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Segment and Related Information - Assets by Geographical Region (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	$ 43.5	$ 40.7
Cash, cash equivalents, and marketable investment securities	398.8	171.7
Total assets	1,320.7	1,418.8
Reportable geographical components
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	43.6	40.7
Total	921.9	1,247.1
Reportable geographical components | United States
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	41.7	38.4
Total	870.8	1,190.3
Reportable geographical components | Rest of world
Segment Reporting Information [Line Items]
Net equipment, leasehold improvements and property	1.9	2.3
Total	$ 51.1	$ 56.8

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