Loans To And Investments In Associated Companies (Jefferies Finance) (Narrative) (Details) (Jefferies Finance [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Jefferies Finance [Member]
Investments In Associated Companies [Line Items]
Equity commitment	$ 600.0		$ 600.0
Total line of credit facility commitment under joint venture	700.0		700.0
Funded portion of line of credit commitment	0		0		123.8
Line of credit facility commitment of Jefferies	350.0		350.0		350.0
Funded Equity Commitments	331.1		331.1
Termination notice	60 days		60 days
Receivables	14.2		14.2		31.1
Net underwriting fees	38.8	35.2	86.4	35.2
Service fees	7.0	5.4	28.7	5.4
Origination fees	$ 3.4	$ 6.2	$ 7.7	$ 6.2