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INVESTMENTS - Credit Ratings (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 132.9 | $ 129.5
Fair Value | $ 129.6 | $ 129.9
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 | $ 72.6 | $ 70.9
Fair Value | $ 70.8 | $ 70.8
AAA | AFS securities | Credit rating |  |
Debt Securities, Available-for-sale [Line Items] |  |
Concentration percentage | 54.60% | 54.50%
AA+, AA, AA-, A-1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 15.9 | $ 14.7
Fair Value | $ 15.5 | $ 14.8
AA+, AA, AA-, A-1 | AFS securities | Credit rating |  |
Debt Securities, Available-for-sale [Line Items] |  |
Concentration percentage | 12.00% | 11.40%
A+, A, A- |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 34.7 | $ 33.4
Fair Value | $ 33.7 | $ 33.6
A+, A, A- | AFS securities | Credit rating |  |
Debt Securities, Available-for-sale [Line Items] |  |
Concentration percentage | 26.00% | 25.90%
BBB+, BBB, BBB- |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 9.7 | $ 10.5
Fair Value | $ 9.6 | $ 10.7
BBB+, BBB, BBB- | AFS securities | Credit rating |  |
Debt Securities, Available-for-sale [Line Items] |  |
Concentration percentage | 7.40% | 8.20%

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