2020 2019 Contract assets - current $ 44.3 $ 38.4 Contract assets - long-term (i) 20.7 21.6 Deferred revenue - current (257.1) (246.4) Deferred revenue - long-term (137.9) (147.0) (i) Reported in other long-term assets on the company’s consolidated balance sheets Significant changes in the above contract asset and liability balances were as follows: Year ended December 31, 2020 2019 Revenue recognized that was included in deferred revenue at the beginning of the period $ 236.1 $ 270.1

Capitalized contract costs (Tab

Capitalized contract costs (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Schedule of Deferred Commissions and Amortization Expenses	Deferred commissions were as follows: As of December 31, 2020 2019 Deferred commissions $ 8.7 $ 9.1 Amortization expense related to deferred commissions was as follows: Year ended December 31, 2020 2019 2018 Deferred commissions - amortization expense (i) $ 3.2 $ 3.1 $ 6.5 (i) Reported in selling, general and administrative expense in the company’s consolidated statements of income Costs to fulfill a contract were as follows: As of December 31, 2020 2019 Costs to fulfill a contract $ 74.4 $ 75.8 Amortization expense related to costs to fulfill a contract was as follows: Year ended December 31, 2020 2019 2018 Costs to fulfill a contract - amortization expense $ 27.5 $ 24.2 $ 21.7

Financial instruments and con_2

Financial instruments and concentration of credit risks (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 Balance Sheet Location Prepaid expenses and other current assets $ 1.4 $ 2.1 Other accrued liabilities 1.0 0.1 Total fair value $ 0.4 $ 2.0
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. Year Ended December 31, 2020 2019 2018 Statement of Income Location Other (expense), net $ 7.6 $ 1.7 $ (14.2)

Properties (Tables)

Properties (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Components of Properties	Properties comprise the following: As of December 31, 2020 2019 Land $ 2.3 $ 2.3 Buildings 63.5 63.5 Machinery and office equipment 466.7 521.5 Internal-use software 171.2 161.8 Rental equipment 23.3 34.9 Total properties $ 727.0 $ 784.0

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill by Segment	Changes in the carrying amount of goodwill by segment were as follows: Total Services Technology Balance at December 31, 2018 $ 111.0 $ 10.9 $ 100.1 Translation adjustments (0.6) (0.6) — Balance at December 31, 2019 110.4 10.3 100.1 Translation adjustments (1.8) — (1.8) Balance at December 31, 2020 $ 108.6 $ 10.3 $ 98.3

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Components of Long-Term Debt	Long-term debt is comprised of the following: As of December 31, 2020 2019 6.875% senior secured notes due November 1, 2027 (Face value of $485.0 million less unamortized issuance costs of $8.1 million at December 31, 2020) $ 476.9 $ — 5.50% convertible senior notes due March 1, 2021 (Face value of $84.2 million less unamortized discount and issuance costs of $0.6 million and $4.2 million at December 31, 2020 and 2019, respectively) 83.6 80.0 10.75% senior secured notes ($440.0 million face value less unamortized issuance costs of $5.5 million at December 31, 2019) — 434.5 Finance leases 5.5 5.3 Other debt 63.9 59.6 Total 629.9 579.4 Less – current maturities 102.8 13.5 Total long-term debt $ 527.1 $ 565.9
Estimated Fair Values of Long-term Debt	Presented below are the estimated fair values of long-term debt. As of December 31, 2020 2019 6.875% senior secured notes due November 1, 2027 $ 532.3 $ — 5.50% convertible senior notes due March 1, 2021 169.8 115.8 10.75% senior secured notes — 474.2
Schedule of Maturities of Long-term Debt, Including Finance Leases	Maturities of long-term debt, including finance leases, in each of the next five years and thereafter are as follows: Year Total Long-Term Debt Finance Leases 2021 $ 102.8 $ 100.4 $ 2.4 2022 18.2 16.2 2.0 2023 16.5 15.8 0.7 2024 9.8 9.4 0.4 2025 2.8 2.8 — Thereafter 479.8 479.8 — Total $ 629.9 $ 624.4 $ 5.5
Schedule of Cash Paid for Interest, Capitalized Interest, and Interest Expense	Cash paid for interest and capitalized interest expense was as follows: Year ended December 31, 2020 2019 2018 Cash paid for interest $ 32.9 $ 61.5 $ 59.5 Capitalized interest expense $ 4.6 $ 6.6 $ 6.0 Interest expense related to the 2027 Notes is comprised of the following: Year ended December 31, 2020 Contractual interest coupon $ 5.7 Amortization of issuance costs 0.2 Total $ 5.9 Interest expense related to the 2022 Notes is comprised of the following: Year ended December 31, 2020 2019 2018 Contractual interest coupon $ 13.8 $ 47.3 $ 47.3 Amortization of issuance costs 0.7 2.4 2.4 Total $ 14.5 $ 49.7 $ 49.7 Interest expense related to the 2021 Notes is comprised of the following: Year ended December 31, 2020 2019 2018 Contractual interest coupon $ 4.6 $ 8.9 $ 11.8 Amortization of debt discount 3.1 5.5 6.6 Amortization of debt issuance costs 0.5 0.9 1.2 Total $ 8.2 $ 15.3 $ 19.6

Other accrued liabilities (Tabl

Other accrued liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Other Accrued Liabilities (Current)	Other accrued liabilities (current) are comprised of the following: As of December 31, 2020 2019 Payrolls and commissions $ 95.9 $ 106.8 Income taxes 41.2 28.6 Cost reduction 40.7 47.5 Operating leases 37.1 34.1 Taxes other than income taxes 33.0 18.3 Accrued vacations 24.3 24.7 Postretirement 11.7 13.6 Accrued interest 8.0 11.8 Other 60.1 31.3 Total other accrued liabilities $ 352.0 $ 316.7

Employee plans (Tables)

