CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (509.7)	$ (414.6)	$ (192.1)
Other comprehensive loss:
Net unrealized loss on marketable debt securities, net of tax	(0.8)	(1.4)	0.0
Comprehensive loss	(510.5)	(416.0)	(192.1)
Less: Comprehensive loss attributable to non-controlling interests	(0.5)	(5.2)	(4.1)
Comprehensive loss attributable to Oak Street Health, Inc.	$ (510.0)	$ (410.8)	$ (188.0)