Commitments, Guarantees, And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
CommitmentsOutstandingtoBusinessDevelopmentCorporations	$ 63.3
CommitmentsOutstanding	76.0
Customer-owned securities pledged	263.8	140.3
Minimum margin deposit requirements	19.1
Auction rate securities, at par, held by retail clients after issuer redemptions and Stifel repurchases	18.3
Auction rate securities, repurchase period	2 years
Options Clearing Corporation [Member]
Customer-owned securities pledged	117.4
National Securities Clearing Corporation [Member]
Minimum margin deposit requirements	17.3
Minimum [Member]
Minimum margin deposit requirements	$ 85.1