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Fair Value Disclosure (Details 3) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets    
Loans $ 34.1 $ 27.2
Carrying Amount [Member]
   
Assets    
Investment funds 2.4 2.5
Loans 34.1 27.2
Liabilities    
Recourse fixed rate debt 2,835.6 2,343.3
Recourse floating rate debt 647.9 809.1
Nonrecourse debt 127.9 130.6
Fair Value [Member]
   
Assets    
Investment funds 5.6 5.8
Loans 34.8 27.7
Liabilities    
Recourse fixed rate debt 3,025.6 2,513.4
Recourse floating rate debt 659.0 807.9
Nonrecourse debt $ 134.4 $ 138.2