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Net Income per Share
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Net Income per Share Net Income per Share
The following table sets forth the calculation of net income per share:
Three Months Ended June 30,Six Months Ended June 30,
 2021202020212020
 (In millions, except net income per share)
Numerator:
Net income$185 $276 $413 $454 
Denominator:
Shares outstanding at the beginning of the period57.7 58.6 58.0 61.9 
Weighted-average number of shares issued:
Stock purchases— — (0.5)(2.5)
Stock-based compensation— — 0.2 — 
Denominator for basic net income per share57.7 58.6 57.7 59.4 
Effect of dilutive securities: (1)
Stock-based compensation0.7 0.8 0.8 0.8 
Denominator for diluted net income per share58.4 59.4 58.5 60.2 
Net income per share - Basic (2)
$3.20 $4.72 $7.14 $7.65 
Net income per share - Diluted (2)
$3.16 $4.65 $7.05 $7.54 
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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.