Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	$ 879.9	$ 837.3
Accumulated Amortization	(462.4)	(406.0)
Net	417.5	431.3
Certificates of need
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	204.5	197.3
Accumulated Amortization	(68.8)	(54.5)
Net	135.7	142.8
Licenses
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	194.5	187.9
Accumulated Amortization	(121.0)	(107.4)
Net	73.5	80.5
Noncompete agreements
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	78.5	75.2
Accumulated Amortization	(69.0)	(65.8)
Net	9.5	9.4
Trade name - Encompass
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	135.2	135.2
Accumulated Amortization	0.0	0.0
Net	135.2	135.2
Trade names
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	45.0	44.3
Accumulated Amortization	(27.0)	(25.5)
Net	18.0	18.8
Internal-use Software
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	209.0	184.2
Accumulated Amortization	(164.9)	(141.4)
Net	44.1	42.8
Market access assets
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	13.2	13.2
Accumulated Amortization	(11.7)	(11.4)
Net	$ 1.5	$ 1.8