Segment Reporting Segment Reporting - Table 5 (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	$ 909.8	$ 740.6
Inpatient Rehabilitation Hospital [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	749.2	630.3
Inpatient [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	719.4	606.6
Outpatient and other [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	29.8	23.7
Home Health and Hospice [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	160.6	110.3
Home health [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	150.9	103.9
Hospice [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net operating revenues	$ 9.7	$ 6.4