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INVESTMENTS - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale | $ 219.7 | $ 11.4 | $ 271.8 | $ 41.3 |
Available-for-sale Securities, Gross Realized Gains | $ 2.5 | 0.1 | 3.1 | 0.1 |
Available-for-sale Securities, Gross Realized Losses |  | $ 0.1 | $ 3.5 | $ 0.1 |
NumberOfSecuritiesInSecurityPortfolio | 1,416 |  | 1,416 |  | 1,351
NumberOfSecuritiesInUnrealizedLossPosition | 200 |  | 200 |  | 94
Debt Securities, Held-to-maturity, Nonaccrual | $ 0.0 |  | $ 0.0 |  | $ 0.0
Debt Securities, Held-to-maturity, Allowance for Credit Loss | $ 0.0 |  | $ 0.0 |  | $ 0.0

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