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Intangible Assets - Narrative (Details) - Intangible Assets $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) Displays | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) Displays | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | $ 2,513.4 |  | $ 2,513.4 |  | $ 2,489.8
Amortization | 17.3 | $ 21.5 | 34.9 | $ 43.3 |
Impairment charges | $ 8.8 | 511.4 | $ 17.9 | 511.4 |
Metropolitan Transportation Authority ("MTA") |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Impairment charges |  | $ 443.1 |  | $ 443.1 |
Series of Individually Immaterial Asset Acquisitions |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible asset, useful life | 14 years 7 months 6 days |  | 14 years 7 months 6 days |  |
Permits and leasehold agreements |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | $ 1,540.3 |  | $ 1,540.3 |  | $ 1,535.5
Permits and leasehold agreements | Series of Individually Immaterial Asset Acquisitions |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross | $ 5.2 |  | $ 5.2 |  |
Permits and leasehold agreements | Static and Digital Displays | Series of Individually Immaterial Asset Acquisitions |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Approximate number of displays acquired | Displays | 4 |  | 4 |  |

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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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482130/360-10-45-4 + Details
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