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INVESTMENTS - Amortized Cost and Fair Value of TCA's Investment (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Amortized Cost
Due in 1 year or less	$ 9.0
Due in 1-5 years	114.3
Due in 5-10 years	56.2
Due after 10 years	2.6
Total by maturity	182.1
Fair Value
Due in 1 year or less	9.0
Due in 1-5 years	116.3
Due in 5-10 years	58.0
Due after 10 years	2.8
Total by maturity	186.1
Amortized Cost	324.1	$ 331.6
Fair Value	330.8	332.9
Mortgage and other asset-backed securities
Fair Value
Amortized Cost	142.0	150.1
Fair Value	$ 144.7	$ 150.9

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