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STOCK-BASED COMPENSATION - Schedule of Stock-Based Compensation Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-Based Compensation Expense [Line Items]      
Total stock-based compensation expense $ 40.7 $ 38.1 $ 36.3
Cost of testing revenue      
Share-Based Compensation Expense [Line Items]      
Total stock-based compensation expense 1.4 1.7 1.5
Cost of other revenue      
Share-Based Compensation Expense [Line Items]      
Total stock-based compensation expense 0.0 0.0 0.1
Research and development expense      
Share-Based Compensation Expense [Line Items]      
Total stock-based compensation expense 4.0 5.2 4.2
Selling, general, and administrative expense      
Share-Based Compensation Expense [Line Items]      
Total stock-based compensation expense $ 35.3 $ 31.2 $ 30.5