ACQUISITIONS - Pro Forma Condensed Consolidated Statement of Income (Details) - Hospice [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AseraCare Hospice [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Net service revenue	$ 2,120.1	$ 2,077.0
Operating income	218.0	167.5
Net income attributable to Amedisys Inc.	$ 180.6	$ 112.3
Basic earnings per share	$ 5.55	$ 3.49
Diluted earnings per share	$ 5.43	$ 3.40
Compassionate Care Hospice [Member]
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Net service revenue		$ 1,971.7	$ 1,852.8
Operating income		183.8	175.7
Net income attributable to Amedisys Inc.		$ 130.5	$ 124.6
Basic earnings per share		$ 4.06	$ 3.80
Diluted earnings per share		$ 3.96	$ 3.71