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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Income Tax Disclosure [Abstract] |  |  |
Effective tax rate |  | 64.10% | (2.70%)
U.S. federal statutory rate |  | 35.00% | 35.00%
Effective tax rate, excluding tax benefit realized from sale of regulatory asset |  |  | 10.50%
Income tax benefit realized from sale of regulatory assets | $ 35.7 |  | $ 35.7
Deferred tax asset, remaining amortization period |  | 32 years |

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