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Segment Information
 9 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Segment Information Segment Information
We are primarily engaged in underwriting property and casualty insurance. We have two ongoing reporting segments: U.S. Operations and International Operations. Additionally, we have a Run-off Lines segment for certain products that we no longer underwrite.
We consider many factors, including the nature of each segment’s insurance and reinsurance products, production sources, distribution strategies and the regulatory environment, in determining how to aggregate reporting segments. Transactions between segments are reported in the segment that initiated the transaction.
In evaluating the operating performance of our segments, we focus on core underwriting and investing results before the consideration of realized gains or losses from investments. Realized investment gains are reported as a component of the Corporate and Other segment, as decisions regarding the acquisition and disposal of securities reside with the corporate investment function and are not under the control of the individual business segments. Identifiable assets by segment are those assets used in the operation of each segment.
Revenue and income (loss) before income taxes for each segment were as follows:
 For the Three Months Ended
September 30,		For the Nine Months Ended
September 30,
(in millions)2021202020212020
Revenue:
Earned premiums
U.S. Operations$323.5 $298.7 $952.4 $902.8 
International Operations163.9 146.7 471.1 410.8 
Run-off Lines0.1 0.1 0.4 0.3 
Total earned premiums487.5 445.5 1,423.9 1,313.9 
Net investment income
U.S. Operations29.2 30.1 91.7 56.1 
International Operations12.3 9.9 38.2 19.0 
Run-off Lines0.9 1.5 2.8 2.8 
Corporate and Other3.7 0.5 10.5 1.1 
Total net investment income46.1 42.0 143.2 79.0 
Net realized investment gains (losses) (5.3)(5.7)32.5 (24.0)
Total revenue$528.3 $481.8 $1,599.6 $1,368.9 

For the Three Months Ended
September 30,		For the Nine Months Ended
September 30,
(in millions)2021202020212020
Income (loss) before income taxes
U.S. Operations$39.9 $20.1 $130.1 $88.2 
International Operations6.9 (14.7)14.6 (54.5)
Run-off Lines(3.6)(9.5)(4.5)(10.3)
Total segment income before taxes 43.2 (4.1)140.2 23.4 
Corporate and Other(11.0)(8.3)(30.2)(32.1)
Net realized investment and other gains (losses) (5.3)(5.7)32.5 (24.0)
Foreign currency exchange losses1.3 (8.4)(4.4)(13.6)
Total income (loss) before income taxes$28.2 $(26.5)$138.1 $(46.3)
The table below presents earned premiums by geographic location for the three and nine months ended September 30, 2021 and 2020. For this disclosure, we determine geographic location by the country of domicile of our subsidiaries that underwrite the business and not by the location of insureds or reinsureds from whom the business was generated.
For the Three Months Ended
September 30,		For the Nine Months Ended
September 30,
(in millions)2021202020212020
United States$322.7 $299.1 $949.7 $900.2 
United Kingdom129.1 90.6 344.9 252.8 
Bermuda10.3 27.3 46.1 73.8 
Malta7.7 13.0 32.7 43.3 
All other jurisdictions17.7 15.5 50.5 43.8 
Total earned premiums$487.5 $445.5 $1,423.9 $1,313.9 
The following table represents identifiable assets:
(in millions)September 30, 2021December 31, 2020
U.S. Operations$5,841.6 $6,032.2 
International Operations3,900.6 3,899.4 
Run-off Lines270.3 335.9 
Corporate and Other505.6 198.3 
Total$10,518.1 $10,465.8 
Included in total assets at September 30, 2021 and December 31, 2020 are $597.5 million and $825.9 million, respectively, in assets associated with trade capital providers.