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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($)
$ in Millions
Sep. 30, 2024
May 13, 2024
Dec. 31, 2023
Debt Instrument [Line Items]      
Outstanding principal $ 1,832.9   $ 1,140.5
Unamortized debt issue costs $ (14.8)   (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