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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2021
Income Tax Disclosure [Abstract] |
Reconciliation between the U.S. federal statutory tax rate and effective tax rate | A reconciliation between the U.S. federal statutory tax rate and our effective tax rate is summarized as follows:
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Statutory rate | 21.0 | % |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State taxes | 0.3 |  |  | 0.9 |  |  | 0.9 |  |  | 0.6 |
Taxes on foreign earnings | (20.2) |  |  | (3.0) |  |  | (11.5) |  |  | (3.6) |
Tax credits | (7.1) |  |  | (2.3) |  |  | (4.1) |  |  | (1.3) |
Purchased intangible assets | (6.2) |  |  | 2.9 |  |  | (1.4) |  |  | 0.8 |
TECFIDERA impairment | — |  |  | 3.5 |  |  | — |  |  | 1.9 |
GILTI | 2.6 |  |  | 2.2 |  |  | 1.6 |  |  | 1.3 |
Neurimmune tax impacts | (0.5) |  |  | 0.2 |  |  | (36.4) |  |  | (0.1) |
Other | 1.2 |  |  | (0.3) |  |  | 0.7 |  |  | 0.3 |
Effective tax rate | (8.9) | % |  | 25.1 | % |  | (29.2) | % |  | 20.9 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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