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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2023 and December 31, 2022:
As at June 30, 2023As at December 31, 2022
 ($ in millions, except percentages)
Regulatory trusts and deposits:
Affiliated transactions$617.0 $707.1 
Third party2,773.8 2,817.7 
Letters of credit / guarantees(1)
266.5 471.3 
Total restricted assets (excluding illiquid assets)3,657.3 3,996.1 
Other investments — illiquid assets213.4 221.3 
Total restricted assets and illiquid assets$3,870.7 $4,217.4 
Total as percent of cash and investable assets (2)
52.6 %59.4 %
 
(1)As at June 30, 2023, the Company had pledged funds as collateral for the secured letters of credit of $266.5 million (December 31, 2022 — $471.3 million).
(2)Investable assets comprise total investments, cash and cash equivalents, accrued interest, receivables for securities sold and payables for securities purchased.