Consolidated Statements of Redeemable Noncontrolling Interests, Preferred Stock and Equity (Unaudited) - USD ($) $ in Millions	Total	Series A Preferred Stock	Common stock	Redeemable Nonontrolling interest	Series A Preferred Stock	Common stock	Additional Paid-in Capital	Distribution in Excess of Earnings	Distribution in Excess of Earnings Series A Preferred Stock	Distribution in Excess of Earnings Common stock	Accumulated Other Comprehensive Loss
Redeemable noncontrolling interests, beginning of period at Dec. 31, 2024				$ 13.6
Series A Preferred Stock outstanding (shares) at Dec. 31, 2024					100,000
Series A Preferred Stock (dollars) at Dec. 31, 2024					$ 119.8
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss) attributable to redeemable noncontrolling interest				(0.1)
Adjustment to redeemable value of noncontrolling interests	$ (3.8)			3.8			$ (3.8)
Other				0.1
Redeemable noncontrolling interests, end of period at Mar. 31, 2025				17.4
Series A Preferred Stock outstanding (shares) at Mar. 31, 2025					100,000
Series A Preferred Stock (dollars) at Mar. 31, 2025					$ 119.8
Total stockholders' equity, beginning of period at Dec. 31, 2024	649.0					$ 1.7	2,493.6	$ (1,846.2)			$ (0.1)
Non-controlling interests, beginning of period at Dec. 31, 2024	1.6
Common stock outstanding (shares) at Dec. 31, 2024						166,000,000.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to OUTFRONT Media Inc.	(20.6)							(20.6)
Stock-based payments: Vested (shares)						1,900,000
Stock-based payments: Amortization	9.5						9.5
Shares paid for tax withholding for stock-based payments (shares)						(800,000)
Shares paid for tax withholding for stock-based payments	(14.9)						(14.9)
Dividends		$ (2.2)	$ (50.1)						$ (2.2)	$ (50.1)
Adjustment to redeemable value of noncontrolling interests	(3.8)			3.8			(3.8)
Total stockholders' equity, end of period at Mar. 31, 2025	566.9					$ 1.7	2,484.4	(1,919.1)			(0.1)
Non-controlling interests, end of period at Mar. 31, 2025	1.6
Common stock outstanding (shares) at Mar. 31, 2025						167,100,000
Redeemable noncontrolling interests, beginning of period at Dec. 31, 2025	22.0			22.0
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss) attributable to redeemable noncontrolling interest				0.2
Adjustment to redeemable value of noncontrolling interests	(3.6)			3.6			(3.6)
Redeemable noncontrolling interests, end of period at Mar. 31, 2026	25.8			25.8
Total stockholders' equity, beginning of period at Dec. 31, 2025	710.4					$ 1.8	2,619.3	(1,910.8)			0.1
Non-controlling interests, beginning of period at Dec. 31, 2025	$ 1.5
Common stock outstanding (shares) at Dec. 31, 2025	175,200,000					175,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to OUTFRONT Media Inc.	$ 19.1							19.1
Stock-based payments: Vested (shares)						1,500,000
Stock-based payments: Amortization	5.6						5.6
Shares paid for tax withholding for stock-based payments (shares)						(600,000)
Shares paid for tax withholding for stock-based payments	(16.7)						(16.7)
Dividends			$ (52.9)							$ (52.9)
Adjustment to redeemable value of noncontrolling interests	(3.6)			$ 3.6			(3.6)
Total stockholders' equity, end of period at Mar. 31, 2026	661.9					$ 1.8	$ 2,604.6	$ (1,944.6)			$ 0.1
Non-controlling interests, end of period at Mar. 31, 2026	$ 1.5
Common stock outstanding (shares) at Mar. 31, 2026	176,051,409					176,100,000