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INVESTMENTS - Schedule of Gross Realized Gains and Losses (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Gain (Loss) on Securities [Line Items] |  |
Less than 12 months, fair value | $ 28.4 | $ 51.1
Less than 12 months, unrealized losses | (0.1) | (0.7)
12 months or longer, fair value | 10.4 | 102.5
12 months or longer, unrealized losses | (0.1) | (1.6)
Total fair value | 38.9 | 153.6
Total unrealized losses | (0.2) | (2.2)
Short-term investments |  |
Gain (Loss) on Securities [Line Items] |  |
Less than 12 months, fair value | 2.6 | 0.0
Less than 12 months, unrealized losses | 0.0 | 0.0
12 months or longer, fair value | 1.1 | 6.0
12 months or longer, unrealized losses | 0.0 | (0.1)
Total fair value | 3.7 | 6.0
Total unrealized losses | 0.0 | (0.1)
U.S. Treasury |  |
Gain (Loss) on Securities [Line Items] |  |
Less than 12 months, fair value | 4.8 | 3.4
Less than 12 months, unrealized losses | 0.0 | (0.1)
12 months or longer, fair value | 1.7 | 5.0
12 months or longer, unrealized losses | 0.0 | (0.1)
Total fair value | 6.5 | 8.5
Total unrealized losses | 0.0 | (0.1)
Municipal |  |
Gain (Loss) on Securities [Line Items] |  |
Less than 12 months, fair value | 0.2 | 6.4
Less than 12 months, unrealized losses | 0.0 | (0.1)
12 months or longer, fair value | 0.0 | 10.4
12 months or longer, unrealized losses | 0.0 | (0.1)
Total fair value | 0.2 | 16.8
Total unrealized losses | 0.0 | (0.2)
Corporate |  |
Gain (Loss) on Securities [Line Items] |  |
Less than 12 months, fair value | 3.3 | 11.4
Less than 12 months, unrealized losses | 0.0 | (0.1)
12 months or longer, fair value | 4.6 | 48.0
12 months or longer, unrealized losses | 0.0 | (0.8)
Total fair value | 8.0 | 59.4
Total unrealized losses | 0.0 | (0.9)
Mortgage and other asset-backed securities |  |
Gain (Loss) on Securities [Line Items] |  |
Less than 12 months, fair value | 17.4 | 29.8
Less than 12 months, unrealized losses | (0.1) | (0.4)
12 months or longer, fair value | 3.0 | 33.1
12 months or longer, unrealized losses | 0.0 | (0.5)
Total fair value | 20.4 | 62.9
Total unrealized losses | $ (0.1) | $ (0.9)

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