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Commitments and Contingencies - Letters of Credit (Details) - Standby Letters of Credit - Line of Credit - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Line of Credit Facility [Line Items]    
Commitment $ 475.0 $ 550.0
In Use 238.1 338.6
Letters of credit outstanding, amount $ 162.3 173.0
Minimum    
Line of Credit Facility [Line Items]    
Debt instrument, term 1 year  
Maximum    
Line of Credit Facility [Line Items]    
Debt instrument, term 2 years  
Lloyds Bank plc    
Line of Credit Facility [Line Items]    
Commitment $ 125.0 200.0
In Use 53.8 133.8
Letters of credit outstanding, amount 43.1 44.2
Citibank N.A. London branch    
Line of Credit Facility [Line Items]    
Commitment 70.0 70.0
In Use 44.0 52.3
Letters of credit outstanding, amount 46.4 55.2
Barclays Bank plc    
Line of Credit Facility [Line Items]    
Commitment 140.0 140.0
In Use 82.3 84.3
Letters of credit outstanding, amount 41.4 37.7
Bank of Montreal    
Line of Credit Facility [Line Items]    
Commitment 140.0 140.0
In Use 58.0 68.2
Letters of credit outstanding, amount 31.4 35.9
Unsecured | Lloyds Bank plc    
Line of Credit Facility [Line Items]    
Commitment 25.0 25.0
In Use 19.8 20.6
Unsecured | Barclays Bank plc    
Line of Credit Facility [Line Items]    
Commitment 60.0 60.0
In Use 51.3 53.3
Unsecured | Bank of Montreal    
Line of Credit Facility [Line Items]    
Commitment 40.0 40.0
In Use 32.0 36.1
Secured | Lloyds Bank plc    
Line of Credit Facility [Line Items]    
Commitment 100.0 100.0
In Use 34.0 38.2
Secured | Citibank N.A. London branch    
Line of Credit Facility [Line Items]    
Commitment 70.0 70.0
In Use 44.0 52.3
Secured | Barclays Bank plc    
Line of Credit Facility [Line Items]    
Commitment 80.0 80.0
In Use 31.0 31.0
Secured | Bank of Montreal    
Line of Credit Facility [Line Items]    
Commitment 100.0 100.0
In Use 26.0 32.1
Ancillary own funds | Lloyds Bank plc    
Line of Credit Facility [Line Items]    
Commitment   75.0
In Use   $ 75.0
Ancillary own funds | Barclays Bank plc    
Line of Credit Facility [Line Items]    
Commitment 80.0  
Ancillary own funds | Bank of Montreal    
Line of Credit Facility [Line Items]    
Commitment 60.0  
Uncommitted Tranche | Lloyds Bank plc    
Line of Credit Facility [Line Items]    
Commitment 50.0  
Uncommitted Tranche | Citibank N.A. London branch    
Line of Credit Facility [Line Items]    
Commitment $ 200.0