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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator:                
Net income $ 74 $ 62 $ 52 $ 62 $ 23 $ 15 $ 188 $ 99
Denominator:                
Shares used in net income per common share - basic 67.3     67.4     67.3 67.2
Effect of dilutive securities 0.3     0.2     0.3 0.3
Shares used in net income per common share - diluted 67.6     67.6     67.6 67.5
Net income per common share:                
Basic $ 1.1     $ 0.92     $ 2.79 $ 1.48
Net income per common share:                
Diluted $ 1.1     $ 0.92     $ 2.78 $ 1.47