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Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 18, 2020
Jun. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Schedule of Premium Revenue by Health Plan Type [Line Items]          
Maturity period     10 years    
Average maturity period     10 years    
Interest receivable   $ 10.0 $ 10.0   $ 12.0
Risk adjustment payable   529.0 529.0   (368.0)
Risk adjustment receivable   72.0 72.0   63.0
Risk adjustment, net payable   457.0 457.0   $ 305.0
Risk adjustment, net payable, current year   (160.0) (160.0)    
Risk adjustment, net payable, prior year   297.0 297.0    
HIF liabilities   277.0 277.0 $ 271.0  
Increase in HIF liabilities     $ 6.0    
Maine Community Health Options v. United States          
Schedule of Premium Revenue by Health Plan Type [Line Items]          
Summary judgement $ 128.1        
COVID-19          
Schedule of Premium Revenue by Health Plan Type [Line Items]          
Reduction in premiums   $ 75.0