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INCOME TAXES - NARRATIVE (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Operating Loss Carryforwards [Line Items]    
Impact of change in tax method of accounting $ 985.0  
Depreciable life of self-constructed assets 39 years  
Deferred tax assets more likely than not to be realized through future taxable earnings $ 775.8 $ 937.1
Loss limitation based on income of life insurance company, percent 35.00%  
Loss limitation based on loss of non-life entities, percent 35.00%  
Federal long-term tax exempt rate 3.49%  
Ownership change threshold restricting NOL usage 50.00%  
Net state operating loss carryforwards $ 38.4 $ 2.5
Federal    
Operating Loss Carryforwards [Line Items]    
Net federal operating loss carryforwards $ 1,100.0