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Affiliate Equity - Schedule of Changes in Redeemable Non-Controlling Interests (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Changes in redeemable non-controlling interests during the period
Balance, as of December 31, 2014	$ 645.5
Transactions in Redeemable non-controlling interests	(12.2)
Changes in redemption value	109.9
Balance, as of March 31, 2015	$ 743.2

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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