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- Definition

Estimated Environmental Capital Costs

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- Definition

Factored-Fired Hours

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- Definition

Factored-Fired Starts

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- Definition

Percentage of output purchased

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- Definition

Potential Penalty Under the Federal Clean Air Act

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

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No definition available.

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- Definition

The estimated maximum amount of possible loss from the contingency.

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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Amount of operating expense for purchased power procured under arrangements extending beyond one year or the normal operating cycle, if longer, by regulated operation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Commitments and Contingencies Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 6,600,000
Operating Leases, Future Minimum Payments, Due in Two Years	30,800,000
Operating Leases, Future Minimum Payments, Due in Three Years	3,400,000
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	46,400,000
Operating Leases, Future Minimum Payments Due	92,000,000
Operating Leases, Rent Expense, Net	5,900,000us-gaap_OperatingLeasesRentExpenseNet	5,700,000us-gaap_OperatingLeasesRentExpenseNet	5,800,000us-gaap_OperatingLeasesRentExpenseNet
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	676,300,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	608,400,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	386,100,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	296,100,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	245,500,000
Unrecorded Unconditional Purchase Obligation	2,212,400,000
Utilities Operating Expense, Purchased Power under Long-term Contracts	60,800,000	62,000,000	49,500,000
OG&E Railcar Lease Agreement [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Maximum	22,800,000
OG&E cogeneration capacity and fixed operation and maintenance payments [Member]
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	85,200,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	83,300,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	80,700,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	77,800,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	70,600,000
Unrecorded Unconditional Purchase Obligation	397,600,000
OG&E expected cogeneration energy payments [Member]
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	74,400,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	78,500,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	81,200,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	89,700,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	85,100,000
Unrecorded Unconditional Purchase Obligation	408,900,000
OG&E minimum fuel purchase commitments [Member]
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	389,300,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	246,600,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	43,600,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	0
Unrecorded Unconditional Purchase Obligation, Due within Five Years	0
Unrecorded Unconditional Purchase Obligation	679,500,000
Long-term Purchase Commitment, Amount	625,800,000	680,800,000	653,700,000
OG&E expected wind purchase commitments [Member]
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	58,400,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	59,300,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	60,300,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	59,100,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	58,400,000
Unrecorded Unconditional Purchase Obligation	295,500,000
OG&E long-term service agreement commitments [Member]
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	2,500,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	2,600,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	2,700,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	19,400,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	27,500,000
Unrecorded Unconditional Purchase Obligation	54,700,000
Environmental Compliance Plan [Member]
Loss Contingencies [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	66,500,000
Unrecorded Unconditional Purchase Obligation, Due within Two Years	138,100,000
Unrecorded Unconditional Purchase Obligation, Due within Three Years	117,600,000
Unrecorded Unconditional Purchase Obligation, Due within Four Years	50,100,000
Unrecorded Unconditional Purchase Obligation, Due within Five Years	3,900,000
Unrecorded Unconditional Purchase Obligation	376,200,000
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	129,400,000	134,800,000	135,100,000
OG&E capacity payments [Member]
Loss Contingencies [Line Items]
Long-term Purchase Commitment, Amount	72,300,000	74,400,000	77,100,000
CPV Keenan [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	28,100,000	30,900,000	25,100,000
Edison Mission Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	21,300,000	20,600,000	20,200,000
FPL Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	3,600,000	3,300,000	3,400,000
NextEra Energy [Member]
Loss Contingencies [Line Items]
Utilities Operating Expense, Purchased Power under Long-term Contracts	7,800,000	7,200,000	800,000
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
Additional Factored-Fired Hours	24,000
Factored-Fired Starts	4,500
OG&E Railcar Lease Agreement [Member]
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	4,500,000
Operating Leases, Future Minimum Payments, Due in Two Years	28,700,000
Operating Leases, Future Minimum Payments, Due in Three Years	1,000,000
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	2,400,000
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	46,400,000
Operating Leases, Future Minimum Payments Due	57,800,000
New Source Review [Member]
Loss Contingencies [Line Items]
Estimated Environmental Capital Costs	1,100,000,000
Potential Penalty Under the Federal Clean Air Act	$ 37,500