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Business and Significant Accounting Policies - Additional Information (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations
R$ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Feb. 02, 2023
USD ($)
Feb. 15, 2022
USD ($)
Mar. 31, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2022
BRL (R$)
Feb. 15, 2022
BRL (R$)
Argo Underwriting Agency Limited                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Cash consideration received from sale $ 155.6   $ 125.0          
Impairment of goodwill and intangibles       $ 28.5        
Disposal group, intangible assets       17.3        
Impairment of goodwill and intangible assets       11.2        
Proceeds from sale of Trident assets 125.0              
Consideration placed in escrow $ 30.6              
Consideration placed in escrow, released     $ 4.8          
Consideration placed in escrow, term 2 years              
Loss on disposal $ 20.3              
Argo Seguros Brasil S.A.                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Cash consideration received from sale   $ 30.5   $ 26.9     R$ 140 R$ 160
Loss on disposal   $ 28.5     $ 33.8 $ 6.3    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]     Realized Investment Gains (Losses)