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Nature of Regulation - Central Hudson (Details) - PSC - Central Hudson | Jul. 01, 2015 | Jun. 30, 2015 | Jul. 01, 2010
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Public Utilities, General Disclosures [Line Items] |  |  |
ROE (percent) | 9.00% |  | 10.00%
Capital structure of common equity (percent) | 48.00% |  | 48.00%
Approved return on equity and capital structure, term | 3 years |  | 3 years
Approved return on equity and capital structure, extension period |  |  | 2 years
Equally shared earnings |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Earnings in excess of (basis points) | 0.50% | 0.50% |
Primarily customer earnings |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Earnings in excess of (basis points) | 1.00% |  |
Split earnings |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Earnings in excess of (basis points) |  | 0.50% |
Company portion of earnings (percent) |  | 10.00% |
Customer portion of earnings (percent) |  | 90.00% |

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