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Property and Equipment, Net - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Property and Equipment [Line Items]    
Property and equipment $ 2,167.7 $ 2,089.2
Less: accumulated depreciation 1,501.9 1,436.3
Property and equipment, net 665.8 652.9
Land    
Property and Equipment [Line Items]    
Property and equipment 98.5 97.5
Buildings    
Property and Equipment [Line Items]    
Property and equipment $ 49.9 48.7
Buildings | Minimum    
Property and Equipment [Line Items]    
Property and equipment, useful life 20 years  
Buildings | Maximum    
Property and Equipment [Line Items]    
Property and equipment, useful life 40 years  
Advertising structures    
Property and Equipment [Line Items]    
Property and equipment $ 1,838.2 1,789.4
Advertising structures | Minimum    
Property and Equipment [Line Items]    
Property and equipment, useful life 5 years  
Advertising structures | Maximum    
Property and Equipment [Line Items]    
Property and equipment, useful life 20 years  
Furniture, equipment and other    
Property and Equipment [Line Items]    
Property and equipment $ 150.9 134.3
Furniture, equipment and other | Minimum    
Property and Equipment [Line Items]    
Property and equipment, useful life 3 years  
Furniture, equipment and other | Maximum    
Property and Equipment [Line Items]    
Property and equipment, useful life 10 years  
Construction in progress    
Property and Equipment [Line Items]    
Property and equipment $ 30.2 $ 19.3