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Unconsolidated Investments (Schedule of Unconsolidated Investments) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]    
Investments in joint ventures $ 473.3 $ 751.4
Investments in loan pool participations 58.9 34.7
Total $ 532.2 $ 786.1