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Recent Acquisitions, Disposals & Other Transactions - Sale of Business Unit (Details)
R$ in Millions, $ in Millions
12 Months Ended
Feb. 15, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Feb. 15, 2022
BRL (R$)
Nov. 25, 2020
USD ($)
Apr. 30, 2020
USD ($)
Subsequent Event            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal group, adjustment to carrying value of acquisition cost $ 5.6          
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Trident            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash consideration received from sale           $ 38.0
Gain (loss) on disposal, pre-tax   $ 10.5 $ (31.8)      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Ariel Re            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash consideration received from sale         $ 30.0  
Gain (loss) on disposal, pre-tax     $ 9.4      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Argo Seguros Brasil S.A. | Subsequent Event            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash consideration received from sale 30.5     R$ 160    
Gain (loss) on disposal, pre-tax 6.3          
Gain (loss) on disposal, other costs $ 0.7