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SIGNIFICANT ACCOUNTING POLICIES - Out of Period Adjustment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net investment income (loss) $ 4,320.0 $ 3,315.0 $ 3,846.0
Accumulated other comprehensive income (loss) 7,777.0 $ 8,992.0  
Revision of Prior Period Adjustments      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Net investment income (loss) 46.4    
Accumulated other comprehensive income (loss) $ 46.4