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INCOME TAXES - NARRATIVE (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Operating Loss Carryforwards [Line Items]      
Impact of change in tax method of accounting     $ 797.6
Deferred tax assets more likely than not to be realized through future taxable earnings $ 731.8 $ 711.7  
Federal long-term tax exempt rate 3.58%    
Ownership change threshold restricting NOL usage 50.00%    
Net state operating loss carryforwards $ 38.0 38.0  
Capital loss carryforward 55.9 $ 53.7  
NOLs with no expiration date      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 1,015.8    
NOLs with no expiration date | Non-Life      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 848.3    
NOLs with no expiration date | Life      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 167.5