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Revenues Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Billboard $ 305.8 $ 280.4 $ 556.8 $ 519.7
Transit 154.1 121.3 274.8 219.9
Revenues 459.9 401.7 831.6 739.6
Static displays        
Disaggregation of Revenue [Line Items]        
Billboard 229.1 217.2 423.4 406.7
Transit 97.1 84.0 176.1 151.8
Digital displays        
Disaggregation of Revenue [Line Items]        
Billboard 66.2 53.3 113.2 95.2
Transit 28.4 14.0 45.0 24.7
Other        
Disaggregation of Revenue [Line Items]        
Billboard 10.5 9.9 20.2 17.8
Transit 12.9 10.3 21.7 17.6
Transit        
Disaggregation of Revenue [Line Items]        
Transit 138.4 108.3 242.8 194.1
Sports marketing and other        
Disaggregation of Revenue [Line Items]        
Transit $ 15.7 $ 13.0 $ 32.0 $ 25.8