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Net Income Per Share Net Income Per Share (Schedule of Securities Excluded from Net Income Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Options excluded from diluted net income per share	375,000	382,500	375,000	382,500
Restricted Stock or Unit Expense			$ 0.1	$ 0.2
Exercise price of excluded options				$ 3.90
Minimum [Member]
Exercise price of excluded options	$ 3.90	$ 3.90	$ 3.90
Maximum [Member]
Exercise price of excluded options	$ 5.62	$ 5.62	$ 5.62	$ 5.62

X

- Definition

Exercise price of the option.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Footnote 5

+ Details

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Namespace Prefix:	invest_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Options with exercise price greater than market price

+ References

No definition available.

+ Details

Name:	leu_OptionsWithExercisePriceGreaterThanMarketPrice
Namespace Prefix:	leu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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