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Fair Value Disclosure of Financial Instruments (Textual) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fixed Rate Debt
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable $ 2,290.0 $ 732.4
Notes payable at fair value 2,300.0 777.8
Variable Rate Debt
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Notes payable 1,180.0 941.5
Notes payable at fair value $ 1,120.0 $ 860.1