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Segment Information - Reconciliation of Assets from Segment to Consolidated (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Total assets $ 4,057.2us-gaap_Assets $ 4,023.6us-gaap_Assets
U.S.    
Segment Reporting Information [Line Items]    
Total assets 3,725.1us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
3,704.2us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
International    
Segment Reporting Information [Line Items]    
Total assets 264.3us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= out_InternationalMember
270.4us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= out_InternationalMember
Corporate    
Segment Reporting Information [Line Items]    
Total assets $ 67.8us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
$ 49.0us-gaap_Assets
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember