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Stockholders' Deficit (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Feb. 07, 2019
Treasury Stock Repurchase Programs [Line Items]
Additional share repurchase amount authorized		$ 602.9
Remaining common stock available for repurchase	$ 716.1	$ 716.1	$ 397.1
Common stock, held in treasury	234.4	234.4
Common stock repurchased	$ 9,800.0	$ 9,800.0
Share Buyback Program [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock authorized to repurchase			$ 1,000.0
Common stock repurchase, share	0.9	1.9
Average stock price	$ 195.27	$ 182.10
Aggregate cost of share	$ 175.0	$ 349.9
Restricted Stock Units [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock repurchase, share		0.2
Average stock price		$ 177.41
Aggregate cost of share		$ 34.6

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