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Acquisitions and Dispositions - Allocation of intangible assets acquired (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Significant Acquisitions and Disposals [Line Items]    
Intangible assets $ 606.8 $ 633.2
Acquired business    
Significant Acquisitions and Disposals [Line Items]    
Intangible assets [1] 325.2  
Permits and leasehold agreements    
Significant Acquisitions and Disposals [Line Items]    
Intangible assets 429.4 442.0
Permits and leasehold agreements | Acquired business    
Significant Acquisitions and Disposals [Line Items]    
Intangible assets 252.0  
Franchise agreements    
Significant Acquisitions and Disposals [Line Items]    
Intangible assets 143.2 153.6
Franchise agreements | Acquired business    
Significant Acquisitions and Disposals [Line Items]    
Intangible assets 35.3  
Advertising relationships | Acquired business    
Significant Acquisitions and Disposals [Line Items]    
Intangible assets 16.0  
Other    
Significant Acquisitions and Disposals [Line Items]    
Intangible assets 34.2 $ 37.6
Other | Acquired business    
Significant Acquisitions and Disposals [Line Items]    
Intangible assets $ 21.9  
Minimum    
Significant Acquisitions and Disposals [Line Items]    
Finite-lived intangible asset, useful life 28 days  
Minimum | Permits and leasehold agreements    
Significant Acquisitions and Disposals [Line Items]    
Finite-lived intangible asset, useful life 12 years  
Minimum | Franchise agreements    
Significant Acquisitions and Disposals [Line Items]    
Finite-lived intangible asset, useful life 4 years  
Minimum | Advertising relationships    
Significant Acquisitions and Disposals [Line Items]    
Finite-lived intangible asset, useful life 7 years  
Minimum | Other    
Significant Acquisitions and Disposals [Line Items]    
Finite-lived intangible asset, useful life 1 year  
Maximum    
Significant Acquisitions and Disposals [Line Items]    
Finite-lived intangible asset, useful life 1 year  
Maximum | Permits and leasehold agreements    
Significant Acquisitions and Disposals [Line Items]    
Finite-lived intangible asset, useful life 20 years  
Maximum | Franchise agreements    
Significant Acquisitions and Disposals [Line Items]    
Finite-lived intangible asset, useful life 15 years  
Maximum | Advertising relationships    
Significant Acquisitions and Disposals [Line Items]    
Finite-lived intangible asset, useful life 7 years  
Maximum | Other    
Significant Acquisitions and Disposals [Line Items]    
Finite-lived intangible asset, useful life 5 years  
[1] Intangible assets included with the preliminary purchase price allocation are as follows:(in millions) Estimated Useful Life Intangible Assets AllocationPermits and leasehold agreements 12 - 20 years $252.0Franchise agreements 4 - 15 years 35.3Advertising relationships 7 years 16.0Other 1 - 5 years 21.9 $325.2