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Net Income per Share (Tables)
 9 Months Ended
Sep. 30, 2021
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 net income per share:
Three Months Ended September 30,Nine Months Ended September 30,
 2021202020212020
 (In millions, except net income per share)
Numerator:
Net income$143 $185 $556 $639 
Denominator:
Shares outstanding at the beginning of the period57.8 58.7 58.0 61.9 
Weighted-average number of shares issued:
Stock purchases— — (0.5)(2.8)
Stock-based compensation— — 0.3 0.1 
Denominator for basic net income per share57.8 58.7 57.8 59.2 
Effect of dilutive securities: (1)
Stock-based compensation0.7 0.9 0.7 0.8 
Denominator for diluted net income per share58.5 59.6 58.5 60.0 
Net income per share - Basic (2)
$2.49 $3.14 $9.63 $10.80 
Net income per share - Diluted (2)
$2.46 $3.10 $9.51 $10.65 
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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.