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Acquisition of Business - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Jun. 30, 2020
Jun. 10, 2019
Atlas Financial Holdings - Paratransit Business      
Business Acquisition [Line Items]      
Gross written premiums eligible for renewal $ 110    
Business acquisition, price as a percent of gross written premiums     15.00%
Warrant term to acquire shares     5 years
Number of shares able to be acquired with the warrant     2.4
Business acquisition, percentage of entity acquired by warrants     19.90%
Neon Capital Limited | Neon Capital Limited Executives      
Business Acquisition [Line Items]      
Percentage of indirect noncontrolling interest acquired   100.00%  
Equity securities | Public company warrants | Atlas Financial Holdings - Paratransit Business      
Business Acquisition [Line Items]      
Fair value of warrant on date received     $ 1