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INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2025

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 are as follows:

			As of March 31, 2025
			Amortized Cost												Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
			(In millions)
Short-term investments			$	6.6											$	—					$	—					$	6.6
U.S. Treasury			1.6												—						—						1.6
Municipal			4.8												0.1						—						4.9
Corporate			149.9												1.7						(0.1)						151.4
Mortgage and other asset-backed securities			199.8												1.8						(0.7)						200.9
Total investments			$	362.7											$	3.6					$	(0.8)					$	365.4

			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

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 March 31, 2025
			Amortized Cost						Fair Value
			(In millions)
Due in 1 year or less			$	6.6					$	6.6
Due in 1-5 years			103.6						104.7
Due in 6-10 years			49.9						50.4
Due after 10 years			2.8						2.8
Total by maturity			162.9						164.5
Mortgage and other asset-backed securities			199.8						200.9
Total investment securities			$	362.7					$	365.4

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 for 12 or more months. The reference point for determining how long an investment was in an unrealized loss position was March 31, 2025.

			As of March 31, 2025
			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			$	—					$	—					$	2.1					$	—					$	2.1					$	—
U.S. Treasury			—						—						0.8						—						0.8						—
Municipal			—						—						1.4						—						1.4						—
Corporate			11.3						(0.1)						6.0						(0.1)						17.4						(0.1)
Mortgage and other asset-backed securities			38.2						(0.2)						22.5						(0.4)						60.6						(0.7)
Total debt securities			$	49.5					$	(0.3)					$	32.9					$	(0.6)					$	82.4					$	(0.8)

			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)

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- Definition

Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
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-Name Accounting Standards Codification
-Section 55
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-4

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