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Earnings Per Share Computations (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Calculation of earnings per share
A reconciliation of basic and diluted earnings per share is below: 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions, except per share amounts)
 
2015
 
2014
 
2015
 
2014
Numerator
 
 

 
 

 
 

 
 

Net income
 
$
65.6

 
$
65.8

 
$
120.0

 
$
115.0

 
 
 
 
 
 
 
 
 
Denominator
 
 

 
 

 
 

 
 

Weighted average common shares outstanding — basic
 
96.9

 
100.4

 
97.3

 
101.0

Dilutive shares
 
1.2

 
0.9

 
1.1

 
0.9

Weighted average common and common equivalent shares outstanding — diluted
 
98.1

 
101.3

 
98.4

 
101.9

 
 
 
 
 
 
 
 
 
Per common share income
 
 

 
 

 
 

 
 

Basic
 
$
0.68

 
$
0.66

 
$
1.23

 
$
1.14

Diluted
 
$
0.67

 
$
0.65

 
$
1.22

 
$
1.13