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Stockholders' Deficit (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Jan. 30, 2015	Mar. 31, 2016	Feb. 11, 2016
Treasury Stock Repurchase Programs [Line Items]
Additional share repurchase amount authorized	$ 611.2
Remaining common stock available for repurchase		$ 915.8	$ 388.8
Common stock, held in treasury		215.0
Common stock repurchased		$ 7,700.0
Share Buyback Program [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock authorized to repurchase		$ 1,000.0
Common stock repurchase, share		1.8
Average stock price		$ 82.88
Aggregate cost of share		$ 149.9
Restricted Stock Units [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock repurchase, share		0.3
Average stock price		$ 80.44
Aggregate cost of share		$ 22.4

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Total cost of shares repurchased divided by the total number of shares repurchased.

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-SubTopic 30
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