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Fair Value Disclosure - Fair Value Other Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Assets    
Loans $ 28.0 $ 30.4
Carrying Value of Assets [Member]
   
Assets    
Investment funds 2.5 2.7
Loans 28.0 30.4
Liabilities    
Recourse fixed rate debt 2,661.4 2,627.2
Recourse floating rate debt 686.0 727.6
Nonrecourse debt 133.3 149.4
Fair Value of Assets [Member]
   
Assets    
Investment funds 5.8 7.4
Loans 28.5 30.7
Liabilities    
Recourse fixed rate debt 2,830.0 2,754.9
Recourse floating rate debt 683.6 714.8
Nonrecourse debt $ 142.2 $ 159.3