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Allowance for Credit Losses - Reinsurance Recoverables (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Credit Loss [Abstract]      
Reinsurance recoverables, net $ 3,016.9 $ 3,029.1 $ 2,966.4
Reinsurance Recoverable, Allowance for Credit Loss [Roll Forward]      
Balance, December 31, 2022 4.7 3.8  
Current period change for estimated uncollectible reinsurance 0.0 1.7  
Write-offs of uncollectible reinsurance recoverables 0.0 0.0  
Reclassified to assets held-for-sale   (0.8)  
Balance, March 31, 2023 $ 4.7 $ 4.7