Accounts Receivable (Table) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Accounts Receivable
Utility Trade Receivables	$ 39.1	$ 249.1
Uranium Loaned To Customers	41.2
Utility Unbilled Revenue	0.3	0.4
Utility Customer Receivables	80.6	249.5
Contract Services Billed Revenue	17.8	34.8
Contract Services Unbilled Revenue	35.6	24.3
Contract Services Customer Receivables	53.4	59.1
Accounts Receivable, Net	$ 134.0	$ 308.6

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Subparagraph a(1)
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 4
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3-4)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant