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Earnings Per Share Computations (Tables)
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Calculation of earnings per share
A reconciliation of basic and diluted earnings per share is below: 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions, except per share amounts)
 
2016
 
2015
 
2016
 
2015
Numerator
 
 

 
 

 
 

 
 

Net income
 
$
68.6

 
$
62.5

 
$
175.7

 
$
182.5

 
 
 
 
 
 
 
 
 
Denominator
 
 

 
 

 
 

 
 

Weighted average common shares outstanding — basic
 
94.3

 
96.4

 
94.6

 
97.0

Dilutive shares
 
0.7

 
1.3

 
0.9

 
1.2

Weighted average common and common equivalent shares outstanding — diluted
 
95.0

 
97.7

 
95.5

 
98.2

 
 
 
 
 
 
 
 
 
Per common share income
 
 

 
 

 
 

 
 

Basic
 
$
0.73

 
$
0.65

 
$
1.86

 
$
1.88

Diluted
 
$
0.72

 
$
0.64

 
$
1.84

 
$
1.86