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Income Taxes
 6 Months Ended
Jun. 30, 2022
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,
 2022202120222021
 (Dollars in millions)
Income tax expense$51.4 $40.2 $100.2 $78.1 
Effective tax rate24 %21 %24 %21 %
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, offset by a lower foreign effective tax rate. The effective tax rate in the three and six months ended June 30, 2022 reflects an increased foreign effective tax rate primarily as a result of the transfer of intellectual property between certain non-U.S. subsidiaries that took place in the fourth quarter of 2021.