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

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=out_InternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |