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Net Income Per Share
 12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
Net Income Per Share Net Income Per Share
The following table sets forth the calculation of basic and diluted net income per share:
Year Ended December 31,
202220212020
(In millions, except net income per share)
Numerator:
Net income$792 $659 $673 
Denominator:
Shares outstanding at the beginning of the period57.9 58.0 61.9 
Weighted-average number of shares issued:
Stock purchases(0.5)(0.5)(3.0)
Stock-based compensation0.4 0.3 0.1 
Denominator for basic net income per share57.8 57.8 59.0 
Effect of dilutive securities: (1)
Stock-based compensation0.7 0.8 0.9 
Denominator for diluted net income per share58.5 58.6 59.9 
Net income per share - Basic (2)
$13.72 $11.40 $11.40 
Net income per share - Diluted (2)
$13.55 $11.25 $11.23 
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(1)    The dilutive effect of all potentially dilutive common shares is calculated using the treasury stock method. Certain potentially dilutive common shares issuable are not included in the computation of diluted net income per share because to do so would have been anti-dilutive.
(2)    Source data for calculations in thousands.