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Fair Value Disclosure (Details 2) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Assets    
Loans $ 30.3 $ 30.4
Carrying Value of Assets [Member]
   
Assets    
Investment Funds 2.7 2.7
Loans 30.3 30.4
Liabilities    
Recourse fixed rate debt 2,429.9 2,627.2
Recourse floating rate debt 711.5 727.6
Nonrecourse debt 146.3 149.4
Fair Value of Assets [Member]
   
Assets    
Investment Funds 6.0 7.4
Loans 30.7 30.7
Liabilities    
Recourse fixed rate debt 2,550.0 2,754.9
Recourse floating rate debt 700.1 714.8
Nonrecourse debt $ 156.4 $ 159.3