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Segment Reporting - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) supplier | Dec. 31, 2015 USD ($) supplier customer | Dec. 31, 2014 USD ($) supplier customer
Segment Reporting [Abstract] |  |  |
Asset optimization revenue | $ | $ 133.0 | $ 154.1 | $ 284.6
Cost of revenues | $ | $ 133.6 | $ 152.6 | $ 282.3
Customer | Retail Natural Gas |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of significant suppliers | supplier |  | 1 | 1
Customer | Retail Natural Gas | Sales Revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of significant customers | customer |  | 1 | 1
Customer | Retail Electricity |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of significant suppliers | supplier | 2 | 1 | 1

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- Definition Asset Optimization Revenue, Gross + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Cost of Other Sales Revenue + References No definition available. + Details
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- Definition Number of Significant Customers + References No definition available. + Details
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- Definition Number of Significant Suppliers + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Period Type: |

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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |