CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenues	$ 690.3	$ 648.9	$ 2,034.4	$ 1,989.6
Cost of revenues	424.1	409.2	1,263.3	1,219.4
Gross profit	266.2	239.7	771.1	770.2
Selling, general and administrative expenses	215.6	279.4	676.5	695.2
Divestiture losses, net	0.0	10.9	0.0	10.9
Income (loss) from operations	50.6	(50.6)	94.6	64.1
Interest expense, net	(19.8)	(18.8)	(54.6)	(55.1)
Other income, net	2.3	0.5	0.8	0.5
Income (loss) before income taxes	33.1	(68.9)	40.8	9.5
Income tax (expense) benefit	(5.1)	3.0	(16.4)	(19.9)
Net income (loss)	28.0	(65.9)	24.4	(10.4)
Net income attributable to noncontrolling interests	0.0	(0.1)	(0.2)	(0.2)
Net income (loss) attributable to Stericycle, Inc. common shareholders	$ 28.0	$ (66.0)	$ 24.2	$ (10.6)
Earnings (loss) per common share attributable to Stericycle, Inc. common shareholders
Basic (in dollars per share)	$ 0.30	$ (0.72)	$ 0.26	$ (0.11)
Diluted (in dollars per share)	$ 0.30	$ (0.72)	$ 0.26	$ (0.11)
Weighted average number of common shares outstanding:
Basic (in shares)	92.2	91.9	92.1	91.8
Diluted (in shares)	92.4	91.9	92.4	91.8