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Segment Information - Reconciliation of Assets from Segment to Consolidated (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Assets $ 3,522.8us-gaap_Assets $ 3,355.5us-gaap_Assets $ 3,464.9us-gaap_Assets
UNITED STATES      
Segment Reporting Information [Line Items]      
Assets 2,967.0us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= country_US		 3,027.6us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= country_US		 3,114.4us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
International      
Segment Reporting Information [Line Items]      
Assets 297.3us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= out_InternationalMember		 327.9us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= out_InternationalMember		 350.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= out_InternationalMember
Corporate      
Segment Reporting Information [Line Items]      
Assets $ 258.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember		 $ 0us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateNonSegmentMember