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Summary of Significant Accounting Policies - Textual (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
segment
state
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]          
Number of states in which entity operates | state 37        
Number of reportable segments | segment 2        
Collection success rate of denied payments (percent) 70.00%        
Minimum accrual of loss contingency needed to accrue for related legal fees $ 5.0        
Advertising expense 6.1 $ 6.7 $ 6.3    
Fair value of the Redeemable noncontrolling interests 400.0        
Total assets [1] 6,080.7 5,175.0      
Total liabilities 4,148.0 3,356.3      
Capital in excess of par value $ 1,693.1 1,557.0 1,395.4   $ 910.6
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | RAC Audits          
Finite-Lived Intangible Assets [Line Items]          
Percentage of Medicare patient discharges (percent) 1.00%        
Accounting Standards Update 2016-02          
Finite-Lived Intangible Assets [Line Items]          
Total assets       $ 349.0  
Total liabilities       $ 347.0  
Additional Paid-in Capital          
Finite-Lived Intangible Assets [Line Items]          
Capital in excess of par value $ 2,369.9 $ 2,588.7 $ 2,747.4   $ 2,781.0
Additional Paid-in Capital | Accounting Standards Update 2016-02          
Finite-Lived Intangible Assets [Line Items]          
Capital in excess of par value $ 2.0        
[1]
Our consolidated assets as of December 31, 2019 and December 31, 2018 include total assets of variable interest entities of $215.0 million and $197.5 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of December 31, 2019 and December 31, 2018 include total liabilities of the variable interest entities of $41.1 million and $50.8 million, respectively. See Note 3, Variable Interest Entities.