v3.26.3
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, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding and nonvested as of December 31, 2025, Number of Shares [1]     4,566    
Granted, Number of Shares [2]     1,457    
Vested, Number of Shares     (1,889)    
Forfeited, Number of Shares [3]     (140)    
Outstanding and nonvested as of September 30, 2026, Number of Shares [1] 3,994   3,994   4,566
Expected to vest as of September 30, 2026, Number of Shares [4] 3,542   3,542    
Outstanding and nonvested as of December 31, 2025, Weighted Average Grant Date Fair Value Per Share [1]     $ 9.67    
Granted, Weighted Average Grant Date Fair Value Per Share [2]     18.81    
Vested, Weighted Average Grant Date Fair Value Per Share     10.92    
Forfeited, Weighted Average Grant Date Fair Value Per Share [3]     11.78    
Outstanding and nonvested as of September 30, 2026, Weighted Average Grant Date Fair Value Per Share [1] $ 12.34   12.34   $ 9.67
Expected to vest as of September 30, 2026, Weighted Average Grant Date Fair Value Per Share [4] $ 12.09   $ 12.09    
Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of Awards Outstanding, Beginning Balance [5]     13,249    
Granted, Number of Awards     1,004    
Exercised, Number of Awards [6]     (479)    
Forfeited, Number of Awards [7]     (519)    
Number of Awards Outstanding, Ending Balance [5] 13,255   13,255   13,249
Number of Awards Exercisable, Ending Balance [8] 6,856   6,856    
Number of Awards Vested and expected to vest, Ending Balance [8] 9,785   9,785    
Weighted Average Exercise Price Per Award Outstanding, Beginning Balance [5]     $ 11.07    
Granted, Weighted Average Exercise Price Per Award     18.52    
Exercised, Weighted Average Exercise Price Per Award [6]     9.04    
Forfeited, Weighted Average Exercise Price Per Award [7]     27.28    
Weighted Average Exercise Price Per Award Outstanding, Ending Balance [5] $ 11.07   11.07   $ 11.07
Exercisable, Weighted Average Exercise Price Per Award, Ending Balance [8] 12.31   12.31    
Weighted Average Exercise Price Per Award, Vested and expected to vest, Ending Balance [8] $ 12.12   $ 12.12    
Weighted Average Remaining Contractual Term Outstanding [5]     6 years 7 months 6 days   7 years
Exercisable Weighted Average Remaining Contractual Term [8]     6 years 9 months 18 days    
Weighted Average Remaining Contractual Term, Vested and expected to vest [8]     7 years 4 months 24 days    
Aggregate Intrinsic Value Outstanding [5],[9] $ 36.0   $ 36.0   $ 45.4
Exercisable, Aggregate Intrinsic Value [8],[9] 14.3   14.3    
Aggregate Intrinsic Value, Vested and expected to vest [8],[9] $ 22.0   $ 22.0    
Granted, Weighted Average Grant Date Fair Value Per Share $ 0 $ 0 $ 10.13 $ 4.14  
[1] Includes 2.8 million and 1.6 million performance-based restricted stock units as of September 30, 2026 and December 31, 2025, respectively, which represents the maximum amount that can vest.
[2] Includes 1.3 million performance-based restricted stock units.
[3] Includes less than 0.1 million performance-based restricted stock units.
[4] Includes 2.4 million performance-based restricted stock units.
[5] Includes 3.6 million and 3.9 million performance condition SARs as of September 30, 2026 and December 31, 2025, respectively.
[6] Includes 0.1 million performance condition SARs.
[7] Includes 0.2 million performance condition SARs.
[8] Includes 0.2 million performance condition SARs.
[9] The intrinsic value is the amount by which the current market value of the underlying stock exceeds the exercise price of the stock awards.