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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Computation of basic and diluted net income per common share
The following table shows the computation of our basic and diluted net income per common share (in millions, except per share amounts):
 
Three Months Ended
June 30
 
Six Months Ended
June 30
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net income
$
53.4

 
$
61.2

 
$
110.9

 
$
130.5

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding - basic
39.0

 
40.6

 
39.2

 
41.1

Effect of dilutive securities:
 
 
 
 
 
 
 
Equity compensation plans
0.5

 
0.5

 
0.5

 
0.4

Weighted average shares outstanding - diluted
39.5

 
41.1

 
39.7

 
41.5

Basic earnings per share
$
1.37

 
$
1.51

 
$
2.83

 
$
3.18

Diluted earnings per share
$
1.35

 
$
1.49

 
$
2.79

 
$
3.15