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Fair Value Disclosure (Details 3) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets    
Loans $ 27.2 $ 30.4
Carrying Amount [Member]
   
Assets    
Investment Funds 2.5 2.7
Loans 27.2 30.4
Liabilities    
Recourse fixed rate debt 2,343.3 2,627.2
Recourse floating rate debt 809.1 727.6
Nonrecourse debt 130.6 149.4
Fair Value [Member]
   
Assets    
Investment Funds 5.8 7.4
Loans 27.7 30.7
Liabilities    
Recourse fixed rate debt 2,513.4 2,754.9
Recourse floating rate debt 807.9 714.8
Nonrecourse debt $ 138.2 $ 159.3