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Net Income Per Share (Tables)
 6 Months Ended
Jun. 30, 2022
Earnings Per Share [Abstract]  
Summary of Denominators for The Computation of Basic and Diluted Earnings 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,
 2022202120222021
 (In millions, except net income per share)
Numerator:
Net income$248 $185 $506 $413 
Denominator:
Shares outstanding at the beginning of the period58.1 57.7 57.9 58.0 
Weighted-average number of shares issued:
Stock-based compensation— — 0.2 0.2 
Stock purchases(0.3)— (0.2)(0.5)
Denominator for basic net income per share57.8 57.7 57.9 57.7 
Effect of dilutive securities: (1)
Stock-based compensation0.6 0.7 0.7 0.8 
Denominator for diluted net income per share58.4 58.4 58.6 58.5 
Net income per share - Basic (2)
$4.29 $3.20 $8.74 $7.14 
Net income per share - Diluted (2)
$4.25 $3.16 $8.63 $7.05 
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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.