Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock	Additional paid-in capital	Distribution in excess of earnings	Accumulated Other Comprehensive Loss	Non-controlling interests	Acquired business	Acquired business Non-controlling interests	At-the-market equity offering program	At-the-market equity offering program Additional paid-in capital
Shares of common stock (shares) at Dec. 31, 2016		138,000,000.0
Total stockholders equity at Dec. 31, 2016	$ 1,232.9	$ 1.4	$ 1,949.5	$ (699.5)	$ (18.5)
Non-controlling interests at Dec. 31, 2016						$ 0.1
Total equity at Dec. 31, 2016	1,233.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to OUTFRONT Media Inc.	125.8			125.8
Net income attributable to non-controlling interests	0.0
Net income before allocation to non-controlling interests	125.8
Other comprehensive income (loss)	10.8				10.8
Other comprehensive income (loss) - total equity	10.8
Stock-based payments: Vested (shares)		700,000
Exercise of stock options (dollars)	1.2		1.2
Exercise of stock options (shares)		200,000
Stock-based payments: Amortization	20.5		20.5
Stock-based payments: Amortization | Adjustments for new accounting pronouncement			0.5	(0.5)
Shares paid for tax withholding for stock-based payments (shares)		(300,000)
Shares paid for tax withholding for stock-based payments (dollars)	(8.7)		(8.7)
Dividends	(201.4)			(201.4)
Shares of common stock (shares) at Dec. 31, 2017		138,600,000
Total stockholders’ equity at Dec. 31, 2017	1,181.1	$ 1.4	1,963.0	(775.6)	(7.7)
Non-controlling interests at Dec. 31, 2017						45.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	0.8					0.8	$ 44.6	$ 44.6
Total equity at Dec. 31, 2017	1,226.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to OUTFRONT Media Inc.	107.9			107.9
Net income attributable to non-controlling interests	0.0
Net income before allocation to non-controlling interests	107.9
Other comprehensive income (loss)	(14.3)				(14.3)
Other comprehensive income (loss) - total equity	(14.3)
Stock-based payments: Vested (shares)		1,000,000.0
Stock-based payments: Amortization	20.2		20.2
Shares paid for tax withholding for stock-based payments (shares)		(300,000)
Shares paid for tax withholding for stock-based payments (dollars)	(8.4)		(8.4)
Class A equity interest redemptions (shares)		200,000
Class A equity interest redemptions (dollars)	4.8		4.8
Non-controlling interests: Class A equity interest redemptions (dollars)						(4.8)
Shares issued under the ATM Program (shares)		700,000
Shares issued under the ATM Program (dollars)									$ 15.3	$ 15.3
Dividends	(203.9)			(203.9)
Other	$ 0.1	$ 0.1
Shares of common stock (shares) at Dec. 31, 2018	140,239,977	140,200,000
Total stockholders’ equity at Dec. 31, 2018	$ 1,102.8	$ 1.4	1,995.0	(871.6)	(22.0)
Non-controlling interests at Dec. 31, 2018	42.5					42.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners						1.8
Stockholders' Equity, Other	1.9
Total equity at Dec. 31, 2018	1,145.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of a new accounting standard	(24.8)			(24.8)
Net income attributable to OUTFRONT Media Inc.	140.1			140.1
Net income attributable to non-controlling interests	0.5
Net income before allocation to non-controlling interests	140.6
Other comprehensive income (loss)	4.3				4.3
Other comprehensive income (loss) - total equity	4.3
Stock-based payments: Vested (shares)		1,000,000.0
Stock-based payments: Amortization	22.3		22.3
Shares paid for tax withholding for stock-based payments (shares)		(400,000)
Shares paid for tax withholding for stock-based payments (dollars)	(7.9)		(7.9)
Class A equity interest redemptions (shares)		600,000
Class A equity interest redemptions (dollars)	$ 14.3		14.3
Non-controlling interests: Class A equity interest redemptions (dollars)						(14.3)
Shares issued under the ATM Program (shares)	8,526	2,200,000							2,150,000
Shares issued under the ATM Program (dollars)									$ 50.8	$ 50.8
Dividends	$ (208.3)			(208.3)
Other	$ 0.2		0.2
Shares of common stock (shares) at Dec. 31, 2019	143,594,117	143,600,000
Total stockholders’ equity at Dec. 31, 2019	$ 1,093.8	$ 1.4	$ 2,074.7	$ (964.6)	$ (17.7)
Non-controlling interests at Dec. 31, 2019	32.6					32.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners						$ 3.9
Stockholders' Equity, Other	4.1
Total equity at Dec. 31, 2019	$ 1,126.4