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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($)
$ in Millions
Dec. 31, 2024
May 13, 2024
Dec. 31, 2023
Nov. 30, 2020
Jun. 12, 2019
May 19, 2015
Debt Instrument [Line Items]            
Notes payable – direct corporate obligations $ 1,833.5   $ 1,140.5      
Unamortized debt issuance costs $ (14.3)   (9.5)      
Senior Notes | 6.450% Senior Notes due June 2034            
Debt Instrument [Line Items]            
Interest rate 6.45% 6.45%        
Notes payable – direct corporate obligations $ 700.0   0.0      
Unamortized discount on 6.450% Senior Notes due June 2034 $ (2.2)   0.0      
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      
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      
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