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Segment Reporting - Narrative (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) supplier customer | Jun. 30, 2014 USD ($) supplier customer | Jun. 30, 2015 USD ($) supplier customer | Jun. 30, 2014 USD ($) supplier customer
Segment Reporting [Abstract] |  |  |  |
Asset optimization revenue | $ | $ 23.0 | $ 46.7 | $ 93.0 | $ 179.6
Asset optimization cost of revenues | $ | $ 23.1 | $ 46.5 | $ 91.1 | $ 177.8
Customer | Sales Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant customers | customer | 1 | 4 | 1 | 1
Customer | Retail Natural Gas | Sales Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant customers | customer | 0 | 0 | 0 | 0
Customer | Retail Electricity | Sales Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant customers | customer | 0 | 0 | 0 | 0
Supplier | Cost of Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant suppliers | 0 | 0 | 0 | 0
Supplier | Retail Natural Gas | Cost of Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant suppliers | 3 | 3 | 1 | 2
Supplier | Retail Electricity | Cost of Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant suppliers | 2 | 1 | 3 | 1

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