Goodwill and Other Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,697.8	$ 1,625.0
Accumulated Amortization	(1,146.9)	(1,087.8)
Intangible assets	550.9	537.2
Permits and leasehold agreements
Finite-Lived Intangible Assets [Line Items]
Gross	1,153.3	1,107.4	[1]
Accumulated Amortization	(735.7)	(697.6)
Intangible assets	417.6	409.8
Franchise agreements
Finite-Lived Intangible Assets [Line Items]
Gross	497.4	470.7
Accumulated Amortization	(371.1)	(357.1)
Intangible assets	126.3	113.6
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross	47.1	46.9	[1]
Accumulated Amortization	(40.1)	(33.1)
Intangible assets	$ 7.0	$ 13.8

[1] Includes additions associated with the Transaction (as defined below, see Note 11. Equity and Note 14. Acquisitions to the Consolidated Financial Statements).