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Net Income Per Share (Tables)
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
 2022202120222021
 (In millions, except net income per share)
Numerator:
Net income$230 $143 $736 $556 
Denominator:
Shares outstanding at the beginning of the period57.6 57.8 57.9 58.0 
Weighted-average number of shares issued:
Stock-based compensation— — 0.2 0.3 
Stock purchases— — (0.3)(0.5)
Denominator for basic net income per share57.6 57.8 57.8 57.8 
Effect of dilutive securities: (1)
Stock-based compensation0.7 0.7 0.7 0.7 
Denominator for diluted net income per share58.3 58.5 58.5 58.5 
Net income per share - Basic (2)
$4.00 $2.49 $12.74 $9.63 
Net income per share - Diluted (2)
$3.95 $2.46 $12.58 $9.51 
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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.