Loans To And Investments In Associated Companies (Jefferies LoanCore) (Narrative) (Details) - Jefferies LoanCore [Member] - USD ($) $ in Millions	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Investments In Associated Companies [Line Items]
Percentage of equity interest transferred to new join venture partner	24.00%
Aggregate equity commitment	$ 400.0	$ 600.0
Funded equity commitments	78.3		$ 207.4
Equity commitment	$ 194.0		$ 291.0
Percentage of voting interest	48.50%		48.50%