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Accounts Receivable (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Utility Customer Receivables $ 7.8 $ 129.3  
DOE pro-rata share of Cooperative Agreement funding 0.4 20.1  
Contract Services Billed Revenue 16.5 15.7  
Contract Services Unbilled Revenue 18.5 1.9  
Contract Services Customer Receivables 35.0 17.6  
Accounts Receivable, Gross, Current 43.2 167.0  
Allowance for Doubtful Accounts Receivable 13.5 4.0  
Accounts Receivable, Net 29.7 163.0  
Government [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for Doubtful Accounts Receivable 55.3 55.0  
Accounts Receivable, Gross, Noncurrent 76.5 80.8 38.0
Accounts Receivable, Net, Noncurrent $ 21.2 $ 25.8