CONDENSED CONSOLIDATED STATEMENTS OF LOSS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 598.2	$ 845.8	$ 1,383.2	$ 1,675.9
Cost of revenues	368.5	543.2	866.9	1,076.2
Gross profit	229.7	302.6	516.3	599.7
Selling, general and administrative expenses	201.0	277.0	459.7	562.8
Divestiture losses (gains), net	3.8	0.3	62.1	(5.1)
Goodwill impairment				20.9
Income (loss) from operations	24.9	25.3	(5.5)	21.1
Interest expense, net	(19.3)	(33.6)	(44.3)	(61.2)
Loss on early extinguishment of debt		(23.1)		(23.1)
Other expense, net	(1.0)	(1.8)	(3.9)	(4.0)
Income (loss) before income taxes	4.6	(33.2)	(53.7)	(67.2)
Income tax (expense) benefit	(8.7)	3.0	29.7	(0.6)
Net loss	(4.1)	(30.2)	(24.0)	(67.8)
Net income attributable to noncontrolling interests	0.4	0.3	0.6	0.5
Net loss attributable to Stericycle, Inc. common shareholders	$ (4.5)	$ (30.5)	$ (24.6)	$ (68.3)
Loss per common share attributable to Stericycle, Inc. common shareholders:
Basic	$ (0.05)	$ (0.33)	$ (0.27)	$ (0.75)
Diluted	$ (0.05)	$ (0.33)	$ (0.27)	$ (0.75)
Weighted average number of common shares outstanding:
Basic	91.4	91.0	91.4	90.9
Diluted	91.4	91.0	91.4	90.9