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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 8.9 | $ 1.9 | $ 17.9 | $ 9.4
Cost of molecular diagnostic testing |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 0.4 | 0.3 | 0.7 | 0.7
Cost of pharmaceutical and clinical services |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 0.0 | 0.1 | 0.1 | 0.2
Research and development expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | 1.0 | 1.2 | 2.5 | 2.3
Selling, general, and administrative expense |  |  |  |
Share-Based Compensation Expense [Line Items] |  |  |  |
Total stock-based compensation expense | $ 7.5 | $ 0.3 | $ 14.6 | $ 6.2

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