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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2016
Earnings Per Share [Abstract]  
Computation of basic and diluted net income per common share
he following table shows the computation of our basic and diluted net income per common share (in millions, except per share amounts):
 
Three Months Ended
September 30
 
Nine Months Ended
September 30
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net income
$
95.7

 
$
39.5

 
$
226.2

 
$
147.1

Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding - basic
40.1

 
42.8

 
40.7

 
43.5

Effect of dilutive securities:
 
 
 
 
 
 
 
Equity compensation plans
0.5

 
0.6

 
0.5

 
0.6

Weighted average shares outstanding - diluted
40.6

 
43.4

 
41.2

 
44.1

Basic earnings per share
$
2.39

 
$
0.92

 
$
5.55

 
$
3.38

Diluted earnings per share
$
2.36

 
$
0.91

 
$
5.49

 
$
3.33