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v3.23.1

Marketable Securities and Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2023
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.
|  | March 31, 2023
(dollars in millions) |  | Valuation Hierarchy |  |  |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate bonds |  | Level 2 |  |  |  | $ | 688.8 |  |  | $ | — |  |  | $ | (6.4) |  |  | $ | 682.4 |
Corporate bonds |  | Level 2 |  |  |  | 206.3 |  |  | 0.1 |  |  | (6.0) |  |  | 200.4 |
Government securities |  | Level 2 |  |  |  | 56.1 |  |  | — |  |  | (0.1) |  |  | 56.0 |
Government securities |  | Level 2 |  |  |  | 54.7 |  |  | 0.1 |  |  | (0.3) |  |  | 54.5 |
Total |  |  |  |  |  | $ | 1,005.9 |  |  | $ | 0.2 |  |  | $ | (12.8) |  |  | $ | 993.3 |
|  | December 31, 2022
(dollars in millions) |  | Valuation Hierarchy |  |  |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate bonds |  | Level 2 |  |  |  | $ | 802.7 |  |  | $ | — |  |  | $ | (9.3) |  |  | $ | 793.4 |
Corporate bonds |  | Level 2 |  |  |  | 205.3 |  |  | — |  |  | (9.2) |  |  | 196.1 |
Government securities |  | Level 2 |  |  |  | 61.9 |  |  | — |  |  | (0.4) |  |  | 61.5 |
Government securities |  | Level 2 |  |  |  | 73.3 |  |  | — |  |  | (0.3) |  |  | 73.0 |
Total |  |  |  |  |  | $ | 1,143.2 |  |  | $ | — |  |  | $ | (19.2) |  |  | $ | 1,124.0 |

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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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