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Property and Equipment - Summary of Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Property and Equipment [Line Items]    
Property and Equipment 1,962.4us-gaap_PropertyPlantAndEquipmentGross $ 1,975.9us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation 1,192.0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 1,193.0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 770.4us-gaap_PropertyPlantAndEquipmentNet 782.9us-gaap_PropertyPlantAndEquipmentNet
Land    
Property and Equipment [Line Items]    
Property and Equipment 92.0us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
88.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Building and Improvements    
Property and Equipment [Line Items]    
Property and Equipment 46.0us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
47.0us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Building and Improvements | Minimum    
Property and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 20 years  
Building and Improvements | Maximum    
Property and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 40 years  
Advertising Structures    
Property and Equipment [Line Items]    
Property and Equipment 1,724.0us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
1,745.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember
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 78.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
78.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
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 21.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 17.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember