CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2.1	$ 28.0	$ (36.1)	$ 24.4
Other comprehensive (loss) income:
Currency translation adjustments	(21.8)	(65.4)	(7.8)	(120.3)
Cumulative currency translation loss realized from divestitures	1.0	0.0	70.6	0.0
Total other comprehensive (loss) income	(20.8)	(65.4)	62.8	(120.3)
Comprehensive (loss) income	(18.7)	(37.4)	26.7	(95.9)
Less: comprehensive income (loss) attributable to noncontrolling interests	0.1	(0.3)	(2.1)	(0.6)
Comprehensive (loss) income attributable to Stericycle, Inc. common shareholders	$ (18.8)	$ (37.1)	$ 28.8	$ (95.3)