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Stockholders' Deficit (Summary of Common Stock Repurchase) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Equity [Abstract]      
Treasury Stock Shares Repurchased $ 1.0 $ 2.1  
Treasury Stock Shares Repurchased for Tax Withholding and Other $ 0.0 $ 0.1  
Common stock repurchase, share 1.0 2.1  
Treasury stock shares repurchased, average cost per share $ 219.82 $ 212.47  
Treasury stock, value, repurchased for tax withholding $ 2.9 $ 13.4  
Total repurchases for tax withholdings and other, average cost per share $ 225.59 $ 213.19  
Average stock price $ 219.90 $ 212.50  
Aggregate cost of share $ 220.0 $ 439.9  
Payments for Repurchase of Common Stock $ 222.9 $ 453.4 $ 556.1