Employee plans (Tables)	12 Months Ended
	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Summary of Restricted Stock Unit Activity	A summary of restricted stock unit activity for the year ended December 31, 2020 follows (shares in thousands): Restricted Stock Units Weighted-Average Grant-Date Fair Value Outstanding at December 31, 2019 2,040 $ 14.17 Granted 752 22.48 Vested (940) 13.80 Forfeited and expired (126) 16.10 Outstanding at December 31, 2020 1,726 17.87
Schedule of Weighted-Average Assumptions	The fair value of awards with market conditions is estimated using a Monte Carlo simulation with the following weighted-average assumptions. Year ended December 31, 2020 2019 Weighted-average fair value of grant $ 28.33 $ 16.58 Risk-free interest rate (i) 1.35 % 2.49 % Expected volatility (ii) 51.81 % 47.91 % Expected life of restricted stock units in years (iii) 2.86 2.87 Expected dividend yield — % — % (i) Represents the continuously compounded semi-annual zero-coupon U.S. treasury rate commensurate with the remaining performance period (ii) Based on historical volatility for the company that is commensurate with the length of the performance period (iii) Represents the remaining life of the longest performance period
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 follows: As of December 31, 2020 2019 Accumulated benefit obligation $ 6,060.7 $ 6,896.5 Fair value of plan assets $ 4,839.5 $ 5,014.1
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 follows: As of December 31, 2020 2019 Projected benefit obligation $ 6,063.0 $ 6,898.7 Fair value of plan assets $ 4,839.5 $ 5,014.1
Assumed Health Care Cost Trend Rates	Assumed health care cost trend rates at December 31, 2020 2019 Health care cost trend rate assumed for next year 5.4 % 5.8 % Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) 4.5 % 4.5 % Year that the rate reaches the ultimate trend rate 2025 2025
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, 2020. U.S. Plans International Plans As of December 31, 2020 Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Pension plans Equity Securities Common Stocks $ 774.1 $ 771.2 $ 2.9 $ — $ — $ — $ — $ — Commingled Funds 640.6 640.6 153.4 153.4 Debt Securities U.S. Govt. Securities 388.5 388.5 Other Fixed Income 589.9 589.9 125.8 125.8 Insurance Contracts 127.5 127.5 Commingled Funds 689.9 689.9 471.2 471.2 Real Estate Real Estate Investment Trusts 112.1 112.1 2.0 2.0 Other Derivatives (i) (67.3) 5.0 (72.3) 20.5 20.5 Commingled Funds 381.4 381.4 Pooled Funds 233.4 233.4 178.0 178.0 Cumulative futures contracts variation margin paid to brokers (1.1) (1.1) Cash 21.8 21.8 111.7 111.7 Receivables 28.8 28.8 2.1 2.1 Payables (7.3) (7.3) (20.7) (20.7) Total plan assets in fair value hierarchy $ 3,403.4 $ 1,319.0 $ 2,084.4 $ — $ 1,552.9 $ 93.1 $ 1,332.3 $ 127.5 Plan assets measured using NAV as a practical expedient (ii): Commingled Funds Equity $ — $ 429.9 Debt 121.7 1,067.4 Other 104.2 27.4 Private Real Estate 208.0 51.8 Private Equity 10.5 — Total pension plan assets $ 3,847.8 $ 3,129.4 Other postretirement plans Insurance Contracts $ 6.0 $ 6.0 (i) Level 1 derivatives represent unrealized appreciation or depreciation on open futures contracts. The value of open futures contracts includes derivatives and the cumulative futures contracts variation margin paid to or received from brokers. (ii) 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, 2019. U.S. Plans International Plans As of December 31, 2019 Fair Value Level 1 Level 2 Level 3 Fair Value Level 1 Level 2 Level 3 Pension plans Equity Securities Common Stocks $ 955.3 $ 952.8 $ 2.5 $— $ — $ — $ — $ — Commingled Funds 578.8 578.8 176.7 176.7 Debt Securities U.S. Govt. Securities 436.0 436.0 Other Fixed Income 278.1 278.1 91.0 — 91.0 Insurance Contracts 123.1 123.1 Commingled Funds 433.6 433.6 441.0 441.0 Real Estate Real Estate Investment Trusts 14.0 14.0 1.0 1.0 Commingled Funds 186.5 186.5 Other Derivatives (i) (103.5) (8.2) (95.3) 6.5 6.5 Commingled Funds 372.8 372.8 Pooled Funds 135.5 135.5 189.2 189.2 Cumulative futures contracts variation margin received from brokers 8.2 8.2 Cash 2.0 2.0 18.1 18.1 Receivables 14.4 14.4 0.2 0.2 Payables (7.4) (7.4) (7.3) (7.3) Total plan assets in fair value hierarchy $ 2,931.5 $ 1,411.8 $ 1,519.7 $ — $ 1,412.3 $ 11.0 $ 1,278.2 $ 123.1 Plan assets measured using NAV as a practical expedient (ii): Commingled Funds Equity $ — $ 406.9 Debt 86.3 941.0 Other 127.0 24.8 Private Real Estate 189.0 31.4 Private Equity 0.4 — Total pension plan assets $ 3,334.2 $ 2,816.4 Other postretirement plans Insurance Contracts $ 6.9 $ 6.9 (i) Level 1 derivatives represent unrealized appreciation or depreciation on open futures contracts. The value of open futures contracts includes derivatives and the cumulative futures contracts variation margin received from brokers. (ii) 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, 2020. January 1, Realized Purchases Sales Currency and unrealized gains (losses) relating to instruments still held at December 31, 2020 December 31, U.S. plans Other postretirement plans Insurance Contracts $ 6.9 $ (0.4) $ — $ (0.5) $ — $ 6.0 International pension plans Insurance Contracts $ 123.1 $ — $ 4.1 $ (11.5) $ 11.8 $ 127.5 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, 2019. January 1, Realized Purchases Sales Currency and unrealized gains (losses) relating to instruments still held at December 31, 2019 December 31, U.S. plans Other postretirement plans Insurance Contracts $ 7.8 $ (0.3) $ — $ (0.6) $ — $ 6.9 International pension plans Insurance Contracts $ 123.7 $ — $ 6.4 $ (12.0) $ 5.0 $ 123.1
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. 2020 2019 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 $ 121.7 $ — Monthly 45 days $ 86.3 $ — Monthly 45 days Other 104.2 — Monthly 5 days 127.0 — Monthly 5 days Private Real Estate (i) 208.0 15.7 Quarterly 60-90 days 189.0 44.4 Quarterly 60-90 days Private Equity (ii) 10.5 20.9 0.4 — Total $ 444.4 $ 36.6 $ 402.7 $ 44.4 International pension plans Commingled Funds Equity $ 429.9 $ — Weekly Up to 2 days $ 406.9 $ — Weekly Up to 2 days Debt 1,067.4 86.2 Weekly, Bimonthly, Monthly, Quarterly Up to 120 days 941.0 117.9 Daily, Weekly, Biweekly, Bimonthly, Monthly, Quarterly Up to 120 days Other 27.4 — Monthly Up to 30 days 24.8 — Monthly Up to 30 days Private Real Estate 51.8 — Monthly Up to 90 days 31.4 — Monthly Up to 90 days Total $ 1,576.5 $ 86.2 $ 1,404.1 $ 117.9 (i) Includes investments in private real estate funds. The funds invest in U.S. real estate and allow redemptions quarterly, though queues, restrictions and gates may extend the period. A redemption has been requested from one fund, which has a redemption queue with estimates of full receipt of three
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Schedule of Weighted-Average Assumptions	Weighted-average assumptions used to determine net periodic pension cost were as follows: U.S. Plans International Plans Year ended December 31, 2020 2019 2018 2020 2019 2018 Discount rate 3.53 % 4.50 % 3.87 % 1.82 % 2.55 % 2.24 % Expected long-term rate of return on assets 6.50 % 6.80 % 6.80 % 3.50 % 4.18 % 4.38 % Weighted-average assumptions used to determine benefit obligations at December 31 were as follows: Discount rate 2.85 % 3.53 % 4.50 % 1.23 % 1.82 % 2.55 %
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 follows: U.S. Plans International Plans As of December 31, 2020 2019 2020 2019 Change in projected benefit obligation Benefit obligation at beginning of year $ 4,755.6 $ 4,558.0 $ 3,143.8 $ 2,829.5 Service cost — — 2.8 2.8 Interest cost 162.5 197.5 53.4 68.3 Plan participants’ contributions — — 1.1 1.3 Plan curtailment — — (1.6) (1.6) Plan settlement (277.3) — — (3.5) Actuarial loss 253.9 357.7 226.5 284.1 Benefits paid (349.4) (357.6) (119.0) (118.1) Foreign currency translation adjustments — — 161.0 81.0 Benefit obligation at end of year $ 4,545.3 $ 4,755.6 $ 3,468.0 $ 3,143.8 Change in plan assets Fair value of plan assets at beginning of year $ 3,334.2 $ 3,112.8 $ 2,816.4 $ 2,539.4 Actual return on plan assets 347.2 505.2 254.7 300.0 Employer contribution 793.1 73.8 33.1 30.1 Plan participants’ contributions — — 1.1 1.3 Plan settlement (277.3) — — (3.5) Benefits paid (349.4) (357.6) (119.0) (118.1) Foreign currency translation adjustments — — 143.1 67.2 Fair value of plan assets at end of year $ 3,847.8 $ 3,334.2 $ 3,129.4 $ 2,816.4 Funded status at end of year $ (697.5) $ (1,421.4) $ (338.6) $ (327.4) Amounts recognized in the consolidated balance sheets consist of: Prepaid postretirement assets $ 27.2 $ — $ 160.3 $ 135.9 Other accrued liabilities (6.1) (6.8) (0.2) (0.2) Long-term postretirement liabilities (718.6) (1,414.6) (498.7) (463.1) Total funded status $ (697.5) $ (1,421.4) $ (338.6) $ (327.4) Accumulated other comprehensive loss, net of tax Net loss $ 2,510.4 $ 2,672.7 $ 1,116.9 $ 1,067.2 Prior service credit $ (32.3) $ (34.8) $ (45.9) $ (46.4) Accumulated benefit obligation $ 4,545.3 $ 4,755.6 $ 3,360.4 $ 3,035.3
Components of Net Periodic Cost (Income)	Net periodic pension cost (income) includes the following components: U.S. Plans International Plans Year ended December 31, 2020 2019 2018 2020 2019 2018 Service cost (i) $ — $ — $ — $ 2.8 $ 2.8 $ 3.2 Interest cost 162.5 197.5 186.6 53.4 68.3 67.3 Expected return on plan assets (208.6) (218.2) (230.6) (90.6) (104.6) (114.4) Amortization of prior service credit (2.5) (2.5) (2.5) (2.5) (2.5) (3.7) Recognized net actuarial loss 135.5 116.6 125.1 43.2 34.2 42.3 Curtailment gain — — — — (0.1) — Settlement loss 142.1 — — — 1.2 6.4 Net periodic pension cost (income) $ 229.0 $ 93.4 $ 78.6 $ 6.3 $ (0.7) $ 1.1 (i) Service cost is reported in cost of revenue - services and selling, general and administrative expenses. All other components of net periodic pension cost are reported in other expense, net in the consolidated statements of income.
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 32 % 26-38% 19 % 16-23% Debt securities 53 % 49-57% 61 % 54-67% Real estate 0 % 0 % 1 % 0-3% Cash 0 % 0-5% 1 % 0-5% Other 15 % 5-25% 18 % 11-26%
Expected Future Benefit Payments	As of December 31, 2020, the following benefit payments are expected to be paid from the defined benefit pension plans: Year ending December 31, U.S. International 2021 $ 352.8 $ 114.8 2022 346.5 117.7 2023 339.6 121.1 2024 331.9 125.0 2025 323.0 126.9 2026 - 2030 1,453.2 677.3
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Schedule of Weighted-Average Assumptions	Weighted-average assumptions used to determine net periodic postretirement benefit cost were as follows: Year ended December 31, 2020 2019 2018 Discount rate 5.13 % 5.67 % 5.30 % 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, 2020 2019 2018 Discount rate 2.21 % 5.13 % 5.67 %
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 plans follows: As of December 31, 2020 2019 Change in accumulated benefit obligation Benefit obligation at beginning of year $ 95.7 $ 96.2 Service cost 0.5 0.5 Interest cost 4.4 4.8 Plan participants’ contributions 2.3 2.7 Actuarial loss (gain) (13.8) 1.0 Benefits paid (8.8) (8.9) Foreign currency translation and other adjustments (0.1) (0.6) Benefit obligation at end of year $ 80.2 $ 95.7 Change in plan assets Fair value of plan assets at beginning of year $ 6.9 $ 7.8 Actual return on plan assets (0.4) (0.2) Employer contributions 6.0 5.5 Plan participants’ contributions 2.3 2.7 Benefits paid (8.8) (8.9) Fair value of plan assets at end of year $ 6.0 $ 6.9 Funded status at end of year $ (74.2) $ (88.8) Amounts recognized in the consolidated balance sheets consist of: Prepaid postretirement assets $ — $ 0.3 Other accrued liabilities (5.4) (6.6) Long-term postretirement liabilities (68.8) (82.5) Total funded status $ (74.2) $ (88.8) Accumulated other comprehensive loss, net of tax Net loss $ (3.0) $ 11.1 Prior service credit (4.9) (6.6)
Components of Net Periodic Cost (Income)	Net periodic postretirement benefit cost follows: Year ended December 31, 2020 2019 2018 Service cost (i) $ 0.5 $ 0.5 $ 0.6 Interest cost 4.4 4.8 4.8 Expected return on assets (0.4) (0.4) (0.4) Amortization of prior service cost (1.6) (1.7) (1.6) Recognized net actuarial loss 1.0 0.7 1.0 Net periodic benefit cost $ 3.9 $ 3.9 $ 4.4 (i) Service cost is reported in selling, general and administrative expenses. All other components of net periodic benefit cost are reported in other expense, net in the consolidated statements of income.
Expected Future Benefit Payments	As of December 31, 2020, the following benefits are expected to be paid from the company’s postretirement plans: Year ending December 31, Expected 2021 $ 6.3 2022 6.0 2023 5.6 2024 5.3 2025 4.9 2026 – 2030 19.9

Stockholders' equity (Tables)

Stockholders' equity (Tables)	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive income (loss) attributable to Unisys Corporation is as follows: Total Translation Postretirement Balance at December 31, 2017 $ (3,815.8) $ (817.0) $ (2,998.8) Reclassification pursuant to ASU No. 2018-02 (208.7) — (208.7) Other comprehensive income before reclassifications 96.7 (79.7) 176.4 Amounts reclassified from accumulated other comprehensive income (157.0) — (157.0) Current period other comprehensive income (269.0) (79.7) (189.3) Balance at December 31, 2018 (4,084.8) (896.7) (3,188.1) Other comprehensive income before reclassifications 136.8 23.8 113.0 Amounts reclassified from accumulated other comprehensive income (140.6) — (140.6) Current period other comprehensive income (3.8) 23.8 (27.6) Balance at December 31, 2019 (4,088.6) (872.9) (3,215.7) Other comprehensive income before reclassifications 489.4 78.6 410.8 Amounts reclassified from accumulated other comprehensive income (340.3) (32.3) (308.0) Current period other comprehensive income 149.1 46.3 102.8 Balance at December 31, 2020 $ (3,939.5) $ (826.6) $ (3,112.9)
Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss)	Amounts reclassified out of accumulated other comprehensive loss are as follows: Year ended December 31, 2020 2019 2018 Translation Adjustments: Adjustment for substantial completion of liquidation of foreign subsidiaries (i) $ (32.3) $ — $ — Postretirement Plans: Amortization of prior service cost (ii) 5.9 5.9 7.1 Amortization of actuarial losses (ii) (177.3) (149.7) (165.9) Settlement loss (ii) (142.1) (1.1) (3.9) Total before tax (345.8) (144.9) (162.7) Income tax benefit 5.5 4.3 5.7 Total reclassifications for the period $ (340.3) $ (140.6) $ (157.0) (i) Reported in other expense, net in the consolidated statements of income (ii) Included in net periodic postretirement cost (see Note 17)
Changes in Common Stock and Treasury Stock	The following table summarizes the changes in shares of common stock and treasury stock: Common Treasury Balance at December 31, 2017 53.4 2.9 Stock-based compensation 0.8 0.2 Balance at December 31, 2018 54.2 3.1 Debt exchange 10.6 — Stock-based compensation 1.1 0.4 Balance at December 31, 2019 65.9 3.5 Stock-based compensation 0.9 0.3 Balance at December 31, 2020 66.8 3.8

Segment information (Tables)

