Related Party Transactions - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) joint_venture Displays	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) joint_venture Displays	Sep. 30, 2024 USD ($)	Jan. 18, 2033 USD ($)	Dec. 31, 2024 USD ($)	Jan. 18, 2023 USD ($)
Related Party Transaction [Line Items]
Operating lease assets	$ 1,513.0		$ 1,513.0			$ 1,503.8
Short-term operating lease liabilities	179.0		179.0			168.7
Operating lease liabilities	1,361.0		1,361.0			1,351.8
Billboard Revenue	352.8	$ 360.6	1,014.8	$ 1,062.8
Management fee revenue	0.9	1.0	2.2	3.2
Other Assets
Related Party Transaction [Line Items]
Equity method investments	8.9		8.9			$ 8.6
Minimum | 2 Times Square And 1600 Broadway
Related Party Transaction [Line Items]
Lessee, Operating Lease, Liability to be Paid Annually							$ 1.8
Maximum | 2 Times Square And 1600 Broadway | Forecast
Related Party Transaction [Line Items]
Lessee, Operating Lease, Liability to be Paid Annually					$ 3.5
Operating expense
Related Party Transaction [Line Items]
Operating lease expenses	$ 110.3	119.3	$ 331.0	362.3
LA Joint Venture
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%
Transit shelter joint ventures
Related Party Transaction [Line Items]
Equity method investment, number of investments | joint_venture	1		1
Acquired businesses
Related Party Transaction [Line Items]
Equity method investment, number of investments | joint_venture	2		2
Equity method investment, number of displays | Displays	9		9
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	$ 78.9		$ 78.9
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Operating lease assets		Operating lease assets
Short-term operating lease liabilities	$ 5.2		$ 5.2
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Short-term operating lease liabilities		Short-term operating lease liabilities
Operating lease liabilities	$ 84.6		$ 84.6
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Operating lease liabilities		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 | Operating expense
Related Party Transaction [Line Items]
Operating lease expenses	$ 2.9	2.8	$ 8.8	9.1
Beneficial Owner | Revenues
Related Party Transaction [Line Items]
Billboard Revenue	$ 2.7	$ 2.5	$ 8.8	$ 7.7