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Intangible Assets Narrative (Details) - Intangible Assets
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Displays
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Displays
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Finite-Lived Intangible Assets [Line Items]          
Gross $ 2,059.2   $ 2,059.2   $ 1,836.7
Amortization 17.3 $ 16.3 $ 32.1 $ 32.7  
Series of Individually Immaterial Asset Acquisitions          
Finite-Lived Intangible Assets [Line Items]          
Intangible asset, useful life     16 years 6 months    
Permits and leasehold agreements          
Finite-Lived Intangible Assets [Line Items]          
Gross 1,522.0   $ 1,522.0   $ 1,303.6
Permits and leasehold agreements | Series of Individually Immaterial Asset Acquisitions          
Finite-Lived Intangible Assets [Line Items]          
Gross $ 220.0   $ 220.0    
Permits and leasehold agreements | Static and Digital Displays | Series of Individually Immaterial Asset Acquisitions | Minimum          
Finite-Lived Intangible Assets [Line Items]          
Approximate number of displays acquired | Displays 1,000   1,000