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Stockholders' Deficit (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Feb. 11, 2021
Feb. 06, 2020
Treasury Stock Repurchase Programs [Line Items]        
Additional share repurchase amount authorized   $ 747.0    
Remaining common stock available for repurchase $ 737.5 $ 737.5   $ 253.0
Common stock, held in treasury 242.1 242.1    
Common stock repurchased $ 11,340.0 $ 11,340.0    
Share Buyback Program [Member]        
Treasury Stock Repurchase Programs [Line Items]        
Common stock authorized to repurchase     $ 1,000.0  
Common stock repurchase, share 0.8 1.7    
Average stock price $ 216.48 $ 206.29    
Aggregate cost of share $ 172.5 $ 345.1    
Restricted Stock Units [Member]        
Treasury Stock Repurchase Programs [Line Items]        
Common stock repurchase, share   0.1    
Average stock price   $ 203.95    
Aggregate cost of share   $ 16.1