Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net loss attributable to Surgery Partners, Inc.	$ (61.6)	$ (15.7)	$ (121.6)	$ (55.6)
Less: Amounts attributable to participating securities	(10.0)	(9.1)	(29.2)	(26.4)
Net loss attributable to common stockholders	$ (71.6)	$ (24.8)	$ (150.8)	$ (82.0)
Denominator:
Weighted average shares outstanding- basic and diluted (shares)	48,883	48,310	48,736	48,265
Loss per share:
Basic and diluted (in USD per share)	$ (1.46)	$ (0.51)	$ (3.09)	$ (1.70)
Stock options
Loss per share:
Dilutive securities outstanding not included in the computation of loss per share as their effect is antidilutive (shares)	810	0	285	0
Restricted shares
Loss per share:
Dilutive securities outstanding not included in the computation of loss per share as their effect is antidilutive (shares)	986	10	848	24