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Segment Reporting (Tables)
12 Months Ended
Dec. 31, 2020
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 results, ratios and reserves for each of the Company’s business segments for the twelve months ended December 31, 2020, 2019 and 2018:
 Twelve Months Ended December 31, 2020
 ReinsuranceInsuranceTotal
 ($ in millions)
Underwriting Revenues
Gross written premiums$1,660.8 $2,042.8 $3,703.6 
Net written premiums1,302.1 1,280.8 2,582.9 
Gross earned premiums1,616.4 2,027.1 3,643.5 
Net earned premiums1,292.1 1,240.5 2,532.6 
Underwriting Expenses
Losses and loss adjustment expenses958.6 882.2 1,840.8 
Amortization of deferred policy acquisition costs246.0 219.7 465.7 
General and administrative expenses110.8 197.2 308.0 
Underwriting (loss)(23.3)(58.6)(81.9)
Corporate expenses(70.2)
Non-operating expenses (32.7)
(1)
Net investment income154.6 
Realized and unrealized investment gains98.5 
Realized and unrealized investment losses(27.4)
Change in fair value of derivatives(65.1)
Interest expense on long term debt(33.9)
Net realized and unrealized foreign exchange (losses)(12.4)
Other income49.8 
(2)
Other expenses(10.8)
(Loss) before income taxes(31.5)
Income tax (expense)(8.6)
Net (loss)$(40.1)
Net reserves for loss and loss adjustment expenses$2,095.7 $1,874.4 $3,970.1 
Ratios
Loss ratio74.2 %71.1 %72.7 %
Policy acquisition expense ratio19.0 17.7 18.4 
General and administrative expense ratio8.6 15.9 16.2 
(3)
Expense ratio27.6 33.6 34.6 
Combined ratio101.8 %104.7 %107.3 %
 _______________
(1)Non-operating expenses includes $18.2 million of costs related to severance, retention awards and other costs, $12.9 million of impairment charges related to lease assets as a result of sub-leasing certain office space and $1.6 million of amortization of intangible assets and other non-operating expenses.
(2)Includes the gain on sale of our renewal rights on our surety insurance book of business to a third party, totaling $43.1 million.
(3)The general and administrative expense ratio in the total column includes corporate and non-operating expenses.
 Twelve Months Ended December 31, 2019
 ReinsuranceInsuranceTotal
 ( $ in millions)
Underwriting Revenues
Gross written premiums$1,485.5 $1,956.9 $3,442.4 
Net written premiums1,251.1 1,176.8 2,427.9 
Gross earned premiums1,494.9 1,927.5 3,422.4 
Net earned premiums1,255.2 1,038.1 2,293.3 
Underwriting Expenses
Losses and loss adjustment expenses917.9 761.8 1,679.7 
Amortization of deferred policy acquisition costs264.9 147.8 412.7 
General and administrative expenses111.7 229.8 341.5 
Underwriting (loss)(39.3)(101.3)(140.6)
Corporate expenses(54.5)
Non-operating expenses(125.6)
(1)
Net investment income197.3 
Realized and unrealized investment gains97.1 
Realized and unrealized investment losses(10.9)
Realized loss on debt extinguishment(5.5)
Change in fair value of loan notes issued by variable interest entities(3.1)
Change in fair value of derivatives(144.2)
Interest expense on long term debt(20.2)
Net realized and unrealized foreign exchange (losses)(11.8)
Other income4.9 
Other expenses(1.7)
(Loss) before income taxes(218.8)
Income tax (expense)(22.9)
Net (loss)$(241.7)
Net reserves for loss and loss adjustment expenses$2,605.9 $2,026.1 $4,632.0 
Ratios
Loss ratio73.1 %73.4 %73.2 %
Policy acquisition expense ratio21.1 14.2 18.0 
General and administrative expense ratio 8.9 22.1 22.7 
(2)
Expense ratio30.0 36.3 40.7 
Combined ratio103.1 %109.7 %113.9 %
 ________________

(1)Non-operating expenses includes $103.4 million of costs related to the Merger, severance, retention and other costs, $22.2 million of expenses related to the Company’s operating effectiveness and efficiency program, which includes $12.3 million of impairment charges related to lease assets as a result of sub-leasing certain office space.
(2)The general and administrative expense ratio in the total column includes corporate and non-operating expenses.
 Twelve Months Ended December 31, 2018
 ReinsuranceInsuranceTotal
 ($ in millions)
Underwriting Revenues
Gross written premiums$1,495.7 $1,951.2 $3,446.9 
Net written premiums1,182.9 899.1 2,082.0 
Gross earned premiums1,593.9 1,940.5 3,534.4 
Net earned premiums1,256.4 958.3 2,214.7 
Underwriting Expenses
Losses and loss adjustment expenses927.0 646.0 1,573.0 
Amortization of deferred policy acquisition costs260.9 110.7 371.6 
General and administrative expenses118.5 239.2 357.7 
Underwriting (loss)(50.0)(37.6)(87.6)
Corporate expenses(56.8)
Non-operating expenses (77.2)
(1)
Net investment income198.2 
Realized and unrealized investment gains110.0 
Realized and unrealized investment losses(174.7)
Realized (loss) on debt extinguishment(8.6)
Change in fair value of loan notes issued by variable interest entities(4.4)
Change in fair value of derivatives(31.8)
Interest expense on long term debt(25.9)
Net realized and unrealized foreign exchange (losses)(3.5)
Other income9.0 
Other expenses(2.7)
(Loss) before income taxes (156.0)
Income tax benefit10.2 
Net (loss)$(145.8)
Net reserves for loss and loss adjustment expenses$2,843.6 $2,153.0 $4,996.6 
Ratios
Loss ratio73.8 %67.4 %71.0 %
Policy acquisition expense ratio20.8 11.6 16.8 
General and administrative expense ratio 9.4 25.0 22.2 
(2)
Expense ratio30.2 36.6 39.0 
Combined ratio104.0 %104.0 %110.0 %
_______________
(1)Non-operating expenses includes $37.5 million of expenses related to Company’s operating effectiveness and efficiency program, $39.0 million of advisor fees related to the Merger and $11.3 million of retention costs, partially offset by the write back of a $14.1 million buy-out provision.
(2)The general and administrative expense ratio in the total column includes corporate and non-operating expenses.
Schedule of gross written premiums based on geographical areas
Geographical Areas. The following summary presents the Company’s gross written premiums based on the location of the insured risk for the twelve months ended December 31, 2020, 2019 and 2018.
For the Twelve Months Ended
 December 31, 2020December 31, 2019December 31, 2018
 ($ in millions)
Australia/Asia$259.7 $215.9 $175.9 
Caribbean6.0 9.3 7.7 
Europe92.5 82.8 92.6 
United Kingdom374.1 295.7 290.1 
United States & Canada (1)
2,267.5 2,003.9 1,875.9 
Worldwide excluding United States (2)
23.1 63.0 70.1 
Worldwide including United States (3)
501.2 614.9 775.8 
Others179.5 156.9 158.8 
Total
$3,703.6 $3,442.4 $3,446.9 
 ______________
(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” comprises individual policies that insure risks wherever they may be across the world but specifically excludes the United States.
(3)    “Worldwide including the United States” comprises individual policies that insure risks wherever they may be across the world but specifically includes the United States.