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Affiliate Equity - Schedule of Changes in Redeemable Non-Controlling Interests (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Changes in redeemable non-controlling interests during the period  
Balance, as of December 31, 2013 $ 641.9
Transactions in Redeemable non-controlling interests (30.6)
Changes in redemption value 67.2
Balance, as of June 30, 2014 $ 678.5