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Stockholders' Deficit (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Feb. 11, 2016	Jun. 30, 2017	Jun. 30, 2017
Treasury Stock Repurchase Programs [Line Items]
Additional share repurchase amount authorized	$ 640.9
Remaining common stock available for repurchase	$ 359.1	$ 769.5	$ 769.5
Common stock, held in treasury		224.8	224.8
Common stock repurchased		$ 8,500.0	$ 8,500.0
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		1.7	3.5
Average stock price		$ 90.07	$ 85.99
Aggregate cost of share		$ 150.5	$ 300.6
Restricted Stock Units [Member]
Treasury Stock Repurchase Programs [Line Items]
Common stock repurchase, share			0.3
Average stock price			$ 83.13
Aggregate cost of share			$ 25.2

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

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-Topic 505
-SubTopic 30
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