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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Basic and Diluted Income (Loss) per Share
The computations of basic and diluted earnings per share are as follows.

  
For the
Three Month
Period Ended
March 31,
2019
  
For the
Three Month
Period Ended
March 31,
2018
 
Net income
 
$
47.1
  
$
42.4
 
Average shares outstanding
        
Basic
  
201.6
   
201.6
 
Diluted
  
207.7
   
209.9
 
Earnings per share
        
Basic
 
$
0.23
  
$
0.21
 
Diluted
 
$
0.23
  
$
0.20