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Stockholders' Deficit (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended
Feb. 10, 2022
Mar. 31, 2022
Treasury Stock Repurchase Programs [Line Items]    
Additional share repurchase amount authorized $ 705.4  
Remaining common stock available for repurchase 294.6 $ 892.6
Common stock, held in treasury   244.6
Common stock repurchased   $ 11,910.0
Share Buyback Program [Member]    
Treasury Stock Repurchase Programs [Line Items]    
Common stock authorized to repurchase $ 1,000.0  
Common stock repurchase, share   0.9
Average stock price   $ 218.50
Aggregate cost of share   $ 195.5
Restricted Stock Units [Member]    
Treasury Stock Repurchase Programs [Line Items]    
Average stock price   $ 214.35
Aggregate cost of share   $ 9.1