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Contingencies and Other Commitments (Details) - Pending Litigation [Member]
$ in Millions
 3 Months Ended 12 Months Ended
May 18, 2016
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2016
USD ($)
Feb. 28, 2015
patient
Apr. 24, 2014
facilities
Aug. 12, 2013
facilities
Mar. 04, 2013
patient
facilities
Honts lawsuit [Member]              
Loss Contingencies [Line Items]              
Number of hospitals involved in lawsuit | facilities           1  
Punitive damages awarded in favor of plaintiff $ 20.0            
Other operating expenses     $ 5.7        
Loss contingency accrual   $ 20.1          
Loss contingency receivable accrued   15.5          
Portion of liability that would be covered through captive insurance subsidiary   $ 6.0          
HHS-OIG Investigation [Member]              
Loss Contingencies [Line Items]              
Number of hospitals that received subpoenas | facilities         7   4
Number of patient medical records requested for each hospital in subpoenas | patient             100
Number of hospitals that received supplemental subpoenas | facilities         2    
Number of additional patient medical records requested | patient       70      
Compliance threshold under Health Care Act (percent)   60.00%