Property and Equipment, Net - Summary of Property, Plant and Equipment (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Property and Equipment [Line Items]
Property and equipment	$ 2,208.1	$ 2,193.8
Less: Accumulated depreciation	1,550.3	1,527.6
Property and equipment, net	657.8	666.2
Land
Property and Equipment [Line Items]
Property and equipment	98.1	98.8
Buildings
Property and Equipment [Line Items]
Property and equipment	$ 47.6	$ 50.4
Buildings | Minimum
Property and Equipment [Line Items]
Property and equipment, useful life	20 years	20 years
Buildings | Maximum
Property and Equipment [Line Items]
Property and equipment, useful life	40 years	40 years
Advertising structures
Property and Equipment [Line Items]
Property and equipment	$ 1,869.9	$ 1,866.1
Advertising structures | Minimum
Property and Equipment [Line Items]
Property and equipment, useful life	5 years	5 years
Advertising structures | Maximum
Property and Equipment [Line Items]
Property and equipment, useful life	20 years	20 years
Furniture, equipment and other
Property and Equipment [Line Items]
Property and equipment	$ 162.3	$ 153.1
Furniture, equipment and other | Minimum
Property and Equipment [Line Items]
Property and equipment, useful life	3 years	3 years
Furniture, equipment and other | Maximum
Property and Equipment [Line Items]
Property and equipment, useful life	10 years	10 years
Construction in progress
Property and Equipment [Line Items]
Property and equipment	$ 30.2	$ 25.4