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Net Income Per Common Share Computations (Tables)
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted The following is a reconciliation of the numerator and denominator of the net income per common share computations:
Three Months Ended September 30,Nine Months Ended September 30,
(in millions, except per share data) 2023202220232022
Numerator for basic and diluted net income per common share:
Net income$61.0 $57.0 $359.7 $438.4 
Denominator for net income per common share:
Basic75.2 75.6 75.3 76.1 
Plus dilutive effect of stock awards1.9 1.1 1.4 1.1 
Diluted77.1 76.7 76.7 77.2 
Net income per common share data:
Basic net income$0.81 $0.75 $4.78 $5.76 
Diluted net income$0.79 $0.74 $4.69 $5.68