CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (13.7)	$ 2.1	$ 5.4	$ (36.1)
Other comprehensive income (loss):
Currency translation adjustments	26.6	(21.8)	13.5	(7.8)
Cumulative currency translation loss realized from divestitures	0.0	1.0	0.0	70.6
Total other comprehensive income (loss)	26.6	(20.8)	13.5	62.8
Comprehensive income (loss)	12.9	(18.7)	18.9	26.7
Less: comprehensive income (loss) attributable to noncontrolling interests	0.0	0.1	0.0	(2.1)
Comprehensive income (loss) attributable to Stericycle, Inc. common shareholders	$ 12.9	$ (18.8)	$ 18.9	$ 28.8