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Stockholders' Deficit (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Feb. 06, 2020
Treasury Stock Repurchase Programs [Line Items]
Additional share repurchase amount authorized	$ 743.0
Remaining common stock available for repurchase	$ 825.6	$ 257.0
Common stock, held in treasury	237.9
Common stock repurchased	$ 10,480.0
Share Buyback Program [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock authorized to repurchase		$ 1,000.0
Common stock repurchase, share	1.3
Average stock price	$ 190.14
Aggregate cost of share	$ 245.0
Restricted Stock Units [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock repurchase, share	0.1
Average stock price	$ 209.40
Aggregate cost of share	$ 30.7

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