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Income taxes (Tables)
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of relationship between income tax expense or benefit and income or loss before income taxes
The following table presents the relationship between income tax expense or benefit and income or loss before income taxes:
(in millions)
Three months ended March 31,
2021
2020
Income before income taxes
$211.4 $64.7 
Income tax expense
(47.4)(17.7)
Effective income tax rate22.4 %27.4 %