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INVESTMENTS - Carrying Amounts of Investments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 324.1	$ 331.6
Gross Unrealized Gains	6.9	3.5
Gross Unrealized Losses	(0.2)	(2.2)
Fair Value	330.8	332.9
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9.0	6.3
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	(0.1)
Fair Value	9.0	6.2
U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17.1	13.6
Gross Unrealized Gains	0.3	0.1
Gross Unrealized Losses	0.0	(0.1)
Fair Value	17.4	13.5
Municipal
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29.4	30.1
Gross Unrealized Gains	0.5	0.2
Gross Unrealized Losses	0.0	(0.2)
Fair Value	29.9	30.1
Corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	126.7	131.5
Gross Unrealized Gains	3.2	1.6
Gross Unrealized Losses	0.0	(0.9)
Fair Value	129.9	132.2
Mortgage and other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	142.0	150.1
Gross Unrealized Gains	2.8	1.6
Gross Unrealized Losses	(0.1)	(0.9)
Fair Value	$ 144.7	$ 150.9

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