CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenues	$ 661.6	$ 669.5	$ 1,326.5	$ 1,353.8
Cost of revenues	403.6	418.4	813.6	841.7
Gross profit	258.0	251.1	512.9	512.1
Selling, general and administrative expenses	227.5	220.9	443.5	436.9
Divestiture losses, net (Note 4)	0.0	54.2	0.0	59.2
Income (loss) from operations	30.5	(24.0)	69.4	16.0
Interest expense, net	(20.5)	(19.1)	(38.9)	(39.5)
Other expense, net	(0.1)	(0.6)	(0.1)	(0.4)
Income (loss) before income taxes	9.9	(43.7)	30.4	(23.9)
Income tax expense	(3.9)	(5.8)	(11.3)	(14.3)
Net income (loss)	6.0	(49.5)	19.1	(38.2)
Net income attributable to noncontrolling interests	0.0	0.0	0.0	(0.1)
Net income (loss) attributable to Stericycle, Inc. common shareholders	$ 6.0	$ (49.5)	$ 19.1	$ (38.3)
Income (loss) per common share attributable to Stericycle, Inc. common shareholders:
Basic (in dollars per share)	$ 0.06	$ (0.54)	$ 0.21	$ (0.41)
Diluted (in dollars per share)	$ 0.06	$ (0.54)	$ 0.21	$ (0.41)
Weighted average number of common shares outstanding:
Basic (in shares)	92.7	92.5	92.6	92.3
Diluted (in shares)	93.0	92.5	93.1	92.3