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v3.20.4

Long-Term Debt (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Total long-term debt | $ 3,494.4 | $ 3,195.2
Percent of Principal Amount Subject to Optional Tender | 100.00% |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | $ 0.0 |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 0.0 |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 0.0 |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 0.0 |
Long-term Debt, Maturities, Repayments of Principal in Year Five | $ 0.0 |
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] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 3,494.4 | 3,195.2
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 April 1, 2030 |  |
Debt Instrument [Line Items] |  |
Long term debt, gross | $ 300.0 | $ 0.0
Debt Instrument, Interest Rate, Stated Percentage | 3.25% |
Date Due | Apr. 01, 2030 |
Debt Instrument, Face Amount | $ 300.0 |
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 | 0.28% |
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 | 0.33% |
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 | 0.28% |
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 | 5.35% |
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 | 4.31% |
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 | 5.35% |

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