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Property Acquisitions, Discontinued Operations, Assets Held For Sale and Impairments (Fair value of assets acquired and liabilities assumed) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Jan. 31, 2012
Property Acquisitions, Discontinued Operations, And Assets Held For Sale [Abstract]    
Buildings and improvements $ 622.9  
Land 174.6  
Cash 3.9  
Restricted cash 0.7  
Intangible and other assets 16.0  
Total assets acquired 818.1  
Mortgage debt 298.8 [1]  
Other liabilities 8.2  
Total liabilities assumed 307.0  
Net assets acquired 511.1  
Debt assumed $ 26.2 $ 272.6
[1] (1) Mortgage debt assumed in the amount of $272.6 million was subsequently repaid in January 2012 at face value.