XML 56 R46.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Investments - Other Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment | $ 3.9 | $ 8.7 | $ 12.1 | $ 8.9
Initial investment |  | 3.3 | 2.3 | 3.3
Goodwill | 0.0 | 0.0 | (1.8) | (22.1)
Additional investment | 0.1 |  | 0.1 |
Distribution received |  |  | (9.3) | 0.0
Unrealized/realized gain/(loss) |  | 1.0 | 0.6 | 0.8
Closing value of investment | 4.0 | 13.0 | 4.0 | 13.0
MVI |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment | 0.4 | 0.6 | 0.5 | 0.8
Initial investment |  | 0.0 | 0.0 | 0.0
Goodwill |  |  | 0.0 |
Additional investment | 0.1 |  | 0.1 |
Distribution received |  |  | 0.0 |
Unrealized/realized gain/(loss) |  | 0.0 | (0.1) | (0.2)
Closing value of investment | 0.5 | 0.6 | 0.5 | 0.6
Chaspark |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment | 0.0 | 8.1 | 8.4 | 8.1
Initial investment |  | 0.0 | 0.0 | 0.0
Goodwill |  |  | 0.0 |
Additional investment | 0.0 |  | 0.0 |
Distribution received |  |  | (9.3) |
Unrealized/realized gain/(loss) |  | 1.0 | 0.9 | 1.0
Closing value of investment | 0.0 | 9.1 | 0.0 | 9.1
Bene |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment | 3.0 | 0.0 | 3.2 |
Initial investment |  | 3.3 | 0.0 |
Goodwill |  |  | 0.0 |
Additional investment | 0.0 |  | 0.0 |
Distribution received |  |  | 0.0 |
Unrealized/realized gain/(loss) |  | 0.0 | (0.2) |
Closing value of investment | 3.0 | $ 3.3 | 3.0 | $ 3.3
Digital Re |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment | 0.5 |  | 0.0 |
Initial investment |  |  | 2.3 |
Goodwill |  |  | (1.8) |
Additional investment | 0.0 |  | 0.0 |
Distribution received |  |  | 0.0 |
Unrealized/realized gain/(loss) |  |  | 0.0 |
Closing value of investment | $ 0.5 |  | $ 0.5 |

X
- Definition Equity Method Investment, Aggregate Cost [Roll Forward] + References No definition available. + Details
Name: | ahl_EquityMethodInvestmentAggregateCostRollForward
Namespace Prefix: | ahl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_EquityMethodInvestmentAggregateCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the amount of unrealized intercompany profits and losses on transactions between the Entity and unconsolidated subsidiaries (including certain corporate joint ventures, and noncontrolled corporations), accounted for under the equity method of accounting, which have not been eliminated in preparing the Entity's financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.3A-04) -URI http://asc.fasb.org/extlink&oid=27015204&loc=d3e355119-122828 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99375318&loc=d3e32367-111569 + Details
Name: | us-gaap_EquityMethodInvestmentUnrealizedIntercompanyProfitLossNotEliminatedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net cash outflow or inflow associated with the acquisition or sale of a business segment during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
Name: | us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ahl_MVIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ahl_ChasparkMaritimeHoldingsLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ahl_BeneAssicurazioniMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ahl_DigitalRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |