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Earnings Per Share Computations (Tables)
 6 Months Ended
Jun. 30, 2017
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)
 
2017
 
2016
 
2017
 
2016
Numerator
 
 

 
 

 
 

 
 

Net income
 
$
28.0

 
$
50.9

 
$
79.1

 
$
107.1

 
 
 
 
 
 
 
 
 
Denominator
 
 

 
 

 
 

 
 

Weighted average common shares outstanding — basic
 
92.0

 
94.7

 
92.2

 
94.8

Dilutive shares
 
0.3

 
1.0

 
0.3

 
1.0

Weighted average common and common equivalent shares outstanding — diluted
 
92.3

 
95.7

 
92.5

 
95.8

 
 
 
 
 
 
 
 
 
Per common share income
 
 

 
 

 
 

 
 

Basic
 
$
0.31

 
$
0.54

 
$
0.86

 
$
1.13

Diluted
 
$
0.30

 
$
0.53

 
$
0.85

 
$
1.12