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Fair Value Disclosure (Details 2) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Assets    
Loans $ 29.6 $ 30.4
Carrying Value of Assets [Member]
   
Assets    
Investment Funds 2.5 2.7
Loans 29.1 30.4
Liabilities    
Recourse fixed rate debt 2,664.9 2,627.2
Recourse floating rate debt 663.3 727.6
Nonrecourse debt 136.5 149.4
Fair Value of Assets [Member]
   
Assets    
Investment Funds 5.9 7.4
Loans 29.8 30.7
Liabilities    
Recourse fixed rate debt 2,818.3 2,754.9
Recourse floating rate debt 654.3 714.8
Nonrecourse debt $ 145.8 $ 159.3