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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 19, 2017 | Apr. 01, 2017 | Dec. 31, 2017
Scenario, Forecast | Series A Preferred Stock |  |  |
Subsequent Event [Line Items] |  |  |
Anticipated series A preferred stock dividends paid and declared |  |  | $ 3.0
Subsequent Event | Common Class A |  |  |
Subsequent Event [Line Items] |  |  |
Class A common stock dividends declared (in dollars per share) | $ 0.3625 |  |
Subsequent Event | Series A Preferred Stock |  |  |
Subsequent Event [Line Items] |  |  |
Series A preferred stock dividend (in dollars per share) | 0.72917 |  |
Subsequent Event | Scenario, Forecast | Series A Preferred Stock |  |  |
Subsequent Event [Line Items] |  |  |
Series A preferred stock dividend (in dollars per share) | 1.85 |  |
Series A preferred stock dividends declared (in dollars per share) | $ 1.85 |  |
National Gas & Electric, LLC | Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Payments to Acquire Residential Customer Equivalents |  | $ 2.2 |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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