Business Combinations - Table 1 (Details) (USD $) In Millions, unless otherwise specified						12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2013	Apr. 30, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Noncompete Agreements [Member]	Apr. 30, 2013 Noncompete Agreements [Member]	Dec. 31, 2013 Trade Names [Member]	Apr. 30, 2013 Trade Names [Member]	Dec. 31, 2013 Certificates of need [Member]	Apr. 30, 2013 Certificates of need [Member]
Business Acquisition [Line Items]
Property and equipment, net		$ 11.3
Identifiable intangible assets							0.1		0.9		3.3
Goodwill	456.9	13.7	437.3	421.7	420.3
Total assets acquired		29.3
Total current liabilities assumed		(0.4)
Net assets acquired		$ 28.9
Useful Lives of Acquired Finite-Lived Intangible Assets [Abstract]
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life						5 years		20 years		20 years