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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Investments in Debt Securities | Investments in debt securities at the end of each period were as follows (in millions):
| June 30, 2024 |  | December 31, 2023
Held-to-maturity | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses | Fair Value
Bank time deposits | $ | 53.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 53.4 |  |  | $ | 64.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 64.5 |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government and agency securities | 48.5 |  |  | — |  |  | (2.0) |  |  | 46.5 |  |  | 72.7 |  |  | 0.1 |  |  | (2.8) |  |  | 70.0 |
Asset-backed securities | 110.8 |  |  | — |  |  | (2.7) |  |  | 108.1 |  |  | 192.1 |  |  | — |  |  | (7.8) |  |  | 184.3 |
Corporate debt securities | 372.2 |  |  | 0.1 |  |  | (8.0) |  |  | 364.3 |  |  | 658.5 |  |  | — |  |  | (16.7) |  |  | 641.8 |
Municipal securities | 2.8 |  |  | — |  |  | (0.1) |  |  | 2.7 |  |  | 2.8 |  |  | — |  |  | (0.2) |  |  | 2.6 |
Total | $ | 534.3 |  |  | $ | 0.1 |  |  | $ | (12.8) |  |  | $ | 521.6 |  |  | $ | 926.1 |  |  | $ | 0.1 |  |  | $ | (27.5) |  |  | $ | 898.7 |
Schedule of Cost and Fair Value of Investments in Debt Securities, by Contractual Maturity | The cost and fair value of investments in debt securities, by contractual maturity, as of June 30, 2024, were as follows:
| Held-to-Maturity |  | Available-for-Sale
| Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
| (in millions)
Due in 1 year or less | $ | 53.4 |  |  | $ | 53.4 |  |  | $ | 295.9 |  |  | $ | 291.9 |
Due after 1 year through 5 years | — |  |  | — |  |  | 114.8 |  |  | 110.4 |
Instruments not due at a single maturity date (a) | — |  |  | — |  |  | 123.6 |  |  | 119.3 |
| $ | 53.4 |  |  | $ | 53.4 |  |  | $ | 534.3 |  |  | $ | 521.6 |
_______________________________________ (a) Consists of mortgage-backed and asset-backed securities.
Schedule of Gross Unrealized Losses and Fair Values for Investments in Unrealized Loss Position | The following tables present gross unrealized losses and fair values for those investments that were in an unrealized loss position as of June 30, 2024 and December 31, 2023, aggregated by investment category and the length of time that individual securities have been in a continuous loss position (in millions):
| June 30, 2024
| Less than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. government and agency securities | $ | — |  |  | $ | — |  |  | $ | 44.8 |  |  | $ | (2.0) |  |  | $ | 44.8 |  |  | $ | (2.0) |
Asset-backed securities | 5.1 |  |  | (0.1) |  |  | 101.8 |  |  | (2.6) |  |  | 106.9 |  |  | (2.7) |
Corporate debt securities | — |  |  | — |  |  | 283.4 |  |  | (8.0) |  |  | 283.4 |  |  | (8.0) |
Municipal securities | — |  |  | — |  |  | 2.7 |  |  | (0.1) |  |  | 2.7 |  |  | (0.1) |
| $ | 5.1 |  |  | $ | (0.1) |  |  | $ | 432.7 |  |  | $ | (12.7) |  |  | $ | 437.8 |  |  | $ | (12.8) |
| December 31, 2023
| Less than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. government and agency securities | $ | — |  |  | $ | — |  |  | $ | 67.1 |  |  | $ | (2.8) |  |  | $ | 67.1 |  |  | $ | (2.8) |
Asset-backed securities | 10.2 |  |  | (1.8) |  |  | 172.7 |  |  | (6.0) |  |  | 182.9 |  |  | (7.8) |
Corporate debt securities | 25.0 |  |  | (0.1) |  |  | 601.3 |  |  | (16.6) |  |  | 626.3 |  |  | (16.7) |
Municipal securities | — |  |  | — |  |  | 2.6 |  |  | (0.2) |  |  | 2.6 |  |  | (0.2) |
| $ | 35.2 |  |  | $ | (1.9) |  |  | $ | 843.7 |  |  | $ | (25.6) |  |  | $ | 878.9 |  |  | $ | (27.5) |
Schedule of Investments in Unconsolidated Affiliates | These investments are recorded in Long-term Investments on the consolidated condensed balance sheets, and are as follows:
| June 30, 2024 |  | December 31, 2023
| (in millions)
Equity method investments |  |  |
Carrying value of equity method investments | $ | 34.0 |  |  | $ | 33.6 |
Equity securities |  |  |
Carrying value of non-marketable equity securities | 89.6 |  |  | 87.6 |
Total investments in unconsolidated entities | $ | 123.6 |  |  | $ | 121.2 |

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