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Net Income Per Share (Tables)
9 Months Ended
Sep. 30, 2014
Earnings Per Share [Abstract]  
Reconciliation of Basic to Diluted 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
September 30,
 
Nine Months Ended
September 30,
(In millions)
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
Net income
$
31.0

 
$
26.8

 
$
95.7

 
$
88.7

Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding
71.0

 
69.8

 
70.8

 
69.4

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

 
1.6

 
1.7

 
1.4

Assumed conversion of convertible debt, based on the if-converted method

 

 

 
0.1

Weighted average shares assuming dilution
72.6

 
71.4

 
72.5

 
70.9