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Investments (Tables) | 6 Months Ended
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Jun. 30, 2022
Schedule Of Investments [Abstract] |
Schedule of Fair Value of Cash Equivalents, Long and Short Term Investments | The fair value of the cash equivalents, long-term and short-term investments are disclosed below (amounts in millions).
|  | June 30, 2022 |
|  | Investment Level |  | Amortized Cost (Carrying Value) |  |  | Gross Unrealized Holding Losses |  |  | Estimated Fair Value |
Commercial bonds and paper |  | Level 2 |  | $ | 105.0 |  |  | $ | (1.0 | ) |  | $ | 104.8 |
Money market funds |  | Level 1 |  |  | 30.5 |  |  |  | — |  |  |  | 30.5 |
U.S. Treasuries |  | Level 2 |  |  | 46.2 |  |  |  | (0.7 | ) |  |  | 45.5 |
Total cash equivalents and investments |  |  |  |  | 181.7 |  |  |  | (1.7 | ) |  |  | 180.8 |
Less cash equivalents |  |  |  |  | (30.5 | ) |  |  | — |  |  |  | (30.5 | )
Total Investments |  |  |  | $ | 151.2 |  |  | $ | (1.7 | ) |  | $ | 150.3 |
|  | December 31, 2021 |
|  | Investment Level |  | Amortized Cost (Carrying Value) |  |  | Gross Unrealized Holding Losses |  |  | Estimated Fair Value |
Commercial bonds and paper |  | Level 2 |  | $ | 115.2 |  |  | $ | 0.2 |  |  | $ | 115.0 |
Money market funds |  | Level 1 |  |  | 21.3 |  |  |  | — |  |  |  | 21.3 |
U.S. Treasuries |  | Level 2 |  |  | 23.9 |  |  |  | 0.1 |  |  |  | 23.8 |
Total cash equivalents and investments |  |  |  |  | 160.4 |  |  |  | 0.3 |  |  |  | 160.1 |
Less cash equivalents |  |  |  |  | (23.8 | ) |  |  | — |  |  |  | (23.8 | )
Total Investments |  |  |  | $ | 136.6 |  |  | $ | 0.3 |  |  | $ | 136.3 |

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