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Stockholders' Deficit (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 11, 2016	Sep. 30, 2016	Sep. 30, 2016
Treasury Stock Repurchase Programs [Line Items]
Additional share repurchase amount authorized	$ 611.2
Remaining common stock available for repurchase	$ 388.8	$ 588.9	$ 588.9
Common stock, held in treasury		219.0	219.0
Common stock repurchased		$ 8,000.0	$ 8,000.0
Share Buyback Program [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock authorized to repurchase		$ 1,000.0	$ 1,000.0
Common stock repurchase, share		2.2	5.8
Average stock price		$ 79.66	$ 82.72
Aggregate cost of share		$ 177.0	$ 476.8
Restricted Stock Units [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock repurchase, share			0.3
Average stock price			$ 80.87
Aggregate cost of share			$ 25.1

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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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