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Pension and Postretirement Health and Life Benefits (Narrative) (Details) (Scenario, Forecast [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2015
Scenario, Forecast [Member]
Expected defined benefit plan contributions for next fiscal year for non-qualified plans	$ 9.7leu_Expecteddefinedbenefitplancontributionsfornextfiscalyearfornonqualifiedplans / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition

Expected defined benefit plan contributions for next fiscal year for non-qualified plans

+ References

No definition available.

+ Details

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