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Segment Information - Reconciliation of Revenue from Segments to Consolidated (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Revenues $ 343.9us-gaap_Revenues $ 287.9us-gaap_Revenues
U.S.    
Segment Reporting Information [Line Items]    
Revenues 313.9us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
255.0us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
International    
Segment Reporting Information [Line Items]    
Revenues $ 30.0us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= out_InternationalMember
$ 32.9us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= out_InternationalMember