INVESTMENTS - Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 37.0
Due after one year through five years	174.2
Due five years through 10 years	30.2
Due after 10 years	31.3
Amortized Cost	272.7	$ 169.3
Fair Value
Due in one year or less	36.9
Due after one year through five years	175.8
Due five years through 10 years	30.8
Due after 10 years	31.3
Total	$ 274.8	$ 166.8