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Summary of Significant Accounting Policies Regulated Operations (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Fuel clause under recoveries | $ 0.0 | $ 51.3
Fuel clause over recoveries | 1.7 | 0.0
Regulatory Assets, Current | 40.8 | 121.8
Regulatory Assets, Noncurrent | 283.0 | 404.8
Regulatory Liability, Current | 3.9 | 12.3
Regulatory Liability, Noncurrent | 1,283.4 | 299.7
Other Regulatory Liabilities [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Current | 2.2 | 12.3
Regulatory Liability, Noncurrent | 7.2 | 1.4
Income taxes recoverable from customers, net [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Noncurrent | 955.5 | 0.0
Accrued removal obligations [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Noncurrent | 288.4 | 262.8
Pension tracker [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Liability, Noncurrent | 32.3 | 35.5
Oklahoma demand program rider under recovery [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 31.6 | 51.0
SPP cost tracker under recovery [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 7.7 | 10.0
Other Regulatory Assets [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Current | 1.5 | 9.5
Regulatory Assets, Noncurrent | 18.5 | 17.6
Benefit obligations regulatory asset [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Noncurrent | 177.2 | 232.6
Income taxes recoverable from customers, net [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Noncurrent | 0.0 | 62.3
Smart Grid [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Noncurrent | 32.8 | 43.2
Deferred storm expenses [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Noncurrent | 42.2 | 35.7
Unamortized loss on reacquired debt [Member] |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |
Regulatory Assets, Noncurrent | $ 12.3 | $ 13.4

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- Definition Current regulatory liabilities generally represent obligations to make refunds to customers for various reasons including overpayment. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of capitalized fuel 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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