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Segment and Related Information - Balance Sheet Assets By Operating Segment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	$ 40.7	$ 37.0	$ 57.3
Reportable segments
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	40.7	37.0	57.3
Total assets less cash, cash equivalents, and marketable investment securities	1,247.1	1,149.8	1,370.9
Reportable segments | Diagnostic
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	23.0	23.9	25.7
Total assets less cash, cash equivalents, and marketable investment securities	994.0	1,002.8	1,215.6
Reportable segments | Other
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	17.7	13.1	31.6
Total assets less cash, cash equivalents, and marketable investment securities	$ 253.1	$ 147.0	$ 155.3

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Assets, Less Cash, Cash Equivalents, And Investments

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