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Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Total long-term debt | $ 3,146.9 | $ 2,999.4
Percent of Principal Amount Subject to Optional Tender | 100.00% |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | $ 250.1 |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 0.1 |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 0.1 |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 0.1 |
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 |
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
Senior Notes [Member] | OG&E [Member] | Series due August 15, 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt, gross | $ 400.0 |
Debt Instrument, Interest Rate, Stated Percentage | 3.80% |
Date Due | Aug. 15, 2028 |
Senior Notes [Member] | OG&E [Member] | Series due September 1, 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt, gross | $ 0.0 | $ 250.0
Debt Instrument, Interest Rate, Stated Percentage | 6.35% | 6.35%
Date Due | Sep. 01, 2018 | Sep. 01, 2018
Minimum [Member] | Redeemable during the next 12 months | Garfield Industrial Authority, January 1, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.01% |
Minimum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority, Janaury 1, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.01% |
Minimum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority, June 1, 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.03% |
Maximum [Member] | Redeemable during the next 12 months | Garfield Industrial Authority, January 1, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.00% |
Maximum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority, Janaury 1, 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.83% |
Maximum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority, June 1, 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.86% |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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