| **Commitments and Contingencies Additional information (Details) - USD ($) $ in Millions** | Jun. 30, 2016 | Dec. 31, 2015 |
|--------------------------------------------------------------------------------------------|---------------|---------------|
| **Loss Contingencies [Line Items]**                                                        |          |          |
| Accrued Environmental Liabilities                                                          | $ 4.0         | $ 4.1         |
| Gas Marketing Segment [Member]                                                             |          |          |
| **Loss Contingencies [Line Items]**                                                        |          |          |
| Allowance for Doubtful Accounts Receivable                                                 | $ 0.9         |          |

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| - Definition
Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.
+ References
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| - Definition
For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.
+ References
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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.
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