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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule of Restricted Stock Activity The following table presents restricted stock activity for the years 2021, 2020 and 2019:
202120202019
# of SharesWeighted Average Fair Value at Date of Grant# of SharesWeighted Average Fair Value at Date of Grant# of SharesWeighted Average Fair Value at Date of Grant
Nonvested restricted shares outstanding at January 1405,299 $34.96 221,622 $37.08 184,190 $40.33 
Granted207,135 39.10 339,454 34.27 155,982 35.62 
Forfeited(4,345)33.37 (36,749)33.98 (8,869)41.34 
Vested(230,360)35.71 (119,028)37.15 (109,681)40.12 
Nonvested restricted shares outstanding at December 31377,729 $36.78 405,299 $34.96 221,622 $37.08 
Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands):
For the Years Ended December 31,
202120202019
Numerator (basic and diluted):
Net income$88.9 $83.8 $85.8 
Less: Dividends paid to participating securities(0.6)(0.7)(0.4)
Less: Undistributed earnings available to participating securities(0.5)(0.4)(0.2)
Undistributed and distributed earnings available to common stockholders$87.8 $82.7 $85.2 
Denominator:
Average number of common shares outstanding31,030.4 30,832.7 30,652.2 
Effect of dilutive stock-based compensation369.9 271.5 186.1 
Average number of common and potential common shares outstanding31,400.3 31,104.2 30,838.3