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Share-Based Compensation - Share-Based Compensation Expense (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Share-Based Compensation Expense [Line Items]
Total share-based compensation expense	$ 14.9	$ 25.2	$ 33.5	$ 27.1
Cost of molecular diagnostic testing
Share-Based Compensation Expense [Line Items]
Total share-based compensation expense	0.6	1.2	0.8	0.7
Cost of pharmaceutical and clinical services
Share-Based Compensation Expense [Line Items]
Total share-based compensation expense	0.1	0.3	0.2	0.2
Research and development expense
Share-Based Compensation Expense [Line Items]
Total share-based compensation expense	2.4	5.0	5.4	4.3
Selling, general, and administrative expense
Share-Based Compensation Expense [Line Items]
Total share-based compensation expense	$ 11.8	$ 18.7	$ 27.1	$ 21.9

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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