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Income taxes
 3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Income taxes Income taxes
Three Months Ended March 31,
20242023
Continuing operations  
Provision (benefit) for income taxes (in millions)$26.2 20.3 
Effective tax rate33.4 %53.6 %

2024 Compared to U.S. Statutory Rate
The effective income tax rate on continuing operations in the first three months of 2024 was greater than the 21% U.S. statutory rate due to the geographical mix of earnings, the seasonality of book losses for which no tax benefit can be recorded, nondeductible expenses in Mexico, taxes on cross border payments and U.S. taxable income and credit limitations.

2023 Compared to U.S. Statutory Rate
The effective income tax rate on continuing operations in the first three months of 2023 was greater than the 21% U.S. statutory rate due to the geographical mix of earnings, the seasonality of book losses for which no tax benefit can be recorded, nondeductible expenses in Mexico, taxes on cross border payments and U.S. taxable income and credit limitations, and the characterization of a French business tax as an income tax.