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Revenues Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Billboard $ 328.8 $ 320.6
Transit 79.7 75.2
Revenues 408.5 395.8
Static displays    
Disaggregation of Revenue [Line Items]    
Billboard 222.8 215.1
Transit 38.7 38.8
Digital displays    
Disaggregation of Revenue [Line Items]    
Billboard 93.9 88.9
Transit 32.8 28.1
Other    
Disaggregation of Revenue [Line Items]    
Billboard 12.1 16.6
Transit 7.9 6.5
Transit    
Disaggregation of Revenue [Line Items]    
Transit 79.4 73.4
Other Revenues    
Disaggregation of Revenue [Line Items]    
Transit $ 0.3 $ 1.8