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Property and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Property and Equipment [Line Items]    
Property and equipment $ 1,957.2 $ 1,975.9
Less: accumulated depreciation 1,209.4 1,193.0
Property and equipment, net 747.8 782.9
Land    
Property and Equipment [Line Items]    
Property and equipment 91.6 88.1
Buildings    
Property and Equipment [Line Items]    
Property and equipment $ 47.0 47.0
Buildings | Minimum    
Property and Equipment [Line Items]    
Property, plant and equipment, useful life 20 years  
Buildings | Maximum    
Property and Equipment [Line Items]    
Property, plant and equipment, useful life 40 years  
Advertising structures    
Property and Equipment [Line Items]    
Property and equipment $ 1,710.4 1,745.6
Advertising structures | Minimum    
Property and Equipment [Line Items]    
Property, plant and equipment, useful life 5 years  
Advertising structures | Maximum    
Property and Equipment [Line Items]    
Property, plant and equipment, useful life 20 years  
Furniture, equipment and other    
Property and Equipment [Line Items]    
Property and equipment $ 83.1 78.1
Furniture, equipment and other | Minimum    
Property and Equipment [Line Items]    
Property, plant and equipment, useful life 3 years  
Furniture, equipment and other | Maximum    
Property and Equipment [Line Items]    
Property, plant and equipment, useful life 10 years  
Construction in progress    
Property and Equipment [Line Items]    
Property and equipment $ 25.1 $ 17.1