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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, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019
Effective Income Tax Rate Reconciliation, Amount |  |  |  |  |  |
Federal income tax expense at the statutory rate | $ (19.8) |  | $ (12.0) |  | $ (46.9) | $ 0.0
State income taxes, net of federal benefit | (1.2) |  | (1.8) |  | 4.0 | 2.0
Research and development credits | (1.3) |  | 2.5 |  | (2.8) | (3.7)
Uncertain tax positions | 0.6 |  | (3.0) |  | 1.5 | (4.2)
Incentive stock option and employee stock purchase plan expense | 2.5 |  | 0.7 |  | (0.2) | (3.1)
Foreign rate differential | (2.1) |  | 0.5 |  | 0.7 | 0.8
Change in valuation allowance | (0.3) |  | (3.2) |  | 3.5 | (0.2)
CARES Act | (20.7) |  | 2.7 |  |  |
Non-deductible meals and entertainment | 0.5 |  | 0.1 |  | 1.8 | 1.3
Non-deductible officer compensation | 0.1 |  | 3.3 |  | 1.6 | 0.6
Asset impairment | 0.0 |  | 0.0 |  | 12.6 | 0.0
Non-deductible legal settlement | 0.0 |  | 2.5 |  | 0.0 | 1.9
Acquisitions, Dispositions, and Contingent Consideration | 0.7 |  | (23.0) |  | (0.3) | 0.8
Method changes or tax elections | 0.0 |  | 0.0 |  | 0.0 | (0.9)
Other, net | 0.0 |  | 0.8 |  | 0.8 | 0.3
Total income tax benefit | $ (41.0) | $ (4.8) | $ (29.9) | $ (59.9) | $ (23.7) | $ (4.4)
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% |  | 3.20% |  | (1.80%) | 6422.10%
Research and development credits | 1.40% |  | (4.40%) |  | 1.30% | (11880.90%)
Uncertain tax positions | (0.70%) |  | 5.30% |  | (0.70%) | (13486.40%)
Incentive stock option and employee stock purchase plan expense | (2.70%) |  | (1.20%) |  | 0.10% | (9954.30%)
Foreign rate differential | 2.20% |  | (0.90%) |  | (0.30%) | 2568.80%
Change in valuation allowance | 0.30% |  | 5.60% |  | (1.70%) | (642.20%)
CARES Act | 22.00% |  | (4.70%) |  |  |
Non-deductible meals and entertainment | (0.50%) |  | (0.20%) |  | (0.80%) | 4174.40%
Non-deductible officer compensation | (0.10%) |  | (5.80%) |  | (0.70%) | 1926.60%
Asset impairment | 0.00% |  | 0.00% |  | (5.60%) | 0.00%
Non-deductible legal settlement | 0.00% |  | (4.50%) |  | 0.00% | 6101.00%
Acquisitions, Dispositions, and Contingent Consideration | (0.70%) |  | 40.30% |  | 0.10% | 2568.80%
Method changes or tax elections | 0.00% |  | 0.00% |  | 0.00% | (2890.00%)
Other, net | 0.00% |  | (1.40%) |  | (0.30%) | 963.40%
Total income tax benefit | 43.50% |  | 52.30% |  | 10.60% | (14107.70%)

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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