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CONSOLIDATED STATEMENTS OF CAPITALIZATION - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Common stock, par value $0.01 per share; authorized 450.0 shares; and outstanding 199.7 shares and 199.7 shares, respectively | $ 2.0 | $ 2.0
Premium on common stock | 1,103.8 | 1,099.3
Retained earnings | 2,367.3 | 2,259.8
Accumulated other comprehensive loss, net of tax | (29.3) | (35.1)
Total stockholders' equity | 3,443.8 | 3,326.0
Unamortized debt expense | (15.5) | (16.8)
Total long-term debt | 2,630.5 | 2,738.8
Less long-term debt due within one year | (224.7) | (110.0)
Total long-term debt (excluding debt due within one year) | 2,405.8 | 2,628.8
Total Capitalization (including long-term debt due within one year) | 6,074.3 | 6,064.8
Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Unamortized discount | (9.3) | (9.8)
Senior Notes [Member] | Series Due November 24, 2017 [Member] | OGE Energy [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 100.0 | 100.0
Debt Instrument, Interest Rate, Stated Percentage | 1.38% |
Senior Notes [Member] | Series Due January 15, 2016 [Member] | Og and E [Member] |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |
Long-term Debt, Gross | $ 0.0 | 110.0
Debt Instrument, Interest Rate, Stated Percentage | 5.15% |
Senior Notes [Member] | Series Due July 15, 2017 [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 | 6.50% |
Senior Notes [Member] | Series Due September 1, 2018 [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 | 6.35% |
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 | $ 250.0 | 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 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% |
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 | $ 9.9 | 10.0
Debt Instrument, Interest Rate, Stated Percentage | 3.70% |
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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