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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	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

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
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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