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Income Taxes
 3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The following table presents Income tax expense and the effective tax rate:
 Three Months Ended March 31,
 20242023
 (Dollars in millions)
Income tax expense$59.9 $55.1 
Effective tax rate24 %24 %
The effective tax rate for each of the periods in the table above differed from the statutory federal rate of 21%, due to state income taxes and U.S. taxes on foreign earnings, net of foreign tax credits, partially offset by a lower foreign effective tax rate.