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Segment and Related Information - Assets by Geographical Region (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
Cash, cash equivalents, and marketable investment securities	171.7	254.8	191.8
Total assets	1,418.8	1,404.6	1,562.7
Reportable geographical components
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	40.7	37.0	57.3
Total assets by segment and geographical region	1,247.1	1,149.8	1,370.9
Reportable geographical components | United States
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	38.4	35.4	36.0
Total assets by segment and geographical region	1,190.3	1,097.2	1,265.8
Reportable geographical components | Rest of world
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	2.3	1.6	21.3
Total assets by segment and geographical region	$ 56.8	$ 52.6	$ 105.1

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Assets, Less Cash, Cash Equivalents, And Investments

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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