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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018 and 2017, was as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(in millions)
2018
 
2017
 
2018
 
2017
Weighted-average number of shares of common stock outstanding - basic
106.1

 
109.5

 
106.4

 
108.9

Stock options
1.1

 
1.4

 
1.2

 
1.4

Restricted stock units
0.8

 
1.0

 
1.4

 
1.8

Weighted-average shares and assumed conversions - diluted
108.0

 
111.9

 
109.0

 
112.1