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Segment Reporting Segment Reporting - Table 2 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets $ 3,577.9us-gaap_Assets $ 3,408.8us-gaap_Assets
Investments in and advances to nonconsolidated affiliates 9.1us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures 9.4us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Inpatient Rehabilitation Hospital [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 2,762.5us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hls_InpatientRehabilitationHospitalMember		 2,596.8us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= hls_InpatientRehabilitationHospitalMember
Investments in and advances to nonconsolidated affiliates 9.1us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= hls_InpatientRehabilitationHospitalMember		 9.4us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= hls_InpatientRehabilitationHospitalMember
Home Health and Hospice [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets 879.7us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sic_Z8082		 876.3us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= sic_Z8082
Investments in and advances to nonconsolidated affiliates $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= sic_Z8082		 $ 0us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= sic_Z8082