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Acquisitions - Allocation of intangible assets acquired (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Significant Acquisitions and Disposals [Line Items]
Intangible assets	620.4us-gaap_FiniteLivedIntangibleAssetsNet		$ 633.2us-gaap_FiniteLivedIntangibleAssetsNet
Acquired business
Significant Acquisitions and Disposals [Line Items]
Intangible assets	316.6us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = out_AcquiredBusinessMember	[1]
Permits and leasehold agreements
Significant Acquisitions and Disposals [Line Items]
Intangible assets	436.5us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember		442.0us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Permits and leasehold agreements | Acquired business
Significant Acquisitions and Disposals [Line Items]
Intangible assets	244.0us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = out_AcquiredBusinessMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Franchise agreements
Significant Acquisitions and Disposals [Line Items]
Intangible assets	148.0us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember		153.6us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember
Franchise agreements | Acquired business
Significant Acquisitions and Disposals [Line Items]
Intangible assets	34.8us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = out_AcquiredBusinessMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember
Advertising relationships | Acquired business
Significant Acquisitions and Disposals [Line Items]
Intangible assets	16.0us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = out_AcquiredBusinessMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Other
Significant Acquisitions and Disposals [Line Items]
Intangible assets	35.9us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember		37.6us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Other | Acquired business
Significant Acquisitions and Disposals [Line Items]
Intangible assets	21.8us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = out_AcquiredBusinessMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember
Minimum
Significant Acquisitions and Disposals [Line Items]
Finite-Lived Intangible Asset, Useful Life	28 days
Minimum | Permits and leasehold agreements
Significant Acquisitions and Disposals [Line Items]
Finite-Lived Intangible Asset, Useful Life	12 years
Minimum | Franchise agreements
Significant Acquisitions and Disposals [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Minimum | Advertising relationships
Significant Acquisitions and Disposals [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Minimum | Other
Significant Acquisitions and Disposals [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum
Significant Acquisitions and Disposals [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum | Permits and leasehold agreements
Significant Acquisitions and Disposals [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Maximum | Franchise agreements
Significant Acquisitions and Disposals [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Maximum | Advertising relationships
Significant Acquisitions and Disposals [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Maximum | Other
Significant Acquisitions and Disposals [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
[1] Intangible assets included with the preliminary purchase price allocation are as follows:

X

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

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+ References

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