Approximate Number of Plan Participants

No definition available.

Name:	leu_ApproximateNumberofPlanParticipants
Namespace Prefix:	leu_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Defined Benefit Plan, Pension Plan Assets Transferred

+ References

No definition available.

+ Details

Name:	leu_DefinedBenefitPlanPensionPlanAssetsTransferred
Namespace Prefix:	leu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Defined Benefit Plan, Pension Plan Obligations Transferred

+ References

No definition available.

+ Details

Name:	leu_DefinedBenefitPlanPensionPlanObligationsTransferred
Namespace Prefix:	leu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Income (Loss) Related to Pension Settlement

+ References

No definition available.

+ Details

Name:	leu_IncomeLossRelatedToPensionSettlement
Namespace Prefix:	leu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Portion of Defined Benefit Plan, Benefit Obligation related to Remeasurement

+ References

No definition available.

+ Details

Name:	leu_PortionOfDefinedBenefitPlanBenefitObligationRelatedToRemeasurement
Namespace Prefix:	leu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanActuarialGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanBenefitObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-18

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)(7)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(7)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-6

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A

+ Details

Name:	us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_RetirementPlanTaxStatusAxis=us-gaap_QualifiedPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTaxStatusAxis=us-gaap_NonqualifiedPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Pension and Postretirement Health and Life Benefits (Narrative) (Details) $ in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2023 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	May 28, 2024 USD ($)	Oct. 12, 2023 USD ($)	Dec. 31, 2022 USD ($)
Defined Contribution Plan, Cost				$ 3.1	$ 2.6	$ 2.3
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement				$ (2.9)	17.3	24.6
Portion of Defined Benefit Plan, Benefit Obligation related to Remeasurement										$ 30.6
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment		$ 16.8	$ 0.9
Defined Benefit Plan, Pension Plan Obligation Transferred								$ 234.0	$ 186.5
Defined Benefit Plan, Pension Plan Assets Transferred							$ 15.4	$ 224.0	$ 171.4
Income (Loss) Related to Pension Settlement	$ 28.6
Pension Plan, Defined Benefit [Member]
Approximate Number of Plan Participants				300
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement				$ 0.9	(21.9)
Defined Benefit Plan, Benefit Obligation	308.2			31.0	30.6	308.2				$ 527.3
Pension Plan, Defined Benefit [Member] \| Qualified Plan [Member]
Expected defined benefit plan contributions for next fiscal year for qualified plans				0.0
Pension Plan, Defined Benefit [Member] \| Nonqualified Plan [Member]
Expected defined benefit plan contributions for next fiscal year for qualified plans				1.3
Other Postretirement Benefits Plan [Member]
Expected defined benefit plan contributions for next fiscal year for qualified plans				9.2
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement				2.5	0.0
Defined Benefit Plan, Benefit Obligation	$ 91.3			$ 81.4	$ 84.1	$ 91.3