Segment Reporting Segment Reporting - Table 4 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets for reportable segments	$ 4,606.1	$ 3,388.3
Reclassification of noncurrent deferred income tax liabilities to net noncurrent deferred income tax assets	(71.3)	(64.3)
Total assets	4,606.1	3,388.3
Inpatient Rehabilitation Hospital and Home Health and Hospice [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets for reportable segments	4,677.4	3,452.6
Total assets	$ 4,677.4	$ 3,452.6