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Stock Compensation Plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Stock Compensation Plans:        
Stock compensation expense $ 90.0 $ 82.0 $ 180.0 $ 167.0
Stock options        
Stock Compensation Plans:        
Stock options granted in period (shares) 11,600 31,500 1,265,300 1,782,400
Award vesting period     3 years  
Award expiration period     10 years  
Unrecognized compensation cost $ 263.0   $ 263.0  
Remaining period over which to recognize unrecognized compensation expense     2 years  
Restricted stock        
Stock Compensation Plans:        
Awards other than stock options granted in period (shares) 6,000 8,100 6,000 8,100
Award vesting period     1 year  
Unrecognized compensation cost $ 3.0   $ 3.0  
Remaining period over which to recognize unrecognized compensation expense     10 months  
Restricted stock units        
Stock Compensation Plans:        
Awards other than stock options granted in period (shares) 7,600 13,200 415,900 686,900
Award vesting period     3 years  
Unrecognized compensation cost $ 309.0   $ 309.0  
Remaining period over which to recognize unrecognized compensation expense     2 years