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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares
Our weighted-average shares outstanding for the three and nine months ended September 30, 2020 and 2019 was as follows:
Three Months Ended September 30,Nine Months Ended September 30,
(in millions)2020201920202019
Weighted-average number of shares of common stock outstanding - basic94.5 97.6 95.0 100.4 
Stock options— 0.4 0.1 0.4 
Restricted stock units1.1 0.9 1.1 1.1 
Weighted-average shares and assumed conversions - diluted95.6 98.9 96.2 101.9