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INVESTMENTS - Amortized Cost and Fair Value of TCA's Investment (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Amortized Cost
Due in 1 year or less	$ 10.6
Due in 1-5 years	122.9
Due in 5-10 years	72.9
Total by maturity	206.5
Fair Value
Due in 1 year or less	10.5
Due in 1-5 years	121.6
Due in 5-10 years	72.3
Total by maturity	204.4
Amortized Cost	351.1	$ 331.6
Fair Value	348.1	332.9
Mortgage and other asset-backed securities
Fair Value
Amortized Cost	144.6	150.1
Fair Value	$ 143.7	$ 150.9

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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