Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares

Our weighted-average shares outstanding for the years ended December 31, 2018, 2017 and 2016 was as follows:

(in millions)	2018	2017	2016
Weighted-average number of shares of common stock outstanding - basic	104.8	108.1	107.0
Stock options	1.0	1.3	0.8
Restricted stock units	1.2	1.5	1.4
Adjusted weighted-average shares and assumed conversions - diluted	107.0	110.9	109.2