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Rate Matters and Regulation Rate Matters and Regulation (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($)
Public Utilities, Amount Requested for Acquisition | $ 53.5
Estimated Refund to SPP | 13.0
Dry Scrubber Project [Member] |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 512.4
Muskogee Natural Gas Conversion [Member] |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 57.0
OKLAHOMA |
Public Utilities, Requested Rate Increase (Decrease), Amount | 77.6
ARKANSAS |
Public Utilities, Approved Rate Increase (Decrease), Amount | $ (3.3)
FERC [Member] |
Public Utilities, Approved Return on Equity, Percentage | 10.60%
Recommended Common Equity Percentage | 7.85%
Impact to Company [Member] |
Estimated Refund to SPP | $ 5.0
Customer Impact [Member] |
Estimated Refund to SPP | $ 8.0

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