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BORROWINGS OF LONG-TERM AND OTHER DEBT - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 10, 2025 | Aug. 31, 2025 | Jun. 30, 2025 | Jan. 31, 2024 | Sep. 30, 2025 | Mar. 31, 2025 | Jan. 31, 2025 | Dec. 31, 2024 | Oct. 31, 2024 | Dec. 22, 2023 | Jun. 30, 2023 | Sep. 30, 2020
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount issued |  |  |  |  | $ 3,000,000 | $ 7,000,000 |  |  |  |  |  |
Interest Rates |  |  |  |  | 4.25% |  |  |  |  |  |  |
Repurchase amount |  |  |  |  | $ 5,000,000 | 11,000,000 |  |  |  |  |  |
Additional paid-in capital related to the induced conversion premium |  |  |  |  | 2,000,000 | 2,000,000 |  |  |  |  |  |
Long-term and other debt |  |  |  |  | 100,000 |  |  | $ 10,000,000 |  |  |  |
Convertible Debt | Other Non-interest Expense |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, inducement expense |  |  |  |  | 1,000,000 | $ 2,000,000 |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  |
Remaining borrowing capacity |  |  |  |  | 700,000,000 |  |  |  |  |  |  |
Subordinated notes due 2035 | Long-term and Other Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount issued |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Interest Rates |  |  |  |  | 8.375% |  |  |  |  |  |  |
Subordinated notes due 2035 | Subordinated Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rates |  |  |  |  | 8.38% |  |  |  |  |  |  |
Repurchase amount |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Long-term and other debt |  |  |  |  | $ 400,000,000 |  |  | 0 |  |  |  |
7.000% Senior Notes Due 2028 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rates |  |  |  |  | 7.00% |  |  |  |  |  |  |
Repurchase amount |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
4.250% Convertible Senior Notes Due 2028 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount issued |  |  |  |  |  |  |  |  |  |  | $ 316,000,000 |
Interest Rates |  |  |  |  | 4.25% |  |  |  |  |  | 4.25% |
Repurchase amount |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |
Senior notes due 2029 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount issued |  |  |  | $ 900,000,000 |  |  |  |  |  | $ 600,000,000 |  |
Interest Rates |  |  | 9.75% | 9.75% | 9.75% |  |  |  |  |  |  |
Repurchase amount |  | $ 31,000,000 | $ 150,000,000 |  | $ 31,000,000 |  |  |  |  |  |  |
Long-term and other debt |  |  |  |  | $ 719,000,000 |  |  | 900,000,000 |  |  |  |
Redemption price |  |  |  | 101.00% |  |  |  |  |  |  |  |
Principal amount per note |  | 1,000 | 1,000 |  |  |  |  |  |  |  |  |
Repurchase amount per note including accrued unpaid interest |  | 1,070 | 1,071 |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 3,000,000 | $ 13,000,000 |  |  |  |  |  |  |  |  |
Senior Notes 2029, January 2024 Issuance | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount issued |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |
Senior notes due 2026 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount issued |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Interest Rates |  |  |  |  | 7.00% |  |  |  |  |  |  | 7.00%
Repurchase amount |  |  |  | $ 400,000,000 |  |  | $ 100,000,000 |  |  |  |  |
Long-term and other debt |  |  |  |  | $ 0 |  |  | $ 100,000,000 |  |  |  |
Subordinated Note Due 2035 | Subordinated Debt |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt amount issued | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest Rates | 8.375% |  |  |  |  |  |  |  |  |  |  |
Repurchase amount | $ 100,000 |  |  |  |  |  |  |  |  |  |  |
Basis spread | 4.30% |  |  |  |  |  |  |  |  |  |  |

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