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Commitments and Contingencies (Contingencies Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Nov. 09, 2016
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
HMA Legal Matters and Related CVR Agreement [Member]        
Loss Contingencies [Line Items]        
Payments for legal settlements   $ 266.0    
Business combination contingent consideration arrangements, contingent value right, amount per share   $ 1.00 $ 1.00  
Pending Litigation [Member] | Legal Matters Where Negative Outcome is Known or Probable [Member]        
Loss Contingencies [Line Items]        
Legal Fees     $ 2.0 $ 2.0
U.S. ex re. Baker vs. Community Health Systems, Inc. [Member]        
Loss Contingencies [Line Items]        
Judgment awarded $ 1.9