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Earnings Per Share Computations (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Calculation of earnings per share
A reconciliation of basic and diluted earnings per share is below: 
 
 
Three Months Ended March 31,
(in millions, except per share amounts)
 
2019
 
2018
Numerator
 
 

 
 

Net income
 
$
60.4

 
$
47.6

 
 
 
 
 
Denominator
 
 

 
 

Weighted average common shares outstanding — basic
 
91.2

 
91.0

Dilutive shares
 
0.8

 
0.2

Weighted average common and common equivalent shares outstanding — diluted
 
92.0

 
91.2

 
 
 
 
 
Per common share income
 
 

 
 

Basic
 
$
0.66

 
$
0.52

Diluted
 
$
0.66

 
$
0.52