CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (14.1)	$ 26.2
Other comprehensive (loss) income:
Currency translation adjustments	(8.9)	(13.1)
Total other comprehensive (loss) income	(8.9)	(13.1)
Comprehensive (loss) income	(23.0)	13.1
Less: comprehensive income attributable to noncontrolling interests	(0.1)	(0.1)
Comprehensive (loss) income attributable to Stericycle, Inc. common shareholders	$ (22.9)	$ 13.2