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Stock Transactions And Stock-Based Compensation - Option Activity Under The Company's Stock Plans (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Stock Options      
Outstanding at beginning of year (in shares) 8.1 8.0 1.7
Granted (in shares) 1.7 2.2 0.8
Exercised (in shares) (1.3) (1.0) (0.5)
Cancelled/forfeited (in shares) (0.6) (1.1) (0.1)
Conversion impact (in shares)     6.1
Outstanding at end of year (in shares) 7.9 8.1 8.0
Vested and expected to vest at end of year (in shares) 7.5    
Vested at end of year (in shares) 2.8    
Weighted Average Exercise Price      
Outstanding as of beginning of year (in USD per share) $ 20.08 $ 17.81 $ 75.43
Granted (in USD per share) 38.15 26.14  
Exercised (in USD per share) 15.74 14.01  
Cancelled/forfeited (in USD per share) 26.74 21.17  
Outstanding as of end of year (in USD per share) 24.16 $ 20.08 $ 17.81
Vested and expected to vest at end of year (in USD per share) 23.94    
Vested at end of year (in USD per share) $ 17.96    
Weighted Average Remaining Contractual Term (in years)      
Outstanding at end of year 7 years    
Vested and expected to vest at end of year 7 years    
Vested at end of year 5 years 4 months 24 days    
Aggregate Intrinsic Value      
Outstanding at end of year $ 165.0    
Vested and expected to vest at end of year 159.3    
Vested at end of year $ 74.6