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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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 for the years ending December 31 (in millions, except per share amounts):
 
2018
 
2017
 
2016
Numerator:
 
 
 
 
 
Net income
$
211.3

 
$
502.0

 
$
257.1

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted average shares outstanding - basic
37.6

 
38.8

 
40.5

Effect of dilutive securities:
 
 
 
 
 
Equity compensation plans
0.7

 
0.6

 
0.4

Weighted average shares outstanding - diluted
38.3

 
39.4

 
40.9

Basic earnings per share
$
5.62

 
$
12.95

 
$
6.35

Diluted earnings per share
$
5.52

 
$
12.75

 
$
6.29