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EARNINGS PER SHARE
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
EARNINGS PER SHARE EARNINGS PER SHARE
A reconciliation of net income and shares used to calculate basic and diluted earnings per share is as follows (dollars in millions and shares in thousands):
Three months endedNine months ended
September 30,September 30,
 2025202420252024
Net income for basic and diluted earnings per share$23.1 $9.3 $136.4 $237.9 
Shares:  
Weighted average shares outstanding for basic earnings per share96,603 105,101 98,639 107,265 
Effect of dilutive securities on weighted average shares:  
Amounts related to employee benefit plans1,950 2,030 2,031 1,813 
Weighted average shares outstanding for diluted earnings per share98,553 107,131 100,670 109,078 
Basic earnings per common share is computed by dividing net income by the weighted average number of common shares outstanding for the period.  Restricted shares (including our performance units) are not included in basic earnings per share until vested.  Diluted earnings per share reflect the potential dilution that could occur if outstanding stock options were exercised and restricted stock was vested.  The dilution from options and restricted shares is calculated using the treasury stock method.  Under this method, we assume the proceeds from the exercise of the options (or the unrecognized compensation expense with respect to restricted stock and performance units) will be used to purchase shares of our common stock at the average market price during the period, reducing the dilutive effect of the exercise of the options (or the vesting of the restricted stock and performance units).