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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Debt Instrument [Line Items] |  |
Outstanding principal | $ 1,336.0 | $ 1,335.6
Unamortized debt issue costs | $ (12.0) | (12.4)
6.450% Senior Notes due June 2034 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest rate | 6.45% |
Outstanding principal | $ 700.0 | 700.0
Unamortized discount on 6.450% Senior Notes due June 2034 | $ (2.0) | (2.0)
5.125% Subordinated Debentures due 2060 | Subordinated Debt |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.125% |
Outstanding principal | $ 150.0 | 150.0
5.250% Senior Notes due May 2029 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest rate | 5.25% |
Outstanding principal | $ 500.0 | $ 500.0

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