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Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2014

Accounts Receivable, Net, Current [Abstract]

Schedule of Accounts Receivable

	March 31, 2014				December 31, 2013
	(millions)
Accounts Receivable:
Utility customers	$	6.2			$	129.3
DOE cost share of Cooperative Agreement funding	17.5				20.1
Contract services, primarily DOE:
Billed revenue	16.2				15.7
Unbilled revenue	2.7				1.9
Contract services, primarily DOE	18.9				17.6
Accounts receivable, gross	42.6				167.0
Less: valuation allowances and allowances for doubtful accounts	4.6				4.0
Accounts receivable, net	$	38.0			$	163.0
DOE Receivables included in Other Long-Term Assets:
DOE long-term receivables, gross	$	80.8			$	80.8
Less: valuation allowances and allowances for doubtful accounts	55.0				55.0
DOE long-term receivables, net	$	25.8			$	25.8

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- Definition

Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.

+ References

Reference 1: 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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3, 4

-Article 5

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