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FAIR VALUE MEASUREMENTS - FAIR VALUE INPUTS (Details) $ in Millions	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fixed maturities, available for sale	$ 23,806.6	$ 23,383.6	$ 21,293.1
Equity securities - corporate securities	149.3	151.2
Corporate securities
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fixed maturities, available for sale	15,243.5	14,739.2
Asset-backed securities
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fixed maturities, available for sale	1,012.1	1,062.1
Significant unobservable inputs  (Level 3)
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total assets carried at fair value by category	138.9	212.5
Significant unobservable inputs  (Level 3) | Unadjusted third-party price source
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Other assets	94.6	159.9
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 index annuity products	$ 1,695.0	$ 1,644.5
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rate | Minimum
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable inputs, liabilities	0.0000	0.0000
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rate | Maximum
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable inputs, liabilities	0.0330	0.0264
Significant unobservable inputs  (Level 3) | Discounted projected embedded derivatives | Discount margins/rate | Weighted Average
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable inputs, liabilities	0.0169	0.0103
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	0.0412	0.0412
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	0.0438	0.0438
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	0.0413	0.0413
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	0.0160	0.0160
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	0.2560	0.2560
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	0.0940	0.0940
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	$ 5.3	$ 13.4
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rate | Minimum
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable inputs, assets	0.0328	0.0190
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rate | Maximum
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable inputs, assets	0.0449	0.0559
Significant unobservable inputs  (Level 3) | Corporate securities | Discounted cash flow analysis | Discount margins/rate | Weighted Average
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable inputs, assets	0.0333	0.0324
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	$ 12.0	$ 12.3
Significant unobservable inputs  (Level 3) | Asset-backed securities | Discounted cash flow analysis | Discount margins/rate
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable inputs, assets	0.0170	0.0246
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Equity securities - corporate securities	$ 8.3	$ 8.3
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method | Percent of recovery expected | Minimum
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable inputs, assets		0.5927
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method | Percent of recovery expected | Maximum
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable inputs, assets		1.0000
Significant unobservable inputs  (Level 3) | Equity Securities | Recovery method | Percent of recovery expected | Weighted Average
Fair Value, Assets on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Unobservable inputs, assets	1.0000	0.5952
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	$ 18.7	$ 18.6

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