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Marketable Securities and Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2022
Fair Value Disclosures [Abstract] |
Summary of Available-for-Sale Marketable Securities | The following is a summary of the Company’s available-for-sale marketable securities measured at fair value on a recurring basis.
|  | June 30, 2022
(dollars in millions) |  | Valuation Hierarchy |  | Effective Maturity |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate bonds |  | Level 2 |  | 2022 - 2023 |  | $ | 824.5 |  |  | $ | — |  |  | $ | (8.0) |  |  | $ | 816.5 |
Corporate bonds |  | Level 2 |  | 2023 - 2025 |  | 363.3 |  |  | — |  |  | (13.0) |  |  | 350.3 |
Government securities |  | Level 2 |  | 2022 - 2023 |  | 79.9 |  |  | — |  |  | (0.8) |  |  | 79.1 |
Government securities |  | Level 2 |  | 2023 - 2024 |  | 4.3 |  |  | — |  |  | (0.2) |  |  | 4.1 |
Total |  |  |  |  |  | $ | 1,272.0 |  |  | $ | — |  |  | $ | (22.0) |  |  | $ | 1,250.0 |
|  | December 31, 2021
(dollars in millions) |  | Valuation Hierarchy |  | Effective Maturity |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate bonds |  | Level 2 |  | 2022 |  | $ | 784.0 |  |  | $ | — |  |  | $ | (0.7) |  |  | $ | 783.3 |
Corporate bonds |  | Level 2 |  | 2023 - 2024 |  | 582.5 |  |  | — |  |  | (3.8) |  |  | 578.7 |
Government securities |  | Level 2 |  | 2022 |  | 32.4 |  |  | — |  |  | (0.1) |  |  | 32.3 |
Total |  |  |  |  |  | $ | 1,398.9 |  |  | $ | — |  |  | $ | (4.6) |  |  | $ | 1,394.3 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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- References No definition available. + Details
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