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Stockholders' Deficit (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Feb. 06, 2020
Treasury Stock Repurchase Programs [Line Items]
Additional share repurchase amount authorized	$ 747.0
Remaining common stock available for repurchase	$ 910.0	$ 253.0
Common stock, held in treasury	241.3
Common stock repurchased	$ 11,170.0
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	$ 197.02
Aggregate cost of share	$ 172.6
Restricted Stock Units [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock repurchase, share	0.1
Average stock price	$ 200.10
Aggregate cost of share	$ 12.8

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