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Commitments And Contingencies (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Jul. 10, 2009
Notes issued to the entity surrendered for cancellation without any consideration
CLO 2005-2, mezzanine notes
Jul. 10, 2009
Notes issued to the entity surrendered for cancellation without any consideration
CLO 2006-1, mezzanine and junior notes
Commitments    
Aggregate commitments to purchase corporate loans$ 101.6$ 90.9  
Unfunded financing commitments for corporate loans8.231.6  
Unfunded financing commitments for private equity investments7.713.1  
Contingencies    
Value of debt surrendered for cancellation  $ 64.0$ 222.4