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Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Utility Customer Receivables	$ 129.3	$ 118.3
DOE pro-rata share of RD&D program funding	20.1	4.4
Contract Services Billed Revenue	15.7	12.6
Contract Services Unbilled Revenue	1.9	1.6
Contract Services Customer Receivables	17.6	14.2
Accounts Receivable, Gross, Current	167.0	136.9
Allowance for Doubtful Accounts Receivable	4.0	2.1
Accounts Receivable, Net, Current	163.0	134.8
Accounts Receivable, Gross, Noncurrent		38.0
Government [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Doubtful Accounts Receivable	55.0	12.2
Accounts Receivable, Gross, Noncurrent	80.8	38.0
Accounts Receivable, Net, Noncurrent	$ 25.8	$ 25.8

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Amounts 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.

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Contract Services Billed Revenue

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Contract Services Unbilled Revenue

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RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable

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