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Summary of Significant Accounting Policies Accounting Records (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Regulatory Assets, Current | $ 40.8 | $ 121.8
Regulatory Assets, Noncurrent | 283.0 | 404.8
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | (1.5) |
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 | 177.2 | 232.6
Regulatory Asset [Member] |  |
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 10.4 |
Pension Plans, Defined Benefit [Member] | Defined Benefit Plans Income Loss [Member] |  |
Components of Benefit Obligation Regulatory Asset | 172.4 | 199.9
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 12.5 |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Defined Benefit Plans Income Loss [Member] |  |
Components of Benefit Obligation Regulatory Asset | 33.6 | 32.7
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | 4.0 |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Prior Service Cost [Member] |  |
Components of Benefit Obligation Regulatory Asset | (28.8) | $ 0.0
Components of Net Periodic Benefit Costs to be Recognized in Next Fiscal Year | $ (6.1) |

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- Definition Carrying amount as of the balance sheet date of capitalized storm costs of a regulated entity that are expected to be recoverable through rate adjustments within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77907324&loc=d3e43603-110378 + Details
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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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