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CONSOLIDATED STATEMENTS OF CAPITALIZATION - USD ($) shares in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Common Stock, Value | $ 2.0 | $ 2.0
Premium on common stock | 1,122.6 | 1,129.3
Retained earnings | 2,544.6 | 3,036.1
Accumulated other comprehensive loss, net of tax | $ (32.1) | $ (27.9)
Treasury Stock, Common, Shares | 0.1 | 0.0
Treasury Stock, Value | $ (5.3) | $ 0.0
Total stockholders' equity | 3,631.8 | 4,139.5
Unamortized debt expense | (25.3) | (24.2)
Total long-term debt | 3,494.4 | 3,195.2
Less: long-term debt due within one year | 0.0 | 0.0
Total long-term debt (excluding long-term debt due within one year) | 3,494.4 | 3,195.2
Total capitalization (including long-term debt due within one year) | $ 7,126.2 | $ 7,334.7
Common Stock, Par or Stated Value Per Share | $ 0.01 | $ 0.01
Common Stock, Shares Authorized | 450.0 | 450.0
Common Stock, Shares, Outstanding | 200.1 | 200.1
Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Common Stock, Value | $ 100.9 | $ 100.9
Premium on common stock | 938.6 | 935.7
Retained earnings | 2,936.1 | 2,921.7
Total stockholders' equity | 3,975.6 | 3,958.3
Unamortized debt expense | (25.3) | (24.2)
Unamortized discount | (10.1) | (10.5)
Total long-term debt | 3,494.4 | 3,195.2
Less: long-term debt due within one year | 0.0 | 0.0
Total long-term debt (excluding long-term debt due within one year) | 3,494.4 | 3,195.2
Total capitalization (including long-term debt due within one year) | $ 7,470.0 | $ 7,153.5
Common Stock, Par or Stated Value Per Share | $ 2.50 | $ 2.50
Common Stock, Shares Authorized | 100.0 | 100.0
Common Stock, Shares, Outstanding | 40.4 | 40.4
Garfield Industrial Authority Bond [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Debt Instrument, Maturity Date | Jan. 01, 2025 |
Muskogee Industrial Authority Bond Due 2025 [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Debt Instrument, Maturity Date | Jan. 01, 2025 |
Muskogee Industrial Authority Bond Due 2027 [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Debt Instrument, Maturity Date | Jun. 01, 2027 |
Senior Notes [Member] | Series Due July 15, 2027 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 125.0 | $ 125.0
Debt Instrument, Interest Rate, Stated Percentage | 6.65% |
Debt Instrument, Maturity Date | Jul. 15, 2027 |
Senior Notes [Member] | Series Due April 15, 2028 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 100.0 | 100.0
Debt Instrument, Interest Rate, Stated Percentage | 6.50% |
Debt Instrument, Maturity Date | Apr. 15, 2028 |
Senior Notes [Member] | Series Due August 15, 2028 [Member] [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 400.0 | 400.0
Debt Instrument, Interest Rate, Stated Percentage | 3.80% |
Senior Notes [Member] | Series Due March 15, 2030 | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 300.0 | 300.0
Debt Instrument, Interest Rate, Stated Percentage | 3.30% |
Debt Instrument, Maturity Date | Mar. 15, 2030 |
Senior Notes [Member] | Series Due January 15, 2036 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 110.0 | 110.0
Debt Instrument, Interest Rate, Stated Percentage | 5.75% |
Debt Instrument, Maturity Date | Jan. 15, 2036 |
Senior Notes [Member] | Series Due February 1, 2038 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 200.0 | 200.0
Debt Instrument, Interest Rate, Stated Percentage | 6.45% |
Debt Instrument, Maturity Date | Feb. 01, 2038 |
Senior Notes [Member] | Series Due June 1, 2040 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 250.0 | 250.0
Debt Instrument, Interest Rate, Stated Percentage | 5.85% |
Debt Instrument, Maturity Date | Jun. 01, 2040 |
Senior Notes [Member] | Series Due May 15, 2041 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 250.0 | 250.0
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |
Debt Instrument, Maturity Date | May 15, 2041 |
Senior Notes [Member] | Series Due May 1, 2043 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 250.0 | 250.0
Debt Instrument, Interest Rate, Stated Percentage | 3.90% |
Debt Instrument, Maturity Date | May 01, 2043 |
Senior Notes [Member] | Series Due March 15, 2044 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 250.0 | 250.0
Debt Instrument, Interest Rate, Stated Percentage | 4.55% |
Debt Instrument, Maturity Date | Mar. 15, 2044 |
Senior Notes [Member] | Series Due December 15, 2044 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 250.0 | 250.0
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |
Debt Instrument, Maturity Date | Dec. 15, 2044 |
Senior Notes [Member] | Series due August 15, 2047 [Member] [Domain] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 300.0 | 300.0
Debt Instrument, Interest Rate, Stated Percentage | 3.85% |
Debt Instrument, Maturity Date | Aug. 15, 2047 |
Senior Notes [Member] | Series due April 1, 2047 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 300.0 | 300.0
Debt Instrument, Interest Rate, Stated Percentage | 4.15% |
Debt Instrument, Maturity Date | Apr. 01, 2047 |
Senior Notes [Member] | Series Due April 1, 2030 | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 300.0 | 0.0
Debt Instrument, Interest Rate, Stated Percentage | 3.25% |
Debt Instrument, Maturity Date | Apr. 01, 2030 |
Senior Notes [Member] | Series due August 15, 2028 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Debt Instrument, Maturity Date | Aug. 15, 2028 |
Long-term Debt [Member] | Due August 31, 2062 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 9.4 | 9.5
Debt Instrument, Interest Rate, Stated Percentage | 3.80% |
Debt Instrument, Maturity Date | Aug. 31, 2062 |
Debentures Subject to Mandatory Redemption [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Total long-term debt | $ 135.4 |
Debentures Subject to Mandatory Redemption [Member] | Garfield Industrial Authority Bond [Member] | Minimum [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.28% |
Debentures Subject to Mandatory Redemption [Member] | Garfield Industrial Authority Bond [Member] | Maximum [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.35% |
Debentures Subject to Mandatory Redemption [Member] | Garfield Industrial Authority Bond [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 47.0 | 47.0
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority Bond Due 2025 [Member] | Minimum [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.33% |
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority Bond Due 2025 [Member] | Maximum [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.31% |
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority Bond Due 2025 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 32.4 | 32.4
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority Bond Due 2027 [Member] | Minimum [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.28% |
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority Bond Due 2027 [Member] | Maximum [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.35% |
Debentures Subject to Mandatory Redemption [Member] | Muskogee Industrial Authority Bond Due 2027 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 56.0 | $ 56.0

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