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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Jun. 30, 2020
Jun. 30, 2019
Share-Based Compensation Expense [Line Items]        
Total stock-based compensation expense $ 14.9 $ 36.3 $ 25.2 $ 33.5
Cost of molecular diagnostic testing        
Share-Based Compensation Expense [Line Items]        
Total stock-based compensation expense 0.6 1.5 1.2 0.8
Cost of pharmaceutical and clinical services        
Share-Based Compensation Expense [Line Items]        
Total stock-based compensation expense 0.1 0.1 0.3 0.2
Research and development expense        
Share-Based Compensation Expense [Line Items]        
Total stock-based compensation expense 2.4 4.2 5.0 5.4
Selling, general, and administrative expense        
Share-Based Compensation Expense [Line Items]        
Total stock-based compensation expense $ 11.8 $ 30.5 $ 18.7 $ 27.1