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Income Taxes (Tables)
3 Months Ended
Mar. 28, 2021
Income Tax Disclosure [Abstract]  
Reconciliation of income tax benefit at statutory rate to income tax provision
A reconciliation of the total income tax benefit to the amount computed by applying the statutory federal income tax rate of 21% to income from continuing operations before income taxes for the three months ended March 28, 2021 and March 29, 2020 is as follows (in millions):
 For the Three Months Ended
 March 28,
2021
March 29,
2020
Income tax at federal statutory rate$(0.2)$(0.3)
State and foreign taxes, net of federal tax benefit and valuation allowance— (0.3)
Release of valuation allowance due to acquisitions— (0.9)
Nondeductible expenses and other(0.2)(0.1)
Decrease in reserves for uncertain tax positions— (0.2)
Stock compensation - excess tax benefits(2.4)— 
Federal impact of research & development tax credits0.1 — 
Increase in federal valuation allowance— 0.4 
Benefit for income taxes from continuing operations$(2.7)$(1.4)