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Fair Value Disclosure (Details 3) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Assets    
Loans $ 19.2 $ 0.5
Carrying Value of Assets [Member]
   
Assets    
Investment Funds 4.6 6.8
Loans 19.2 0.5
Liabilities    
Recourse fixed rate debt 2,535.0 2,459.3
Recourse floating rate debt 455.1 342.5
Nonrecourse debt 189.8 217.2
Fair Value [Member]
   
Assets    
Investment Funds 8.7 10.2
Loans 19.2 0.5
Liabilities    
Recourse fixed rate debt 2,694.2 2,615.9
Recourse floating rate debt 455.1 341.5
Nonrecourse debt $ 203.5 $ 233.0