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Loans To And Investments In Associated Companies (Jefferies LoanCore) (Narrative) (Details) - Jefferies LoanCore [Member] - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Investments In Associated Companies [Line Items]    
Funded Equity Commitments $ 125.6 $ 200.9
Equity commitment $ 291.0 $ 291.0
Percentage of voting interest 48.50% 48.50%
Aggregate equity commitment $ 600.0 $ 600.0