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Earnings per Common Share - Textual (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Feb. 28, 2015
Jan. 31, 2015
Oct. 31, 2014
Apr. 30, 2015
Dec. 31, 2014
Apr. 23, 2015
Apr. 22, 2015
Apr. 01, 2015
Earnings per Common Share (Textual) [Abstract]                    
Cash dividends per common share, Declared $ 0.21us-gaap_CommonStockDividendsPerShareDeclared $ 0.18us-gaap_CommonStockDividendsPerShareDeclared                
Common Stock                    
Earnings per Common Share (Textual) [Abstract]                    
Cash dividends per common share, Declared     $ 0.21us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
  $ 0.21us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
         
Cash dividends per common share, Paid       $ 0.21us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
           
Dividends Payable, Current $ 19.1us-gaap_DividendsPayableCurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
          $ 18.6us-gaap_DividendsPayableCurrent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
     
Common Stock | Subsequent Event [Member]                    
Earnings per Common Share (Textual) [Abstract]                    
Cash dividends per common share, Paid           $ 0.21us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Convertible Preferred Stock, Conversion Price               $ 33.9905hls_ConvertiblePreferredStockConversionPrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Common Stock, Par or Stated Value Per Share               $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Convertible Preferred Stock, Shares Issued upon Conversion               3,271,415us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Convertible Preferred Stock [Member] | Subsequent Event [Member]                    
Earnings per Common Share (Textual) [Abstract]                    
Preferred Stock, Par or Stated Value Per Share                 $ 0.10us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Temporary Equity, Liquidation Preference Per Share                 $ 1,000us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Temporary Equity, Shares Outstanding               96,245us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_ConvertiblePreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
2.00% Convertible Senior Subordinated Notes due 2043 [Member]                    
Earnings per Common Share (Textual) [Abstract]                    
Debt Instrument, Convertible, Conversion Price $ 39.65us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= hls_A2.00ConvertibleSeniorSubordinatedNotesdue2043Member
                 
Debt Instrument, Convertible, Terms of Conversion Feature 25.2194 shares per $1,000 principal amount                  
2.00% Convertible Senior Subordinated Notes due 2043 [Member] | Subsequent Event [Member]                    
Earnings per Common Share (Textual) [Abstract]                    
Debt Instrument, Convertible, Conversion Price                   $ 38.82us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_LongtermDebtTypeAxis
= hls_A2.00ConvertibleSeniorSubordinatedNotesdue2043Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Debt Instrument, Convertible, Shares Issued Upon Conversion                   25.7582hls_DebtInstrumentConvertibleSharesIssuedUponConversion
/ us-gaap_LongtermDebtTypeAxis
= hls_A2.00ConvertibleSeniorSubordinatedNotesdue2043Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember