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Segment Reporting - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) customer supplier | Sep. 30, 2014 USD ($) customer supplier | Sep. 30, 2015 USD ($) customer supplier | Sep. 30, 2014 USD ($) customer supplier
Segment Reporting [Abstract] |  |  |  |
Asset optimization revenue | $ | $ 27.7 | $ 45.9 | $ 120.7 | $ 225.4
Asset optimization cost of revenues | $ | $ 28.2 | $ 46.0 | $ 119.4 | $ 223.7
Customer | Sales Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant customers | 1 | 4 | 1 | 1
Customer | Retail Natural Gas | Sales Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant customers | 0 | 0 | 0 | 0
Customer | Retail Electricity | Sales Revenue |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant customers | 0 | 0 | 0 | 0
Supplier | Cost of Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant suppliers | supplier | 0 | 0 | 0 | 0
Supplier | Retail Natural Gas | Cost of Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant suppliers | supplier | 1 | 2 | 1 | 1
Supplier | Retail Electricity | Cost of Revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of significant suppliers | supplier | 5 | 1 | 4 | 1

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