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Affiliate Equity - Schedule of the changes in redeemable non-controlling interests (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Changes in redeemable non-controlling interests during the period    
Beginning balance $ 477.5 $ 451.8
Transactions in Redeemable non-controlling interests (52.5) (17.2)
Changes in redemption value 216.9 42.9
Ending balance $ 641.9 $ 477.5