Segment information (Tables)	12 Months Ended
	Dec. 31, 2020
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, 2020 2019 2018 Services Cloud & infrastructure services $ 1,178.1 $ 1,287.2 $ 1,225.4 Application services 350.2 370.9 381.7 BPO solutions 164.6 234.6 250.5 Total Services 1,692.9 1,892.7 1,857.6 Technology 333.4 330.1 393.6 Total customer revenue $ 2,026.3 $ 2,222.8 $ 2,251.2
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) from continuing operations before income taxes: Year ended December 31, 2020 2019 2018 Total segment operating income $ 154.8 $ 180.1 $ 233.4 Interest expense (29.2) (62.1) (64.0) Other (expense), net (329.6) (136.4) (77.1) Cost reduction charges (i) (63.2) (28.7) (19.7) Corporate and eliminations (4.6) (13.5) (1.6) Total income (loss) from continuing operations before income taxes $ (271.8) $ (60.6) $ 71.0 (i) Year ended December 31, 2020 excludes $32.3 million for net foreign currency losses related to exiting foreign countries which are reported in other 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, 2020 2019 2018 Total segment assets $ 1,302.3 $ 1,263.4 $ 1,254.7 Cash and cash equivalents 898.5 538.8 605.0 Deferred income taxes 136.2 114.0 109.3 Operating lease right-of-use assets 79.3 71.4 — Prepaid postretirement assets 187.5 136.2 147.6 Assets of discontinued operations — 243.2 181.9 Other corporate assets 104.1 137.0 159.1 Total assets $ 2,707.9 $ 2,504.0 $ 2,457.6
Summary of Operations by Business Segment	A summary of the company’s operations by business segment is presented below: Total Corporate Services Technology 2020 Customer revenue $ 2,026.3 $ — $ 1,692.9 $ 333.4 Intersegment — (16.3) — 16.3 Total revenue $ 2,026.3 $ (16.3) $ 1,692.9 $ 349.7 Operating income (loss) $ 87.0 $ (67.8) $ 12.2 $ 142.6 Depreciation and amortization 161.0 — 70.9 90.1 Total assets 2,707.9 1,405.6 850.5 451.8 Capital expenditures 130.1 2.5 49.2 78.4 2019 Customer revenue $ 2,222.8 $ — $ 1,892.7 $ 330.1 Intersegment — (15.2) — 15.2 Total revenue $ 2,222.8 $ (15.2) $ 1,892.7 $ 345.3 Operating income (loss) $ 137.9 $ (42.2) $ 20.8 $ 159.3 Depreciation and amortization 147.4 — 91.9 55.5 Total assets 2,504.0 1,240.6 864.2 399.2 Capital expenditures 159.8 7.1 74.0 78.7 2018 Customer revenue $ 2,251.2 $ — $ 1,857.6 $ 393.6 Intersegment — (24.7) — 24.7 Total revenue $ 2,251.2 $ (24.7) $ 1,857.6 $ 418.3 Operating income (loss) $ 212.1 $ (21.3) $ 9.1 $ 224.3 Depreciation and amortization 164.1 — 97.2 66.9 Total assets 2,457.6 1,202.9 846.9 407.8 Capital expenditures 189.3 8.0 92.9 88.4
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, 2020 2019 2018 Revenue United States $ 781.5 $ 824.0 $ 666.2 United Kingdom 228.0 334.3 360.7 Other foreign 1,016.8 1,064.5 1,224.3 Total Revenue $ 2,026.3 $ 2,222.8 $ 2,251.2 Properties, net United States $ 82.0 $ 82.3 $ 75.9 United Kingdom 9.2 10.5 5.3 Other foreign 19.3 23.2 30.7 Total Properties, net $ 110.5 $ 116.0 $ 111.9 Outsourcing assets, net United States $ 93.1 $ 99.5 $ 97.6 United Kingdom 55.3 71.7 86.5 Australia 19.3 21.5 21.7 Other foreign 6.2 9.4 10.6 Total Outsourcing assets, net $ 173.9 $ 202.1 $ 216.4

Quarterly financial informati_2

Quarterly financial information (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Information	First Second Third Fourth Year 2020 Revenue $ 515.4 $ 438.8 $ 495.2 $ 576.9 $ 2,026.3 Gross profit 113.1 74.9 119.9 175.1 483.0 Income (loss) from continuing operations before income taxes (41.9) (66.8) (7.2) (155.9) (271.8) Income (loss) from discontinued operations, net of tax 1,068.5 (2.1) 0.4 1.6 1,068.4 Net income (loss) attributable to Unisys Corporation 1,015.3 (78.6) (12.9) (173.1) 750.7 Earnings (loss) per common share attributable to Unisys Corporation Basic Continuing operations $ (0.85) $ (1.21) $ (0.21) $ (2.77) $ (5.05) Discontinued operations 17.06 (0.04) 0.01 0.02 16.98 Total $ 16.21 $ (1.25) $ (0.20) $ (2.75) $ 11.93 Diluted Continuing operations $ (0.85) $ (1.21) $ (0.21) $ (2.77) $ (5.05) Discontinued operations 17.06 (0.04) 0.01 0.02 16.98 Total $ 16.21 $ (1.25) $ (0.20) $ (2.75) $ 11.93 2019 Revenue $ 554.5 $ 569.4 $ 552.1 $ 546.8 $ 2,222.8 Gross profit 125.1 152.6 140.0 116.3 534.0 Income (loss) from continuing operations before income taxes (20.7) 7.9 (15.0) (32.8) (60.6) Income from discontinued operations, net of tax 13.3 25.5 16.0 20.2 75.0 Net income (loss) attributable to Unisys Corporation (19.4) 26.2 (13.2) (10.8) (17.2) Earnings (loss) per common share attributable to Unisys Corporation Basic Continuing operations $ (0.64) $ 0.01 $ (0.50) $ (0.50) $ (1.65) Discontinued operations 0.26 0.50 0.27 0.33 1.34 Total $ (0.38) $ 0.51 $ (0.23) $ (0.17) $ (0.31) Diluted Continuing operations $ (0.64) $ 0.01 $ (0.50) $ (0.50) $ (1.65) Discontinued operations 0.26 0.49 0.27 0.33 1.34 Total $ (0.38) $ 0.50 $ (0.23) $ (0.17) $ (0.31)

Summary of significant accoun_4

Summary of significant accounting policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash and cash equivalents	$ 898.5	$ 538.8	$ 605
Restricted cash	8.2	13
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows	$ 906.7	$ 551.8	$ 624.1	$ 764.1

Summary of significant accoun_5

Summary of significant accounting policies - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)institution	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to cost of revenue	$ (1,543.3)	$ (1,688.8)	$ (1,666.9)
Period of recognition in changes in fair value of plan assets	4 years
Technology
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to cost of revenue	$ (113.9)	(98.2)	$ (99.1)
Intelligent Processing Solutions Ltd.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Percentage of ownership interest	51.00%
Number of financial institutions that own remaining interests for which iPSL performs services | institution	3
Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease to cost of revenue		$ 19.8
Enterprise Software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated revenue-producing lives of computer software products from the date of release	5 years
Enterprise Software | Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated revenue-producing lives of computer software products from the date of release	3 years
Remaining Products
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated revenue-producing lives of computer software products from the date of release	3 years
Minimum | Technology
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Period over which payment is generally received for contracts	30 days
Maximum | Technology
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Period over which payment is generally received for contracts	60 days
Buildings | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	20 years
Buildings | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	50 years
Machinery and office equipment | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	4 years
Machinery and office equipment | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	7 years
Rental equipment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	4 years
Internal-use software | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	3 years
Internal-use software | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful lives	10 years

Discontinued Operations (Detail

Discontinued Operations (Details) - USD ($) $ in Millions	Mar. 13, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash purchase price										$ 1,162.9	$ 0	$ 0
Income (loss)
Income from discontinued operations, net of tax		$ 1.6	$ 0.4	$ (2.1)	$ 1,068.5	$ 20.2	$ 16	$ 25.5	$ 13.3	1,068.4	75	53.9
U.S. Federal Business | Discontinued Operation, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash purchase price	$ 1,200
Net cash proceeds of the sale (net of working capital adjustments and transaction costs)	$ 1,162.9
Revenue										149.5	725.9	573.8
Income (loss)
Operations										8.4	100.3	72.2
Gain on sale										1,060.7	0	0
Income (loss) from discontinued operation										1,069.1	100.3	72.2
Income tax provision										0.7	25.3	18.3
Income from discontinued operations, net of tax										$ 1,068.4	$ 75	$ 53.9

Cost-reduction actions - Additi

Cost-reduction actions - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	$ 46.9	$ 13.2	$ 7.9	$ 27.5	$ 23.3	$ 0.2	$ 2.6	$ 2.6	$ 95.5	$ 28.7	$ 19.7
Charges related to work-force reductions									25.5	22.1	19
Other expenses related to the cost-reduction effort									70	6.6
Employee severance
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs									39	25.7	27.7
Charges related to work-force reductions									39	25.7	27.7
Changes in estimates
Restructuring Cost and Reserve [Line Items]
Charges related to work-force reductions									(13.5)	3.6	8.7
Foreign currency losses related to exiting foreign countries
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort									32.3
Asset impairments
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort									24
Other expenses
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort									$ 13.7	0.9
Lease abandonment costs
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort										4.6
Asset write-offs
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort										$ 1.1
Idle leased facilities
Restructuring Cost and Reserve [Line Items]
Other expenses related to the cost-reduction effort											$ 0.7

Cost-reduction actions - Statem

Cost-reduction actions - Statement of Income Classifications (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs	$ 46.9	$ 13.2	$ 7.9	$ 27.5	$ 23.3	$ 0.2	$ 2.6	$ 2.6	$ 95.5	$ 28.7	$ 19.7
Cost of revenue | Services
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs									22.2	10.8	18.1
Cost of revenue | Technology
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs									0	0.2	0
Selling, general and administrative
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs									38.5	15.5	1.6
Research and development
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs									2.5	2.2	0
Other (expenses), net
Restructuring Cost and Reserve [Line Items]
Cost-reduction charges and other costs									$ 32.3	$ 0	$ 0

Cost-reduction actions - Reconc

Cost-reduction actions - Reconciliation of Liabilities and Expected Future Payments (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2021
Restructuring Reserve [Roll Forward]
Additional provisions	$ 46.9	$ 13.2	$ 7.9	$ 27.5	$ 23.3	$ 0.2	$ 2.6	$ 2.6	$ 95.5	$ 28.7	$ 19.7
Work-Force Reductions
Restructuring Reserve [Roll Forward]
Balance at beginning of period				49.8				86.2	49.8	86.2	113.5
Additional provisions									39	25.7	27.7
Payments									(21.5)	(57.7)	(42.4)
Changes in estimates									(13.5)	(3.6)	(8.7)
Translation adjustments									2.1	(0.8)	(3.9)
Balance at end of period	55.9				49.8				55.9	49.8	86.2
In 2021	40.7								40.7
Beyond 2021	40.7								40.7
Work-Force Reductions | Forecast
Restructuring Reserve [Roll Forward]
In 2021												$ 15.2
Beyond 2021												15.2
Work-Force Reductions | U.S.
Restructuring Reserve [Roll Forward]
Balance at beginning of period				5.2				6.1	5.2	6.1	3.9
Additional provisions									13.8	4.6	5.2
Payments									(3.2)	(4)	(3.1)
Changes in estimates									(2.7)	(1.5)	0.1
Translation adjustments									0	0	0
Balance at end of period	13.1				5.2				13.1	5.2	6.1
In 2021	13.1								13.1
Beyond 2021	13.1								13.1
Work-Force Reductions | U.S. | Forecast
Restructuring Reserve [Roll Forward]
In 2021												0
Beyond 2021												0
Work-Force Reductions | International
Restructuring Reserve [Roll Forward]
Balance at beginning of period				$ 44.6				$ 80.1	44.6	80.1	109.6
Additional provisions									25.2	21.1	22.5
Payments									(18.3)	(53.7)	(39.3)
Changes in estimates									(10.8)	(2.1)	(8.8)
Translation adjustments									2.1	(0.8)	(3.9)
Balance at end of period	42.8				$ 44.6				42.8	$ 44.6	$ 80.1
In 2021	27.6								27.6
Beyond 2021	$ 27.6								$ 27.6
Work-Force Reductions | International | Forecast
Restructuring Reserve [Roll Forward]
In 2021												15.2
Beyond 2021												$ 15.2

Leases and commitments - Additi

Leases and commitments - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)
Lessee, Lease, Description [Line Items]
Optional extension or renewal term (up to)	5 years
Optional termination period	1 year
Standby letters of credit and surety bonds outstanding	$ 191
Deposits and collateralized assets	$ 8
Minimum
Lessee, Lease, Description [Line Items]
Initial lease terms	1 year
Maximum
Lessee, Lease, Description [Line Items]
Initial lease terms	8 years

Leases and commitments - Compon

Leases and commitments - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 42.3	$ 37.9
Finance lease cost
Amortization of right-of-use assets	1.7	1.6
Interest on lease liabilities	0.2	0.3
Total finance lease cost	1.9	1.9
Short-term lease costs	1.4	0.6
Variable lease cost	10.3	13.7
Sublease income	(12.1)	(0.7)
Total lease cost	$ 43.8	$ 53.4

