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Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Gross $ 1,846.0 $ 1,836.7
Accumulated amortization (1,236.5) (1,221.8)
Intangible assets 609.5 614.9
Permits and leasehold agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross 1,311.8 1,303.6
Accumulated amortization (828.3) (816.5)
Intangible assets 483.5 487.1
Franchise agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross 529.3 528.2
Accumulated amortization (405.4) (402.7)
Intangible assets 123.9 125.5
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross 4.9 4.9
Accumulated amortization (2.8) (2.6)
Intangible assets $ 2.1 $ 2.3