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INVESTMENTS - Credit Ratings (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 238.9	$ 169.3
Fair Value	235.5	166.8
AAA
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	65.0	53.0
Fair Value	$ 64.1	$ 52.1
AAA | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage (in percent)	27.20%	31.20%
AA+, AA, AA-, A-1
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 102.0	$ 59.4
Fair Value	$ 100.8	$ 58.8
AA+, AA, AA-, A-1 | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage (in percent)	42.80%	35.30%
A+, A, A-
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 55.2	$ 42.1
Fair Value	$ 54.0	$ 41.2
A+, A, A- | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage (in percent)	22.90%	24.70%
BBB+, BBB, BBB-
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 16.7	$ 14.8
Fair Value	$ 16.6	$ 14.7
BBB+, BBB, BBB- | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage (in percent)	7.10%	8.80%
Standard & Poor's Global Rating, Total | AFS securities | Credit rating
Debt Securities, Available-for-sale [Line Items]
Concentration percentage (in percent)	100.00%	100.00%

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