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Rate Matters and Regulation (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Public Utilities, Approved Rate Increase (Decrease), Amount |  | $ (64.0) |
Public Utilities, Approved Return on Equity, Percentage |  | 9.50% |
Public Utilities, Approved Equity Capital Structure, Percentage |  | 53.00% |
Customer Refund Liability, Current |  | $ 0.3 | $ 1.7
Interim Rate Revenue Reserved |  | $ 15.4 |
Public Utilities, Approved Debt Capital Structure, Percentage |  | 47.00% |
Regulatory Assets, Current |  | $ 18.5 | 40.8
Recommended Disallowance for Fuel Adjustment |  | 3.3 |
Refund for Fuel Adjustment |  | 2.4 |
Public Utilities, Amount Requested for Acquisition |  | $ 53.5 |
Oklahoma Corporation Commission [Member] |  |  |
OG&E's Jurisdictional Revenues |  | 86.00% |
Arkansas Public Service Commission [Member] |  |  |
OG&E's Jurisdictional Revenues |  | 8.00% |
Federal Energy Regulatory Commission [Member] |  |  |
OG&E's Jurisdictional Revenues |  | 6.00% |
Dry Scrubber Project [Member] |  |  |
Estimated Environmental Capital Costs |  | $ 520.0 |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress |  | 504.3 |
OKLAHOMA |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | 77.6 |
Customer Refund Liability, Current |  | 18.9 |
Interim Rate Revenue Reserved |  | 5.6 |
ARKANSAS |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | 6.4 |
Public Utilities, Approved Rate Increase (Decrease), Amount |  | (3.3) |
Customer Refund Liability, Current |  | 7.7 |
Oklahoma demand program rider under recovery [Member] |  |  |
Regulatory Assets, Current | [1] | 6.4 | $ 31.6
January 16, 2018 [Member] | OKLAHOMA |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 1.9 |
Public Utilities, Requested Return on Equity, Percentage |  | 9.90% |
FERC [Member] |  |  |
Recommended Common Equity Percentage |  | 7.85% |
Public Utilities, Approved Return on Equity, Percentage |  | 10.60% |
Revenue impact of recommended change in return on common equity |  | $ 1.5 |
[1] | Included in Other Current Assets on the Consolidated Balance Sheets.

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