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Income taxes
6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income taxes Income taxes
Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
Continuing operations    
Provision (benefit) for income taxes (in millions)$22.7 (43.2)$36.3 (55.4)
Effective tax rate45.7 %158.8 %46.1 %151.4 %

2021 Compared to U.S. Statutory Rate
The effective income tax rate on continuing operations in the first six months of 2021 was greater than the 21% U.S. statutory rate primarily 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 limitations, and the characterization of a French business tax as an income tax.

2020 Compared to U.S. Statutory Rate
The effective income tax rate on continuing operations in the first six months of 2020 was greater than the 21% U.S. statutory tax rate primarily 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 limitations, and the characterization of a French business tax as an income tax, partially offset by the tax benefits related to the distribution of share-based payments.