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Description of Business (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Dec. 31, 2013
Dec. 31, 2014
property
Sep. 30, 2013
Oct. 15, 2013
Organization And Description Of Business [Line Items]        
Number of properties   12us-gaap_NumberOfRealEstateProperties    
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare    
Common stock, shares issued 28,972,774us-gaap_CommonStockSharesIssued 29,408,138us-gaap_CommonStockSharesIssued 1,000us-gaap_CommonStockSharesIssued  
Net proceeds from issuance of shares $ 279us-gaap_ProceedsFromIssuanceOfCommonStock      
Ownership interest   79.60%us-gaap_EquityMethodInvestmentOwnershipPercentage    
Common Class A [Member]        
Organization And Description Of Business [Line Items]        
Common stock, par value       $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common stock, shares issued       14,087,500us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember