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INCOME AND EXCISE TAXES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Capital loss carryforward | $ 152.0 |  |  |  |  |  |  |  |  |  |  |
Capital loss carryforwards subject to limitations | 92.0 |  |  |  |  |  |  |  |  |  |  |
Carry forward of excess distributable earnings | 635.0 |  | $ 646.0 |  | $ 679.0 |  |  |  |  |  |  |
Excise tax expense | 23.0 |  | 30.0 |  | 24.0 |  |  |  |  |  |  |
Refund request for overpayment of excise taxes | 2.0 |  |  |  | 1.0 |  |  |  |  |  |  |
Tax cost basis | 22,500.0 |  | 22,000.0 |  |  |  |  |  |  |  |  |
Aggregate gross unrealized gain for federal tax purposes | 1,300.0 |  | 1,000.0 |  |  |  |  |  |  |  |  |
Aggregate gross unrealized loss for federal tax purposes | 1,700.0 |  | 1,200.0 |  |  |  |  |  |  |  |  |
Amortized cost of investments | 22,667.6 | [1] | 22,043.0 | [2] |  |  |  |  |  |  |  |
Tax reclassification of stockholders' equity, increase (decreased) | 0.0 |  | 0.0 |  | 0.0 |  |  |  |  |  |  |
Total stockholders’ equity | 11,201.0 |  | 9,555.0 |  | 8,868.0 | $ 7,176.0 | $ 7,467.0 | $ 7,300.0 | $ 7,098.0 | $ 5,165.0 | $ 5,173.0 | $ 5,284.0
Income tax expense, including excise tax | 20.0 |  | 55.0 |  | 29.0 |  |  |  |  |  |  |
Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense, including excise tax | (3.0) |  | 25.0 |  | 6.0 |  |  |  |  |  |  |
Capital in Excess of Par Value |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax reclassification of stockholders' equity, increase (decreased) | (20.0) |  | (22.0) |  | 40.0 |  |  |  |  |  |  |
Total stockholders’ equity | 10,738.0 |  | 9,556.0 |  | 8,553.0 | 7,656.0 |  |  |  |  |  |
Accumulated Undistributed (Overdistributed) Earnings |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Tax reclassification of stockholders' equity, increase (decreased) | 20.0 |  | 22.0 |  | (40.0) |  |  |  |  |  |  |
Total stockholders’ equity | 462.0 |  | (2.0) |  | $ 315.0 | $ (480.0) |  |  |  |  |  |
Retained Earnings, Accumulated Undistributed Net Investment Income |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders’ equity | 659.0 |  | 519.0 |  |  |  |  |  |  |  |  |
Retained Earnings, Accumulated Net Realized Losses |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders’ equity | (256.0) |  | (146.0) |  |  |  |  |  |  |  |  |
Retained Earnings, Accumulated Net Unrealized Gains |  |  |  |  |  |  |  |  |  |  |  |
Investments, Owned, Federal Income Tax Note [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total stockholders’ equity | $ 59.0 |  | $ (375.0) |  |  |  |  |  |  |  |  |
[1] | As of December 31, 2023, the estimated net unrealized loss for federal tax purposes was $0.4 billion based on a tax cost basis of $22.5 billion. As of December 31, 2023, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.3 billion.
[2] | As of December 31, 2022, the estimated net unrealized loss for federal tax purposes was $0.2 billion based on a tax cost basis of $22.0 billion. As of December 31, 2022, the estimated aggregate gross unrealized loss for federal income tax purposes was $1.2 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was $1.0 billion.

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