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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares
Our weighted-average shares outstanding for the three and six months ended June 30, 2019 and 2018 was as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2019
 
2018
 
2019
 
2018
Weighted-average number of shares of common stock outstanding - basic
101.3

 
106.1

 
101.8

 
106.4

Stock options
0.3

 
1.1

 
0.4

 
1.2

Restricted stock units
0.6

 
0.8

 
1.1

 
1.4

Weighted-average shares and assumed conversions - diluted
102.2

 
108.0

 
103.3

 
109.0