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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2024
Income Tax Disclosure [Abstract]  
Income Tax Expense From Continuing Operations And The Effective Tax Rate
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 %