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Leases, Codification Topic 842 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Leases [Abstract]        
Lessee, Operating Lease, Contingent Liability $ 6.8 $ 16.2    
Lessee, Lease, Description [Line Items]        
Operating Lease, Cost 5.1 4.1 $ 5.4  
Cash Paid on Operating Leases 4.8      
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 10.7      
Operating Lease, Right-of-Use Asset 39.6 [1]     $ 32.3
Operating Lease, Liability $ 44.3 [2]     $ 36.9
Operating Lease, Weighted Average Remaining Lease Term 13 years 6 months      
Operating Lease, Weighted Average Discount Rate, Percent 3.90%      
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 0.0 21.1 [3],[4]    
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 5.3 2.9 [3],[4]    
Lessee, Operating Lease, Liability, Payments, Due Year Two 5.2 2.9 [3],[4]    
Lessee, Operating Lease, Liability, Payments, Due Year Three 5.2 2.9 [3],[4]    
Lessee, Operating Lease, Liability, Payments, Due Year Four 5.2 2.9 [3],[4]    
Lessee, Operating Lease, Liability, Payments, Due Year Five 3.1 3.0 [3],[4]    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 34.7 34.6 [3],[4]    
Lessee, Operating Lease, Liability, Payments, Due 58.7 70.3 [3],[4]    
Lessee, Operating Lease, Contingent Liability 6.8 $ 16.2    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount $ 14.4      
[1] Included in Property, Plant and Equipment in the 2019 Balance Sheet.
[2] Included in Other Deferred Credits and Other Liabilities in the 2019 Balance Sheet.
[3] Amounts included for comparability and accounted for in accordance with ASC 840, "Leases."
[4] At the end of the railcar lease term, which was February 1, 2019, OG&E had the option to either purchase the railcars at a stipulated fair market value or renew the lease. OG&E renewed the lease effective February 1, 2019. If OG&E chose not to purchase the railcars or renew the lease agreement and the actual fair value of the railcars was less than the stipulated fair market value, OG&E would have been responsible for the difference in those values up to a maximum of $16.2 million.