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Restructuring Charges - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.0	$ 19.8	$ 0.0	$ 19.8
Stock-based compensation			$ 12.5	17.7
Employee Severance
Restructuring Cost and Reserve [Line Items]
Severance Costs		17.6		17.6
Stock compensation plan
Restructuring Cost and Reserve [Line Items]
Stock-based compensation		2.2		2.2
Professional Fees
Restructuring Cost and Reserve [Line Items]
Professional Fees		2.2		2.2
Corporate and Reconciling Items
Restructuring Cost and Reserve [Line Items]
Restructuring charges		8.0		8.0
Operating segments \| Transit Operating Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges		3.6		3.6
Operating segments \| Billboard Operating Segment
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 8.2		$ 8.2