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INVESTMENTS - Credit Ratings (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 137.2 |  | $ 218.4
Fair Value | $ 139.3 |  | 224.0
AFS securities | Credit rating |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Concentration percentage | 100.00% | 100.00% |
AAA |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 73.2 |  | 116.5
Fair Value | $ 74.0 |  | 118.7
AAA | AFS securities | Credit rating |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Concentration percentage | 53.10% | 53.00% |
AA+, AA, AA-, A-1 |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 17.0 |  | 22.7
Fair Value | $ 17.3 |  | 23.3
AA+, AA, AA-, A-1 | AFS securities | Credit rating |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Concentration percentage | 12.50% | 10.40% |
A+, A, A- |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 36.4 |  | 57.5
Fair Value | $ 37.1 |  | 59.4
A+, A, A- | AFS securities | Credit rating |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Concentration percentage | 26.60% | 26.50% |
BBB+, BBB, BBB- |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 10.6 |  | 21.7
Fair Value | $ 10.9 |  | $ 22.6
BBB+, BBB, BBB- | AFS securities | Credit rating |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Concentration percentage | 7.80% | 10.10% |

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