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Earnings per Share (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Weighted Average Number of Shares
The number of our weighted-average shares outstanding for the three and six months ended June 30, 2021 and 2020 was as follows:
Three Months Ended June 30,Six Months Ended June 30,
(in millions)2021202020212020
Weighted-average number of shares of common stock outstanding - basic95.5 94.5 95.3 95.3 
Stock options0.2 — 0.1 0.1 
Restricted stock units1.5 0.7 1.5 0.9 
Weighted-average shares and assumed conversions - diluted97.2 95.2 96.9 96.3