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Recent Acquisitions, Disposals & Other Transactions - Sale of Argo Underwriting Agency Limited (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 02, 2023
Oct. 01, 2022
Sep. 08, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Impairment of goodwill and intangibles   $ 28.5   $ 28.5 $ 43.2 $ 0.0
Impairment of indefinite lived intangible assets   17.3   17.3    
Impairment of goodwill   $ 11.2   11.2    
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      
Impairment of indefinite lived intangible assets     17.3      
Impairment of goodwill     $ 11.2      
Pretax net income (loss)       $ 66.8 $ 22.4 $ (59.9)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Argo Underwriting Agency Limited | Subsequent Event            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cash consideration received from sale $ 155.6          
Consideration placed in escrow $ 30.6          
Period for which consideration can be released to Seller 2 years          
Proceeds from sale of business unit $ 125.0