CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 10.5	$ 29.3	$ (3.6)	$ 55.5
Other comprehensive (loss) income:
Currency translation adjustments	(46.0)	6.7	(54.9)	(6.4)
Total other comprehensive (loss) income	(46.0)	6.7	(54.9)	(6.4)
Comprehensive (loss) income	(35.5)	36.0	(58.5)	49.1
Less: comprehensive loss (income) attributable to noncontrolling interests	(0.1)	0.1	(0.3)	0.0
Comprehensive (loss) income attributable to Stericycle, Inc. common shareholders	$ (35.4)	$ 35.9	$ (58.2)	$ 49.1