Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss) before allocation to non-controlling interests	$ (58.0)	$ 50.3	$ (51.7)	$ 56.4
Net income (loss) attributable to non-controlling interests	(0.1)	0.0	0.1	0.0
Net income (loss) attributable to OUTFRONT Media Inc.	(57.9)	50.3	(51.8)	56.4
Other comprehensive income (loss), net of tax:
Cumulative translation adjustments	4.4	4.6	(6.1)	7.2
Net actuarial gain (loss)	(0.2)	(0.1)	0.5	(0.1)
Change in fair value of interest rate swap agreements	0.7	(2.0)	(3.6)	(2.8)
Total other comprehensive income (loss), net of tax	4.9	2.5	(9.2)	4.3
Total comprehensive income (loss)	$ (53.0)	$ 52.8	$ (61.0)	$ 60.7