CONDENSED CONSOLIDATED STATEMENTS OF (LOSS) INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Revenues	$ 648.4	$ 653.5	$ 1,974.9	$ 2,007.3
Cost of revenues	404.3	407.8	1,217.9	1,249.5
Gross profit	244.1	245.7	757.0	757.8
Selling, general and administrative expenses	224.6	217.3	668.1	654.2
Divestiture losses, net and impairments (Note 4)	10.5	4.2	10.5	63.4
Income from operations	9.0	24.2	78.4	40.2
Interest expense, net	(20.4)	(17.4)	(59.3)	(56.9)
Other income (expense), net	0.0	0.1	(0.1)	(0.3)
(Loss) income before income taxes	(11.4)	6.9	19.0	(17.0)
Income tax expense	(2.3)	(4.8)	(13.6)	(19.1)
Net (loss) income	(13.7)	2.1	5.4	(36.1)
Net income attributable to noncontrolling interests	(0.1)	(0.1)	(0.1)	(0.2)
Net (loss) income attributable to Stericycle, Inc. common shareholders	$ (13.8)	$ 2.0	$ 5.3	$ (36.3)
(Loss) income per common share attributable to Stericycle, Inc. common shareholders:
Basic (in dollars per share)	$ (0.15)	$ 0.02	$ 0.06	$ (0.39)
Diluted (in dollars per share)	$ (0.15)	$ 0.02	$ 0.06	$ (0.39)
Weighted average number of common shares outstanding:
Basic (in shares)	92.7	92.5	92.6	92.4
Diluted (in shares)	92.7	92.9	93.2	92.4