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Income Per Share
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Income Per Share Income Per Share
 
The following table shows how we reconcile our net income and the number of shares used in computing basic and diluted income per share:

(in millions, except per share amounts)
 
2019
 
2018
 
2017
Basic net income per share:
 
 
 
 
 
 
Consolidated net income
 
$
152.0

 
$
183.0

 
$
136.9

 
 
 
 
 
 
 
Weighted average common shares outstanding
 
42.7

 
42.6

 
42.7

 
 
 
 
 
 
 
Basic net income per share
 
$
3.56

 
$
4.30

 
$
3.21

 
 
 
 
 
 
 
Diluted net income per share:
 
 
 
 
 
 
Consolidated net income
 
$
152.0

 
$
183.0

 
$
136.9

 
 


 


 
 
Weighted average common shares outstanding
 
42.7

 
42.6

 
42.7

Net effect of dilutive stock options and restricted stock units
 
0.5

 
0.4

 
0.3

Weighted average common shares outstanding for computing diluted income per share
 
43.2

 
43.0

 
43.0

 
 


 


 
 
Diluted net income per share
 
$
3.52

 
$
4.25

 
$
3.18


During the periods presented, the number of anti-dilutive restricted stock units, performance share awards, or market stock units to exclude from our calculation of diluted earnings per share was immaterial.