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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, 2022
Dec. 31, 2021
Jun. 30, 2020
Share-Based Compensation Expense [Line Items]        
Total stock-based compensation expense $ 14.9 $ 38.1 $ 36.3 $ 25.2
Cost of testing revenue        
Share-Based Compensation Expense [Line Items]        
Total stock-based compensation expense 0.6 1.7 1.5 1.2
Cost of other revenue        
Share-Based Compensation Expense [Line Items]        
Total stock-based compensation expense 0.1 0.0 0.1 0.3
Research and development expense        
Share-Based Compensation Expense [Line Items]        
Total stock-based compensation expense 2.4 5.2 4.2 5.0
Selling, general, and administrative expense        
Share-Based Compensation Expense [Line Items]        
Total stock-based compensation expense $ 11.8 $ 31.2 $ 30.5 $ 18.7