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Business and Significant Accounting Policies - Sale of Business Unit (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations
€ in Millions, R$ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jun. 22, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 22, 2022
EUR (€)
Jun. 22, 2022
USD ($)
Feb. 15, 2022
USD ($)
Feb. 15, 2022
BRL (R$)
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 R$ 160
Loss on disposal   $ 28.5 $ 6.3        
Losses from the realization of historical foreign currency translation losses   $ 27.3          
ArgoGlobal Holdings Ltd.              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Cash consideration received from sale       € 4.9 $ 5.2    
Loss on disposal $ 21.3            
Losses from the realization of historical foreign currency translation losses $ 4.5