CONDENSED CONSOLIDATED STATEMENTS OF (LOSS) INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenues	$ 669.5	$ 679.8	$ 1,353.8	$ 1,344.0
Cost of revenues	418.4	419.3	841.7	839.0
Gross profit	251.1	260.5	512.1	505.0
Selling, general and administrative expenses	220.9	222.4	436.9	461.0
Total (Gain) Loss	54.2	0.0	59.2	0.0
(Loss) income from operations	(24.0)	38.1	16.0	44.0
Interest expense, net	(19.1)	(18.5)	(39.5)	(34.8)
Other expense, net	(0.6)	(0.7)	(0.4)	(1.5)
(Loss) income before income taxes	(43.7)	18.9	(23.9)	7.7
Income tax expense	(5.8)	(8.4)	(14.3)	(11.3)
Net (loss) income	(49.5)	10.5	(38.2)	(3.6)
Net (loss) income attributable to noncontrolling interests	0.0	0.0	(0.1)	(0.2)
Net (loss) income attributable to Stericycle, Inc. common shareholders	$ (49.5)	$ 10.5	$ (38.3)	$ (3.8)
(Loss) income per common share attributable to Stericycle, Inc. common shareholders:
Basic (in dollars per share)	$ (0.54)	$ 0.11	$ (0.41)	$ (0.04)
Diluted (in dollars per share)	$ (0.54)	$ 0.11	$ (0.41)	$ (0.04)
Weighted average number of common shares outstanding:
Basic (in shares)	92.5	92.1	92.3	92.0
Diluted (in shares)	92.5	92.2	92.3	92.0