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Net Income Per Share (Tables)
6 Months Ended
Jun. 30, 2016
Earnings Per Share [Abstract]  
Reconciliation of Basic to Diluted Net Income Per Share
The following table reconciles the shares used in the calculation of basic net income per share to those used for diluted net income per share:

 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
2016
 
2015
 
2016
 
2015
Net income
$
44.7

 
$
27.8

 
$
66.9

 
$
60.7

 
 
 
 
 
 
 
 
Weighted average common shares outstanding
73.3

 
72.0

 
72.9

 
71.9

Dilutive effect of equity awards, based on the treasury stock method
1.5

 
1.7

 
1.6

 
1.6

Weighted average shares assuming dilution
74.8

 
73.7

 
74.5

 
73.5