Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income before allocation to non-controlling interests	$ 140.6	$ 107.9	$ 125.8
Net income attributable to non-controlling interests	0.5	0.0	0.0
Net income attributable to OUTFRONT Media Inc.	140.1	107.9	125.8
Other comprehensive income (loss), net of tax:
Cumulative translation adjustments	8.2	(14.5)	11.8
Net actuarial gain (loss)	(1.7)	2.6	(1.0)
Change in fair value of interest rate swap agreements	(2.2)	(2.4)	0.0
Total other comprehensive income (loss), net of tax	4.3	(14.3)	10.8
Total comprehensive income	$ 144.4	$ 93.6	$ 136.6