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Equity and Earnings (Loss) Per Share - Narrative (Details) shares in Millions, $ in Millions		12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015 USD ($) shares	Dec. 31, 2017 USD ($)	Mar. 31, 2014 USD ($)
Earnings Per Share [Abstract]
Stock split conversion ratio	0.0667
Shares authorized to be repurchased (in shares)				$ 1,000.0
Shares repurchased (in shares) | shares		2.5
Aggregate purchase price of shares repurchased		$ 604.5
Dollar value of shares yet to be purchased			$ 395.9

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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