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ACCOUNTING FOR DERIVATIVES - SCHEDULE PRE-TAX GAINS (LOSSES) RECOGNIZED IN NET INCOME FOR DERIVATIVE INSTRUMENTS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative [Line Items]        
Gains (losses) on derivatives not designated as hedging instruments $ 17.1 $ 148.0 $ 221.2 $ (71.4)
Net investment income (loss) from policyholder and other special-purpose portfolios | Fixed index call options        
Derivative [Line Items]        
Gains (losses) on derivatives not designated as hedging instruments 76.0 54.0 119.6 (82.7)
Net realized gains (losses) | Embedded derivative | Coinsurance agreements        
Derivative [Line Items]        
Gains (losses) on derivatives not designated as hedging instruments 1.8 6.1 (1.2) 0.1
Insurance policy benefits | Embedded derivative | Fixed index annuities        
Derivative [Line Items]        
Gains (losses) on derivatives not designated as hedging instruments $ (60.7) $ 87.9 $ 102.8 $ 11.2