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Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,320.2 $ 1,345.1
Accumulated Amortization (1,000.1) (980.7)
Net 320.1 364.4
Permits and leasehold agreements
   
Finite-Lived Intangible Assets [Line Items]    
Gross 876.0 880.6
Accumulated Amortization (681.0) (659.0)
Net 195.0 221.6
Franchise agreements
   
Finite-Lived Intangible Assets [Line Items]    
Gross 442.1 462.4
Accumulated Amortization (317.9) (320.7)
Net 124.2 141.7
Other intangible assets
   
Finite-Lived Intangible Assets [Line Items]    
Gross 2.1 2.1
Accumulated Amortization (1.2) (1.0)
Net $ 0.9 $ 1.1