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Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator:            
Net income, basic and diluted $ 76 $ 67 $ 73 $ 58 $ 143 $ 131
Denominator:            
Basic weighted average common shares (in shares) 28.4   29.8   28.7 29.8
Stock options, RSUs and PSUs (in shares) 0.2   0.5   0.3 0.6
Weighted average shares used to calculate diluted earnings (loss) per share (in shares) 28.6   30.3   29.0 30.4
Earnings per share:            
Basic (in USD per share) $ 2.68   $ 2.42   $ 4.98 $ 4.39
Diluted (in USD per share) $ 2.66   $ 2.38   $ 4.93 $ 4.30
Antidilutive stock options, RSUs and PSUs            
Earnings per share:            
Antidilutive stock options, RSUs and PSUs (in shares) 0.2   0.2   0.1 0.1