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Segment and Related Information
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Segment and Related Information SEGMENT AND RELATED INFORMATION
The Company’s business is aligned with how the chief operating decision maker ("CODM") reviews performance and makes decisions in managing the Company. On July 1, 2021, the Company completed the divestiture of Myriad RBM, Inc., and, as a result, now operates a single reporting segment. Prior to the sale, the Myriad RBM, Inc. operating segment was included in the Company’s previously reported other segment. The Company’s remaining operating segments have been aggregated into a single reporting segment, which primarily provides testing and collaborative development of testing that is designed to assess an individual’s risk for developing disease later in life, identify a patient’s likelihood of responding to drug therapy and guide a patient’s dosing to ensure optimal treatment, or assess a patient’s risk of disease progression, and includes corporate services such as finance, human resources, legal and information technology. Segment information is consistent with how management reviews the business, makes investing and resource allocation decisions and assesses operating performance. The CODM evaluates segment performance based on operating income (loss).
The following table reconciles assets by geographical region to total assets:
December 31,
(in millions)20212020
Net equipment, leasehold improvements and property:
United States$41.7 $38.4 
Rest of world1.9 2.3 
Total$43.6 $40.7 
Total assets:
United States$870.8 $1,190.3 
Rest of world51.1 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