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Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,668.4 $ 1,625.0
Accumulated amortization (1,117.2) (1,087.8)
Intangible assets 551.2 537.2
Permits and leasehold agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross 1,137.6 1,107.4
Accumulated amortization (716.2) (697.6)
Intangible assets 421.4 409.8
Franchise agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross 483.8 470.7
Accumulated amortization (364.0) (357.1)
Intangible assets 119.8 113.6
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross 47.0 46.9
Accumulated amortization (37.0) (33.1)
Intangible assets $ 10.0 $ 13.8