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Income Taxes
 6 Months Ended
Jun. 30, 2024
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The following table presents Income tax expense and the effective tax rate:
 Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
 (Dollars in millions)
Income tax expense$60.1 $56.8 $120.0 $111.9 
Effective tax rate23 %23 %23 %23 %
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.