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Summary of Significant Accounting Policies Regulated Operations (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Fuel clause under recoveries |  | $ 0.0 | $ 39.5
Fuel clause over recoveries |  | 28.6 | 4.8
Regulatory Assets, Current |  | 19.8 | 48.7
Regulatory Assets, Noncurrent |  | 415.6 | 306.0
Regulatory Liability, Current |  | 35.1 | 29.0
Regulatory Liability, Noncurrent |  | $ 1,188.9 | 1,223.5
CenterPoint [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Percentage Share of Management Rights |  | 50.00% |
OGE Energy [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Percentage Share of Management Rights |  | 50.00% |
SPP Cost Tracker Rider Over Recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Current | [1] | $ 0.0 | 2.6
Reserve for Tax Refund [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Current | [1] | 0.8 | 12.7
Income taxes recoverable from customers, net [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Noncurrent |  | 867.4 | 899.2
Accrued removal obligations [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Noncurrent |  | 316.8 | 318.5
Other Regulatory Liabilities [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Current | [1] | 4.2 | 6.9
Regulatory Liability, Noncurrent |  | 4.7 | 5.8
Oklahoma demand program rider over recovery |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Liability, Current | [1] | 1.5 | 2.0
SPP cost tracker under recovery [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Current | [2] | 7.0 | 0.0
Benefit obligations regulatory asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 164.9 | 167.2
Deferred storm expenses [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 158.8 | 65.5
Smart Grid [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 11.2 | 18.4
Unamortized loss on reacquired debt [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 9.7 | 10.6
Deferred Pension Expenses [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 9.3 | 8.0
Dry Scrubber Regulatory Asset [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 19.7 | 20.6
Other Regulatory Assets [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Current | [2] | 8.4 | 5.5
Regulatory Assets, Noncurrent |  | 11.1 | 13.4
Pension tracker [Member] |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 18.1 | 2.3
Frontier Plant |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 6.4 | 0.0
COVID-19 Impact |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Noncurrent |  | 6.4 | 0.0
Generation Capacity Replacement rider |  |  |
Schedule of Regulatory Assets and Liabilities [Line Items] |  |  |
Regulatory Assets, Current | [2] | $ 4.4 | $ 3.7
[1] | Included in Other Current Liabilities in the balance sheets.
[2] | Included in Other Current Assets in the balance sheets.

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