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Long-Term Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Percent of Principal Amount Subject to Optional Tender | 100.00% |
Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date |  | Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date |  | Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date |  | Jun. 01, 2027
Redeemable during the next 12 months |  |
Debt Instrument [Line Items] |  |
Long-term Debt | $ 135.4 |
OG&E [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt | 47.0 |
OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt | 32.4 |
OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 56.0 |
Minimum [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.65% |
Minimum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.65% |
Minimum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.66% |
Maximum [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.95% |
Maximum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.90% |
Maximum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.95% |
Senior Notes [Member] | OG&E [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt | $ 300.0 |
Senior Notes [Member] | OG&E [Member] | Series due April 1, 2047 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.15% |
Long term debt | $ 300.0 |
Debt Instrument, Maturity Date | Apr. 01, 2047 |
Senior Notes [Member] | OG&E [Member] | Series Due July 15, 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |
Long term debt | $ 125.0 |
Debt Instrument, Maturity Date | Jul. 15, 2017 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 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 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 + Details
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