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Net Income Per Common Share Computations (Tables)
 9 Months Ended
Sep. 30, 2022
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) 2022202120222021
Numerator for basic and diluted net income per common share:
Net income$57.0 $61.4 $438.4 $205.8 
Denominator for net income per common share:
Basic37.8 38.6 38.1 38.7 
Plus dilutive effect of stock awards0.6 0.6 0.5 0.6 
Diluted38.4 39.2 38.6 39.3 
Net income per common share data:
Basic net income$1.51 $1.59 $11.52 $5.31 
Diluted net income$1.49 $1.57 $11.36 $5.23