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Earnings Per Common Share
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Earnings 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 shares and performance shares. 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)
 
2018
 
2017
 
2016
Net income to common shareholders
 
$
207.1

 
$
36.7

 
$
38.8

Basic weighted average shares outstanding
 
239.0

 
240.4

 
238.1

Diluted weighted average shares outstanding
 
242.9

 
246.1

 
244.4

Net income per common share:
 
 
 
 
 
 
Basic net income per share
 
$
0.87

 
$
0.15

 
$
0.16

Diluted net income per share
 
$
0.85

 
$
0.15

 
$
0.16


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, 2018, 2017 and 2016 were 2.6 million, 1.8 million and 1.3 million, respectively.