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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]
The Company's future purchase obligations and commitments estimated for the next five years are as follows: 
(In millions)20202021202220232024Total
Purchase obligations and commitments:      
Minimum purchase commitments$82.6  $55.1  $50.4  $50.4  $32.9  $271.4  
Expected wind purchase commitments55.7  56.0  56.4  56.8  57.5  282.4  
Long-term service agreement commitments2.4  2.4  2.4  13.8  32.1  53.1  
Environmental compliance plan expenditures0.4  —  —  —  —  0.4  
Total purchase obligations and commitments$141.1  $113.5  $109.2  $121.0  $122.5  $607.3  
Schedule of Wind Power Purchases [Table Text Block]
The following table summarizes OG&E's wind power purchase contracts.
CompanyLocationOriginal Term of ContractExpiration of ContractMWs
CPV KeenanWoodward County, OK20 years2030152.0  
Edison Mission EnergyDewey County, OK20 years2031130.0  
NextEra EnergyBlackwell, OK20 years203260.0  

The following table summarizes OG&E's wind power purchases for the years ended December 31, 2019, 2018 and 2017. 
Year Ended December 31 (In millions)
201920182017
CPV Keenan$27.2  $27.0  $29.0  
Edison Mission Energy23.1  21.7  22.1  
NextEra Energy7.4  6.8  7.4  
FPL Energy (A)—  2.1  2.6  
Total wind power purchased$57.7  $57.6  $61.1  
(A)OG&E's purchased power contract with FPL Energy for 50 MWs expired in 2018.