XML 124 R105.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Employee plans - Additional Information About Plan Assets Valued Using Net Asset Value (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) fund | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Pension Plans | U.S. Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | $ 1,817.9 | $ 2,440.1 | $ 3,139.3
Unfunded Commitments | 23.3 | 28.4 |
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 | $ 0.0 |
Redemption Notice Period Range |  | 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 | $ 0.0 |
Pension Plans | U.S. Plans | Private Real Estate |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | $ 0.0 | 0.0 |
Number of funds for which redemption has been requested | fund | 3 |  |
Pension Plans | U.S. Plans | Private Equity |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | $ 23.3 | 28.4 |
Pension Plans | International Plans |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Fair Value | 1,486.2 | 1,444.3 | $ 2,431.6
Unfunded Commitments | 42.1 | 73.7 |
Pension Plans | International Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | 42.1 | 73.7 |
Pension Plans | International Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Unfunded Commitments | $ 0.0 | $ 0.0 |
Redemption Notice Period Range | 10 days | 10 days |
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 | $ 435.7 | $ 494.2 |
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 | 102.3 | 65.0 |
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 | 96.8 | 147.4 |
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 | 188.9 | 238.9 |
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 | 47.7 | 42.9 |
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 | 539.5 | 1,033.2 |
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 | 191.4 | 788.8 |
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 | $ 348.1 | 244.4 |
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 |  |  |
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 |  |  |
Minimum | Pension Plans | U.S. Plans | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 15 days |  |
Minimum | Pension Plans | U.S. Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 5 days | 5 days |
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 | Debt Securities, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 45 days |  |
Maximum | Pension Plans | U.S. Plans | Other, Commingled Funds |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] |  |  |
Redemption Notice Period Range | 90 days | 90 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 | 5 years |  |
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 |

X
- Definition Fair Value, Investments, Entities That Calculate Net Asset Value Per Share, Investment Redemption, Estimated Period For Full Receipt + References No definition available. + Details
Name: | uis_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareInvestmentRedemptionEstimatedPeriodForFullReceipt
Namespace Prefix: | uis_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair Value, Investments, Entities That Calculate Net Asset Value Per Share, Investment Redemption, Requested Redemption, Number of Funds + References No definition available. + Details
Name: | uis_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareInvestmentRedemptionRequestedRedemptionNumberofFunds
Namespace Prefix: | uis_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Notice period the entity is required to deliver before it can redeem an investment calculated using net asset value per share, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, investments calculated by per unit, per membership interest, other equity or ownership interest and alternative investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A + Details
Name: | us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareInvestmentRedemptionNoticePeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6A + Details
Name: | us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareUnfundedCommittments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=uis_DebtSecuritiesCommingledFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=uis_OtherSecuritiesCommingledFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=uis_PrivateRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |