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Regulated Operations (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Fuel clause over recoveries |  | $ 49.9 | $ 1.7
Current Regulatory Assets |  | 31.6 | 40.8
Non-Current Regulatory Assets |  | 275.6 | 283.0
Current Regulatory Liabilities |  | 52.0 | 3.9
Non-Current Regulatory Liabilities |  | 1,292.7 | 1,283.4
Other (B) |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Liabilities | [1] | 2.1 | 2.2
Non-Current Regulatory Liabilities |  | 7.3 | 7.2
Income taxes recoverable from customers, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 951.3 | 955.5
Accrued removal obligations, net |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 295.7 | 288.4
Pension tracker |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Liabilities |  | 38.4 | 32.3
Oklahoma demand program rider under recovery (A) |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 23.9 | 31.6
SPP cost tracker under recovery (A) |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 6.9 | 7.7
Benefit obligations regulatory asset |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 174.6 | 177.2
Deferred storm expenses |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 39.7 | 42.2
Smart Grid |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 31.0 | 32.8
Unamortized loss on reacquired debt |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Non-Current Regulatory Assets |  | 12.1 | 12.3
Other Regulatory Asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Current Regulatory Assets | [2] | 0.8 | 1.5
Non-Current Regulatory Assets |  | $ 18.2 | $ 18.5
[1] | Included in Other Current Liabilities on the Condensed Consolidated Balance Sheets.
[2] | Included in Other Current Assets on the Condensed Consolidated Balance Sheets.

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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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