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RELATED PARTY TRANSACTIONS (Fees and Income from Related Parties) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Related Party Transactions [Abstract]      
Property management and leasing fees $ 36.0 $ 24.5 $ 14.5
Commissions 10.0 8.0 24.2
Total related party revenue $ 46.0 $ 32.5 $ 38.7