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Net Income Per Common Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Net Income Per Common Share NET INCOME PER COMMON SHARE
Basic net income per common share excludes the dilutive impact of potentially dilutive securities and is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted net income per common share includes the effect of potential dilution from the hypothetical exercise of outstanding stock options and vesting of restricted stock awards, restricted stock units, performance stock awards and performance share units. A reconciliation of our basic and diluted net income per common share is as follows:
Year Ended December 31,
(In millions, except per share data)202120202019
Net income to common shareholders $263.9 $121.6 $249.0 
Basic weighted average shares outstanding 231.0 235.2 233.9 
Diluted weighted average shares outstanding231.9 236.0 235.8 
Net income per common share:
Basic net income per share$1.14 $0.52 $1.06 
Diluted net income per share$1.14 $0.52 $1.06 
The number of anti-dilutive shares that have been excluded in the computation of diluted net income per share for the years ended December 31, 2021, 2020 and 2019 were 0.7 million, 2.7 million and 2.6 million, respectively.