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Earnings Per Share Computations (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Calculation of earnings per share
A reconciliation of basic and diluted earnings per share is below: 
(in millions, except per share amounts)
 
2018
 
2017
 
2016
Numerator
 
 

 
 

 
 

Net income
 
$
225.7

 
$
94.0

 
$
236.2

 
 
 
 
 
 
 
Denominator
 
 

 
 

 
 

Weighted-average common shares outstanding — basic
 
91.0

 
91.5

 
94.3

Dilutive shares
 
0.5

 
0.4

 
0.8

Weighted-average common and common equivalent shares outstanding — diluted
 
91.5

 
91.9

 
95.1

 
 
 
 
 
 
 
Per common share income
 
 

 
 

 
 

Basic
 
$
2.48

 
$
1.03

 
$
2.51

Diluted
 
$
2.47

 
$
1.02

 
$
2.48