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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($) $ in Millions | Jun. 30, 2024 | May 13, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Outstanding principal | $ 1,832.3 |  | $ 1,140.5
Unamortized debt issue costs | $ (15.4) |  | (9.5)
Senior Notes | 5.250% Senior Notes due May 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 5.25% |  |
Outstanding principal | $ 500.0 |  | 500.0
Senior Notes | 5.250% Senior Notes due May 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 5.25% |  |
Outstanding principal | $ 500.0 |  | 500.0
Senior Notes | 6.450% Senior Notes due June 2034 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 6.45% | 6.45% |
Outstanding principal | $ 700.0 |  | 0.0
Unamortized discount on 6.450% Senior Notes due June 2034 | $ (2.3) |  | 0.0
Subordinated Debt | 5.125% Subordinated Debentures due November 2060 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 5.125% |  |
Outstanding principal | $ 150.0 |  | 150.0
Revolving Credit Agreement | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding principal | $ 0.0 |  | $ 0.0

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