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Initial Public Offering - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 9 Months Ended
Apr. 02, 2014
Jan. 15, 2014
Sep. 30, 2014
Sep. 30, 2013
Capital Unit [Line Items]        
Proceeds from IPO $ 615.0us-gaap_ProceedsFromIssuanceInitialPublicOffering   $ 615.0us-gaap_ProceedsFromIssuanceInitialPublicOffering $ 0us-gaap_ProceedsFromIssuanceInitialPublicOffering
Stock Issued During Period, Shares, New Issues   100us-gaap_StockIssuedDuringPeriodSharesNewIssues    
Distribution of IPO proceeds to CBS     2,038.8us-gaap_PaymentsOfCapitalDistribution 0us-gaap_PaymentsOfCapitalDistribution
Proceeds from Initial Public Offering Held for Payment Upon Election of REIT Status 100.0out_ProceedsfromInitialPublicOfferingHeldforPaymentUponElectionofREITStatus      
Common Stock        
Capital Unit [Line Items]        
Stock Issued During Period, Shares, New Issues 23,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
Shares Issued, Price Per Share $ 28us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
Shares Sold to Underwriter as Part of Total IPO | Common Stock        
Capital Unit [Line Items]        
Stock Issued During Period, Shares, New Issues 3,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= out_SharesSoldtoUnderwriterMember
     
IPO Proceeds        
Capital Unit [Line Items]        
Distribution of IPO proceeds to CBS $ 515.0us-gaap_PaymentsOfCapitalDistribution
/ us-gaap_SubsidiarySaleOfStockAxis
= out_IPOProceedsMember