Stockholders' Deficit (Summary of Common Stock Repurchase) (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares
Equity [Abstract]
Treasury Stock Shares Repurchased	$ 1.1
Treasury Stock Shares Repurchased for Tax Withholding and Other	$ 0.1
Common stock repurchase, share | shares	1.1
Treasury stock shares repurchased, average cost per share | $ / shares	$ 205.60
Treasury stock, value, repurchased for tax withholding	$ 10.5
Total repurchases for tax withholdings and other, average cost per share | $ / shares	$ 210.01
Average stock price | $ / shares	$ 205.80
Aggregate cost of share	$ 220.0