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Earnings per Share
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Earnings per Share Earnings per Share
Basic earnings per share is calculated by dividing net income by the weighted average number of shares outstanding during the reported period. The calculation of diluted earnings per share is similar to basic earnings per share, except that the weighted average number of shares outstanding includes the dilution from potential shares resulting from stock options, restricted stock awards and other stock awards. The components of basic and diluted earnings per share are as follows:
 Three Months Ended
September 30,		Nine Months Ended September 30,
In millions, except per share amounts2023202220232022
Net income attributable to common stockholders$12 $8 $69 $40 
Weighted average outstanding shares of common stock99.2 102.7 100.5 103.7 
Dilutive effect of employee stock options, restricted stock and other stock awards2.8 2.0 2.3 2.7 
Common stock and common stock equivalents102.0 104.7 102.8 106.4 
Net income per share:
Basic$0.12 $0.08 $0.69 $0.39 
Diluted$0.12 $0.08 $0.67 $0.38 
Options to purchase 0.1 million shares for the nine months ended September 30, 2023 and 0.4 million shares in each of the three and nine months ended September 30, 2022 were not included in the computation of diluted earnings per share because the exercise prices of these options were greater than the average market price of the common shares for the period, and therefore would have been anti-dilutive. There were no anti-dilutive options excluded for the three months ended September 30, 2023.