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Basis of Presentation (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Number of reportable segments | segment     1  
Net income (loss) from discontinued operations $ (0.1) $ 0.5 $ 10.5 $ 1.5
Legal Fees | Immediate Family Member of Management or Principal Owner        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Expenses from transaction with related party     3.1  
Discontinued Operations - Disposed of by Sale | NATG        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net income (loss) from discontinued operations $ 0.1 $ 0.5 10.5 1.5
Contingent fees     3.0  
Restitution receipts     $ 15.0 $ 1.9