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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	$ 10.4	$ 8.9	$ 20.5	$ 17.9
Cost of molecular diagnostic testing
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	0.5	0.4	0.8	0.7
Cost of pharmaceutical and clinical services
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	0.0	0.0	0.0	0.1
Research and development expense
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	1.0	1.0	3.4	2.5
Selling, general, and administrative expense
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	$ 8.9	$ 7.5	$ 16.3	$ 14.6

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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+ References

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