CONDENSED CONSOLIDATED STATEMENTS OF (LOSS) INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 830.1	$ 895.0
Cost of revenues	533.0	536.5
Gross profit	297.1	358.5
Selling, general and administrative expenses	280.4	304.4
Goodwill impairment	20.9
(Loss) income from operations	(4.2)	54.1
Interest expense, net	(27.6)	(25.0)
Other expense, net	(2.2)
(Loss) income before income taxes	(34.0)	29.1
Income tax expense	(3.6)	(6.6)
Net (loss) income	(37.6)	22.5
Net income attributable to noncontrolling interests	(0.2)
Net (loss) income attributable to Stericycle, Inc.	(37.8)	22.5
Mandatory convertible preferred stock dividend		(8.8)
Gain on repurchases of preferred stock		7.3
Net (loss) income attributable to Stericycle, Inc. common shareholders	$ (37.8)	$ 21.0
(Loss) earnings per common share attributable to Stericycle, Inc. common shareholders:
Basic	$ (0.42)	$ 0.25
Diluted	$ (0.42)	$ 0.25
Weighted average number of common shares outstanding:
Basic	90.7	85.5
Diluted	90.7	85.8