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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	$ 9.4	$ 10.0	$ 29.9	$ 27.9
Cost of molecular diagnostic testing
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	0.5	0.4	1.3	1.1
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	0.8	4.4	3.3
Selling, general, and administrative expense
Share-Based Compensation Expense [Line Items]
Total stock-based compensation expense	$ 7.9	$ 8.8	$ 24.2	$ 23.4

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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