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Fair Value Disclosure (Details 3) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Assets    
Loans $ 24.4 $ 27.2
Carrying Amount [Member]
   
Assets    
Investment funds 1.9 2.5
Loans 24.4 27.2
Liabilities    
Recourse fixed rate debt 2,683.5 2,343.3
Recourse floating rate debt 862.9 809.1
Nonrecourse debt 103.0 130.6
Fair Value [Member]
   
Assets    
Investment funds 5.9 5.8
Loans 24.9 27.7
Liabilities    
Recourse fixed rate debt 2,801.3 2,513.4
Recourse floating rate debt 869.1 807.9
Nonrecourse debt $ 106.9 $ 138.2