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CONSOLIDATED STATEMENTS OF CAPITALIZATION - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Common stock, par value $0.01 per share; authorized 450.0 shares; and outstanding 200.1 shares and 199.7 shares, respectively | $ 2.0 | $ 2.0
Premium on common stock | 1,129.3 | 1,125.7
Retained earnings | 3,036.1 | 2,906.3
Accumulated other comprehensive loss, net of tax | (27.9) | (28.9)
Total stockholders' equity | 4,139.5 | 4,005.1
Unamortized debt expense | (24.2) | (22.9)
Total long-term debt | 3,195.2 | 3,146.9
Less: long-term debt due within one year | 0.0 | (250.0)
Total long-term debt (excluding long-term debt due within one year) | 3,195.2 | 2,896.9
Total capitalization (including long-term debt due within one year) | 7,334.7 | 7,152.0
Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Unamortized discount | (10.5) | (10.2)
Senior Notes [Member] | Series Due January 15, 2019 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 0.0 | 250.0
Debt Instrument, Interest Rate, Stated Percentage | 8.25% |
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% |
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% |
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 | 0.0
Debt Instrument, Interest Rate, Stated Percentage | 3.30% |
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% |
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% |
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% |
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% |
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% |
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% |
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% |
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% |
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% |
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 | $ 9.5 | 9.6
Debt Instrument, Interest Rate, Stated Percentage | 3.80% |
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] | 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] | 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] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 56.0 | $ 56.0

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