Goodwill and Other Intangible Assets - Table 2 (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	$ 240.9	$ 208.8
Accumulated Amortization	(152.7)	(135.6)
Net	88.2	73.2
Certificates of need [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	14.7	9.9
Accumulated Amortization	(3.0)	(2.5)
Net	11.7	7.4
Licenses [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	50.5	50.6
Accumulated Amortization	(44.9)	(42.9)
Net	5.6	7.7
Noncompete Agreements [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	40.2	34.3
Accumulated Amortization	(24.8)	(20.3)
Net	15.4	14.0
Trade Names [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	17.0	16.1
Accumulated Amortization	(9.3)	(8.6)
Net	7.7	7.5
Software [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	105.3	84.7
Accumulated Amortization	(63.5)	(55.0)
Net	41.8	29.7
Market access assets [Member]
Schedule of Intangible Assets by Major Class
Gross Carrying Amount	13.2	13.2
Accumulated Amortization	(7.2)	(6.3)
Net	$ 6.0	$ 6.9