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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%

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