Leases and commitments - Schedu

Leases and commitments - Schedule of Rental Expense and Income from Subleases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Leases [Abstract]
Rental expense, less income from subleases	$ 55.5
Income from subleases	$ 3.1

Leases and commitments - Supple

Leases and commitments - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Leases
Operating lease right-of-use assets	$ 79.3	$ 71.4	$ 0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent
Other accrued liabilities	$ 37.1	$ 34.1
Long-term operating lease liabilities	62.4	56
Total operating lease liabilities	$ 99.5	$ 90.1
Finance Leases
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	uis:OutsourcingAssetsNet	uis:OutsourcingAssetsNet
Outsourcing assets, net	$ 2.9	$ 4.6
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent	us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Current maturities of long-term debt	$ 2.4	$ 1.8
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations	us-gaap:LongTermDebtAndCapitalLeaseObligations
Long-term debt	$ 3.1	$ 3.5
Total finance lease liabilities	$ 5.5	$ 5.3
Weighted-Average Remaining Lease Term (in years)
Operating leases	2 years 3 months 18 days	3 years 4 months 24 days
Finance leases	2 years	3 years
Weighted-Average Discount Rate
Operating leases	6.40%	6.40%
Finance leases	5.20%	5.00%

Leases and commitments - Supp_2

Leases and commitments - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Cash payments for operating leases included in operating activities	$ 41.6	$ 42.1
Cash payments for finance leases included in financing activities	1.8	1.7
Cash payments for finance lease included in operating activities	0.2	0.3
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	40.9	17.4
Finance leases	$ 0	$ 1.5

Leases and commitments - Maturi

Leases and commitments - Maturities of Lease Liabilities, Topic 842 (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Finance Leases
2021	$ 2.6
2022	2
2023	0.7
2024	0.4
2025	0
Thereafter	0
Total lease payments	5.7
Less imputed interest	0.2
Total	5.5	$ 5.3
Operating Leases
2021	40.8
2022	33.6
2023	19.6
2024	9
2025	4.4
Thereafter	0.8
Total lease payments	108.2
Less imputed interest	8.7
Total	$ 99.5	$ 90.1

Leases and commitments - Receiv

Leases and commitments - Receivables Under Sales-Type Lease (Details) $ in Millions	Dec. 31, 2020USD ($)
Leases [Abstract]
2021	$ 14.9
2022	26.5
2023	16.4
2024	16.6
2025	10.1
Thereafter	3.2
Total	$ 87.7

Other (expense), net (Details)

Other (expense), net (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Jun. 30, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intercompany Foreign Currency Balance [Line Items]
Postretirement expense					$ (235.9)	$ (93.3)	$ (80.3)
Debt extinguishment charge			$ (28.5)	$ (20.1)	(28.5)	(20.1)	0
Foreign exchange losses					(36.2)	(10.4)	(5.9)
Environmental costs and other, net					(29)	(12.6)	9.1
Other (expense), net					(329.6)	(136.4)	(77.1)
Non-cash pension settlement charge		$ 142.1
Pension Plans | United States
Intercompany Foreign Currency Balance [Line Items]
Non-cash pension settlement charge	$ 142.1				142.1	$ 0	$ 0
Liquidation of Foreign Subsidiaries
Intercompany Foreign Currency Balance [Line Items]
Foreign exchange losses					$ (32.3)

Income taxes - Total Income (Lo

Income taxes - Total Income (Loss) From Continuing Operations Before Income Taxes and Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (loss) from continuing operations before income taxes
United States									$ (316.3)	$ (148.4)	$ (125.8)
Foreign									44.5	87.8	196.8
Income (loss) from continuing operations before income taxes	$ (155.9)	$ (7.2)	$ (66.8)	$ (41.9)	$ (32.8)	$ (15)	$ 7.9	$ (20.7)	(271.8)	(60.6)	71
Current
United States									7.3	(17.7)	(13.6)
Foreign									51.5	41	51.4
Total									58.8	23.3	37.8
Deferred
Foreign									(13.4)	4.4	8.2
Total provision for income taxes									$ 45.4	$ 27.7	$ 46

Income taxes - Reconciliation o

Income taxes - Reconciliation of the Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States statutory income tax provision (benefit)	$ (57.1)	$ (12.7)	$ 14.9
Income and losses for which no provision or benefit has been recognized	78.6	23.9	19.1
Foreign rate differential and other foreign tax expense	5.9	3.2	9.5
Income tax withholdings	16.8	17.6	19.3
Permanent items	0.8	(2.5)	(5)
Enacted rate changes	(4)	0.5	(2.3)
Change in uncertain tax positions	3.6	0.2	(1.2)
Change in valuation allowances due to changes in judgment	2.9	(2.3)	(5.9)
Income tax credits, U.S.	(2.1)	(0.2)	(2.4)
Total provision for income taxes	$ 45.4	$ 27.7	$ 46

Income taxes - Significant Port

Income taxes - Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Tax loss carryforwards	$ 795.2	$ 841.1
Postretirement benefits	253	434.4
Foreign tax credit carryforwards	201.3	211.5
Other tax credit carryforwards	29.2	30.3
Deferred revenue	31.1	42.8
Employee benefits and compensation	25.3	31.2
Purchased capitalized software	24.1	31.2
Depreciation	28.2	28.1
Warranty, bad debts and other reserves	10.5	5.9
Capitalized costs	8.1	7.1
Other	52	27.9
Total deferred tax assets, gross	1,458	1,691.5
Valuation allowance	(1,271.5)	(1,524.7)
Total deferred tax assets	186.5	166.8
Deferred tax liabilities
Capitalized research and development	47.4	44.7
Other	29.8	29
Total deferred tax liabilities	77.2	73.7
Net deferred tax assets	$ 109.3	$ 93.1

Income taxes - Additional Infor

Income taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax Credit Carryforward [Line Items]
Increase (decrease) in valuation allowance	$ (253,200,000)
Changes in deferred tax assets, net tax expense	2,900,000	$ (2,300,000)	$ (5,900,000)
Provision for income taxes that may become payable upon distribution of earnings of certain foreign subsidiaries	0
Unrecognized deferred income tax liability	26,600,000
Penalties and interest accrued related to income tax liabilities	3,900,000	$ 3,000,000
Reasonably possible decrease in amount of unrecognized tax benefits	2,300,000
Utilization of tax attributes, annual limitation	70,600,000
Utilization of tax attributes, cumulative limitation	346,100,000
Recognition of net income tax benefit
Tax Credit Carryforward [Line Items]
Increase (decrease) in valuation allowance	(189,000,000)
Expired net operating losses/tax credits
Tax Credit Carryforward [Line Items]
Increase (decrease) in valuation allowance	(28,900,000)
Translation adjustments
Tax Credit Carryforward [Line Items]
Increase (decrease) in valuation allowance	20,900,000
Other activity
Tax Credit Carryforward [Line Items]
Increase (decrease) in valuation allowance	$ (56,200,000)
Minimum
Tax Credit Carryforward [Line Items]
Expected change in ownership percentage	50.00%

Income taxes - Tax Loss Carryfo

Income taxes - Tax Loss Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
U.S. Federal	$ 317.6
State and local	200.1
Foreign	277.5
Total tax loss carryforwards	795.2	$ 841.1
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, set to expire	795.2
2021
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, set to expire	15.7
2022
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, set to expire	17.5
2023
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, set to expire	13.6
2024
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, set to expire	11.9
2025
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, set to expire	13.2
Thereafter
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards, set to expire	$ 723.3

Income taxes - Tax Credit Carry

Income taxes - Tax Credit Carryforwards (Details) $ in Millions	Dec. 31, 2020USD ($)
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	$ 230.5
2021
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	55.9
2022
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	38.1
2023
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	27
2024
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	22.5
2025
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	20.7
Thereafter
Tax Credit Carryforward [Line Items]
Tax credit carryforwards, set to expire	$ 66.3

Income taxes - Cash Paid for In

Income taxes - Cash Paid for Income Taxes, Net of Refunds (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Cash paid for income taxes, net of refunds	$ 24.7	$ 37.6	$ 39.1

Income taxes - Reconciliation_2

Income taxes - Reconciliation of Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 25.6	$ 18.9	$ 27.9
Additions based on tax positions related to the current year	8.5	11.1	2.6
Changes for tax positions of prior years	(0.7)	(0.6)	(6.1)
Reductions as a result of a lapse of applicable statute of limitations	(2.3)	(2.3)	(2.4)
Settlements	(1.8)	(1.1)	(1.5)
Changes due to foreign currency	1.6	(0.4)	(1.6)
Balance at December 31	$ 30.9	$ 25.6	$ 18.9

Earnings per common share - Com

Earnings per common share - Computation of Earnings (Loss) Per Common Share Attributable to Unisys Corporation (Detail) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic earnings (loss) per common share computation:
Net income (loss) from continuing operations attributable to Unisys Corporation									$ (317,700,000)	$ (92,200,000)	$ 21,600,000
Income from discontinued operations, net of tax	$ 1,600,000	$ 400,000	$ (2,100,000)	$ 1,068,500,000	$ 20,200,000	$ 16,000,000	$ 25,500,000	$ 13,300,000	1,068,400,000	75,000,000	53,900,000
Net income (loss) attributable to Unisys Corporation	$ (173,100,000)	$ (12,900,000)	$ (78,600,000)	$ 1,015,300,000	$ (10,800,000)	$ (13,200,000)	$ 26,200,000	$ (19,400,000)	$ 750,700,000	$ (17,200,000)	$ 75,500,000
Weighted average shares (in shares)									62,932	55,961	50,946
Basic earnings (loss) per share attributable to Unisys Corporation
Continuing operations (in dollars per share)	$ (2.77)	$ (0.21)	$ (1.21)	$ (0.85)	$ (0.50)	$ (0.50)	$ 0.01	$ (0.64)	$ (5.05)	$ (1.65)	$ 0.42
Discontinued operations (in dollars per share)	0.02	0.01	(0.04)	17.06	0.33	0.27	0.50	0.26	16.98	1.34	1.06
Total (in dollars per share)	(2.75)	(0.20)	(1.25)	16.21	(0.17)	(0.23)	0.51	(0.38)	$ 11.93	$ (0.31)	$ 1.48
Diluted earnings (loss) per common share computation:
Net income (loss) from continuing operations attributable to Unisys Corporation									$ (317,700,000)	$ (92,200,000)	$ 21,600,000
Add interest expense on convertible senior notes, net of tax of zero									0	0	0
Interest expense on convertible senior notes, tax									0	0	0
Net income (loss) from continuing operations attributable to Unisys Corporation for diluted earnings per share									(317,700,000)	(92,200,000)	21,600,000
Income from discontinued operations, net of tax									1,068,400,000	75,000,000	53,900,000
Net income (loss) attributable to Unisys Corporation for diluted earnings per share									$ 750,700,000	$ (17,200,000)	$ 75,500,000
Weighted average shares (in shares)									62,932	55,961	50,946
Plus incremental shares from assumed conversions:
Employee stock plans (in shares)									0	0	541
Convertible senior notes (in shares)									0	0	0
Adjusted weighted average shares (in shares)									62,932	55,961	51,487
Diluted earnings (loss) per common share attributable to Unisys Corporation
Continuing operations (in dollars per share)	(2.77)	(0.21)	(1.21)	(0.85)	(0.50)	(0.50)	0.01	(0.64)	$ (5.05)	$ (1.65)	$ 0.42
Discontinued operations (in dollars per share)	0.02	0.01	(0.04)	17.06	0.33	0.27	0.49	0.26	16.98	1.34	1.05
Total (in dollars per share)	$ (2.75)	$ (0.20)	$ (1.25)	$ 16.21	$ (0.17)	$ (0.23)	$ 0.50	$ (0.38)	$ 11.93	$ (0.31)	$ 1.47
Stock options and restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive weighted-average securities (in shares)									579	1,393	1,226
Common shares issuable upon conversion of the 5.50% convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive weighted-average securities (in shares)									3,425	16,578	21,868
Interest rate	5.50%								5.50%

