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Segment Reporting | 3 Months Ended
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Mar. 31, 2018
Segment Reporting [Abstract] |
Segment Reporting | Segment Reporting The Company has two reporting business segments: Insurance and Reinsurance. The Company has determined its reportable segments, Aspen Insurance and Aspen Reinsurance, by taking into account the manner in which management makes operating decisions and assesses operating performance. Profit or loss for each of the Company’s business segments is measured by underwriting profit or loss. Underwriting profit is the excess of net earned premiums over the sum of losses and loss expenses, amortization of deferred policy acquisition costs and general and administrative expenses. Underwriting profit or loss provides a basis for management to evaluate the business segment’s underwriting performance. Reinsurance Segment. The reinsurance segment consists of property catastrophe reinsurance, other property reinsurance, casualty reinsurance and specialty insurance and reinsurance. ACM forms part of our property catastrophe reinsurance line of business as it focuses primarily on property catastrophe business through the use of alternative capital. For a more detailed description of this business segment, see Part I, Item 1, “Business — Business Segments — Reinsurance” in the Company’s 2017 Annual Report on Form 10-K filed with the SEC. Insurance Segment. The insurance segment consists of property and casualty insurance, marine, aviation and energy insurance and financial and professional lines insurance. For a more detailed description of this business segment, see Part I, Item 1 “Business — Business Segments — Insurance” in the Company’s 2017 Annual Report on Form 10-K filed with the SEC. Non-underwriting Disclosures. The Company has provided additional disclosures for corporate and other (non-operating) income and expenses. Corporate and other income and expenses include net investment income, net realized and unrealized investment gains or losses, expenses associated with managing the Group, certain strategic and non-recurring costs, changes in fair value of derivatives and changes in fair value of the loan notes issued by variable interest entities, interest expenses, net realized and unrealized foreign exchange gains or losses, and income taxes, none of which are allocated to the business segments. Corporate expenses are not allocated to the Company’s business segments as they typically do not fluctuate with the levels of premiums written and are not directly related to the Company’s business segment operations. The Company does not allocate its assets by business segment as it evaluates underwriting results of each business segment separately from the results of the Company’s investment portfolio. 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 three months ended March 31, 2018 and 2017:
| Three Months Ended March 31, 2018 |
| Reinsurance |  | Insurance |  | Total |
| ($ in millions) |
Underwriting Revenues |  |  |  |  |  |
Gross written premiums | $ | 623.5 |  |  | $ | 493.3 |  |  | $ | 1,116.8 |  |
Net written premiums | 425.0 |  |  | 210.5 |  |  | 635.5 |  |
Gross earned premiums | 375.0 |  |  | 467.6 |  |  | 842.6 |  |
Net earned premiums | 282.5 |  |  | 251.0 |  |  | 533.5 |  |
Underwriting Expenses |  |  |  |  |  |
Losses and loss adjustment expenses | 166.9 |  |  | 143.3 |  |  | 310.2 |  |
Amortization of deferred policy acquisition costs | 55.9 |  |  | 34.9 |  |  | 90.8 |  |
General and administrative expenses | 31.6 |  |  | 63.6 |  |  | 95.2 |  |
Underwriting income | $ | 28.1 |  |  | $ | 9.2 |  |  | 37.3 |  |
Corporate expenses |  |  |  |  | (13.7 | ) |
Non-operating expenses (1) |  |  |  |  | (12.1 | ) |
Net investment income |  |  |  |  | 47.3 |  |
Realized and unrealized investment gains |  |  |  |  | 100.6 |  |
Realized and unrealized investment losses |  |  |  |  | (138.3 | ) |
Change in fair value of loan notes issued by variable interest entities |  |  |  |  | 1.0 |  |
Change in fair value of derivatives |  |  |  |  | 23.5 |  |
Interest expense on long term debt |  |  |  |  | (7.4 | ) |
Net realized and unrealized foreign exchange (losses) |  |  |  |  | (4.7 | ) |
Other income |  |  |  |  | 2.1 |  |
Other expenses |  |  |  |  | (1.2 | ) |
Income before tax |  |  |  |  | $ | 34.4 |  |
Net reserves for loss and loss adjustment expenses | $ | 2,823.6 |  |  | $ | 2,244.5 |  |  | $ | 5,068.1 |  |
Ratios |  |  |  |  |  |
Loss ratio | 59.1 | % |  | 57.1 | % |  | 58.1 | % |
Policy acquisition expense ratio | 19.8 |  |  | 13.9 |  |  | 17.0 |  |
General and administrative expense ratio | 11.2 |  |  | 25.3 |  |  | 22.7 |  | (2)
Expense ratio | 31.0 |  |  | 39.2 |  |  | 39.7 |  |
Combined ratio | 90.1 | % |  | 96.3 | % |  | 97.8 | % |
(1) | Non-operating expenses includes $11.8 million of expenses related to the Company’s Effectiveness and Efficiency Program.
