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Earnings per Common Share (Tables)
12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings per Share

The following table sets forth the computation of basic and diluted earnings per common share:
Year Ended December 31,
2019
 
2018
 
2017
Net income, basic and diluted
$
181.0

 
$
160.2

 
$
106.5

Weighted average common shares outstanding for basic earnings per share computation
63,645,029

 
57,778,857

 
51,429,366

Dilutive effects of stock-based compensation
239,839

 
438,266

 
473,843

Weighted average common shares outstanding for diluted earnings per common share computation
63,884,868

 
58,217,123

 
51,903,209

 
 
 
 
 
 
Basic earnings per common share
$
2.84

 
$
2.77

 
$
2.07

Diluted earnings per common share
2.83

 
2.75

 
2.05