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Stockholders' Deficit (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Feb. 07, 2019
Treasury Stock Repurchase Programs [Line Items]
Additional share repurchase amount authorized		$ 602.9
Remaining common stock available for repurchase	$ 522.1	$ 522.1	$ 397.1
Common stock, held in treasury	235.4	235.4
Common stock repurchased	$ 10,000.0	$ 10,000.0
Share Buyback Program [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock authorized to repurchase			$ 1,000.0
Common stock repurchase, share	1.0	2.9
Average stock price	$ 204.13	$ 189.39
Aggregate cost of share	$ 194.0	$ 543.9
Restricted Stock Units [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock repurchase, share		0.2
Average stock price		$ 180.43
Aggregate cost of share		$ 39.6

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