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Segment Reporting (Tables)
12 Months Ended
Dec. 31, 2023
Segment Reporting [Abstract]  
Summary of gross and net written and earned premiums, underwriting results, ratios and reserves for each of Company's business segments
The following tables provide a summary of gross and net written and earned premiums, underwriting income or loss, ratios and reserves for each of the Company’s business segments for the twelve months ended December 31, 2023, 2022 and 2021:
 Twelve Months Ended December 31, 2023
 ReinsuranceInsuranceTotal
 ($ in millions)
Underwriting Revenues
Gross written premiums$1,521.0 $2,446.6 $3,967.6 
Net written premiums1,098.0 1,483.9 2,581.9 
Gross earned premiums1,562.0 2,444.8 4,006.8 
Net earned premiums1,154.5 1,460.0 2,614.5 
Underwriting Expenses
Losses and loss adjustment expenses611.1 941.9 1,553.0 
Acquisition costs208.6 171.6 380.2 
General and administrative expenses120.6 233.9 354.5 
Underwriting income214.2 112.6 326.8 
Corporate and other expenses (1)
(114.0)
Non-operating expenses (2)
(35.1)
Net investment income275.7 
Realized and unrealized investment gains75.9 
Realized and unrealized investment losses(61.4)
Change in fair value of derivatives26.1 
Interest expense(55.2)
Net realized and unrealized foreign exchange (losses)
(36.2)
Income before income taxes
402.6 
Income tax benefit
132.1 
Net income$534.7 
Net reserves for loss and loss adjustment expenses$1,373.1 $1,859.7 $3,232.8 
Ratios
Loss ratio52.9 %64.5 %59.4 %
Acquisition cost ratio18.1 11.8 14.5 
General and administrative expense ratio10.4 16.0 13.6 
Expense ratio28.5 27.8 28.1 
Combined ratio81.4 %92.3 %87.5 %
 _______________
(1)Corporate and other expenses includes other income/(expenses), which were previously presented separately.
(2)Non-operating expenses in the twelve months ended December 31, 2023 includes expenses in relation to consulting fees, non-recurring transformation program costs, and other non-recurring costs.
 Twelve Months Ended December 31, 2022
 ReinsuranceInsuranceTotal
 ( $ in millions)
Underwriting Revenues
Gross written premiums$1,807.0 $2,531.7 $4,338.7 
Net written premiums1,426.4 1,469.6 2,896.0 
Gross earned premiums1,617.2 2,370.8 3,988.0 
Net earned premiums1,251.8 1,436.9 2,688.7 
Underwriting Expenses
Losses and loss adjustment expenses770.3 909.7 1,680.0 
Acquisition costs252.4 179.4 431.8 
General and administrative expenses142.5 244.0 386.5 
Underwriting income
86.6 103.8 190.4 
Corporate expenses(71.7)
Non-operating expenses (1)
(36.0)
Net investment income188.1 
Realized and unrealized investment gains5.0 
Realized and unrealized investment losses(182.6)
Change in fair value of derivatives(80.5)
Interest expense(43.7)
Net realized and unrealized foreign exchange gains15.9 
Other income8.2 
Other expenses(20.1)
(Loss) before income taxes
(27.0)
Income tax benefit
78.1 
Net income$51.1 
Net reserves for loss and loss adjustment expenses$1,360.7 $1,452.5 $2,813.2 
Ratios
Loss ratio61.5 %63.3 %62.5 %
Acquisition cost ratio20.2 12.5 16.1 
General and administrative expense ratio 11.4 17.0 14.4 
Expense ratio31.6 29.5 30.5 
Combined ratio93.1 %92.8 %93.0 %
 ________________

(1)Non-operating expenses in the twelve months ended December 31, 2022 includes expenses in relation to consulting fees, non-recurring transformation activities, and other non-recurring costs.
 Twelve Months Ended December 31, 2021
 ReinsuranceInsuranceTotal
 ($ in millions)
Underwriting Revenues
Gross written premiums$1,597.0 $2,341.4 $3,938.4 
Net written premiums1,199.0 1,388.7 2,587.7 
Gross earned premiums1,479.2 2,139.1 3,618.3 
Net earned premiums1,118.8 1,291.7 2,410.5 
Underwriting Expenses
Losses and loss adjustment expenses705.2 988.1 1,693.3 
Acquisition costs221.6 192.5 414.1 
General and administrative expenses121.3 211.8 333.1 
Underwriting income/(loss)
70.7 (100.7)(30.0)
Corporate expenses(64.3)
Non-operating expenses (1)
(20.6)
Net investment income147.5 
Realized and unrealized investment gains56.2 
Realized and unrealized investment losses(47.4)
Change in fair value of derivatives(35.9)
Interest expense(14.3)
Net realized and unrealized foreign exchange gains
40.0 
Other income14.7 
Other expenses(10.8)
Income before income taxes
35.1 
Income tax (expense)(5.3)
Net income
$29.8 
Net reserves for loss and loss adjustment expenses$2,148.4 $2,165.3 $4,313.7 
Ratios
Loss ratio63.0 %76.5 %70.2 %
Acquisition cost ratio19.8 14.9 17.2 
General and administrative expense ratio 10.8 16.4 13.8 
Expense ratio30.6 31.3 31.0 
Combined ratio93.6 %107.8 %101.2 %
_______________
(1)Non-operating expenses in the twelve months ended December 31, 2021 includes expenses in relation to consulting fees, non-recurring transformation activities, and other non-recurring costs.
Schedule of gross written premiums based on geographical areas
Geographical Areas. The following summary presents the Company’s gross written premiums based on the location of the insured risk for the twelve months ended December 31, 2023, 2022 and 2021.
For the Twelve Months Ended
 December 31, 2023December 31, 2022December 31, 2021
 ($ in millions)
Australia/Asia$177.8 $257.5 $275.8 
Europe179.4 194.5 140.6 
United Kingdom & Ireland
532.5 485.8 393.2 
United States & Canada (1)
2,472.0 2,715.7 2,301.8 
Worldwide excluding United States (2)
28.8 24.2 31.5 
Worldwide including United States (3)
417.2 541.7 592.2 
Other (4)
159.9 119.3 203.3 
Total
$3,967.6 $4,338.7 $3,938.4 
 ______________
(1)    “United States and Canada” comprises individual policies that insure risks specifically in the United States and/or Canada, but not elsewhere.
(2)    “Worldwide excluding the United States” consists of individual policies that insure global risks with the specific exclusion of the United States.
(3)    “Worldwide including the United States” consists of individual policies that insure global risks with the specific inclusion of the United States.
(4)    “Other” comprises individual policies that insure risk in other countries including, but not limited to, the Caribbean, South America and Middle East.