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Segment and Related Information (Tables) | 12 Months Ended
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Dec. 31, 2021
Segment Reporting [Abstract] |
Schedule of Assets by Geographical Region | The following table reconciles assets by geographical region to total assets:
| December 31,
(in millions) | 2021 |  | 2020
Net equipment, leasehold improvements and property: |  |  |
United States | $ | 41.7 |  |  | $ | 38.4 |
Rest of world | 1.9 |  |  | 2.3 |
Total | $ | 43.6 |  |  | $ | 40.7 |
Total assets: |  |  |
United States | $ | 870.8 |  |  | $ | 1,190.3 |
Rest of world | 51.1 |  |  | 56.8 |
Total | $ | 921.9 |  |  | $ | 1,247.1 |
Cash, cash equivalents, and marketable investment securities | 398.8 |  |  | 171.7 |
Total | $ | 1,320.7 |  |  | $ | 1,418.8 |

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- Definition Tabular disclosure of long-lived assets, excluding financial instruments, long-term customer relationships of a financial institution, mortgage rights, deferred policy acquisition costs, and deferred tax assets, by geographic areas located in the entity's country of domicile and foreign countries in which the entity holds assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9038-108599 + Details
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- References No definition available. + Details
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