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Earnings per Share - Components of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]                
Net income (loss) attributable to common stockholders $ 17 $ 44 $ 53 $ (1) $ (43) $ 168 $ 114 $ 124
Weighted average outstanding shares of common stock (in shares) 108.9     109.1     108.9 109.3
Dilutive effect of employee stock options, restricted stock and other stock awards (in shares) 4.5     0.0     4.2 1.6
Common stock and common stock equivalents (in shares) 113.4     109.1     113.1 110.9
Net income (loss) per share:                
Basic (in dollars per share) $ 0.16     $ (0.01)     $ 1.05 $ 1.13
Diluted (in dollars per share) $ 0.15     $ (0.01)     $ 1.01 $ 1.12