Accounts receivable - Additiona

Accounts receivable - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Revenue recognized in excess of billings on services contracts or unbilled accounts receivable	$ 63.3	$ 60.8
Allowance for doubtful accounts	9.2	11.8
Provision for doubtful accounts reported in selling, general and administrative expenses, (income) expense	$ (0.3)	$ (1.6)	$ (5.1)

Contract assets and deferred _3

Contract assets and deferred revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract assets - current	$ 44.3	$ 38.4
Contract assets - long-term	20.7	21.6
Deferred revenue - current	(257.1)	(246.4)
Deferred revenue - long-term	(137.9)	(147)
Revenue recognized that was included in deferred revenue at the beginning of the period	$ 236.1	$ 270.1

Capitalized contract costs (Det

Capitalized contract costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Capitalized Contract Cost [Line Items]
Costs to fulfill a contract - amortization expense	$ 27.5	$ 24.2	$ 21.7
Costs to fulfill a contract	74.4	75.8
Deferred Commissions
Capitalized Contract Cost [Line Items]
Deferred commissions	8.7	9.1
Costs to fulfill a contract - amortization expense	$ 3.2	$ 3.1	$ 6.5

Financial instruments and con_3

Financial instruments and concentration of credit risks - Additional Information (Detail) - Foreign Exchange Forward Contract - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value Measurements Disclosure [Line Items]
Maturity period limit of foreign currency exchange instruments (in months)	3 months
Notional amount of foreign exchange forward contracts not designated as hedging instruments	$ 588.5	$ 437

Financial instruments and con_4

Financial instruments and concentration of credit risks - Fair Value of Foreign Exchange Forward Contracts by Balance Sheet Location (Details) - Foreign Exchange Forward Contract - Level 2 - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fair value	$ 0.4	$ 2
Prepaid expenses and other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Prepaid expenses and other current assets	1.4	2.1
Other accrued liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other accrued liabilities	$ 1	$ 0.1

Financial instruments and con_5

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Other (expense), net | Foreign Exchange Forward Contract
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Amount of gain (loss) recognized	$ 7.6	$ 1.7	$ (14.2)

Properties - Components of Prop

Properties - Components of Properties (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total properties	$ 727	$ 784
Land
Property, Plant and Equipment [Line Items]
Total properties	2.3	2.3
Buildings
Property, Plant and Equipment [Line Items]
Total properties	63.5	63.5
Machinery and office equipment
Property, Plant and Equipment [Line Items]
Total properties	466.7	521.5
Internal-use software
Property, Plant and Equipment [Line Items]
Total properties	171.2	161.8
Rental equipment
Property, Plant and Equipment [Line Items]
Total properties	$ 23.3	$ 34.9

Goodwill (Details)

Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment	$ 0
Goodwill [Line Items]
Goodwill	108,600,000	$ 110,400,000	$ 111,000,000
Services
Goodwill [Line Items]
Goodwill	10,300,000	$ 10,300,000	$ 10,900,000
BPO solutions | Services
Goodwill [Line Items]
Goodwill	$ 10,300,000

Goodwill - Changes in Carrying

Goodwill - Changes in Carrying Amount of Goodwill by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Balance at beginning of year	$ 110.4	$ 111
Translation adjustments	(1.8)	(0.6)
Balance at end of year	108.6	110.4
Services
Goodwill [Roll Forward]
Balance at beginning of year	10.3	10.9
Translation adjustments	0	(0.6)
Balance at end of year	10.3	10.3
Technology
Goodwill [Roll Forward]
Balance at beginning of year	100.1	100.1
Translation adjustments	(1.8)	0
Balance at end of year	$ 98.3	$ 100.1

Debt - Components of Long-term

Debt - Components of Long-term Debt (Details) - USD ($)	Dec. 31, 2020	Oct. 29, 2020	Apr. 15, 2020	Dec. 31, 2019	Aug. 06, 2019	Dec. 31, 2016
Debt Instrument [Line Items]
Finance leases	$ 5,500,000			$ 5,300,000
Other debt	63,900,000			59,600,000
Total	629,900,000			579,400,000
Less – current maturities	102,800,000			13,500,000
Total long-term debt	$ 527,100,000			565,900,000
Senior Notes | 6.875% senior secured notes due November 1, 2027
Debt Instrument [Line Items]
Interest rate	6.875%	6.875%
Face value	$ 485,000,000	$ 485,000,000
Unamortized discount and issuance costs	8,100,000
Long-term debt	$ 476,900,000			0
Senior Notes | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Interest rate	5.50%					5.50%
Face value	$ 84,200,000			84,200,000		$ 213,500,000
Unamortized discount and issuance costs	600,000			4,200,000
Long-term debt	$ 83,600,000			$ 80,000,000	$ 84,200,000
Senior Notes | 10.75% senior secured notes
Debt Instrument [Line Items]
Interest rate	10.75%		10.75%	10.75%
Face value				$ 440,000,000
Unamortized discount and issuance costs				5,500,000
Long-term debt	$ 0			$ 434,500,000

Debt - Estimated Fair Values of

Debt - Estimated Fair Values of Long-term Debt (Details) - Senior Notes - USD ($) $ in Millions	Dec. 31, 2020	Oct. 29, 2020	Apr. 15, 2020	Dec. 31, 2019	Dec. 31, 2016
6.875% senior secured notes due November 1, 2027
Debt Instrument [Line Items]
Interest rate	6.875%	6.875%
5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Interest rate	5.50%				5.50%
10.75% senior secured notes
Debt Instrument [Line Items]
Interest rate	10.75%		10.75%	10.75%
Estimated Fair Value | 6.875% senior secured notes due November 1, 2027
Debt Instrument [Line Items]
Long-term debt	$ 532.3			$ 0
Estimated Fair Value | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Long-term debt	169.8			115.8
Estimated Fair Value | 10.75% senior secured notes
Debt Instrument [Line Items]
Long-term debt	$ 0			$ 474.2

Debt - Schedule of Maturities o

Debt - Schedule of Maturities of Long-term Debt, Including Finance Leases (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Total
2021	$ 102.8
2022	18.2
2023	16.5
2024	9.8
2025	2.8
Thereafter	479.8
Total	629.9	$ 579.4
Long-Term Debt
2021	100.4
2022	16.2
2023	15.8
2024	9.4
2025	2.8
Thereafter	479.8
Long-term debt	624.4
Finance Leases
2021	2.4
2022	2
2023	0.7
2024	0.4
2025	0
Thereafter	0
Total finance lease liabilities	$ 5.5	$ 5.3

Debt - Cash Paid for Interest a

Debt - Cash Paid for Interest and Capitalized Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
Cash paid for interest	$ 32.9	$ 61.5	$ 59.5
Capitalized interest expense	$ 4.6	$ 6.6	$ 6

Debt - Additional Information (

Debt - Additional Information (Detail)	Nov. 25, 2020USD ($)	Oct. 29, 2020USD ($)	Apr. 15, 2020USD ($)	Mar. 31, 2021USD ($)shares	Jun. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Dec. 31, 2020USD ($)$ / shares	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)	Dec. 31, 2016USD ($)equity_instrument$ / sharesshares	Aug. 06, 2019USD ($)
Debt Instrument [Line Items]
Loss on debt extinguishment					$ 28,500,000	$ 20,100,000	$ 28,500,000	$ 20,100,000	$ 0
Proceeds from capped call transactions							0	7,200,000	$ 0
Installment Payment Agreement
Debt Instrument [Line Items]
Aggregate principal amount								$ 27,700,000
Interest rate								7.00%
Amount reported in current maturities of long-term debt							6,500,000
Software Licenses Financing Agreement
Debt Instrument [Line Items]
Aggregate principal amount								$ 19,300,000
Interest rate								5.47%
Amount reported in current maturities of long-term debt							3,600,000
Amended and Restated ABL Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity							145,000,000
Accordion feature increase limit							175,000,000
Borrowings outstanding							0
Availability under the facility, net of letters of credit issued							$ 112,900,000
Springing maturity, period prior to any date on which domestic pension contributions in an amount in excess of threshold are required to be paid							91 days
Springing maturity, date on which pension contributions to pension funds in the United States are required to be paid, threshold excess amount							$ 100,000,000
Springing maturity, conditions, minimum liquidity							130,000,000
Amended and Restated ABL Credit Facility | Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity							40,000,000
Letters of credit outstanding							5,700,000
Senior Notes | 2027 Notes
Debt Instrument [Line Items]
Aggregate principal amount		$ 485,000,000					$ 485,000,000
Interest rate		6.875%					6.875%
Aggregate principal amount of convertible debt outstanding							$ 476,900,000	$ 0
Senior Notes | 2027 Notes | Prior to November 1, 2023
Debt Instrument [Line Items]
Redemption price, percent of principal amount of notes redeemed		100.00%
Percent of notes with option to redeem		40.00%
Redemption price, percentage of principal amount		106.875%
Senior Notes | 2027 Notes | Change of Control
Debt Instrument [Line Items]
Redemption price, percentage of principal amount		101.00%
Senior Notes | 2022 Notes
Debt Instrument [Line Items]
Aggregate principal amount								$ 440,000,000
Interest rate			10.75%				10.75%	10.75%
Redemption price, percent of principal amount of notes redeemed			105.375%
Principal amount redeemed			$ 440,000,000
Redemption price paid			487,300,000
Call premium			23,650,000
Accrued interest			23,650,000
Loss on debt extinguishment			28,500,000
Premium			23,650,000
Write off of unamortized discount and fees related to issuance of the Notes			$ 4,800,000
Aggregate principal amount of convertible debt outstanding							$ 0	$ 434,500,000
Senior Notes | 2021 Notes
Debt Instrument [Line Items]
Aggregate principal amount							$ 84,200,000	$ 84,200,000		$ 213,500,000
Interest rate							5.50%			5.50%
Effective interest rate										9.50%
Conversion rate (in shares) | shares										0.1024249
Total amount of conversion (in shares) | equity_instrument										21,867,716
Conversion price (in dollars per share) | $ / shares							$ 12.75			$ 9.76
Cash settlement amount per $1,000 principal amount	$ 1,000
Aggregate shares of common stock issued from conversion of convertible securities (in shares) | shares								10,593,930
Payments for capped call transactions										$ 27,300,000
Conversion premium							60.00%			22.50%
Cash paid in exchange for outstanding debt								$ 59,400,000
Accrued and unpaid interest								3,100,000
Aggregate principal amount of outstanding convertible debt included in debt conversion								129,300,000
Aggregate principal amount of convertible debt outstanding							$ 83,600,000	80,000,000			$ 84,200,000
Proceeds from capped call transactions								$ 7,200,000
Number of shares of common stock covered by remaining capped call transactions (in shares) | shares								8,600,000
Charge recognized as a result of exchange								$ 20,100,000
Senior Notes | 2021 Notes | Forecast
Debt Instrument [Line Items]
Cash payment to note holders for debt conversion				$ 84,200,000
Aggregate shares of common stock issued from conversion of convertible securities (in shares) | shares				4,600,000
Amount of conversion, shares received upon exercise of capped call transactions (in shares) | shares				1,200,000
Amount of conversion, increase in outstanding common stock (in shares) | shares				3,400,000
Line of Credit | Amended and Restated ABL Credit Facility | 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							$ 14,500,000
Amount of aggregate default under other debt that would trigger event of default							$ 50,000,000

Debt - Schedule of Interest Exp

Debt - Schedule of Interest Expense (Details) - Senior Notes - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
2027 Notes
Debt Instrument [Line Items]
Contractual interest coupon	$ 5.7
Amortization of debt issuance costs	0.2
Total	5.9
2022 Notes
Debt Instrument [Line Items]
Contractual interest coupon	13.8	$ 47.3	$ 47.3
Amortization of debt issuance costs	0.7	2.4	2.4
Total	14.5	49.7	49.7
2021 Notes
Debt Instrument [Line Items]
Contractual interest coupon	4.6	8.9	11.8
Amortization of debt discount	3.1	5.5	6.6
Amortization of debt issuance costs	0.5	0.9	1.2
Total	$ 8.2	$ 15.3	$ 19.6

