XML 235 R37.htm IDEA: XBRL DOCUMENT v3.22.2.2
Business and Significant Accounting Policies - Additional Information (Details)
€ in Millions, R$ in Millions, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 22, 2022
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Sep. 08, 2022
USD ($)
Aug. 08, 2022
USD ($)
Jun. 22, 2022
EUR (€)
Feb. 15, 2022
USD ($)
Feb. 15, 2022
BRL (R$)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Impairment of goodwill and intangibles     $ 28.5   $ 0.0 $ 28.5 $ 0.0            
Impairment of goodwill and intangible assets     $ 28.5   $ 0.0 28.5 $ 0.0            
Portfolio transfer reserves cover                   $ 746.0      
Additional cover in excess of threshold                   275.0      
Additional cover threshold                   821.0      
Policy limit                   1,096.0      
Recognized loss           37.7              
Recognized loss related to impaired assets           34.2              
Minimum                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Loss corridor retained                   75.0      
Maximum                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Loss corridor retained                   $ 821.0      
Forecast                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Estimated after-tax expense   $ 100.0                      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Argo Underwriting Agency Limited                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Cash consideration received from sale                 $ 125.0        
Impairment of goodwill and intangibles           28.5              
Disposal group, intangible assets           17.3              
Impairment of goodwill and intangible assets           $ 11.2              
Disposal Group, Disposed of by Sale, Not Discontinued Operations | ArgoGlobal Holdings Ltd.                          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                          
Cash consideration received from sale $ 5.2                   € 4.9    
Loss on disposal 21.3                        
Losses from the realization of historical foreign currency translation losses $ 4.5                        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 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                       $ 26.9 R$ 140
Loss on disposal       $ 33.8       $ 6.3          
Losses from the realization of historical foreign currency translation losses       $ 27.3