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Related Party Transactions Related Party Revenue (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sponsors [Member] | Family Office Services [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties $ 0.10 $ 0.30
Accounts and Notes Receivable, Net [Member] | Partners and Shareholders [Member]
   
Related Party Transaction [Line Items]    
Due from related parties 0.1 0.1
Third party management and other fees [Member] | Sponsors [Member] | Supervisory Fee Revenue [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties 0.50 1.30
Third party management and other fees [Member] | Sponsors [Member] | Property Management Fee Revenue [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties 0.10 0.70
Third party management and other fees [Member] | Sponsors [Member] | Lease Commissions [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties 0 0.40
Third party management and other fees [Member] | Equity Method Investee [Member] | Supervisory Fee Revenue [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties 0 0.20
Third party management and other fees [Member] | Equity Method Investee [Member] | Property Management Fee Revenue [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties 0 0.07
Other income and fees [Member] | Sponsors [Member] | Profit Share [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties 0 0.40
Other income and fees [Member] | Sponsors [Member] | Other Fees and Disbursements from Non-Controlled Affiliates [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties 0 0.20
Other income and fees [Member] | Equity Method Investee [Member] | Profit Share [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties 0 0.10
Other income and fees [Member] | Equity Method Investee [Member] | Other Fees and Disbursements from Non-Controlled Affiliates [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties 0 0.40
Due from related parties   0.3
Other income and fees [Member] | Equity Method Investee [Member] | Other Fees Reimbursed on the Equity Method for Offering Costs Related to Offering [Member]
   
Related Party Transaction [Line Items]    
Revenue from related parties $ 0 $ 0.40