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Reserves for Losses and Adjustment Expenses Short-duration insurance contracts - Reconciliation of Claims Development (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Liability for claims and claim adjustment expenses, net of reinsurance   $ 3,151.6   $ 4,484.0    
Reinsurance recoverable on unpaid losses   4,897.7   3,298.1    
Unallocated claims incurred   41.4   56.6    
Carbon syndicate reserves   5.2   1.0    
Other   1.6   0.2    
Liability for unpaid claims and claim adjustment expense, aggregate reconciling items   (338.4)   (170.3)    
Losses and loss adjustment expenses $ 7,740.9 7,710.9 $ 7,511.8 7,611.8 $ 7,165.3 $ 6,951.8
Property Insurance            
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Liability for claims and claim adjustment expenses, net of reinsurance   259.0   289.3    
Casualty Insurance            
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Liability for claims and claim adjustment expenses, net of reinsurance   457.3   725.6    
Marine, Aviation and Energy Insurance            
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Liability for claims and claim adjustment expenses, net of reinsurance   163.7   427.9    
Financial and Professional Insurance            
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Liability for claims and claim adjustment expenses, net of reinsurance   671.9   808.7    
Insurance lines            
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Liability for claims and claim adjustment expenses, net of reinsurance   1,551.9   2,251.5    
Reinsurance recoverable on unpaid losses   2,907.8   2,117.4    
Property Catastrophe and Other Property Reinsurance            
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Liability for claims and claim adjustment expenses, net of reinsurance   677.9   784.9    
Casualty Reinsurance            
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Liability for claims and claim adjustment expenses, net of reinsurance   571.6   975.3    
Specialty Reinsurance            
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Liability for claims and claim adjustment expenses, net of reinsurance   350.2   472.3    
Reinsurance lines            
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Liability for claims and claim adjustment expenses, net of reinsurance   1,599.7   2,232.5    
Reinsurance recoverable on unpaid losses   1,989.9   1,180.7    
Insurance lines other than short-duration            
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]            
Other reinsurance balances recoverable   (429.3)   (286.4)    
Losses and loss adjustment expenses   $ 42.7   $ 58.3