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v3.3.1.900

Summary of Significant Accounting Policies Accounting Records (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Regulatory Assets, Noncurrent | $ 402.2 | $ 410.4
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | (7.4) |
Deferred Storm and Property Reserve Deficiency, Current | 2.7 |
Smart Grid Project [Member] |  |
Smart Grid Costs to be Recovered | 6.9 |
Benefit Obligations [Member] |  |
Regulatory Assets, Noncurrent | 242.2 | 261.1
Regulatory Asset [Member] |  |
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 21.2 |
Pension Plans, Defined Benefit [Member] | Defined Benefit Plans Income Loss [Member] |  |
Components of Benefit Obligation Regulatory Asset | 214.1 | 196.7
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 13.1 |
Pension Plans, Defined Benefit [Member] | Prior Service Cost [Member] |  |
Components of Benefit Obligation Regulatory Asset | 0.0 | 0.6
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 0.0 |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Defined Benefit Plans Income Loss [Member] |  |
Components of Benefit Obligation Regulatory Asset | 34.2 | 83.6
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 2.0 |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Prior Service Cost [Member] |  |
Components of Benefit Obligation Regulatory Asset | (6.1) | $ (19.8)
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | $ 6.1 |

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