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INCOME TAXES - Schedule of Differences Between Statutory Federal Income Tax Rate and Income Taxes Reported (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Amount      
Federal income tax benefit at the statutory rate $ (25.9) $ (54.9) $ (29.5)
State income taxes, net of federal benefit (2.4) (4.1) (3.3)
Research and development credits (0.4) (1.6) (3.5)
Uncertain tax positions 2.8 3.7 0.6
Stock-based incentive awards 0.8 1.2 2.5
Foreign rate differential 3.3 (0.4) 0.0
Change in valuation allowance 15.7 52.6 2.6
Non-deductible officer compensation 3.9 3.0 3.5
Acquisitions and dispositions 5.1 0.1 (0.1)
Other, net 0.9 1.5 (1.4)
Total income tax expense (benefit) $ 3.8 $ 1.1 $ (28.6)
Effective Income Tax Rate Reconciliation, Percent      
Federal income tax benefit at the statutory rate 21.00% 21.00% 21.00%
State income taxes, net of federal benefit 1.90% 1.60% 2.30%
Research and development credits 0.30% 0.60% 2.50%
Uncertain tax positions (2.30%) (1.40%) (0.40%)
Stock-based incentive awards (0.60%) (0.50%) (1.80%)
Foreign rate differential (2.70%) 0.20% 0.00%
Change in valuation allowance (12.70%) (20.10%) (1.80%)
Non-deductible officer compensation (3.20%) (1.10%) (2.50%)
Acquisitions and dispositions (4.10%) 0.00% 0.10%
Other, net (0.70%) (0.70%) 0.90%
Total income tax expense (benefit) (3.10%) (0.40%) 20.30%