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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Provision and Effective Tax Rate
First Quarter
(Dollars in millions)20242023
Provision (benefit) for income taxes$46.4$44.9
Discrete event expense (benefit):
  Stock-based accounting$(5.3)$(5.9)
  Uncertain tax position reserves (primarily acquisition related)0.30.3
  Other discrete event expense (benefit)0.6(0.9)
Discrete event expense (benefit):$(4.4)$(6.5)
Provision (benefit) for income taxes without discrete event expense (benefit)$50.8$51.4
Income (loss) before income taxes$225.5$223.7
Effective tax rate20.6%20.1%
Effective tax rate without discrete events22.5%23.0%