(2) | The general and administrative expense ratio in the “Total” column includes corporate and non-operating expenses.
| Three Months Ended March 31, 2017 |
| Reinsurance |  | Insurance |  | Total |
| ( $ in millions) |
Underwriting Revenues |  |  |  |  |  |
Gross written premiums | $ | 565.3 |  |  | $ | 432.7 |  |  | $ | 998.0 |  |
Net written premiums | 448.2 |  |  | 238.0 |  |  | 686.2 |  |
Gross earned premiums | 327.6 |  |  | 423.7 |  |  | 751.3 |  |
Net earned premiums | 277.5 |  |  | 303.6 |  |  | 581.1 |  |
Underwriting Expenses |  |  |  |  |  |
Losses and loss adjustment expenses | 143.1 |  |  | 185.1 |  |  | 328.2 |  |
Amortization of deferred policy acquisition costs | 59.5 |  |  | 54.2 |  |  | 113.7 |  |
General and administrative expenses | 43.9 |  |  | 61.8 |  |  | 105.7 |  |
Underwriting income | $ | 31.0 |  |  | $ | 2.5 |  |  | 33.5 |  |
Corporate expenses |  |  |  |  | (13.4 | ) |
Non-operating expenses |  |  |  |  | (2.2 | ) |
Net investment income |  |  |  |  | 47.7 |  |
Realized and unrealized investment gains |  |  |  |  | 51.2 |  |
Realized and unrealized investment losses |  |  |  |  | (5.0 | ) |
Change in fair value of loan notes issued by variable interest entities |  |  |  |  | (2.9 | ) |
Change in fair value of derivatives |  |  |  |  | 3.1 |  |
Interest expense on long term debt |  |  |  |  | (7.4 | ) |
Net realized and unrealized foreign exchange gains |  |  |  |  | (8.9 | ) |
Other income |  |  |  |  | 3.6 |  |
Income before tax |  |  |  |  | $ | 99.3 |  |
Net reserves for loss and loss adjustment expenses | $ | 2,445.4 |  |  | $ | 2,284.7 |  |  | $ | 4,730.1 |  |
Ratios |  |  |  |  |  |
Loss ratio | 51.6 | % |  | 61.0 | % |  | 56.5 | % |
Policy acquisition expense ratio | 21.4 |  |  | 17.9 |  |  | 19.6 |  |
General and administrative expense ratio | 15.8 |  |  | 20.4 |  |  | 20.9 |  | (1)
Expense ratio | 37.2 |  |  | 38.3 |  |  | 40.5 |  |
Combined ratio | 88.8 | % |  | 99.3 | % |  | 97.0 | % |
(1) | The general and administrative expense ratio in the “Total” column includes corporate and non-operating expenses.
The Company uses underwriting ratios as measures of performance. The loss ratio is the ratio of losses and loss adjustment expenses to net earned premiums. The policy acquisition expense ratio is the ratio of amortization of deferred policy acquisition costs to net earned premiums. The general and administrative expense ratio is the ratio of general, administrative and corporate expenses to net earned premiums. The combined ratio is the sum of the loss ratio, the policy acquisition expense ratio and the general and administrative expense ratio.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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