Goodwill and Other Intangible Assets - Table 2 (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	$ 627.8	$ 478.5
Accumulated Amortization	(208.4)	(172.4)
Net	419.4	306.1
Certificate of Need [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	93.9	27.9
Accumulated Amortization	(6.9)	(4.0)
Net	87.0	23.9
Licenses [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	138.9	110.8
Accumulated Amortization	(53.7)	(46.3)
Net	85.2	64.5
Noncompete Agreements [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	58.0	46.2
Accumulated Amortization	(37.0)	(29.4)
Net	21.0	16.8
Trade Name - Encompass [Member]
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 - All other [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	32.9	19.9
Accumulated Amortization	(11.5)	(10.1)
Net	21.4	9.8
Software [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	155.7	125.3
Accumulated Amortization	(90.5)	(74.5)
Net	65.2	50.8
Market access assets [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	13.2	13.2
Accumulated Amortization	(8.8)	(8.1)
Net	$ 4.4	$ 5.1