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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2020
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 14.9 | $ 38.1 | $ 36.3 | $ 25.2
Cost of testing revenue |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 0.6 | 1.7 | 1.5 | 1.2
Cost of other revenue |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 0.1 | 0.0 | 0.1 | 0.3
Research and development expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 2.4 | 5.2 | 4.2 | 5.0
Selling, general, and administrative expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 11.8 | $ 31.2 | $ 30.5 | $ 18.7

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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