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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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- Definition

Asset Optimization, Cost of Revenues

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- Definition

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