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Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Outstanding and nonvested, Beginning Balance, Number of Shares | [1] |  |  | 4,538 |  |
Granted, Number of Shares |  |  |  | 3,712 |  |
Vested, Number of Shares |  |  |  | (1,242) |  |
Forfeited, Number of Shares |  |  |  | (496) |  |
Outstanding and nonvested, Ending Balance, Number of Shares | [1] | 6,512 |  | 6,512 |  | 4,538
Number of Shares, Expected to vest | [2] | 5,912 |  | 5,912 |  |
Outstanding and nonvested, Beginning Balance, Weighted Average Grant Date Fair Value Per Share | [1] |  |  | $ 33.14 |  |
Granted, Weighted Average Grant Date Fair Value Per Share |  |  |  | 13.83 |  |
Vested, Weighted Average Grant Date Fair Value Per Share |  |  |  | 38.45 |  |
Forfeited, Weighted Average Grant Date Fair Value Per Share |  |  |  | 25.97 |  |
Outstanding and nonvested, Ending Balance, Weighted Average Grant Date Fair Value Per Share | [1] | $ 21.66 |  | 21.66 |  | $ 33.14
Expected to vest, Ending Balance, Weighted Average Grant Date Fair Value Per Share | [2] | $ 20.21 |  | $ 20.21 |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of Awards Outstanding, Beginning Balance | [3] |  |  | 3,074 |  |
Granted, Number of Awards |  |  | 0 | 1,659 | 0 |
Exercised, Number of Awards |  |  |  | (25) |  |
Forfeited, Number of Awards | [4] |  |  | (371) |  |
Number of Awards Outstanding, Ending Balance | [3] | 4,337 |  | 4,337 |  | 3,074
Number of Awards Exercisable, Ending Balance | [5] | 1,895 |  | 1,895 |  |
Number of Awards Vested and expected to vest, Ending Balance | [5] | 4,279 |  | 4,279 |  |
Weighted Average Exercise Price Per Award Outstanding, Beginning Balance | [3] |  |  | $ 24.21 |  |
Granted, Weighted Average Exercise Price Per Award |  |  |  | 16.17 |  |
Exercised, Weighted Average Exercise Price Per Award |  |  |  | 15.22 |  |
Forfeited, Weighted Average Exercise Price Per Award | [4] |  |  | 29.05 |  |
Weighted Average Exercise Price Per Award Outstanding, Ending Balance | [3] | $ 20.77 |  | 20.77 |  | $ 24.21
Exercisable, Weighted Average Exercise Price Per Award, Ending Balance | [5] | 27.41 |  | 27.41 |  |
Weighted Average Exercise Price Per Award, Vested and expected to vest, Ending Balance | [5] | $ 20.84 |  | $ 20.84 |  |
Weighted Average Remaining Contractual Term Outstanding | [3] |  |  | 6 years 3 months 18 days |  | 4 years 7 months 6 days
Exercisable Weighted Average Remaining Contractual Term | [5] |  |  | 2 years 3 months 18 days |  |
Weighted Average Remaining Contractual Term, Vested and expected to vest | [5] |  |  | 6 years 3 months 18 days |  |
Aggregate Intrinsic Value Outstanding | [3],[6] | $ 0.3 |  | $ 0.3 |  | $ 0.3
Exercisable, Aggregate Intrinsic Value | [5],[6] | 0.0 |  | 0.0 |  |
Aggregate Intrinsic Value, Vested and expected to vest | [5],[6] | $ 0.3 |  | $ 0.3 |  |
Granted, Weighted Average Grant Date Fair Value Per Share |  | $ 10.3 |  | $ 7.93 |  |
[1] | Includes 520,138 performance-based restricted stock units as of both September 30, 2023 and December 31, 2022, which represents the maximum amount that can vest.
[2] | Includes 68,300 performance-based restricted stock units.
[3] | Includes 0.7 million and 0.8 million performance condition SARs as of September 30, 2023 and December 31, 2022, respectively
[4] | Includes 0.1 million performance condition SARs
[5] | Includes 0.7 million performance condition SARs
[6] | The intrinsic value is the amount by which the current market value of the underlying stock exceeds the exercise price of the stock awards.

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