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Stock-Based Compensation - Restricted Stock Units (RSUs) (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stock-Based Compensation      
Award vesting period 3 years    
Units      
Non-vested at beginning of period (in shares) 856,917    
Granted (in shares) 1,031,469    
Forfeited (in shares) (284,076)    
Vested (in shares) (393,470)    
Non-vested at end of period (in shares) 1,210,840 856,917  
Weighted Average Grant Date Fair Value per Unit      
Non-vested at beginning of period (in usd per share) $ 40.25    
Granted (in usd per share) 35.71 $ 41.26 $ 39.00
Forfeited (in usd per share) 34.70    
Vested (in usd per share) 39.67    
Non-vested at end of period (in usd per share) $ 37.88 $ 40.25  
Vested in period, fair value $ 20 $ 10 $ 12
Weighted average grant date fair value (in usd per share) $ 35.71 $ 41.26 $ 39.00