Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 6,700,000
Operating Leases, Future Minimum Payments, Due in Two Years	6,000,000
Operating Leases, Future Minimum Payments, Due in Three Years	30,200,000
Operating Leases, Future Minimum Payments, Due in Four Years	3,200,000
Operating Leases, Future Minimum Payments, Due in Five Years	3,100,000
Operating Leases, Future Minimum Payments, Due Thereafter	48,800,000
Operating Leases, Future Minimum Payments Due	98,000,000
Operating Leases, Rent Expense, Net	8,800,000	14,200,000	10,400,000
Long-term Purchase Commitment, Amount	2,824,600,000
Purchase Obligation, Due in Next Twelve Months	726,500,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	657,100,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	588,400,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	609,600,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	243,000,000
Utilities Operating Expense, Purchased Power under Long-term Contracts	62,000,000	49,500,000	36,700,000
Commitments and Contingencies
Estimated Environmental Capital Costs	1,000,000,000
Potential Penalty Under the Federal Clean Air Act	37,500
OG&E Railcar Lease Agreement [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Maximum	22,800,000
OG&E Railcar Lease Agreement [Member]
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	3,800,000
Operating Leases, Future Minimum Payments, Due in Two Years	3,100,000
Operating Leases, Future Minimum Payments, Due in Three Years	27,300,000
Operating Leases, Future Minimum Payments, Due in Four Years	0
Operating Leases, Future Minimum Payments, Due in Five Years	0
Operating Leases, Future Minimum Payments, Due Thereafter	0
Operating Leases, Future Minimum Payments Due	34,200,000
OG&E Wind Farm Land Lease Agreements [Member]
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	2,100,000
Operating Leases, Future Minimum Payments, Due in Two Years	2,100,000
Operating Leases, Future Minimum Payments, Due in Three Years	2,100,000
Operating Leases, Future Minimum Payments, Due in Four Years	2,400,000
Operating Leases, Future Minimum Payments, Due in Five Years	2,400,000
Operating Leases, Future Minimum Payments, Due Thereafter	48,800,000
Operating Leases, Future Minimum Payments Due	59,900,000
OGE Energy Building Lease [Member]
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	800,000
Operating Leases, Future Minimum Payments, Due in Two Years	800,000
Operating Leases, Future Minimum Payments, Due in Three Years	800,000
Operating Leases, Future Minimum Payments, Due in Four Years	800,000
Operating Leases, Future Minimum Payments, Due in Five Years	700,000
Operating Leases, Future Minimum Payments, Due Thereafter	0
Operating Leases, Future Minimum Payments Due	3,900,000
OGE Holdings [Member]
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due	0
OG&E cogeneration capacity and fixed operation and maintenance payments [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	406,300,000
Purchase Obligation, Due in Next Twelve Months	85,100,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	82,700,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	81,900,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	79,600,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	77,000,000
OG&E expected cogeneration energy payments [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	366,600,000
Purchase Obligation, Due in Next Twelve Months	61,100,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	60,900,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	75,700,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	81,500,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	87,400,000
OG&E minimum fuel purchase commitments [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	1,657,200,000
Purchase Obligation, Due in Next Twelve Months	451,800,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	451,800,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	368,500,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	385,100,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	0
Long-term Purchase Commitment, Amount	657,300,000	585,600,000	647,600,000
Percentage of OG&E's Projected 2014 Requirements	31.50%
OG&E expected wind purchase commitments [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	297,000,000
Purchase Obligation, Due in Next Twelve Months	58,000,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	58,900,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	59,800,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	60,800,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	59,500,000
OG&E long-term service agreement commitments [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	97,500,000
Purchase Obligation, Due in Next Twelve Months	70,500,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	2,800,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	2,500,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	2,600,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	19,100,000
Public Utility Regulatory Policy Act of 1978 [Member]
Loss Contingencies [Line Items]
Percentage of output purchased	100.00%
CPV Keenan [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	30,900,000	25,100,000	24,500,000
Edison Mission Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	20,600,000	20,200,000	8,500,000
FPL Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	3,300,000	3,400,000	3,700,000
NextEra Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	7,200,000	800,000	0
OG&E total cogeneration payments [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	134,800,000	135,100,000	140,700,000
OG&E capacity payments [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	74,400,000	77,100,000	78,000,000
OG&E long-term service agreement commitments [Member] | McClain Plant [Member]
Loss Contingencies [Line Items]
Factored-Fired Hours	128,000
Factored-Fired Starts	3,600
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
Enogex [Member]
Loss Contingencies [Line Items]
Commitments and Contingencies	0
OG&E Wind Energy Purchase Power Lawsuit [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 4,300,000