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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	$ 10.1	$ 9.0
Cost of molecular diagnostic testing
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	0.3	0.3
Cost of pharmaceutical and clinical services
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	0.0	0.1
Research and development expense
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	2.4	1.5
Selling, general, and administrative expense
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	$ 7.4	$ 7.1

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809

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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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