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Earnings per Common Share (Tables)
 9 Months Ended
Sep. 30, 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 share for the three and nine month periods ended September 30, 2019 and 2018:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
2018
 
2019
2018
Net income
$
49.1

$
41.4

 
$
128.6

$
119.8

Weighted average common shares outstanding for basic earnings per share computation
64,832,324

58,254,575

 
63,232,575

56,951,029

Dilutive effects of stock-based compensation
211,162

385,900

 
238,708

378,998

Weighted average common shares outstanding for diluted earnings per common share computation
65,043,486

58,640,475

 
63,471,283

57,330,027

 
 
 
 
 
 
Basic earnings per common share
$
0.76

$
0.71

 
$
2.03

$
2.10

Diluted earnings per common share
$
0.76

$
0.71

 
$
2.03

$
2.09

 
 
 
 
 
 
Anti-dilutive unvested time restricted stock
4,808

4,376

 
5,569

120,553