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Related Party Transactions - Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Related Party Transaction [Line Items]      
Equity method investment, ownership percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage    
Equity Method Investments $ 24.2us-gaap_EquityMethodInvestments   $ 27.0us-gaap_EquityMethodInvestments
Management fee revenue 1.5us-gaap_ManagementFeesRevenue 0.9us-gaap_ManagementFeesRevenue  
Revenues 343.9us-gaap_Revenues 287.9us-gaap_Revenues  
CBS Corp.      
Related Party Transaction [Line Items]      
Selling, General and Administrative Expenses from Transactions with Related Party   6.4us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember
 
Revenues   1.9us-gaap_Revenues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember
 
Accounts Receivable, Related Parties, Current     0us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember
Accounts Payable, Related Parties, Current     0.2us-gaap_AccountsPayableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_MajorityShareholderMember
Other Related Parties      
Related Party Transaction [Line Items]      
Revenues   $ 1.6us-gaap_Revenues
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
 
Transit shelter joint ventures      
Related Party Transaction [Line Items]      
Equity Method Investment, Number of Investments 2out_EquityMethodInvestmentNumberofInvestments
/ out_EquityMethodInvestmentAxis
= out_JCDecauxMember
   
Acquired joint ventures      
Related Party Transaction [Line Items]      
Equity Method Investment, Number of Investments 4out_EquityMethodInvestmentNumberofInvestments
/ out_EquityMethodInvestmentAxis
= out_AcquiredBusinessMember