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Revenues Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Disaggregation of Revenue [Line Items]        
Billboard $ 312.0 $ 290.6 $ 868.8 $ 810.3
Transit 150.5 123.6 425.3 343.5
Revenues 462.5 414.2 1,294.1 1,153.8
Static displays        
Disaggregation of Revenue [Line Items]        
Billboard 234.7 223.9 658.1 630.6
Transit 94.1 87.0 270.2 238.8
Digital displays        
Disaggregation of Revenue [Line Items]        
Billboard 65.8 57.4 179.0 152.6
Transit 27.6 15.2 72.6 39.9
Other        
Disaggregation of Revenue [Line Items]        
Billboard 11.5 9.3 31.7 27.1
Transit 11.6 9.6 33.3 27.2
Transit        
Disaggregation of Revenue [Line Items]        
Transit 133.3 111.8 376.1 305.9
Sports marketing and other        
Disaggregation of Revenue [Line Items]        
Transit $ 17.2 $ 11.8 $ 49.2 $ 37.6