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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 14.9 | $ 36.3 | $ 25.2 | $ 33.5
Cost of molecular diagnostic testing |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 0.6 | 1.5 | 1.2 | 0.8
Cost of pharmaceutical and clinical services |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 0.1 | 0.1 | 0.3 | 0.2
Research and development expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 2.4 | 4.2 | 5.0 | 5.4
Selling, general, and administrative expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 11.8 | $ 30.5 | $ 18.7 | $ 27.1

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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 http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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