XML 86 R67.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Income taxes - Valuation Allowance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Valuation allowance, at beginning of year | $ (1,110.5) | $ (1,226.2) | $ (1,271.5)
Increase (decrease) in valuation allowance | (2.1) |  |
Valuation allowance, at end of year | (1,150.1) | (1,110.5) | (1,226.2)
Change in valuation allowances | 2.1 | (9.8) | (0.8)
Actuarial pension adjustments |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Increase (decrease) in valuation allowance | 84.5 | 70.7 | 99.5
Expired net operating losses/tax credits |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Increase (decrease) in valuation allowance | 42.9 | 52.3 | 50.0
Foreign exchange |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Increase (decrease) in valuation allowance | (6.8) | 14.8 | 18.4
Recognition of net income tax benefit |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Increase (decrease) in valuation allowance | (125.9) | (43.9) | (102.1)
Other |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Increase (decrease) in valuation allowance | (34.3) | 21.8 | (20.5)
US Pension Activity |  |  |
Movement In Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |  |
Change in valuation allowances | $ (95.9) | $ (11.3) | $ (84.9)

X
- Definition Movement In Deferred Tax Assets, Valuation Allowance + References No definition available. + Details
Name: | uis_MovementInDeferredTaxAssetsValuationAllowanceRollForward
Namespace Prefix: | uis_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
Name: | us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=uis_DeferredTaxAssetActuarialPensionAdjustementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=uis_DeferredTaxAssetOperatingLossCarryforwardAndTaxCreditCarryforwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=uis_DeferredTaxAssetTranslationAdjustmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=uis_DeferredTaxAssetRecognitionOfNetIncomeTaxBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=uis_DeferredTaxAssetOtherActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=uis_USPensionActivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |