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INVESTMENTS - Credit Ratings (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 132.6 | $ 218.4
Fair Value | $ 134.7 | $ 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 | $ 72.4 | $ 116.5
Fair Value | $ 73.1 | $ 118.7
AAA | AFS securities | Credit rating |  |
Debt Securities, Available-for-sale [Line Items] |  |
Concentration percentage | 54.30% | 53.00%
AA+, AA, AA-, A-1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 14.7 | $ 22.7
Fair Value | $ 15.1 | $ 23.3
AA+, AA, AA-, A-1 | AFS securities | Credit rating |  |
Debt Securities, Available-for-sale [Line Items] |  |
Concentration percentage | 11.20% | 10.40%
A+, A, A- |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 34.4 | $ 57.5
Fair Value | $ 35.1 | $ 59.4
A+, A, A- | AFS securities | Credit rating |  |
Debt Securities, Available-for-sale [Line Items] |  |
Concentration percentage | 26.10% | 26.50%
BBB+, BBB, BBB- |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 11.1 | $ 21.7
Fair Value | $ 11.4 | $ 22.6
BBB+, BBB, BBB- | AFS securities | Credit rating |  |
Debt Securities, Available-for-sale [Line Items] |  |
Concentration percentage | 8.40% | 10.10%

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