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INVESTMENTS - Unrealized Losses (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | $ 35.9 | $ 29.6
Less than 12 Months, Unrealized Loss | (0.3) | (0.1)
12 Months or More, Fair Value | 0.3 | 0.0
12 Months or More, Unrealized Loss | 0.0 | 0.0
Total, Fair Value | 36.2 | 29.6
Total, Unrealized Loss | (0.3) | (0.1)
U.S. Treasury securities and agencies |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 14.0 | 15.7
Less than 12 Months, Unrealized Loss | (0.1) | 0.0
12 Months or More, Fair Value | 0.0 | 0.0
12 Months or More, Unrealized Loss | 0.0 | 0.0
Total, Fair Value | 14.0 | 15.7
Total, Unrealized Loss | (0.1) | 0.0
Municipal securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 6.4 | 2.3
Less than 12 Months, Unrealized Loss | 0.0 | 0.0
12 Months or More, Fair Value | 0.0 | 0.0
12 Months or More, Unrealized Loss | 0.0 | 0.0
Total, Fair Value | 6.4 | 2.3
Total, Unrealized Loss | 0.0 | 0.0
Corporate debt securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 8.1 | 2.9
Less than 12 Months, Unrealized Loss | (0.1) | (0.1)
12 Months or More, Fair Value | 0.0 | 0.0
12 Months or More, Unrealized Loss | 0.0 | 0.0
Total, Fair Value | 8.1 | 2.9
Total, Unrealized Loss | (0.1) | (0.1)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 4.3 | 3.7
Less than 12 Months, Unrealized Loss | (0.1) | 0.0
12 Months or More, Fair Value | 0.3 | 0.0
12 Months or More, Unrealized Loss | 0.0 | 0.0
Total, Fair Value | 4.6 | 3.7
Total, Unrealized Loss | (0.1) | 0.0
Commercial mortgage backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value | 3.1 | 4.9
Less than 12 Months, Unrealized Loss | 0.0 | 0.0
12 Months or More, Fair Value | 0.0 | 0.0
12 Months or More, Unrealized Loss | 0.0 | 0.0
Total, Fair Value | 3.1 | 4.9
Total, Unrealized Loss | $ 0.0 | 0.0
Other debt obligations |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Less than 12 Months, Fair Value |  | 0.1
Less than 12 Months, Unrealized Loss |  | 0.0
12 Months or More, Fair Value |  | 0.0
12 Months or More, Unrealized Loss |  | 0.0
Total, Fair Value |  | 0.1
Total, Unrealized Loss |  | $ 0.0

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