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INVESTMENTS - Amortized Cost and Fair Value of TCA's Investment (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost
Due in 1 year or less	$ 0.9
Due in 1-5 years	122.0
Due in 5-10 years	53.3
Due after 10 years	2.1
Total by maturity	178.3
Fair Value
Due in 1 year or less	0.9
Due in 1-5 years	124.3
Due in 5-10 years	54.8
Due after 10 years	2.1
Total by maturity	182.1
Amortized Cost	407.0	$ 349.8
Fair Value	413.4	348.6
Mortgage and other asset-backed securities
Fair Value
Amortized Cost	228.8	170.1
Fair Value	$ 231.3	$ 169.1

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