Other accrued liabilities (Deta

Other accrued liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities Disclosure [Abstract]
Payrolls and commissions	$ 95.9	$ 106.8
Income taxes	41.2	28.6
Cost reduction	40.7	47.5
Operating leases	37.1	34.1
Taxes other than income taxes	33	18.3
Accrued vacations	24.3	24.7
Postretirement	11.7	13.6
Accrued interest	8	11.8
Other	60.1	31.3
Total other accrued liabilities	$ 352	$ 316.7

Employee plans - Additional Inf

Employee plans - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2020USD ($)former_associate$ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)shares
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	8,100,000	8,100,000	8,100,000
Share-based compensation expense			$ 14,500,000	$ 13,200,000	$ 13,200,000
Grants of stock option awards (in shares) | shares			0	0	0
Stock option awards outstanding (in shares) | shares	300,000	300,000	300,000
Weighted-average exercise price of outstanding stock option awards (in dollars per share) | $ / shares	$ 22.02	$ 22.02	$ 22.02
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			$ 8,800,000	$ 8,200,000	$ 7,000,000
Deferred compensation liability	$ 12,700,000	$ 12,700,000	12,700,000	14,700,000
Non-cash pension settlement charge		142,100,000
International Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost recognized for contribution plans			16,200,000	19,300,000	21,300,000
Pension Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company in next fiscal year	$ 250,600,000	250,600,000	250,600,000
Pension Plans | U.S. Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Lump sum payments, number of former associates | former_associate	3,500
Lump -sum payments	$ 276,000,000
Non-cash pension settlement charge	142,100,000		142,100,000	0	0
Estimated cash contributions by the company in next fiscal year	200,000,000	200,000,000	200,000,000
Pension Plans | International Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash pension settlement charge			0	1,200,000	6,400,000
Estimated cash contributions by the company in next fiscal year	50,600,000	50,600,000	50,600,000
Other Postretirement Benefit Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated cash contributions by the company in next fiscal year	5,000,000	5,000,000	$ 5,000,000
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Certain investments valued using net asset value as practical expedient, redemption notice period			120 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 14,500,000	13,200,000	13,100,000
Aggregate weighted-average grant-date fair value of units granted			17,400,000	16,900,000	17,900,000
Total unrecognized compensation cost	$ 12,600,000	$ 12,600,000	$ 12,600,000
Unrecognized compensation cost, weighted-average recognition period			1 year 10 months 24 days
Aggregate weighted-average grant-date fair value of units vested			$ 13,000,000	14,900,000	10,400,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense			$ 0	$ 0	$ 100,000
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

Employee plans - Summary of Res

Employee plans - Summary of Restricted Stock Unit Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Weighted-Average Grant-Date Fair Value
Granted (in dollars per share)	$ 28.33	$ 16.58
Restricted Stock Units
Restricted Stock Units
Outstanding at beginning of period (in shares)	2,040
Granted (in shares)	752
Vested (in shares)	(940)
Forfeited and expired (in shares)	(126)
Outstanding at end of period (in shares)	1,726	2,040
Weighted-Average Grant-Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 14.17
Granted (in dollars per share)	22.48
Vested (in dollars per share)	13.80
Forfeited and expired (in dollars per share)	16.10
Outstanding at end of period (in dollars per share)	$ 17.87	$ 14.17

Employee plans - Weighted Avera

Employee plans - Weighted Average Assumptions for Restricted Stock Units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Weighted-average fair value of grant (in dollars per share)	$ 28.33	$ 16.58
Risk-free interest rate	1.35%	2.49%
Expected volatility	51.81%	47.91%
Expected life of restricted stock units in years	2 years 10 months 9 days	2 years 10 months 13 days
Expected dividend yield	0.00%	0.00%

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, 2020	Dec. 31, 2019	Dec. 31, 2018
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets	$ 187.5	$ 136.2	$ 147.6
Other accrued liabilities	(11.7)	(13.6)
Long-term postretirement liabilities	(1,286.1)	(1,960.2)
Pension Plans | U.S. Plans
Change in projected/accumulated benefit obligation
Benefit obligation at beginning of year	4,755.6	4,558
Service cost	0	0	0
Interest cost	162.5	197.5	186.6
Plan participants’ contributions	0	0
Plan curtailment	0	0
Plan settlement	(277.3)	0
Actuarial loss	253.9	357.7
Benefits paid	(349.4)	(357.6)
Foreign currency translation and other adjustments	0	0
Benefit obligation at end of year	4,545.3	4,755.6	4,558
Change in plan assets
Fair value of plan assets at beginning of year	3,334.2	3,112.8
Actual return on plan assets	347.2	505.2
Employer contribution	793.1	73.8
Plan participants’ contributions	0	0
Plan settlement	(277.3)	0
Benefits paid	(349.4)	(357.6)
Foreign currency translation adjustments	0	0
Fair value of plan assets at end of year	3,847.8	3,334.2	3,112.8
Funded status at end of year	(697.5)	(1,421.4)
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets	27.2	0
Other accrued liabilities	(6.1)	(6.8)
Long-term postretirement liabilities	(718.6)	(1,414.6)
Total funded status	(697.5)	(1,421.4)
Accumulated other comprehensive loss, net of tax
Net loss	2,510.4	2,672.7
Prior service credit	(32.3)	(34.8)
Accumulated benefit obligation	4,545.3	4,755.6
Pension Plans | International Plans
Change in projected/accumulated benefit obligation
Benefit obligation at beginning of year	3,143.8	2,829.5
Service cost	2.8	2.8	3.2
Interest cost	53.4	68.3	67.3
Plan participants’ contributions	1.1	1.3
Plan curtailment	(1.6)	(1.6)
Plan settlement	0	(3.5)
Actuarial loss	226.5	284.1
Benefits paid	(119)	(118.1)
Foreign currency translation and other adjustments	161	81
Benefit obligation at end of year	3,468	3,143.8	2,829.5
Change in plan assets
Fair value of plan assets at beginning of year	2,816.4	2,539.4
Actual return on plan assets	254.7	300
Employer contribution	33.1	30.1
Plan participants’ contributions	1.1	1.3
Plan settlement	0	(3.5)
Benefits paid	(119)	(118.1)
Foreign currency translation adjustments	143.1	67.2
Fair value of plan assets at end of year	3,129.4	2,816.4	2,539.4
Funded status at end of year	(338.6)	(327.4)
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets	160.3	135.9
Other accrued liabilities	(0.2)	(0.2)
Long-term postretirement liabilities	(498.7)	(463.1)
Total funded status	(338.6)	(327.4)
Accumulated other comprehensive loss, net of tax
Net loss	1,116.9	1,067.2
Prior service credit	(45.9)	(46.4)
Accumulated benefit obligation	3,360.4	3,035.3
Other Postretirement Benefit Plans
Change in projected/accumulated benefit obligation
Benefit obligation at beginning of year	95.7	96.2
Service cost	0.5	0.5	0.6
Interest cost	4.4	4.8	4.8
Plan participants’ contributions	2.3	2.7
Actuarial loss	(13.8)	1
Benefits paid	(8.8)	(8.9)
Foreign currency translation and other adjustments	(0.1)	(0.6)
Benefit obligation at end of year	80.2	95.7	96.2
Change in plan assets
Fair value of plan assets at beginning of year	6.9	7.8
Actual return on plan assets	(0.4)	(0.2)
Employer contribution	6	5.5
Plan participants’ contributions	2.3	2.7
Benefits paid	(8.8)	(8.9)
Fair value of plan assets at end of year	6	6.9	$ 7.8
Funded status at end of year	(74.2)	(88.8)
Amounts recognized in the consolidated balance sheets consist of:
Prepaid postretirement assets	0	0.3
Other accrued liabilities	(5.4)	(6.6)
Long-term postretirement liabilities	(68.8)	(82.5)
Total funded status	(74.2)	(88.8)
Accumulated other comprehensive loss, net of tax
Net loss	(3)	11.1
Prior service credit	$ (4.9)	$ (6.6)

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, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Accumulated benefit obligation	$ 6,060.7	$ 6,896.5
Fair value of plan assets	4,839.5	5,014.1
Projected benefit obligation	6,063	6,898.7
Fair value of plan assets	$ 4,839.5	$ 5,014.1

Employee plans - Components of

Employee plans - Components of Net Periodic Benefit Expense (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Settlement loss		$ 142.1
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost			$ 0	$ 0	$ 0
Interest cost			162.5	197.5	186.6
Expected return on plan assets			(208.6)	(218.2)	(230.6)
Amortization of prior service credit			(2.5)	(2.5)	(2.5)
Recognized net actuarial loss			135.5	116.6	125.1
Curtailment gain			0	0	0
Settlement loss	$ 142.1		142.1	0	0
Net periodic pension/benefit cost (income)			229	93.4	78.6
Pension Plans | International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost			2.8	2.8	3.2
Interest cost			53.4	68.3	67.3
Expected return on plan assets			(90.6)	(104.6)	(114.4)
Amortization of prior service credit			(2.5)	(2.5)	(3.7)
Recognized net actuarial loss			43.2	34.2	42.3
Curtailment gain			0	(0.1)	0
Settlement loss			0	1.2	6.4
Net periodic pension/benefit cost (income)			6.3	(0.7)	1.1
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost			0.5	0.5	0.6
Interest cost			4.4	4.8	4.8
Expected return on plan assets			(0.4)	(0.4)	(0.4)
Amortization of prior service credit			(1.6)	(1.7)	(1.6)
Recognized net actuarial loss			1	0.7	1
Net periodic pension/benefit cost (income)			$ 3.9	$ 3.9	$ 4.4

Employee plans - Schedule of We

Employee plans - Schedule of Weighted-Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.53%	4.50%	3.87%
Expected long-term rate of return on assets	6.50%	6.80%	6.80%
Weighted-average assumptions used to determine benefit obligations at December 31 were as follows:
Discount rate	2.85%	3.53%	4.50%
Pension Plans | International Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	1.82%	2.55%	2.24%
Expected long-term rate of return on assets	3.50%	4.18%	4.38%
Weighted-average assumptions used to determine benefit obligations at December 31 were as follows:
Discount rate	1.23%	1.82%	2.55%
Other Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.13%	5.67%	5.30%
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	2.21%	5.13%	5.67%

Employee plans - Company's Inve

Employee plans - Company's Investment Policy Targets and Ranges for Each Asset Category (Details) - Pension Plans	Dec. 31, 2020
U.S. Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	32.00%
U.S. Plans | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	53.00%
U.S. Plans | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	0.00%
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	15.00%
U.S. Plans | Minimum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	26.00%
U.S. Plans | Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	49.00%
U.S. Plans | Minimum | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	0.00%
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	5.00%
U.S. Plans | Maximum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	38.00%
U.S. Plans | Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	57.00%
U.S. Plans | Maximum | Real estate
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	0.00%
U.S. Plans | Maximum | Cash
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	5.00%
U.S. Plans | Maximum | Other
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	25.00%
International Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	19.00%
International Plans | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	61.00%
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	18.00%
International Plans | Minimum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	16.00%
International Plans | Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	54.00%
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	11.00%
International Plans | Maximum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	23.00%
International Plans | Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target allocation percentage of assets	67.00%
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	26.00%

Employee plans - Expected Futur

Employee plans - Expected Future Benefit Payments (Details) $ in Millions	Dec. 31, 2020USD ($)
Pension Plans | U.S. Plans
Expected Payments
2021	$ 352.8
2022	346.5
2023	339.6
2024	331.9
2025	323
2026 - 2030	1,453.2
Pension Plans | International Plans
Expected Payments
2021	114.8
2022	117.7
2023	121.1
2024	125
2025	126.9
2026 - 2030	677.3
Other Postretirement Benefit Plans
Expected Payments
2021	6.3
2022	6
2023	5.6
2024	5.3
2025	4.9
2026 - 2030	$ 19.9

