Contractual interest rate for funds borrowed, under the debt agreement.

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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Nov. 30, 2020	Jun. 12, 2019	May 19, 2015
Debt Instrument [Line Items]
Notes payable – direct corporate obligations	$ 1,138.8	$ 1,137.3
Unamortized debt issuance costs	$ (11.2)	(12.7)
Senior Notes \| 5.250% Senior Notes due May 2025
Debt Instrument [Line Items]
Interest rate	5.25%				5.25%
Notes payable – direct corporate obligations	$ 500.0	500.0
Senior Notes \| 5.250% Senior Notes due May 2029
Debt Instrument [Line Items]
Interest rate	5.25%			5.25%
Notes payable – direct corporate obligations	$ 500.0	500.0
Subordinated Debt \| 5.125% Subordinated Debentures due 2060
Debt Instrument [Line Items]
Interest rate	5.125%		5.125%
Notes payable – direct corporate obligations	$ 150.0	150.0
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Notes payable – direct corporate obligations	$ 0.0	$ 0.0