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Revenues Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disaggregation of Revenue [Line Items]        
Billboard $ 373.4 $ 371.6 $ 702.2 $ 692.2
Transit 103.9 97.2 183.6 172.4
Revenues 477.3 468.8 885.8 864.6
Static displays        
Disaggregation of Revenue [Line Items]        
Billboard 243.5 244.5 466.3 459.6
Transit 51.8 52.1 90.5 90.9
Digital displays        
Disaggregation of Revenue [Line Items]        
Billboard 117.4 113.9 211.3 202.8
Transit 43.0 35.1 75.8 63.2
Other        
Disaggregation of Revenue [Line Items]        
Billboard 12.5 13.2 24.6 29.8
Transit 9.0 8.1 16.9 14.6
Transit        
Disaggregation of Revenue [Line Items]        
Transit 103.8 95.3 183.2 168.7
Other Revenues        
Disaggregation of Revenue [Line Items]        
Transit $ 0.1 $ 1.9 $ 0.4 $ 3.7