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Intangible Assets Narrative (Details) - Intangible Assets $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) Displays	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,846.0		$ 1,836.7
Amortization	$ 14.8	$ 16.4
Series of Individually Immaterial Asset Acquisitions
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	13 years 4 months 24 days
Permits and leasehold agreements
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,311.8		$ 1,303.6
Permits and leasehold agreements | Series of Individually Immaterial Asset Acquisitions
Finite-Lived Intangible Assets [Line Items]
Gross	$ 6.1
Permits and leasehold agreements | Static and Digital Displays | Series of Individually Immaterial Asset Acquisitions
Finite-Lived Intangible Assets [Line Items]
Number of displays | Displays	15

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Number Of Displays

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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