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MARKETABLE INVESTMENT SECURITIES - Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Cash and cash equivalents: |  |  |
Amortized cost | $ 53.6 | $ 56.9 | $ 164.2
Estimated fair value | 53.6 | 56.9 |
Total |  |  |
Amortized cost | 110.6 | 172.4 |
Gross unrealized holding gains | 0.0 | 0.0 |
Gross unrealized holding losses | (1.5) | (2.7) |
Estimated fair value | 109.1 | 169.7 |
Corporate bonds and notes |  |  |
Available-for-sale: |  |  |
Amortized cost | 29.3 | 66.7 |
Gross unrealized holding gains | 0.0 | 0.0 |
Gross unrealized holding losses | (0.9) | (1.6) |
Estimated fair value | 28.4 | 65.1 |
Municipal bonds |  |  |
Available-for-sale: |  |  |
Amortized cost | 8.7 | 16.3 |
Gross unrealized holding gains | 0.0 | 0.0 |
Gross unrealized holding losses | (0.1) | (0.3) |
Estimated fair value | 8.6 | 16.0 |
Federal agency issues |  |  |
Available-for-sale: |  |  |
Amortized cost | 14.5 | 20.7 |
Gross unrealized holding gains | 0.0 | 0.0 |
Gross unrealized holding losses | (0.4) | (0.7) |
Estimated fair value | 14.1 | 20.0 |
U.S. government securities |  |  |
Available-for-sale: |  |  |
Amortized cost | 4.5 | 11.8 |
Gross unrealized holding gains | 0.0 | 0.0 |
Gross unrealized holding losses | (0.1) | (0.1) |
Estimated fair value | 4.4 | 11.7 |
Cash |  |  |
Cash and cash equivalents: |  |  |
Amortized cost | 51.9 | 53.6 |
Estimated fair value | 51.9 | 53.6 |
Cash equivalents |  |  |
Cash and cash equivalents: |  |  |
Amortized cost | 1.7 | 3.3 |
Estimated fair value | $ 1.7 | $ 3.3 |

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