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

Pension plan assets transferred for annuitization

+ References

No definition available.

+ Details

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

- Definition

Pension plan obligations transferred for annuitization

+ References

No definition available.

+ Details

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

- Definition

Amount of increase (decrease) in accumulated benefit obligation from change in existing term of defined benefit plan or initiation of new defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (r)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

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

- 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

+ Details

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

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 18
-URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921

+ Details

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

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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

- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

Name:	us-gaap_GainLossRelatedToLitigationSettlement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)
Gain (loss) related to litigation settlement		$ 43.5	$ 32.6
Defined Contribution Plan, Cost	$ 2.1	2.0
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement	$ (7.8)	50.5	(7.2)
Pension plan assets transferred for annuitization			30.4
Pension plan obligations transferred for annuitization			$ 30.4
Pension Plan, Defined Benefit [Member]
Approximate Number of Plan Participants	3,500
Gain (loss) related to litigation settlement		33.8
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment				$ (1.3)
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement	$ (138.0)	(28.7)
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	$ 0.4
Other Postretirement Benefits Plan [Member]
Approximate Number of Plan Participants	2,900
Gain (loss) related to litigation settlement		9.7
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment					$ (10.0)	$ (3.6)	$ (6.8)
Expected defined benefit plan contributions for next fiscal year for qualified plans	$ 7.3
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement	$ (27.0)	$ (2.3)