Business Combinations - Table 2 (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Feb. 29, 2016	Mar. 31, 2016	Mar. 31, 2015
Net Cash Paid For All Acquisitions During Each Period Presented
Net cash paid for acquisition		$ 0.0	$ 7.3
Inpatient Rehabilitation Hospital [Member]
Net Cash Paid For All Acquisitions During Each Period Presented
Fair value of assets acquired		5.3
Goodwill	$ 1.8	1.8
Fair value of noncontrolling interests owned by joint venture partner		(7.1)
Net cash paid for acquisition		$ 0.0