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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Activity The following table presents restricted stock activity for the years 2020, 2019 and 2018:
202020192018
# 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 1221,622 $37.08 184,190 $40.33 283,338 $37.26 
Granted339,454 34.27 155,982 35.62 142,475 39.58 
Forfeited(36,749)33.98 (8,869)41.34 (12,858)40.06 
Vested(119,028)37.15 (109,681)40.12 (228,765)35.86 
Nonvested restricted shares outstanding at December 31405,299 $34.96 221,622 $37.08 184,190 $40.33 
Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income per share follows ($ in millions, shares in thousands):
For the Years Ended December 31,
202020192018
Numerator (basic and diluted):
Net income$83.8 $85.8 $94.5 
Less: Dividends paid to participating securities(0.7)(0.4)(0.3)
Less: Undistributed earnings available to participating securities(0.4)(0.2)(0.3)
Undistributed and distributed earnings available to common stockholders$82.7 $85.2 $93.9 
Denominator:
Average number of common shares outstanding30,832.7 30,652.2 30,551.3 
Effect of dilutive stock-based compensation271.5 186.1 141.6 
Average number of common and potential common shares outstanding31,104.2 30,838.3 30,692.9