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Income taxes (Tables)
9 Months Ended
Sep. 30, 2024
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 and income before income taxes:
(in millions)
Three months ended September 30,
Nine months ended September 30,
2024
2023
2024
2023
Income before income taxes
$74.5$136.5$269.7$291.0
Income tax expense
(16.7)(28.1)(58.6)(68.4)
Effective income tax rate22.4 %20.6 %21.7 %23.5 %