CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 28.0	$ (65.9)	$ 24.4	$ (10.4)
Other comprehensive (loss) income:
Currency translation adjustments	(65.4)	(18.2)	(120.3)	(24.6)
Cumulative currency translation adjustment realized through disposition of Japan operations	0.0	3.8	0.0	3.8
Total other comprehensive loss	(65.4)	(14.4)	(120.3)	(20.8)
Comprehensive loss	(37.4)	(80.3)	(95.9)	(31.2)
Less: comprehensive loss (income) attributable to noncontrolling interests	(0.3)	0.1	(0.6)	0.2
Comprehensive loss attributable to Stericycle, Inc. common shareholders	$ (37.1)	$ (80.4)	$ (95.3)	$ (31.4)