Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net income (loss) before allocation to redeemable and non-redeemable noncontrolling interests	$ 19.3	$ (20.7)
Net income (loss) attributable to redeemable and non-redeemable noncontrolling interests	0.2	(0.1)
Net income (loss) attributable to OUTFRONT Media Inc.	19.1	(20.6)
Total comprehensive income (loss)	$ 19.1	$ (20.6)