Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Total long-term debt	$ 2,300.2	$ 2,050.3
Percent of Principal Amount Subject to Optional Tender	100.00%
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	0.2
Long-term Debt, Maturities, Repayments of Principal in Year Two	0.2
Long-term Debt, Maturities, Repayments of Principal in Year Three	110.2
Long-term Debt, Maturities, Repayments of Principal in Year Four	125.1
Long-term Debt, Maturities, Repayments of Principal in Year Five	250.1
Garfield Industrial Authority Bond, Due January 1, 2025 [Member]
Debt Instrument [Line Items]
Date Due	Jan. 01, 2025
Muskogee Industrial Authority Bond, Due January 1, 2025 [Member]
Debt Instrument [Line Items]
Date Due	Jan. 01, 2025
Muskogee Industrial Authority Bond, Due June 1, 2027 [Member]
Debt Instrument [Line Items]
Date Due	Jun. 01, 2027
Redeemable during the next 12 months [Member]
Debt Instrument [Line Items]
Total long-term debt	135.4
Redeemable during the next 12 months [Member] \| Garfield Industrial Authority Bond, Due January 1, 2025 [Member]
Debt Instrument [Line Items]
Series Minimum	0.18%
Series Maximum	0.34%
Redeemable during the next 12 months [Member] \| Muskogee Industrial Authority Bond, Due January 1, 2025 [Member]
Debt Instrument [Line Items]
Series Minimum	0.10%
Series Maximum	0.39%
Redeemable during the next 12 months [Member] \| Muskogee Industrial Authority Bond, Due June 1, 2027 [Member]
Debt Instrument [Line Items]
Series Minimum	0.10%
Series Maximum	0.30%
OG&E [Member] \| Redeemable during the next 12 months [Member] \| Garfield Industrial Authority Bond, Due January 1, 2025 [Member]
Debt Instrument [Line Items]
Long term debt, gross	47.0	47.0
OG&E [Member] \| Redeemable during the next 12 months [Member] \| Muskogee Industrial Authority Bond, Due January 1, 2025 [Member]
Debt Instrument [Line Items]
Long term debt, gross	32.4	32.4
OG&E [Member] \| Redeemable during the next 12 months [Member] \| Muskogee Industrial Authority Bond, Due June 1, 2027 [Member]
Debt Instrument [Line Items]
Long term debt, gross	56.0	56.0
Senior Notes [Member] \| OG&E [Member] \| Series due May 1, 2043 [Member]
Debt Instrument [Line Items]
Long term debt, gross	$ 250.0	$ 0
Debt Instrument, Interest Rate, Stated Percentage	3.90%
Date Due	May 01, 2043

Percent of Principal Amount Subject to Optional Tender

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

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