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Long-Term Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Total long-term debt |  | $ 2,999.4 |  | $ 2,630.5
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 |  | 250.1 |  |
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 April 1, 2047 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long term debt, gross |  | $ 300.0 | $ 300.0 | 0.0
Debt Instrument, Interest Rate, Stated Percentage |  | 4.15% |  |
Date Due |  | Apr. 01, 2047 |  |
Senior Notes [Member] | OG&E [Member] | Series Due July 15, 2017 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long term debt, gross | $ 125.0 | $ 0.0 |  | 125.0
Debt Instrument, Interest Rate, Stated Percentage | 6.50% | 6.50% |  |
Date Due | Jul. 15, 2017 | Jul. 15, 2017 |  |
Senior Notes [Member] | OG&E [Member] | Series due August 15, 2047 [Member] [Domain] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long term debt, gross |  | $ 300.0 |  | $ 0.0
Debt Instrument, Interest Rate, Stated Percentage |  | 3.85% |  |
Date Due |  | Aug. 15, 2047 |  |
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 |  | 0.65% |  |
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 |  | 0.65% |  |
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 |  | 0.66% |  |
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 |  | 1.86% |  |
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 |  | 1.80% |  |
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 |  | 1.80% |  |

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