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Stock Compensation Plans (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Stock Compensation Plans:        
Stock compensation expense $ 164.0 $ 109.0 $ 540.0 $ 360.0
Stock options        
Stock Compensation Plans:        
Stock options granted in period (shares) 9,500 50,700 4,266,700 1,455,100
Award vesting period     3 years  
Award expiration period     10 years  
Unrecognized compensation cost $ 472.0   $ 472.0  
Remaining period over which to recognize unrecognized compensation expense     3 years  
Restricted stock        
Stock Compensation Plans:        
Awards other than stock options granted in period (shares) 0 0 10,300 6,800
Award vesting period     1 year  
Unrecognized compensation cost $ 2.0   $ 2.0  
Remaining period over which to recognize unrecognized compensation expense     7 months  
Restricted stock units        
Stock Compensation Plans:        
Awards other than stock options granted in period (shares) 10,900 175,600 1,546,800 618,700
Award vesting period     3 years  
Unrecognized compensation cost $ 524.0   $ 524.0  
Remaining period over which to recognize unrecognized compensation expense     2 years