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, 2023				$ 31.3
Series A Preferred Stock outstanding (shares) at Dec. 31, 2023					100,000
Series A Preferred Stock (dollars) at Dec. 31, 2023					$ 119.8
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss) attributable to redeemable noncontrolling interest				0.6
Purchase of non-controlling interest	$ 0.3			(24.6)			$ 0.3
Adjustment to redeemable value of noncontrolling interests	(6.8)			6.8			(6.8)
Other				(0.6)
Redeemable noncontrolling interests, end of period at Sep. 30, 2024				13.5
Series A Preferred Stock outstanding (shares) at Sep. 30, 2024					100,000
Series A Preferred Stock (dollars) at Sep. 30, 2024					$ 119.8
Total stockholders' equity, beginning of period at Dec. 31, 2023	577.3					$ 1.7	2,402.5	$ (1,821.1)			$ (5.8)
Non-controlling interests, beginning of period at Dec. 31, 2023	1.7
Common stock outstanding (shares) at Dec. 31, 2023						161,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to OUTFRONT Media Inc.	184.2							184.2
Net income (loss) attributable to non-redeemable noncontrolling interest	(0.1)
Other comprehensive income (loss)	5.5										5.5
Stock-based payments: Vested (shares)						1,500,000
Stock-based payments: Amortization	21.8						21.8
Shares paid for tax withholding for stock-based payments (shares)						(600,000)
Shares paid for tax withholding for stock-based payments	(7.7)						(7.7)
Purchase of non-controlling interest	0.3			(24.6)			0.3
Dividends		$ (6.6)	$ (149.8)						$ (6.6)	$ (149.8)
Adjustment to redeemable value of noncontrolling interests	(6.8)			6.8			(6.8)
Total stockholders' equity, end of period at Sep. 30, 2024	618.2					$ 1.7	2,410.1	(1,793.3)			(0.3)
Non-controlling interests, end of period at Sep. 30, 2024	1.6
Common stock outstanding (shares) at Sep. 30, 2024						162,000,000.0
Redeemable noncontrolling interests, beginning of period at Jun. 30, 2024				38.2
Series A Preferred Stock outstanding (shares) at Jun. 30, 2024					100,000
Series A Preferred Stock (dollars) at Jun. 30, 2024					$ 119.8
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income (loss) attributable to redeemable noncontrolling interest				0.3
Purchase of non-controlling interest	0.3			(24.6)			0.3
Adjustment to redeemable value of noncontrolling interests	(0.3)			0.3			(0.3)
Other				(0.7)
Redeemable noncontrolling interests, end of period at Sep. 30, 2024				13.5
Series A Preferred Stock outstanding (shares) at Sep. 30, 2024					100,000
Series A Preferred Stock (dollars) at Sep. 30, 2024					$ 119.8
Total stockholders' equity, beginning of period at Jun. 30, 2024	628.7					$ 1.7	2,403.1	(1,775.8)			(0.3)
Non-controlling interests, beginning of period at Jun. 30, 2024	1.6
Common stock outstanding (shares) at Jun. 30, 2024						162,000,000.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to OUTFRONT Media Inc.	34.6							34.6
Net income (loss) attributable to non-redeemable noncontrolling interest	(0.1)
Other comprehensive income (loss)	0.0
Stock-based payments: Amortization	7.0						7.0
Purchase of non-controlling interest	0.3			(24.6)			0.3
Dividends		(2.2)	(49.9)						(2.2)	(49.9)
Adjustment to redeemable value of noncontrolling interests	(0.3)			0.3			(0.3)
Other	(0.1)
Total stockholders' equity, end of period at Sep. 30, 2024	618.2					$ 1.7	2,410.1	(1,793.3)			(0.3)
Non-controlling interests, end of period at Sep. 30, 2024	1.6
Common stock outstanding (shares) at Sep. 30, 2024						162,000,000.0
Redeemable noncontrolling interests, beginning of period at Dec. 31, 2024	$ 13.6			13.6
Series A Preferred Stock outstanding (shares) at Dec. 31, 2024	100,000				100,000
Series A Preferred Stock (dollars) at Dec. 31, 2024	$ 119.8				$ 119.8
Increase (Decrease) in Temporary Equity [Roll Forward]
Adjustment to redeemable value of noncontrolling interests	(5.9)			5.9			(5.9)
Other				0.1
Redeemable noncontrolling interests, end of period at Sep. 30, 2025	$ 19.6			19.6
Series A Preferred Stock outstanding (shares) at Sep. 30, 2025	125,000				100,000
Series A Preferred Stock (dollars) at Sep. 30, 2025	$ 119.8				$ 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					166,000,000.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to OUTFRONT Media Inc.	$ 50.2							50.2
Other comprehensive income (loss)	(0.1)										(0.1)
Stock-based payments: Vested (shares)						2,100,000
Stock-based payments: Amortization	23.3						23.3
Shares paid for tax withholding for stock-based payments (shares)						(900,000)
Shares paid for tax withholding for stock-based payments	(16.5)						(16.5)
Dividends		(6.6)	(150.8)						(6.6)	(150.8)
Adjustment to redeemable value of noncontrolling interests	(5.9)			5.9			(5.9)
Other	(0.1)
Total stockholders' equity, end of period at Sep. 30, 2025	542.6					$ 1.7	2,494.5	(1,953.4)			(0.2)
Non-controlling interests, end of period at Sep. 30, 2025	$ 1.5
Common stock outstanding (shares) at Sep. 30, 2025	167,234,469					167,200,000
Redeemable noncontrolling interests, beginning of period at Jun. 30, 2025				19.4
Series A Preferred Stock outstanding (shares) at Jun. 30, 2025					100,000
Series A Preferred Stock (dollars) at Jun. 30, 2025					$ 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	$ (0.2)			0.2			(0.2)
Other				(0.1)
Redeemable noncontrolling interests, end of period at Sep. 30, 2025	$ 19.6			19.6
Series A Preferred Stock outstanding (shares) at Sep. 30, 2025	125,000				100,000
Series A Preferred Stock (dollars) at Sep. 30, 2025	$ 119.8				$ 119.8
Total stockholders' equity, beginning of period at Jun. 30, 2025	539.1					$ 1.7	2,489.8	(1,952.3)			(0.1)
Non-controlling interests, beginning of period at Jun. 30, 2025	1.5
Common stock outstanding (shares) at Jun. 30, 2025						167,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to OUTFRONT Media Inc.	51.3							51.3
Other comprehensive income (loss)	(0.1)										(0.1)
Stock-based payments: Vested (shares)						200,000
Stock-based payments: Amortization	5.6						5.6
Shares paid for tax withholding for stock-based payments (shares)						(100,000)
Shares paid for tax withholding for stock-based payments	(0.7)						(0.7)
Dividends		$ (2.2)	$ (50.2)						$ (2.2)	$ (50.2)
Adjustment to redeemable value of noncontrolling interests	(0.2)			$ 0.2			(0.2)
Total stockholders' equity, end of period at Sep. 30, 2025	542.6					$ 1.7	$ 2,494.5	$ (1,953.4)			$ (0.2)
Non-controlling interests, end of period at Sep. 30, 2025	$ 1.5
Common stock outstanding (shares) at Sep. 30, 2025	167,234,469					167,200,000