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Earnings Per Share Computations (Tables)
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Calculation of earnings per share
A reconciliation of basic and diluted earnings per share is below: 
 
 
Three Months Ended March 31,
(in millions, except per share amounts)
 
2015
 
2014
Numerator
 
 

 
 

Net income
 
$
54.4

 
$
49.2

 
 
 
 
 
Denominator
 
 

 
 

Weighted average common shares outstanding — basic
 
97.7

 
101.5

Dilutive shares
 
1.1

 
0.9

Weighted average common and common equivalent shares outstanding — diluted
 
98.8

 
102.4

 
 
 
 
 
Per common share income
 
 

 
 

Basic
 
$
0.55

 
$
0.48

Diluted
 
$
0.55

 
$
0.48