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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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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.

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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.

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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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- Definition

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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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