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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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