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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Fair Values of Options, Black-Scholes Option-Pricing Model, Weighted-Average Assumptions
The fair values of the options granted for the periods presented were estimated on the dates of grants using the Black-Scholes option-pricing model with the following weighted-average assumptions:
 Year Ended December 31,
 
2024
2023
2022
Risk-free interest rate 4.13 %4.26 %1.93 %
Expected volatility 48.05 %49.92 %48.89 %
Expected life (in years)5.085.125.14
Dividend yield — — — 
Stock Options Outstanding and Activity During the Period
The following table summarizes all stock option activity for the year ended December 31, 2024 (in millions, except per share amounts and time periods):
 
Options
Outstanding
Weighted- Average Exercise PriceWeighted- Average Remaining Contractual Term (Years)
Aggregate
Intrinsic
Value1
Balance as of December 31, 20231.1$41.38 5.8$51.3 
Granted0.1$85.18 
Exercised(0.3)$35.71 
Canceled/Forfeited(0.0)$61.44 
Expired(0.0)$28.64 
Balance as of December 31, 20240.9$47.54 5.6$51.2 
Vested and expected to vest after December 31, 20240.9$47.22 5.6$51.0 
Exercisable as of December 31, 20240.7$39.34 4.7$44.5 
1.Aggregate intrinsic value represents the difference between the closing fair value of the underlying common stock and the exercise price of outstanding, in-the-money options on the date of measurement.
Stock Option Grants, Vesting, and Exercises
The following table summarizes additional information on stock options for the periods presented (in millions, except per share amounts):
 Year Ended December 31,
 202420232022
Weighted-average fair value per share of stock options granted$40.34 $31.86 $26.50 
Total grant date fair value of stock options vested$2.7 $3.2 $2.7 
Total intrinsic value of stock options exercised$15.2 $10.9 $11.5 
Restricted Shares and Units Outstanding and Activity During the Period
The following table summarizes all RSU activity for the year ended December 31, 2024 (in millions, except grant date fair value amounts):
 
RSUs
Outstanding
Weighted-Average Grant Date Fair Value
Balance as of December 31, 20231.2$53.14 
Granted0.4$85.71 
Released
(0.3)$52.05 
Canceled/Forfeited(0.1)$60.93 
Balance as of December 31, 20241.2$62.91 
Vested and expected to vest after December 31, 20241
1.1$62.54 
1.As of December 31, 2024, outstanding awards with performance conditions were expected to vest at or below 100% of their original grant amount.
Schedule Of Restricted Stock Units Additional Information
The following table summarizes additional information regarding RSUs (in millions, except per share amounts):
 Year Ended December 31,
 202420232022
Weighted-average fair value per share of RSUs granted$85.71 $62.84 $50.63 
Total grant date fair value of RSUs vested$14.7 $20.1 $9.6 
Total intrinsic value of RSUs released$27.7 $38.6 $17.4