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Stockholders' Deficit (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Feb. 07, 2019
Treasury Stock Repurchase Programs [Line Items]
Additional share repurchase amount authorized	$ 602.9
Remaining common stock available for repurchase	$ 891.1	$ 397.1
Common stock, held in treasury	233.5
Common stock repurchased	$ 9,620.0
Share Buyback Program [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock authorized to repurchase		$ 1,000.0
Common stock repurchase, share	1.0
Average stock price	$ 170.59
Aggregate cost of share	$ 175.0
Restricted Stock Units [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock repurchase, share	0.2
Average stock price	$ 174.79
Aggregate cost of share	$ 29.3

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