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Net Income Per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Net Income Per Share
Net Income Per Share

The following table reconciles net income and shares used in the calculation of basic net income per share to those used for diluted net income per share:
 
Three Months Ended
March 31,
(In millions)
2015
 
2014
Numerator:
 
 
 
Net income
$
32.9

 
$
27.1

Denominator:
 
 
 
Weighted average common shares outstanding
71.7

 
70.6

Dilutive effect of stock options, stock appreciation rights and performance share awards, based on the treasury stock method
1.6

 
1.7

Weighted average shares assuming dilution
73.3

 
72.3



There were 0.8 million and 0.2 million antidilutive shares outstanding during the three months ended March 31, 2015 and 2014, respectively.