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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