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Net Income Per Common Share Computations
 6 Months Ended
Jun. 30, 2022
Earnings Per Share [Abstract]  
Net Income Per Common Share Computations NET INCOME PER COMMON SHARE COMPUTATIONSThe following is a reconciliation of the numerator and denominator of the net income per common share computations:
Three Months Ended June 30,
Six Months Ended June 30,
(in millions, except per share data) 2022202120222021
Numerator for basic and diluted net income per common share:
Net income$339.3 $108.3 $381.4 $144.4 
Denominator for net income per common share:
Basic38.1 38.7 38.2 38.8 
Plus dilutive effect of stock awards0.5 0.6 0.5 0.6 
Diluted38.6 39.3 38.7 39.4 
Net income per common share data:
Basic net income$8.91 $2.80 $9.98 $3.72 
Diluted net income$8.79 $2.76 $9.85 $3.66