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Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 Garfield Industrial Authority Bond [Member] | Jun. 30, 2014 Muskogee Industrial Authority Bond Due 2025 [Member] | Jun. 30, 2014 Muskogee Industrial Authority Bond Due 2027 [Member] | Jun. 30, 2014 Redeemable during the next 12 months | Jun. 30, 2014 Redeemable during the next 12 months Garfield Industrial Authority Bond [Member] | Jun. 30, 2014 Redeemable during the next 12 months Muskogee Industrial Authority Bond Due 2025 [Member] | Jun. 30, 2014 Redeemable during the next 12 months Muskogee Industrial Authority Bond Due 2027 [Member] | Jun. 30, 2014 OG&E [Member] Redeemable during the next 12 months Garfield Industrial Authority Bond [Member] | Jun. 30, 2014 OG&E [Member] Redeemable during the next 12 months Muskogee Industrial Authority Bond Due 2025 [Member] | Jun. 30, 2014 OG&E [Member] Redeemable during the next 12 months Muskogee Industrial Authority Bond Due 2027 [Member] | Jun. 30, 2014 Senior Notes [Member] OG&E [Member] Series due May 1, 2043 [Member] | Sep. 30, 2014 Senior Notes [Member] OG&E [Member] Series Due August 1, 2034 [Member] | Aug. 01, 2014 Senior Notes [Member] OG&E [Member] Series Due August 1, 2034 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series Minimum |  |  |  |  |  |  | 0.15% | 0.08% | 0.08% |  |  |  |  |  |
Series Maximum |  |  |  |  |  |  | 0.20% | 0.18% | 0.11% |  |  |  |  |  |
Long term debt, gross |  |  |  |  |  |  |  |  |  | $ 47.0 | $ 32.4 | $ 56.0 | $ 250.0 |  | $ 140.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 4.55% |  | 6.50%
Long-term debt |  |  |  |  |  | 135.4 |  |  |  |  |  |  |  |  |
Date Due |  |  | Jan. 01, 2025 | Jan. 01, 2025 | Jun. 01, 2027 |  |  |  |  |  |  |  | Mar. 15, 2044 | Aug. 01, 2034 |
Percent of Principal Amount Subject to Optional Tender |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  | 103.25% |
Redemption Premium | $ 4.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share. + References No definition available. + Details
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