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Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Total long-term debt | $ 2,755.6 | $ 2,755.3
Percent of Principal Amount Subject to Optional Tender | 100.00% |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | $ 110.2 |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 225.2 |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 250.1 |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 250.1 |
Long-term Debt, Maturities, Repayments of Principal in Year Five | $ 0.1 |
Garfield Industrial Authority, January 1, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Date Due | Jan. 01, 2025 |
Muskogee Industrial Authority, Janaury 1, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Date Due | Jan. 01, 2025 |
Muskogee Industrial Authority, June 1, 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Date Due | Jun. 01, 2027 |
Redeemable during the next 12 months |  |
Debt Instrument [Line Items] |  |
Total long-term debt | $ 135.4 |
Redeemable during the next 12 months | Garfield Industrial Authority, January 1, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Series Minimum | 0.05% |
Series Maximum | 0.13% |
Redeemable during the next 12 months | Muskogee Industrial Authority, Janaury 1, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Series Minimum | 0.06% |
Series Maximum | 0.19% |
Redeemable during the next 12 months | Muskogee Industrial Authority, June 1, 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Series Minimum | 0.05% |
Series Maximum | 0.14% |
OG&E [Member] | Redeemable during the next 12 months | Garfield Industrial Authority, 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 | Muskogee Industrial Authority, Janaury 1, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt, gross | 32.4 | 32.4
OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority, June 1, 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt, gross | $ 56.0 | $ 56.0

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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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: 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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