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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Outstanding principal	$ 1,834.2	$ 1,833.5
Unamortized debt issue costs	$ (13.6)	(14.3)
Senior Notes | 6.450% Senior Notes due June 2034
Debt Instrument [Line Items]
Interest rate	6.45%
Outstanding principal	$ 700.0	700.0
Unamortized discount on 6.450% Senior Notes due June 2034	$ (2.2)	(2.2)
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 | 5.250% Senior Notes due May 2025
Debt Instrument [Line Items]
Interest rate	5.25%
Outstanding principal	$ 500.0	500.0
Subordinated Debt | 5.125% Subordinated Debentures due 2060
Debt Instrument [Line Items]
Interest rate	5.125%
Outstanding principal	$ 150.0	$ 150.0

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