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Commitments and Contingencies (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 15, 2015
USD ($)
Loss Contingencies [Line Items]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months $ 6.0      
Operating Leases, Future Minimum Payments, Due in Two Years 4.9      
Operating Leases, Future Minimum Payments, Due in Three Years 23.5      
Operating Leases, Future Minimum Payments, Due in Four Years 2.9      
Operating Leases, Future Minimum Payments, Due in Five Years 2.9      
Operating Leases, Future Minimum Payments, Due Thereafter 43.5      
Operating Leases, Future Minimum Payments Due 83.7      
Operating Leases, Rent Expense, Net 9.3 $ 7.7 $ 6.7  
Purchase Obligation, Due in Next Twelve Months 711.8      
Unrecorded Unconditional Purchase Obligation, Due within Two Years 331.9      
Unrecorded Unconditional Purchase Obligation, Due within Three Years 229.3      
Unrecorded Unconditional Purchase Obligation, Due within Four Years 179.7      
Unrecorded Unconditional Purchase Obligation, Due within Five Years 179.9      
Long-term Purchase Commitment, Amount 1,632.6      
Utilities Operating Expense, Purchased Power under Long-term Contracts 61.0 56.6 60.8  
Contract Amount       $ 170.3
OG&E Railcar Lease Agreement [Member]        
Loss Contingencies [Line Items]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months 2.7      
Operating Leases, Future Minimum Payments, Due in Two Years 1.7      
Operating Leases, Future Minimum Payments, Due in Three Years 21.0      
Operating Leases, Future Minimum Payments, Due in Four Years 0.0      
Operating Leases, Future Minimum Payments, Due in Five Years 0.0      
Operating Leases, Future Minimum Payments, Due Thereafter 0.0      
Operating Leases, Future Minimum Payments Due 25.4      
OG&E Wind Farm Land Lease Agreements [Member]        
Loss Contingencies [Line Items]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months 2.5      
Operating Leases, Future Minimum Payments, Due in Two Years 2.5      
Operating Leases, Future Minimum Payments, Due in Three Years 2.5      
Operating Leases, Future Minimum Payments, Due in Four Years 2.9      
Operating Leases, Future Minimum Payments, Due in Five Years 2.9      
Operating Leases, Future Minimum Payments, Due Thereafter 43.5      
Operating Leases, Future Minimum Payments Due 56.8      
OGE Energy Building Lease [Member]        
Loss Contingencies [Line Items]        
Operating Leases, Future Minimum Payments Due, Next Twelve Months 0.8      
Operating Leases, Future Minimum Payments, Due in Two Years 0.7      
Operating Leases, Future Minimum Payments, Due in Three Years 0.0      
Operating Leases, Future Minimum Payments, Due in Four Years 0.0      
Operating Leases, Future Minimum Payments, Due in Five Years 0.0      
Operating Leases, Future Minimum Payments, Due Thereafter 0.0      
Operating Leases, Future Minimum Payments Due 1.5      
OG&E cogeneration capacity and fixed operation and maintenance payments [Member]        
Loss Contingencies [Line Items]        
Purchase Obligation, Due in Next Twelve Months 77.1      
Unrecorded Unconditional Purchase Obligation, Due within Two Years 73.9      
Unrecorded Unconditional Purchase Obligation, Due within Three Years 66.5      
Unrecorded Unconditional Purchase Obligation, Due within Four Years 54.7      
Unrecorded Unconditional Purchase Obligation, Due within Five Years 51.0      
Long-term Purchase Commitment, Amount 323.2      
OG&E expected cogeneration energy payments [Member]        
Loss Contingencies [Line Items]        
Purchase Obligation, Due in Next Twelve Months 37.7      
Unrecorded Unconditional Purchase Obligation, Due within Two Years 37.5      
Unrecorded Unconditional Purchase Obligation, Due within Three Years 38.9      
Unrecorded Unconditional Purchase Obligation, Due within Four Years 40.7      
Unrecorded Unconditional Purchase Obligation, Due within Five Years 44.4      
Long-term Purchase Commitment, Amount 199.2      
OG&E minimum fuel purchase commitments [Member]        
Loss Contingencies [Line Items]        
Purchase Obligation, Due in Next Twelve Months 236.2      
Unrecorded Unconditional Purchase Obligation, Due within Two Years 49.3      
