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Net Income Per Share
 6 Months Ended
Jun. 30, 2024
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,
 2024202320242023
 (In millions, except net income per share)
Numerator:
Net income$301 $309 $602 $630 
Denominator:
Shares outstanding at the beginning of the period58.1 57.7 57.8 57.4 
Weighted-average number of shares issued:
Stock-based compensation— — 0.2 0.2 
Denominator for basic net income per share58.1 57.7 58.0 57.6 
Effect of dilutive securities: (1)
Stock-based compensation0.1 0.2 0.3 0.4 
Denominator for diluted net income per share58.2 57.9 58.3 58.0 
Net income per share - Basic (2)
$5.18 $5.37 $10.38 $10.95 
Net income per share - Diluted (2)
$5.17 $5.35 $10.33 $10.87 
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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 be anti-dilutive. For the three and six months ended June 30, 2024, 208,000 shares and 140,000 shares, respectively, were excluded from diluted shares outstanding.
(2)    Source data for calculations in thousands.