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Net Income Per Share
 6 Months Ended
Jun. 30, 2023
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:
Three Months Ended June 30,Six Months Ended June 30,
 2023202220232022
 (In millions, except net income per share)
Numerator:
Net income$309 $248 $630 $506 
Denominator:
Shares outstanding at the beginning of the period57.7 58.1 57.4 57.9 
Weighted-average number of shares issued:
Stock-based compensation— — 0.2 0.2 
Stock purchases— (0.3)— (0.2)
Denominator for basic net income per share57.7 57.8 57.6 57.9 
Effect of dilutive securities: (1)
Stock-based compensation0.2 0.6 0.4 0.7 
Denominator for diluted net income per share57.9 58.4 58.0 58.6 
Net income per share - Basic (2)
$5.37 $4.29 $10.95 $8.74 
Net income per share - Diluted (2)
$5.35 $4.25 $10.87 $8.63 
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(1)    The dilutive effect of all potentially dilutive common shares is calculated using the treasury stock method.
(2)    Source data for calculations in thousands.