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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Company's Restricted Assets
The following table details the forms and value of Company’s material restricted assets as at December 31, 2023 and 2022:
As at December 31, 2023At December 31, 2022
 ($ in millions, except percentages)
Regulatory trusts and deposits:
Affiliated transactions$660.8 $707.1 
Third party2,714.4 2,817.7 
Letters of credit / guarantees (1)
172.0 471.3 
Total restricted assets (excluding illiquid assets)3,547.2 3,996.1 
Other investments — illiquid assets209.3 221.3 
Total restricted assets and illiquid assets$3,756.5 $4,217.4 
Total as percent of cash and invested assets (2)
50.2 %59.4 %