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Earnings per Share (Tables)
9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Components of Basic and Diluted Earnings Per Share 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 $$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