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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2024
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
June 30,		Six Months Ended June 30,
In millions, except per share amounts2024202320242023
Net income attributable to common stockholders$37 $17 $57 $57 
Weighted average outstanding shares of common stock96.5 101.0 97.0 101.2 
Dilutive effect of employee stock options, restricted stock and other stock awards0.9 1.9 1.9 2.1 
Common stock and common stock equivalents97.4 102.9 98.9 103.3 
Net income per share:
Basic$0.38 $0.17 $0.59 $0.56 
Diluted$0.38 $0.17 $0.58 $0.55