Related Party Transactions - Narrative (Details) $ in Millions		3 Months Ended		12 Months Ended	36 Months Ended
	Feb. 17, 2026 USD ($)	Mar. 31, 2026 USD ($) joint_venture Displays	Mar. 31, 2025 USD ($)	Dec. 31, 2026 USD ($)	Feb. 16, 2029 USD ($) numberOfPayments	Feb. 16, 2029	Jan. 18, 2033 USD ($)	Dec. 31, 2025 USD ($)	Jan. 18, 2023 USD ($)
Related Party Transaction [Line Items]
Operating lease assets		$ 1,553.8						$ 1,521.5
Short-term operating lease liabilities		179.5						172.9
Operating lease liabilities		1,398.9						1,374.7
Billboard Revenue		332.9	$ 310.7
Revenues		429.6	390.7
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Related Party Transaction [Line Items]
Equity method investments		8.6						$ 9.0
Management Service
Related Party Transaction [Line Items]
Revenues		0.6	0.6
AdQuick Agreement [Member]
Related Party Transaction [Line Items]
Investment, Acquisition Date	Feb. 17, 2026
Payments to Acquire Investments	$ 4.0
License fee		2.0
Investment Owned, Cost	$ 20.0
Subsequent event | AdQuick Agreement [Member]
Related Party Transaction [Line Items]
Payments to Acquire Investments					$ 4.0
Software License Contract Term						3 years
License fee				$ 17.0
Number Of Payments To Acquire Investments | numberOfPayments					4
Income Statement Location [Axis]: us-gaap:DirectOperatingCosts
Related Party Transaction [Line Items]
Operating lease expenses		111.4	109.4
Income Statement Location [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Related Party Transaction [Line Items]
Operating lease expenses		$ 3.2	2.9
LA Joint Venture
Related Party Transaction [Line Items]
Equity method investment, ownership percentage		50.00%
2 Times Square And 1600 Broadway | Minimum
Related Party Transaction [Line Items]
Lessee, Operating Lease, Liability to be Paid Annually									$ 1.8
2 Times Square And 1600 Broadway | Maximum | Forecast
Related Party Transaction [Line Items]
Lessee, Operating Lease, Liability to be Paid Annually							$ 3.5
Beneficial Owner
Related Party Transaction [Line Items]
Operating lease term (lessee)									10 years
Lessee, Operating Lease, Liability to be Paid Annually Years One Through Five									$ 8.5
Lessee, Operating Lease, Liability To Be Paid Annually, Years Six Through Ten									12.0
Lessee, Operating Lease, Liability To Be Paid, Year Five									10.0
Operating lease assets		$ 74.8
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Operating lease assets
Short-term operating lease liabilities		$ 6.2
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Short-term operating lease liabilities
Operating lease liabilities		$ 81.4
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Operating lease liabilities
Beneficial Owner | Minimum
Related Party Transaction [Line Items]
Total operating lease payments									22.0
Beneficial Owner | Maximum
Related Party Transaction [Line Items]
Total operating lease payments									$ 100.0
Beneficial Owner | Income Statement Location [Axis]: us-gaap:DirectOperatingCosts
Related Party Transaction [Line Items]
Operating lease expenses		$ 2.8	3.0
Beneficial Owner | Income Statement Location [Axis]: us-gaap:Revenues
Related Party Transaction [Line Items]
Billboard Revenue		$ 2.3	$ 3.0
Transit shelter joint ventures
Related Party Transaction [Line Items]
Equity method investment, number of investments | joint_venture		1
Acquired businesses
Related Party Transaction [Line Items]
Equity method investment, number of investments | joint_venture		2
Equity method investment, number of displays | Displays		9