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Income tax provision (Tables)
9 Months Ended
Sep. 30, 2021
Income Tax Disclosure [Abstract]  
Effective income tax rate reconciliation
The effective tax rate on pretax income (loss) reconciles to the U.S. federal statutory tax rate as follows:
Nine Months Ended September 30, 2021
Year Ended December 31, 2020(1)
Income tax at federal statutory rate21.0 %21.0 %
Goodwill impairment charges (Note 8)— 46.8 %
State income tax expense, net of federal income tax benefit3.1 %2.1 %
Non-deductible acquisition costs2.8 %— 
Non-deductible executive compensation1.7 %2.2 %
Foreign tax rate differences1.2 %4.3 %
Tax impact of share-based compensation0.8 %8.5 %
Change in unrecognized tax benefits, including interest and penalties0.4 %(3.3 %)
Research and development tax credit(0.8 %)(3.7 %)
Payables and receivables for prior year tax returns(0.3 %)3.2 %
Non-taxable income from employee life insurance policies(0.3 %)(1.1 %)
Return to provision adjustments(0.1 %)(2.6 %)
Change in valuation allowances— 0.9 %
Other0.2 %1.8 %
Effective tax rate29.7 %80.1 %