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INVESTMENTS (Tables) | 9 Months Ended
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Sep. 30, 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 are as follows:
| As of September 30, 2024
| Amortized Cost |  |  |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
| (In millions)
Short-term investments | $ | 9.0 |  |  |  |  | $ | — |  |  | $ | — |  |  | $ | 9.0 |
U.S. Treasury | 17.1 |  |  |  |  | 0.3 |  |  | — |  |  | 17.4 |
Municipal | 29.4 |  |  |  |  | 0.5 |  |  | — |  |  | 29.9 |
Corporate | 126.7 |  |  |  |  | 3.2 |  |  | — |  |  | 129.9 |
Mortgage and other asset-backed securities | 142.0 |  |  |  |  | 2.8 |  |  | (0.1) |  |  | 144.7 |
Total investments | $ | 324.1 |  |  |  |  | $ | 6.9 |  |  | $ | (0.2) |  |  | $ | 330.8 |
| 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 September 30, 2024
| Amortized Cost |  | Fair Value
| (In millions)
Due in 1 year or less | $ | 9.0 |  |  | $ | 9.0 |
Due in 1-5 years | 114.3 |  |  | 116.3 |
Due in 6-10 years | 56.2 |  |  | 58.0 |
Due after 10 years | 2.6 |  |  | 2.8 |
Total by maturity | 182.1 |  |  | 186.1 |
Mortgage and other asset-backed securities | 142.0 |  |  | 144.7 |
Total investment securities | $ | 324.1 |  |  | $ | 330.8 |
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 September 30, 2024.
| As of September 30, 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 | $ | 2.6 |  |  | $ | — |  |  | $ | 1.1 |  |  | $ | — |  |  | $ | 3.7 |  |  | $ | — |
U.S. Treasury | 4.8 |  |  | — |  |  | 1.7 |  |  | — |  |  | 6.5 |  |  | — |
Municipal | 0.2 |  |  | — |  |  | — |  |  | — |  |  | 0.2 |  |  | — |
Corporate | 3.3 |  |  | — |  |  | 4.6 |  |  | — |  |  | 8.0 |  |  | — |
Mortgage and other asset-backed securities | 17.4 |  |  | (0.1) |  |  | 3.0 |  |  | — |  |  | 20.4 |  |  | (0.1) |
Total debt securities | $ | 28.4 |  |  | $ | (0.1) |  |  | $ | 10.4 |  |  | $ | (0.1) |  |  | $ | 38.9 |  |  | $ | (0.2) |
| 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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