Segment Reporting Segment Reporting - Table 1 (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net operating revenues	$ 909.8	$ 740.6
Provision for Doubtful Accounts	(16.5)	(11.6)
Net operating revenues less provision for doubtful accounts	893.3	729.0
Costs and Expenses [Abstract]
Salaries and benefits	486.1	385.1
Other operating expenses	119.2	103.2
Supplies	35.0	31.4
Occupancy costs	18.0	12.1
Total segment level operating expenses	732.8	608.5
Other income	(0.6)	(0.5)
Equity in net income of nonconsolidated affiliates	(2.4)	(1.6)
Noncontrolling interest	(18.7)	(16.5)
Inpatient Rehabilitation Hospital [Member]
Segment Reporting Information [Line Items]
Net operating revenues	749.2	630.3
Provision for Doubtful Accounts	(15.6)	(11.0)
Net operating revenues less provision for doubtful accounts	733.6	619.3
Costs and Expenses [Abstract]
Salaries and benefits	369.9	306.4
Other operating expenses	104.8	95.2
Supplies	32.4	29.8
Occupancy costs	15.6	10.4
Total segment level operating expenses	522.7	441.8
Other income	(0.6)	(0.5)
Equity in net income of nonconsolidated affiliates	(2.2)	(1.6)
Noncontrolling interest	16.8	15.2
Segment Adjusted EBITDA	196.9	164.4
Capital Expenditures	38.7	26.3
Home Health and Hospice [Member]
Segment Reporting Information [Line Items]
Net operating revenues	160.6	110.3
Provision for Doubtful Accounts	(0.9)	(0.6)
Net operating revenues less provision for doubtful accounts	159.7	109.7
Costs and Expenses [Abstract]
Cost of services sold (excluding depreciation and amortization)	78.4	53.4
Support and overhead costs	57.0	38.1
Total segment level operating expenses	135.4	91.5
Other income	0.0	0.0
Equity in net income of nonconsolidated affiliates	(0.2)	0.0
Noncontrolling interest	1.9	1.3
Segment Adjusted EBITDA	22.6	16.9
Capital Expenditures	$ 0.4	$ 0.3