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Capital Structure | 3 Months Ended
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Mar. 31, 2017
Equity [Abstract] |
Capital Structure | Capital Structure The following table provides a summary of the Company’s authorized and issued share capital as at March 31, 2017 and December 31, 2016:
| As at March 31, 2017 |  | As at December 31, 2016
| Number |  | $ in Thousands |  | Number |  | $ in Thousands
Authorized share capital: |  |  |  |  |  |  |
Ordinary Shares 0.15144558¢ per share | 969,629,030 |  |  | 1,469 |  |  | 969,629,030 |  |  | 1,469 |
Non-Voting Shares 0.15144558¢ per share | 6,787,880 |  |  | 10 |  |  | 6,787,880 |  |  | 10 |
Preference Shares 0.15144558¢ per share | 100,000,000 |  |  | 152 |  |  | 100,000,000 |  |  | 152 |
Total authorized share capital |  |  | 1,631 |  |  |  |  | 1,631 |
Issued share capital: |  |  |  |  |  |  |
Issued ordinary shares of 0.15144558¢ per share | 59,988,434 |  |  | 91 |  |  | 59,774,464 |  |  | 91 |
Issued 7.401% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share | — |  |  | — |  |  | 5,327,500 |  |  | 8 |
Issued 7.250% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share | 6,400,000 |  |  | 10 |  |  | 6,400,000 |  |  | 10 |
Issued 5.95% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share | 11,000,000 |  |  | 17 |  |  | 11,000,000 |  |  | 17 |
Issued 5.625% preference shares of 0.15144558¢ each with a liquidation preference of $25 per share | 10,000,000 |  |  | 15 |  |  | 10,000,000 |  |  | 15 |
Total issued share capital |  |  | 133 |  |  |  |  | 140 |
Additional paid-in capital as at March 31, 2017 was $1,142.1 million (December 31, 2016 — $1,259.6 million). Additional paid-in capital includes the aggregate liquidation preferences of the Company’s preference shares of $685.0 million (December 31, 2016 — $818.2 million) less issue costs of $18.7 million (December 31, 2016 — $21.1 million). Ordinary Shares. The following table summarizes transactions in the Company’s ordinary shares during the three months ended March 31, 2017:
| Number of Ordinary Shares
Ordinary shares in issue as at December 31, 2016 | 59,774,464 |
Ordinary share transactions in the three months ended March 31, 2017 |
Ordinary shares issued to employees under the 2013 share incentive plan and/or 2008 share purchase plan | 207,026 |
Ordinary shares issued to non-employee directors | 6,944 |
Ordinary shares repurchased | — |
Ordinary shares in issue as at March 31, 2017 | 59,988,434 |
Share Repurchase Authorization Program. On February 8, 2017, the Company’s Board of Directors approved a new share repurchase authorization program of $250.0 million. The new share repurchase authorization program, which was effective immediately and expires on February 8, 2019, permits the Company to effect the repurchases of its ordinary shares from time to time through a combination of transactions, including open market purchases, privately negotiated transactions and accelerated share repurchase transactions. The Company did not acquire and cancel any ordinary shares for the three months ended March 31, 2017. The Company acquired and cancelled 568,239 ordinary shares for the three months ended March 31, 2016 under open market repurchases. The total consideration paid for the three months ended March 31, 2016 was $25.0 million and the average price per ordinary share was $44.00. Preference Share Issuance and Redemption. On September 20, 2016, the Company issued 10,000,000 shares of 5.625% Perpetual Non-Cumulative Preference Shares (the “5.625% Preference Shares”). The 5.625% Preference Shares have a liquidation preference of $25 per share. Net proceeds were $241.3 million, comprising $250.0 million of total liquidation preference less $8.7 million of issuance expenses. The Company used a portion of the net proceeds from the offering to redeem the Company’s outstanding 7.401% Perpetual Non-Cumulative Preference Shares on January 3, 2017 and intends to use a portion of the net proceeds from the offering to redeem the 7.250% Perpetual Non-Cumulative Preference Shares on July 1, 2017. The 5.625% Preference Shares rank equally with preference shares previously issued by the Company and have no fixed maturity date. The Company may redeem all or a portion of the 5.625% Preference Shares at a redemption price of $25 per share on or after January 1, 2027. The 5.625% Preference Shares are listed on the NYSE under the symbol “AHLPRD”.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 6: 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(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 8: 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(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 + Details
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