Unrecorded Unconditional Purchase Obligation, Due within Three Years 36.2      
Unrecorded Unconditional Purchase Obligation, Due within Four Years 24.6      
Unrecorded Unconditional Purchase Obligation, Due within Five Years 24.6      
Long-term Purchase Commitment, Amount 370.9      
OG&E expected wind purchase commitments [Member]        
Loss Contingencies [Line Items]        
Purchase Obligation, Due in Next Twelve Months 59.0      
Unrecorded Unconditional Purchase Obligation, Due within Two Years 57.9      
Unrecorded Unconditional Purchase Obligation, Due within Three Years 56.6      
Unrecorded Unconditional Purchase Obligation, Due within Four Years 57.1      
Unrecorded Unconditional Purchase Obligation, Due within Five Years 57.5      
Long-term Purchase Commitment, Amount 288.1      
OG&E long-term service agreement commitments [Member]        
Loss Contingencies [Line Items]        
Purchase Obligation, Due in Next Twelve Months 2.2      
Unrecorded Unconditional Purchase Obligation, Due within Two Years 28.4      
Unrecorded Unconditional Purchase Obligation, Due within Three Years 22.2      
Unrecorded Unconditional Purchase Obligation, Due within Four Years 2.4      
Unrecorded Unconditional Purchase Obligation, Due within Five Years 2.4      
Long-term Purchase Commitment, Amount 57.6      
Mustang Modernization [Member]        
Loss Contingencies [Line Items]        
Purchase Obligation, Due in Next Twelve Months 130.4      
Unrecorded Unconditional Purchase Obligation, Due within Two Years 21.9      
Unrecorded Unconditional Purchase Obligation, Due within Three Years 0.0      
Unrecorded Unconditional Purchase Obligation, Due within Four Years 0.0      
Unrecorded Unconditional Purchase Obligation, Due within Five Years 0.0      
Long-term Purchase Commitment, Amount 152.3      
Environmental compliance plan expenditures [Member]        
Loss Contingencies [Line Items]        
Purchase Obligation, Due in Next Twelve Months 169.2      
Unrecorded Unconditional Purchase Obligation, Due within Two Years 63.0      
Unrecorded Unconditional Purchase Obligation, Due within Three Years 8.9      
Unrecorded Unconditional Purchase Obligation, Due within Four Years 0.2      
Unrecorded Unconditional Purchase Obligation, Due within Five Years 0.0      
Long-term Purchase Commitment, Amount $ 241.3      
Public Utility Regulatory Policy Act of 1978 [Member]        
Loss Contingencies [Line Items]        
Percentage of output purchased 100.00%      
OG&E total cogeneration payments [Member]        
Loss Contingencies [Line Items]        
Long-term Purchase Commitment, Amount $ 124.8 124.0 129.4  
OG&E capacity payments [Member]        
Loss Contingencies [Line Items]        
Long-term Purchase Commitment, Amount 66.3 69.5 72.3  
CPV Keenan [Member]        
Loss Contingencies [Line Items]        
Utilities Operating Expense, Purchased Power under Long-term Contracts 29.2 26.7 28.1  
Edison Mission Energy [Member]        
Loss Contingencies [Line Items]        
Utilities Operating Expense, Purchased Power under Long-term Contracts 21.1 19.7 21.3  
FPL Energy [Member]        
Loss Contingencies [Line Items]        
Utilities Operating Expense, Purchased Power under Long-term Contracts 3.4 3.2 3.6  
NextEra Energy [Member]        
Loss Contingencies [Line Items]        
Utilities Operating Expense, Purchased Power under Long-term Contracts $ 7.3 $ 7.0 $ 7.8  
OG&E long-term service agreement commitments [Member] | McClain Plant [Member]        
Loss Contingencies [Line Items]        
Factored-Fired Hours 128,000      
Factored-Fired Starts 4,800      
OG&E long-term service agreement commitments [Member] | Redbud Plant [Member]        
Loss Contingencies [Line Items]        
Factored-Fired Hours 144,000      
Factored-Fired Starts 4,500      
Additional Factored-Fired Hours 24,000      
Clean Power Plan [Member]        
Loss Contingencies [Line Items]        
Proposed Rate-Based Carbon Reduction 43.00%      
Final Rate-Based Carbon Reduction 32.00%      
Mass-Based Carbon Reduction 24.00%      
Maximum [Member]        
Loss Contingencies [Line Items]        
Loss Contingency, Range of Possible Loss, Maximum $ 18.3