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Stockholders' Deficit (Summary of Common Stock Repurchase) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Equity [Abstract]    
Treasury Stock Shares Repurchased 1.0  
Treasury Stock Shares Repurchased for Tax Withholding and Other 0.1  
Common stock repurchase, share 1.1  
Aggregate cost of share $ 229.9  
Treasury stock, value, repurchased for tax withholding 11.7  
Payments for Repurchase of Common Stock $ 241.7 $ 269.9
Treasury stock shares repurchased, average cost per share $ 225.83  
Total repurchases for tax withholdings and other, average cost per share 229.19  
Average stock price $ 225.99