CONDENSED CONSOLIDATED STATEMENTS OF (LOSS) INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenues	$ 845.8	$ 883.3	$ 1,675.9	$ 1,778.3
Cost of revenues	543.2	530.0	1,076.2	1,066.5
Gross profit	302.6	353.3	599.7	711.8
Selling, general and administrative expenses	277.3	290.9	557.7	595.3
Goodwill impairment	0.0		20.9
Income from operations	25.3	62.4	21.1	116.5
Interest expense, net	(33.6)	(24.6)	(61.2)	(49.6)
Loss on early extinguishment of debt	(23.1)		(23.1)
Other expense, net	(1.8)	(0.6)	(4.0)	(0.6)
(Loss) Income before income taxes	(33.2)	37.2	(67.2)	66.3
Income tax benefit (expense)	3.0	(9.6)	(0.6)	(16.2)
Net (loss) income	(30.2)	27.6	(67.8)	50.1
Net (income) loss attributable to noncontrolling interests	(0.3)	0.1	(0.5)	0.1
Net (loss) income attributable to Stericycle, Inc.	(30.5)	27.7	(68.3)	50.2
Mandatory convertible preferred stock dividend		(8.3)		(17.1)
Gain on repurchases of preferred stock		7.2		14.5
Net (loss) income attributable to Stericycle, Inc. common shareholders	$ (30.5)	$ 26.6	$ (68.3)	$ 47.6
(Loss) earnings per common share attributable to Stericycle, Inc. common shareholders:
Basic	$ (0.33)	$ 0.31	$ (0.75)	$ 0.56
Diluted	$ (0.33)	$ 0.31	$ (0.75)	$ 0.55
Weighted average number of common shares outstanding:
Basic	91.0	85.6	90.9	85.6
Diluted	91.0	85.8	90.9	85.8