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INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Carrying Amounts of Investment Securities and Fair Values

The amortized cost, gross unrealized gains and losses and estimated fair values of debt securities available-for-sale and other investments measured at net asset value are as follows:

			As of December 31, 2024
			Amortized Cost												Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
			(In millions)
Short-term investments			$	14.4											$	—					$	—					$	14.4
U.S Treasury			2.6												—						—						2.6
Municipal			10.6												0.1						(0.1)						10.6
Corporate			152.0												0.8						(0.9)						151.9
Mortgage and other asset-backed securities			170.1												0.6						(1.7)						169.1
Total investments			$	349.8											$	1.6					$	(2.7)					$	348.6

			As of December 31, 2023
			Amortized Cost												Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
			(In millions)
Short-term investments			$	6.3											$	—					$	(0.1)					$	6.2
U.S Treasury			13.6												0.1						(0.1)						13.5
Municipal			30.1												0.2						(0.2)						30.1
Corporate			131.5												1.6						(0.9)						132.2
Mortgage and other asset-backed securities			150.1												1.6						(0.9)						150.9
Total investments			$	331.6											$	3.5					$	(2.2)					$	332.9

Schedule of Amortized Cost and Fair Value of TCA's Investment

A summary of amortized costs and fair value of investments by time to maturity, is as follows:

			As of December 31, 2024
			Amortized Costs						Fair Value
			(In millions)
Due in 1 year or less			$	14.4					$	14.4
Due in 1-5 years			108.5						108.6
Due in 6-10 years			54.7						54.5
Due after 10 years			2.0						2.0
Total by maturity			179.6						179.5
Mortgage and other asset-backed securities			170.1						169.1
Total investment securities			$	349.8					$	348.6

Schedule of Unrealized Loss on Investments

The following tables summarize the amount of unrealized losses, defined as the amount by which the amortized cost exceeds fair value, and the related fair value of investments with unrealized losses. The investments were segregated into two categories: those that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position of 12 or more months. The reference point for determining how long an investment was in an unrealized loss position was December 31, 2024.

			As of December 31, 2024
			Less than 12 Months												Greater than 12 Months												Total
			Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
			(In millions)
Short-term investments			$	0.3					$	—					$	3.9					$	—					$	4.1					$	—
U.S Treasury			1.1						—						1.4						—						2.5						—
Municipal			3.4						(0.1)						1.6						—						4.9						(0.1)
Corporate			64.3						(0.5)						26.6						(0.4)						90.9						(0.9)
Mortgage and other asset-backed securities			78.5						(1.0)						26.4						(0.7)						104.9						(1.7)
Total debt securities			$	147.5					$	(1.6)					$	59.8					$	(1.2)					$	207.3					$	(2.7)

			As of December 31, 2023
			Less than 12 Months												Greater than 12 Months												Total
			Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
			(In millions)
Short-term investments			$	—					$	—					$	6.0					$	(0.1)					$	6.0					$	(0.1)
U.S Treasury			3.4						(0.1)						5.0						(0.1)						8.5						(0.1)
Municipal			6.4						(0.1)						10.4						(0.1)						16.8						(0.2)
Corporate			11.4						(0.1)						48.0						(0.8)						59.4						(0.9)
Mortgage and other asset-backed securities			29.8						(0.4)						33.1						(0.5)						62.9						(0.9)
Total debt securities			$	51.1					$	(0.7)					$	102.5					$	(1.6)					$	153.6					$	(2.2)

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- Definition

Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

+ References

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- Definition

Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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- Definition

For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-6

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