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Rate Matters and Regulation Rate Matters and Regulation (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Dry Scrubber Project [Member] |  |
Estimated Environmental Capital Costs |  | $ 547.5
Public Utilities, Property, Plant and Equipment, Construction Work in Progress |  | 281.6
Mustang Modernization [Member] |  |
Estimated Environmental Capital Costs |  | 424.9
Public Utilities, Property, Plant and Equipment, Construction Work in Progress |  | 231.8
OKLAHOMA |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 92.5
Public Utilities, Requested Return on Equity, Percentage |  | 10.25%
Public Utilities, Requested Equity Capital Structure, Percentage |  | 53.00%
Investments Since Last Rate Case |  | $ 1,600.0
Public Utilities, Interim Rate Increase (Decrease), Amount |  | 69.5
Public Utilities, Approved Rate Increase (Decrease), Amount | $ 8.8 |
Public Utilities, Approved Return on Equity, Percentage | 9.50% |
Approved Depreciation Reduction from ALJ Recommendation | $ 28.6 |
ALJ Depreciation Recommendation | $ 36.4 |
Approved Recovery of Short-term Incentive Comp | 50.00% |
Approved Recovery of Long-term Incentive Comp | 0.00% |
ARKANSAS |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 16.5
Public Utilities, Requested Return on Equity, Percentage |  | 10.25%
Investments Since Last Rate Case |  | $ 3,000.0
Settlement of Rate Increase | $ 7.1 |
Settlement of Return on Equity, Percentage | 9.50% |
Settlement of Equity Capital Structure, Percentage | 50.00% |
Administrative Law Judge [Member] |  |
Recommended Return on Equity |  | 9.87%
Recommended Capital Structure, Equity Percentage |  | 53.00%
Recommended Capital Structure, Debt Percentage |  | 47.00%
Recommended Increase (Decrease) in Revenue |  | $ 40.7

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