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Property and Casualty Insurance Reserves - Allowance for Credit Losses from Policyholders (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Premium Receivable, Allowance for Credit Loss [Roll Forward]        
Premium Receivable, Allowance for Credit Loss, Beginning Balance $ 13.1 $ 13.6    
Premium Receivable, Allowance for Credit Loss, Ending Balance 11.3 13.0    
Receivables from Policyholders (Allowance for Credit Losses: 2023 - $11.3; 2022 - $13.1) 1,344.0 1,404.5 $ 1,286.6 $ 1,418.7
Receivables from policyholders, net of allowance for expected credit losses 1,344.0   1,286.6  
Premium receivables, allowance for credit losses 11.3 13.0 $ 13.1 $ 13.6
Provision for Expected Credit Losses 11.0 11.3    
Premium Receivable, Allowance for Credit Loss, Writeoff $ 12.8 $ 11.9