Long-Lived Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,734.6	$ 1,697.8
Accumulated amortization	(1,175.3)	(1,146.9)
Intangible assets	559.3	550.9
Permits and leasehold agreements
Finite-Lived Intangible Assets [Line Items]
Gross	1,185.4	1,153.3
Accumulated amortization	(755.7)	(735.7)
Intangible assets	429.7	417.6
Franchise agreements
Finite-Lived Intangible Assets [Line Items]
Gross	503.6	497.4
Accumulated amortization	(379.2)	(371.1)
Intangible assets	124.4	126.3
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross	45.6	47.1
Accumulated amortization	(40.4)	(40.1)
Intangible assets	$ 5.2	$ 7.0