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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, 2018	Jun. 30, 2018	Feb. 08, 2018
Treasury Stock Repurchase Programs [Line Items]
Additional share repurchase amount authorized		$ 585.8
Remaining common stock available for repurchase	$ 813.3	$ 813.3	$ 414.2
Common stock, held in treasury	229.9	229.9
Common stock repurchased	$ 9,100.0	$ 9,100.0
Share Buyback Program [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock authorized to repurchase			$ 1,000.0
Common stock repurchase, share	1.0	2.0
Average stock price	$ 131.57	$ 122.62
Aggregate cost of share	$ 125.0	$ 249.9
Restricted Stock Units [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock repurchase, share		0.3
Average stock price		$ 118.91
Aggregate cost of share		$ 31.7

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