CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenues	$ 653.5	$ 690.3	$ 2,007.3	$ 2,034.4
Cost of revenues	407.8	424.1	1,249.5	1,263.3
Gross profit	245.7	266.2	757.8	771.1
Selling, general and administrative expenses	217.3	215.6	654.2	676.5
Divestiture losses, net	4.2	0.0	63.4	0.0
Income from operations	24.2	50.6	40.2	94.6
Interest expense, net	(17.4)	(19.8)	(56.9)	(54.6)
Other income (expense), net	0.1	2.3	(0.3)	0.8
Income (loss) before income taxes	6.9	33.1	(17.0)	40.8
Income tax expense	(4.8)	(5.1)	(19.1)	(16.4)
Net income (loss)	2.1	28.0	(36.1)	24.4
Net income attributable to noncontrolling interests	(0.1)	0.0	(0.2)	(0.2)
Net income (loss) attributable to Stericycle, Inc. common shareholders	$ 2.0	$ 28.0	$ (36.3)	$ 24.2
Income (loss) per common share attributable to Stericycle, Inc. common shareholders:
Basic (in dollars per share)	$ 0.02	$ 0.30	$ (0.39)	$ 0.26
Diluted (in dollars per share)	$ 0.02	$ 0.30	$ (0.39)	$ 0.26
Weighted average number of common shares outstanding:
Basic (in shares)	92.5	92.2	92.4	92.1
Diluted (in shares)	92.9	92.4	92.4	92.4