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Income Taxes - Statutory Federal Income Tax Rate and Income Taxes Reported (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Jun. 30, 2020
Effective Income Tax Rate Reconciliation, Amount        
Federal income tax expense at the statutory rate $ (19.8) $ (29.5) $ (12.0) $ (46.9)
State income taxes, net of federal benefit (1.2) (3.3) (1.8) 4.0
Research and development credits (1.3) (3.5) 2.5 (2.8)
Uncertain tax positions 0.6 0.6 (3.0) 1.5
Incentive stock option and employee stock purchase plan expense 2.5 2.5 0.7 (0.2)
Foreign rate differential (2.1) 0.0 0.5 0.7
Change in valuation allowance (0.3) 2.6 (3.2) 3.5
CARES Act (20.7) 0.0 2.7 0.0
Non-deductible meals and entertainment 0.5 0.0 0.1 1.8
Non-deductible officer compensation 0.1 3.5 3.3 1.6
Asset impairment 0.0 0.0 0.0 12.6
Non-deductible legal settlement 0.0 0.0 2.5 0.0
Acquisitions, dispositions, and contingent consideration 0.7 (0.1) (23.0) (0.3)
Other, net 0.0 (1.4) 0.8 0.8
Total income tax benefit $ (41.0) $ (28.6) $ (29.9) $ (23.7)
Effective Income Tax Rate Reconciliation, Percent        
Federal income tax expense at the statutory rate 21.00% 21.00% 21.00% 21.00%
State income taxes, net of federal benefit 1.30% 2.30% 3.20% (1.80%)
Research and development credits 1.40% 2.50% (4.40%) 1.30%
Uncertain tax positions (0.70%) (0.40%) 5.30% (0.70%)
Incentive stock option and employee stock purchase plan expense (2.70%) (1.80%) (1.20%) 0.10%
Foreign rate differential 2.20% 0.00% (0.90%) (0.30%)
Change in valuation allowance 0.30% (1.80%) 5.60% (1.70%)
CARES Act 22.00% 0.00% (4.70%) 0.00%
Non-deductible meals and entertainment (0.50%) 0.00% (0.20%) (0.80%)
Non-deductible officer compensation (0.10%) (2.50%) (5.80%) (0.70%)
Asset impairment 0.00% 0.00% 0.00% (5.60%)
Non-deductible legal settlement 0.00% 0.00% (4.50%) 0.00%
Acquisitions, dispositions, and contingent consideration (0.70%) 0.10% 40.30% 0.10%
Other, net 0.00% 0.90% (1.40%) (0.30%)
Total income tax benefit 43.50% 20.30% 52.30% 10.60%