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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS - SCHEDULE OF LONG-TERM DEBT INSTRUMENTS (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Notes payable – direct corporate obligations $ 1,136.9 $ 1,136.2
Unamortized debt issue costs $ (13.1) (13.8)
Senior Notes | 5.250% Senior Notes due May 2025    
Debt Instrument [Line Items]    
Interest rate 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%  
Notes payable – direct corporate obligations $ 500.0 500.0
Subordinated Debt | 5.125% Subordinated Debentures due November 2060    
Debt Instrument [Line Items]    
Interest rate 5.125%  
Notes payable – direct corporate obligations $ 150.0 150.0
Revolving Credit Agreement | Revolving Credit Facility    
Debt Instrument [Line Items]    
Notes payable – direct corporate obligations $ 0.0 $ 0.0