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Net Income Per Share
 3 Months Ended
Mar. 31, 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 March 31,
 20242023
 (In millions, except net income per share)
Numerator:
Net income$301 $321 
Denominator:
Shares outstanding at the beginning of the period57.8 57.4 
Weighted-average number of shares issued:
Stock-based compensation0.1 0.1 
Denominator for basic net income per share57.9 57.5 
Effect of dilutive securities: (1)
Stock-based compensation0.4 0.5 
Denominator for diluted net income per share58.3 58.0 
Net income per share - Basic (2)
$5.21 $5.58 
Net income per share - Diluted (2)
$5.17 $5.52 
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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.