Employee plans - Assumed Health

Employee plans - Assumed Health Care Cost Trend Rates (Details)	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Health care cost trend rate assumed for next year	5.40%	5.80%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	4.50%

Employee plans - Schedule of Pl

Employee plans - Schedule of Plan Assets at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 3,847.8	$ 3,334.2	$ 3,112.8
Pension Plans | U.S. Plans | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	3,403.4	2,931.5
Pension Plans | U.S. Plans | Fair Value | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	774.1	955.3
Pension Plans | U.S. Plans | Fair Value | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	640.6	578.8
Pension Plans | U.S. Plans | Fair Value | U.S. Govt. Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	388.5	436
Pension Plans | U.S. Plans | Fair Value | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	589.9	278.1
Pension Plans | U.S. Plans | Fair Value | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	689.9	433.6
Pension Plans | U.S. Plans | Fair Value | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	112.1	14
Pension Plans | U.S. Plans | Fair Value | Real Estate, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		186.5
Pension Plans | U.S. Plans | Fair Value | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	(67.3)	(103.5)
Pension Plans | U.S. Plans | Fair Value | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	233.4	135.5
Pension Plans | U.S. Plans | Fair Value | Cumulative futures contracts variation margin paid to (received from) brokers
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	(1.1)	8.2
Pension Plans | U.S. Plans | Fair Value | Cash
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	21.8	2
Pension Plans | U.S. Plans | Fair Value | Receivables
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	28.8	14.4
Pension Plans | U.S. Plans | Fair Value | Payables
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	(7.3)	(7.4)
Pension Plans | U.S. Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1,319	1,411.8
Pension Plans | U.S. Plans | Level 1 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	771.2	952.8
Pension Plans | U.S. Plans | Level 1 | U.S. Govt. Securities
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	388.5	436
Pension Plans | U.S. Plans | Level 1 | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	112.1	14
Pension Plans | U.S. Plans | Level 1 | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	5	(8.2)
Pension Plans | U.S. Plans | Level 1 | Cumulative futures contracts variation margin paid to (received from) brokers
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	(1.1)	8.2
Pension Plans | U.S. Plans | Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	21.8	2
Pension Plans | U.S. Plans | Level 1 | Receivables
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	28.8	14.4
Pension Plans | U.S. Plans | Level 1 | Payables
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	(7.3)	(7.4)
Pension Plans | U.S. Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	2,084.4	1,519.7
Pension Plans | U.S. Plans | Level 2 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	2.9	2.5
Pension Plans | U.S. Plans | Level 2 | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	640.6	578.8
Pension Plans | U.S. Plans | Level 2 | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	589.9	278.1
Pension Plans | U.S. Plans | Level 2 | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	689.9	433.6
Pension Plans | U.S. Plans | Level 2 | Real Estate, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		186.5
Pension Plans | U.S. Plans | Level 2 | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	(72.3)	(95.3)
Pension Plans | U.S. Plans | Level 2 | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	233.4	135.5
Pension Plans | U.S. Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Pension Plans | U.S. Plans | Level 3 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	444.4	402.7
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	121.7	86.3
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient | Other, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	104.2	127
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient | Private Real Estate
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	208	189
Pension Plans | U.S. Plans | Plan assets measured using NAV as a practical expedient | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	10.5	0.4
Pension Plans | International Plans
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	3,129.4	2,816.4	2,539.4
Pension Plans | International Plans | Fair Value
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1,552.9	1,412.3
Pension Plans | International Plans | Fair Value | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Pension Plans | International Plans | Fair Value | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	153.4	176.7
Pension Plans | International Plans | Fair Value | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	125.8	91
Pension Plans | International Plans | Fair Value | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	127.5	123.1
Pension Plans | International Plans | Fair Value | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	471.2	441
Pension Plans | International Plans | Fair Value | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	2	1
Pension Plans | International Plans | Fair Value | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	20.5	6.5
Pension Plans | International Plans | Fair Value | Other, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	381.4	372.8
Pension Plans | International Plans | Fair Value | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	178	189.2
Pension Plans | International Plans | Fair Value | Cash
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	111.7	18.1
Pension Plans | International Plans | Fair Value | Receivables
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	2.1	0.2
Pension Plans | International Plans | Fair Value | Payables
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	(20.7)	(7.3)
Pension Plans | International Plans | Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	93.1	11
Pension Plans | International Plans | Level 1 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Pension Plans | International Plans | Level 1 | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		0
Pension Plans | International Plans | Level 1 | Cash
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	111.7	18.1
Pension Plans | International Plans | Level 1 | Receivables
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	2.1	0.2
Pension Plans | International Plans | Level 1 | Payables
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	(20.7)	(7.3)
Pension Plans | International Plans | Level 2
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1,332.3	1,278.2
Pension Plans | International Plans | Level 2 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Pension Plans | International Plans | Level 2 | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	153.4	176.7
Pension Plans | International Plans | Level 2 | Other Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	125.8	91
Pension Plans | International Plans | Level 2 | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	471.2	441
Pension Plans | International Plans | Level 2 | Real Estate Investment Trusts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	2	1
Pension Plans | International Plans | Level 2 | Derivatives, excluding cumulative futures contracts variation margin (received) paid (from) to brokers
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	20.5	6.5
Pension Plans | International Plans | Level 2 | Other, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	381.4	372.8
Pension Plans | International Plans | Level 2 | Pooled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	178	189.2
Pension Plans | International Plans | Level 3
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	127.5	123.1
Pension Plans | International Plans | Level 3 | Common Stocks
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Pension Plans | International Plans | Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	127.5	123.1	123.7
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1,576.5	1,404.1
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient | Equity Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	429.9	406.9
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient | Debt Securities, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	1,067.4	941
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient | Other, Commingled Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	27.4	24.8
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient | Private Real Estate
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	51.8	31.4
Pension Plans | International Plans | Plan assets measured using NAV as a practical expedient | Private Equity
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	0	0
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	6	6.9	7.8
Other Postretirement Plans | U.S. Plans | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	6	6.9
Other Postretirement Plans | U.S. Plans | Level 3 | Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	$ 6	$ 6.9	$ 7.8

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, 2020	Dec. 31, 2019
Other Postretirement Plans
Change in plan assets
Fair value of plan assets at beginning of year	$ 6.9	$ 7.8
Fair value of plan assets at end of year	6	6.9
U.S. Plans | Other Postretirement Plans | Insurance Contracts
Change in plan assets
Fair value of plan assets at beginning of year	6.9
Fair value of plan assets at end of year	6	6.9
U.S. Plans | Other Postretirement Plans | Level 3 | Insurance Contracts
Change in plan assets
Fair value of plan assets at beginning of year	6.9	7.8
Realized gains (losses)	(0.4)	(0.3)
Purchases or acquisitions	0	0
Sales or dispositions	(0.5)	(0.6)
Currency and unrealized gains (losses) relating to instruments still held at December 31, 2020	0	0
Fair value of plan assets at end of year	6	6.9
U.S. Plans | Pension Plans
Change in plan assets
Fair value of plan assets at beginning of year	3,334.2	3,112.8
Fair value of plan assets at end of year	3,847.8	3,334.2
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
International Plans | Pension Plans
Change in plan assets
Fair value of plan assets at beginning of year	2,816.4	2,539.4
Fair value of plan assets at end of year	3,129.4	2,816.4
International Plans | Pension Plans | Level 3
Change in plan assets
Fair value of plan assets at beginning of year	123.1
Fair value of plan assets at end of year	127.5	123.1
International Plans | Pension Plans | Level 3 | Insurance Contracts
Change in plan assets
Fair value of plan assets at beginning of year	123.1	123.7
Realized gains (losses)	0	0
Purchases or acquisitions	4.1	6.4
Sales or dispositions	(11.5)	(12)
Currency and unrealized gains (losses) relating to instruments still held at December 31, 2020	11.8	5
Fair value of plan assets at end of year	$ 127.5	$ 123.1

Employee plans - Additional I_2

Employee plans - Additional Information About Plan Assets Valued Using Net Asset Value (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)fund	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Pension Plans | U.S. Plans
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 3,847.8	$ 3,334.2	$ 3,112.8
Unfunded Commitments	36.6	44.4
Pension Plans | U.S. Plans | Debt Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	$ 0	$ 0
Redemption Notice Period Range	45 days	45 days
Pension Plans | U.S. Plans | Other, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	$ 0	$ 0
Redemption Notice Period Range	5 days	5 days
Pension Plans | U.S. Plans | Private Real Estate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	$ 15.7	$ 44.4
Number of funds for which redemption has been requested | fund	1
Pension Plans | U.S. Plans | Private Equity
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	$ 20.9	0
Pension Plans | International Plans
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	3,129.4	2,816.4	$ 2,539.4
Unfunded Commitments	86.2	117.9
Pension Plans | International Plans | Equity Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0	0
Pension Plans | International Plans | Debt Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	86.2	117.9
Pension Plans | International Plans | Other, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0	0
Pension Plans | International Plans | Private Real Estate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0	0
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	444.4	402.7
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Equity Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	0	0
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Debt Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	121.7	86.3
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Other, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	104.2	127
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Private Real Estate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	208	189
Plan assets measured using NAV as a practical expedient | Pension Plans | U.S. Plans | Private Equity
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	10.5	0.4
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	1,576.5	1,404.1
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Equity Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	429.9	406.9
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Debt Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	1,067.4	941
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Other, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	27.4	24.8
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Private Real Estate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	51.8	31.4
Plan assets measured using NAV as a practical expedient | Pension Plans | International Plans | Private Equity
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 0	$ 0
Minimum | Pension Plans | U.S. Plans | Private Real Estate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period Range	60 days	60 days
Requested redemption, estimated period for full receipt	3 years
Maximum
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period Range	120 days
Maximum | Pension Plans | U.S. Plans | Private Real Estate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period Range	90 days	90 days
Requested redemption, estimated period for full receipt	4 years
Maximum | Pension Plans | International Plans | Equity Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period Range	2 days	2 days
Maximum | Pension Plans | International Plans | Debt Securities, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period Range	120 days	120 days
Maximum | Pension Plans | International Plans | Other, Commingled Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period Range	30 days	30 days
Maximum | Pension Plans | International Plans | Private Real Estate
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Redemption Notice Period Range	90 days	90 days

Litigation and contingencies -

Litigation and contingencies - Additional Information (Detail) - USD ($) $ in Millions	Nov. 23, 2020	Jun. 26, 2014	Dec. 31, 2020
Loss Contingencies [Line Items]
Amount related to unreserved tax-related matters, inclusive of interest (up to)			$ 81
Pharmaceutical Claims
Loss Contingencies [Line Items]
Loss contingency, damages sought value		$ 48
Loss contingency, settlement amount	$ 10.6

Stockholders' equity - Addition

Stockholders' equity - Additional Information (Details) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Common stock, shares authorized (in shares)	150,000,000	150,000,000
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)	18,700,000

Stockholders' equity - Accumula

Stockholders' equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ (1,228.3)	$ (1,299.6)	$ (1,326.5)
Reclassification pursuant to ASU No. 2018-02			0
Amounts reclassified from accumulated other comprehensive income	(340.3)	(140.6)	(157)
Ending Balance	(312.1)	(1,228.3)	(1,299.6)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(4,088.6)	(4,084.8)	(3,815.8)
Reclassification pursuant to ASU No. 2018-02			(208.7)
Other comprehensive income before reclassifications	489.4	136.8	96.7
Amounts reclassified from accumulated other comprehensive income	(340.3)	(140.6)	(157)
Current period other comprehensive income	149.1	(3.8)	(269)
Ending Balance	(3,939.5)	(4,088.6)	(4,084.8)
Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(872.9)	(896.7)	(817)
Reclassification pursuant to ASU No. 2018-02			0
Other comprehensive income before reclassifications	78.6	23.8	(79.7)
Amounts reclassified from accumulated other comprehensive income	(32.3)	0	0
Current period other comprehensive income	46.3	23.8	(79.7)
Ending Balance	(826.6)	(872.9)	(896.7)
Postretirement Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(3,215.7)	(3,188.1)	(2,998.8)
Reclassification pursuant to ASU No. 2018-02			(208.7)
Other comprehensive income before reclassifications	410.8	113	176.4
Amounts reclassified from accumulated other comprehensive income	(308)	(140.6)	(157)
Current period other comprehensive income	102.8	(27.6)	(189.3)
Ending Balance	$ (3,112.9)	$ (3,215.7)	$ (3,188.1)

