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Statutory Requirements and Dividends Restrictions (Tables)
 12 Months Ended
Dec. 31, 2023
Disclosure Statutory Requirements And Dividends Restrictions Summary Of Statutory Requirements And Dividends Restrictions [Abstract]  
Summary of Statutory Capital and Surplus Requirements
As at December 31, 2023
U.S.BermudaU.K. 
($ in millions)
Required statutory capital and surplus$488.9 $601.1 $257.2 
Actual statutory capital and surplus$1,063.1 $1,685.2 $734.7 
As at December 31, 2022
U.S.BermudaU.K. 
($ in millions)
Required statutory capital and surplus$513.9 $536.7 $771.8 
Actual statutory capital and surplus$838.6 $1,426.6 $802.5