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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Weighted Average Shares Outstanding
The effects of potential common stock were determined using the treasury stock method. Weighted average shares outstanding are shown below:
 
Three months ended June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Basic shares outstanding
103.2

 
102.1

 
103.1

 
102.0

Effect of potential common stock:
 
 
 
 
 
 
 
Common stock awards
1.2

 
1.3

 
1.2

 
1.2

Diluted shares outstanding
104.4

 
103.4

 
104.3

 
103.2