Stockholders' equity - Amounts

Stockholders' equity - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other (expense), net	$ (329.6)	$ (136.4)	$ (77.1)
Total reclassifications for the period	(340.3)	(140.6)	(157)
Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total reclassifications for the period	(32.3)	0	0
Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of postretirement plan items, before tax	(345.8)	(144.9)	(162.7)
Income tax benefit	5.5	4.3	5.7
Total reclassifications for the period	(308)	(140.6)	(157)
Amortization of prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of postretirement plan items, before tax	5.9	5.9	7.1
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of postretirement plan items, before tax	(177.3)	(149.7)	(165.9)
Settlement loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of postretirement plan items, before tax	(142.1)	(1.1)	(3.9)
Adjustment for substantial completion of liquidation of foreign subsidiaries | Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other (expense), net	$ (32.3)	$ 0	$ 0

Stockholders' equity - Changes

Stockholders' equity - Changes in Common Stock and Treasury Stock (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	65.9	54.2	53.4
Debt exchange (in shares)		10.6
Stock-based compensation (in shares)	0.9	1.1	0.8
Ending Balance (in shares)	66.8	65.9	54.2
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	3.5	3.1	2.9
Debt exchange (in shares)		0
Stock-based compensation (in shares)	0.3	0.4	0.2
Ending Balance (in shares)	3.8	3.5	3.1

Segment Information - Additiona

Segment Information - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020USD ($)segment	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Segment Reporting [Abstract]
Number of business segments | segment	2
Segment Reporting Information [Line Items]
Profit included in operating income	$ 87	$ 137.9	$ 212.1
Technology
Segment Reporting Information [Line Items]
Profit included in operating income	142.6	159.3	224.3
Technology | Other Technology | Segment Reconciling Items
Segment Reporting Information [Line Items]
Profit included in operating income	$ 7.8	$ 5.7	$ 4.2

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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Revenue	$ 576.9	$ 495.2	$ 438.8	$ 515.4	$ 546.8	$ 552.1	$ 569.4	$ 554.5	$ 2,026.3	$ 2,222.8	$ 2,251.2
Services
Revenue from External Customer [Line Items]
Revenue									1,692.9	1,892.7	1,857.6
Technology
Revenue from External Customer [Line Items]
Revenue									333.4	330.1	393.6
Cloud & infrastructure services | Services
Revenue from External Customer [Line Items]
Revenue									1,178.1	1,287.2	1,225.4
Application services | Services
Revenue from External Customer [Line Items]
Revenue									350.2	370.9	381.7
BPO solutions | Services
Revenue from External Customer [Line Items]
Revenue									$ 164.6	$ 234.6	$ 250.5

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
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)									$ 87	$ 137.9	$ 212.1
Interest expense									(29.2)	(62.1)	(64)
Other (expense), net									(329.6)	(136.4)	(77.1)
Cost reduction charges	$ (46.9)	$ (13.2)	$ (7.9)	$ (27.5)	$ (23.3)	$ (0.2)	$ (2.6)	$ (2.6)	(95.5)	(28.7)	(19.7)
Income (loss) from continuing operations before income taxes	$ (155.9)	$ (7.2)	$ (66.8)	$ (41.9)	$ (32.8)	$ (15)	$ 7.9	$ (20.7)	(271.8)	(60.6)	71
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)									154.8	180.1	233.4
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Interest expense									(29.2)	(62.1)	(64)
Other (expense), net									(329.6)	(136.4)	(77.1)
Cost reduction charges									(63.2)	(28.7)	(19.7)
Corporate and eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)									(4.6)	(13.5)	(1.6)
Other (expenses), net
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost reduction charges									(32.3)	$ 0	$ 0
Other (expenses), net | Net foreign currency translation losses
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost reduction charges									$ 32.3

Segment information - Reconci_2

Segment information - Reconciliation of Total Business Segment Assets to Consolidated Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,707.9	$ 2,504	$ 2,457.6
Cash and cash equivalents	898.5	538.8	605
Deferred income taxes	136.2	114	109.3
Operating lease right-of-use assets	79.3	71.4	0
Prepaid postretirement assets	187.5	136.2	147.6
Assets of discontinued operations	0	243.2	181.9
Operating Segments
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,302.3	1,263.4	1,254.7
Corporate
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,405.6	1,240.6	1,202.9
Other corporate assets	$ 104.1	$ 137	$ 159.1

Segment information - Summary o

Segment information - Summary of Operations by Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 576.9	$ 495.2	$ 438.8	$ 515.4	$ 546.8	$ 552.1	$ 569.4	$ 554.5	$ 2,026.3	$ 2,222.8	$ 2,251.2
Operating income (loss)									87	137.9	212.1
Depreciation and amortization									161	147.4	164.1
Total assets	2,707.9				2,504				2,707.9	2,504	2,457.6
Capital expenditures									130.1	159.8	189.3
Intersegment
Segment Reporting Information [Line Items]
Revenue									(16.3)	(15.2)	(24.7)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)									154.8	180.1	233.4
Total assets	1,302.3				1,263.4				1,302.3	1,263.4	1,254.7
Corporate
Segment Reporting Information [Line Items]
Revenue									(16.3)	(15.2)	(24.7)
Operating income (loss)									(67.8)	(42.2)	(21.3)
Total assets	1,405.6				1,240.6				1,405.6	1,240.6	1,202.9
Capital expenditures									2.5	7.1	8
Services
Segment Reporting Information [Line Items]
Revenue									1,692.9	1,892.7	1,857.6
Operating income (loss)									12.2	20.8	9.1
Depreciation and amortization									70.9	91.9	97.2
Total assets	850.5				864.2				850.5	864.2	846.9
Capital expenditures									49.2	74	92.9
Services | Intersegment
Segment Reporting Information [Line Items]
Revenue									0	0	0
Services | Operating Segments
Segment Reporting Information [Line Items]
Revenue									1,692.9	1,892.7	1,857.6
Technology
Segment Reporting Information [Line Items]
Revenue									333.4	330.1	393.6
Operating income (loss)									142.6	159.3	224.3
Depreciation and amortization									90.1	55.5	66.9
Total assets	$ 451.8				$ 399.2				451.8	399.2	407.8
Capital expenditures									78.4	78.7	88.4
Technology | Intersegment
Segment Reporting Information [Line Items]
Revenue									16.3	15.2	24.7
Technology | Operating Segments
Segment Reporting Information [Line Items]
Revenue									$ 349.7	$ 345.3	$ 418.3

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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 576.9	$ 495.2	$ 438.8	$ 515.4	$ 546.8	$ 552.1	$ 569.4	$ 554.5	$ 2,026.3	$ 2,222.8	$ 2,251.2
Properties, net	110.5				116				110.5	116	111.9
Outsourcing assets, net	173.9				202.1				173.9	202.1	216.4
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									781.5	824	666.2
Properties, net	82				82.3				82	82.3	75.9
Outsourcing assets, net	93.1				99.5				93.1	99.5	97.6
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									228	334.3	360.7
Properties, net	9.2				10.5				9.2	10.5	5.3
Outsourcing assets, net	55.3				71.7				55.3	71.7	86.5
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
Outsourcing assets, net	19.3				21.5				19.3	21.5	21.7
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,016.8	1,064.5	1,224.3
Properties, net	19.3				23.2				19.3	23.2	30.7
Outsourcing assets, net	$ 6.2				$ 9.4				$ 6.2	$ 9.4	$ 10.6

Remaining performance obligat_2

Remaining performance obligations (Details) $ in Millions	Dec. 31, 2020USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligation	$ 850
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percent to be recognized as revenue	40.00%
Period over which remaining performance obligations are expected to be recognized as revenue	1 year

Subsequent events (Details)

Subsequent events (Details) $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Jan. 31, 2021USD ($)retiree	Dec. 31, 2020USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Subsequent Event [Line Items]
One-time, non-cash, pre-tax settlement charge				$ 142.1
Pension Plans | United States
Subsequent Event [Line Items]
One-time, non-cash, pre-tax settlement charge		$ 142.1			$ 142.1	$ 0	$ 0
Subsequent Event | Pension Plans | United States
Subsequent Event [Line Items]
Agreement with insurance company, group annuity contract purchase amount	$ 279
Agreement with insurance company, number of retirees | retiree	11,600
Subsequent Event | Pension Plans | United States | Forecast
Subsequent Event [Line Items]
One-time, non-cash, pre-tax settlement charge			$ 158

Quarterly financial informati_3

Quarterly financial information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 576.9	$ 495.2	$ 438.8	$ 515.4	$ 546.8	$ 552.1	$ 569.4	$ 554.5	$ 2,026.3	$ 2,222.8	$ 2,251.2
Gross profit	175.1	119.9	74.9	113.1	116.3	140	152.6	125.1	483	534
Income (loss) from continuing operations before income taxes	(155.9)	(7.2)	(66.8)	(41.9)	(32.8)	(15)	7.9	(20.7)	(271.8)	(60.6)	71
Income from discontinued operations, net of tax	1.6	0.4	(2.1)	1,068.5	20.2	16	25.5	13.3	1,068.4	75	53.9
Net income (loss) attributable to Unisys Corporation	$ (173.1)	$ (12.9)	$ (78.6)	$ 1,015.3	$ (10.8)	$ (13.2)	$ 26.2	$ (19.4)	$ 750.7	$ (17.2)	$ 75.5
Basic
Continuing operations (in dollars per share)	$ (2.77)	$ (0.21)	$ (1.21)	$ (0.85)	$ (0.50)	$ (0.50)	$ 0.01	$ (0.64)	$ (5.05)	$ (1.65)	$ 0.42
Discontinued Operations (in dollars per share)	0.02	0.01	(0.04)	17.06	0.33	0.27	0.50	0.26	16.98	1.34	1.06
Total (in dollars per share)	(2.75)	(0.20)	(1.25)	16.21	(0.17)	(0.23)	0.51	(0.38)	11.93	(0.31)	1.48
Diluted
Continuing operations (in dollars per share)	(2.77)	(0.21)	(1.21)	(0.85)	(0.50)	(0.50)	0.01	(0.64)	(5.05)	(1.65)	0.42
Discontinued operations (in dollars per share)	0.02	0.01	(0.04)	17.06	0.33	0.27	0.49	0.26	16.98	1.34	1.05
Total (in dollars per share)	$ (2.75)	$ (0.20)	$ (1.25)	$ 16.21	$ (0.17)	$ (0.23)	$ 0.50	$ (0.38)	$ 11.93	$ (0.31)	$ 1.47

Quarterly financial informati_4

Quarterly financial information (unaudited) - Additional Information (Details) - USD ($) $ in Millions	Mar. 13, 2020	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of U.S. Federal business										$ 1,162.9	$ 0	$ 0
Non-cash pension settlement charge		$ 142.1
Debt extinguishment charge				$ 28.5			$ 20.1			28.5	20.1	0
Restructuring charges (benefits)		$ 46.9	$ 13.2	$ 7.9	$ 27.5	$ 23.3	$ 0.2	$ 2.6	$ 2.6	$ 95.5	$ 28.7	$ 19.7
U.S. Federal Business | Discontinued Operation, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of U.S. Federal business	$ 1,200

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Credit Losses - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for credit losses (deducted from accounts receivable):
Balance at Beginning of Period	$ 11.8	$ 13.7	$ 22
Additions Charged to Costs and Expenses	(0.3)	(1.6)	(5.1)
Deductions	(2.3)	(0.3)	(3.2)
Balance at End of Period	$ 9.2	$ 11.8	$ 13.7