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FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jan. 01, 2021
USD ($)
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Equity securities - corporate securities $ 95.5 $ 135.3    
Market risk benefit asset 89.3 65.3 $ 56.3 $ 2.5
Market risk benefit liability 3.1 11.3 $ 13.7 $ 114.8
Significant unobservable inputs  (Level 3)        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Total assets carried at fair value by category 358.2 418.7    
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Market risk benefit asset 89.3 65.3    
Market risk benefit liability $ 3.1 $ 11.3    
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Surrender rates | Minimum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, market risk benefit, assets measurement input 0.0128 0.0128    
Unobservable inputs, market risk benefit, liability measurement input 0.0128 0.0128    
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Surrender rates | Maximum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, market risk benefit, assets measurement input 0.1105 0.1105    
Unobservable inputs, market risk benefit, liability measurement input 0.1105 0.1105    
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Surrender rates | Weighted Average        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, market risk benefit, assets measurement input 0.0368 0.0345    
Unobservable inputs, market risk benefit, liability measurement input 0.0368 0.0345    
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Utilization rates | Minimum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, market risk benefit, assets measurement input 0.0592 0.0678    
Unobservable inputs, market risk benefit, liability measurement input 0.0592 0.0678    
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Utilization rates | Maximum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, market risk benefit, assets measurement input 0.4762 0.6316    
Unobservable inputs, market risk benefit, liability measurement input 0.4762 0.6316    
Significant unobservable inputs  (Level 3) | Discounted cash flow analysis | Utilization rates | Weighted Average        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, market risk benefit, assets measurement input 0.2254 0.2009    
Unobservable inputs, market risk benefit, liability measurement input 0.2254 0.2009    
Significant unobservable inputs  (Level 3) | Recovery method | Percent of recovery expected | Minimum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, fixed maturities 0.0000 0.0000    
Unobservable inputs, equity securities 0.0000 0.0000    
Significant unobservable inputs  (Level 3) | Recovery method | Percent of recovery expected | Maximum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, fixed maturities 0.2500 0.3500    
Unobservable inputs, equity securities 1.0000 1.0000    
Significant unobservable inputs  (Level 3) | Recovery method | Percent of recovery expected | Weighted Average        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, fixed maturities 0.2500 0.3500    
Unobservable inputs, equity securities 1.0000 1.0000    
Significant unobservable inputs  (Level 3) | Market comparables | EBITDA multiples | Weighted Average        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, equity securities 10.7 8.5    
Significant unobservable inputs  (Level 3) | Unadjusted third-party price source        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Other assets $ 166.0 $ 249.0    
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Embedded derivatives related to fixed indexed annuity products $ 1,213.4 $ 1,297.0    
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rates | Minimum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, liabilities 0.0366 0.0377    
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rates | Maximum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, liabilities 0.0555 0.0548    
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rates | Weighted Average        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, liabilities 0.0520 0.0447    
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Projected portfolio yields | Minimum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, liabilities 0.0430 0.0430    
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Projected portfolio yields | Maximum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, liabilities 0.0463 0.0463    
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Projected portfolio yields | Weighted Average        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, liabilities 0.0431 0.0431    
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Surrender rates | Minimum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, liabilities 0.0190 0.0190    
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Surrender rates | Maximum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, liabilities 0.2770 0.2770    
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Surrender rates | Weighted Average        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, liabilities 0.0920 0.0920    
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fixed maturities, available for sale $ 2.7 $ 2.9    
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rates | Minimum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, fixed maturities   0.0223    
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rates | Maximum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, fixed maturities   0.0394    
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rates | Weighted Average        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, fixed maturities 0.0222 0.0225    
Significant unobservable inputs  (Level 3) | Corporate securities | Recovery method        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fixed maturities, available for sale $ 2.5 $ 3.5    
Significant unobservable inputs  (Level 3) | Corporate securities | Unadjusted purchase price        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fixed maturities, available for sale 1.5 0.5    
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discounted cash flow analysis        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fixed maturities, available for sale $ 23.6 $ 21.8    
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discounted cash flow analysis | Discount margins/rates | Minimum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, fixed maturities 0.0223 0.0250    
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discounted cash flow analysis | Discount margins/rates | Maximum        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, fixed maturities 0.0339 0.0386    
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discounted cash flow analysis | Discount margins/rates | Weighted Average        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Unobservable inputs, fixed maturities 0.0298 0.0330    
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Equity securities - corporate securities $ 0.1 $ 0.1    
Significant unobservable inputs  (Level 3) | Equity Securities | Unadjusted purchase price        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Equity securities - corporate securities 9.2 11.7    
Significant unobservable inputs  (Level 3) | Equity Securities | Market comparables        
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Equity securities - corporate securities $ 63.3 $ 63.9