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INVESTMENTS - Amortized Cost and Fair Value of TCA's Investment (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Amortized Cost
Due in 1 year or less	$ 6.6
Due in 1-5 years	103.6
Due in 5-10 years	49.9
Due after 10 years	2.8
Total by maturity	162.9
Fair Value
Due in 1 year or less	6.6
Due in 1-5 years	104.7
Due in 5-10 years	50.4
Due after 10 years	2.8
Total by maturity	164.5
Amortized Cost	362.7	$ 349.8
Fair Value	365.4	348.6
Mortgage and other asset-backed securities
Fair Value
Amortized Cost	199.8	170.1
Fair Value	$ 200.9	$ 169.1

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