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Fair Value Disclosure (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Assets    
Loans $ 30.4 $ 0.5
Carrying Value of Assets [Member]
   
Assets    
Investment Funds 2.7 6.8
Loans 30.4 0.5
Liabilities    
Recourse fixed rate debt 2,627.2 2,459.3
Recourse floating rate debt 727.6 342.5
Nonrecourse debt 149.4 217.2
Fair Value of Assets [Member]
   
Assets    
Investment Funds 7.4 10.2
Loans 30.7 0.5
Liabilities    
Recourse fixed rate debt 2,754.9 2,615.9
Recourse floating rate debt 714.8 341.5
Nonrecourse debt $ 159.3 $ 233.0