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Capital Structure | 9 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Capital Structure | Capital Structure The following table provides a summary of the Company’s authorized and issued share capital as at September 30, 2017 and December 31, 2016:
| As at September 30, 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 | 59,407,323 |  |  | 90 |  |  | 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 |
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 |  |  | 122 |  |  |  |  | 140 |
Additional paid-in capital as at September 30, 2017 was $951.8 million (December 31, 2016 — $1,259.6 million). Additional paid-in capital includes the aggregate liquidation preferences of the Company’s preference shares of $525.0 million (December 31, 2016 — $818.2 million) less issue costs of $13.1 million (December 31, 2016 — $21.1 million). Ordinary Shares. The following table summarizes transactions in the Company’s ordinary shares during the nine months ended September 30, 2017:
| Number of Ordinary Shares
Ordinary shares in issue as at December 31, 2016 | 59,774,464 |
Ordinary share transactions in the nine months ended September 30, 2017 |
Ordinary shares issued to employees under the 2013 share incentive plan and/or 2008 share purchase plan | 272,296 |
Ordinary shares issued to non-employee directors | 9,504 |
Ordinary shares repurchased | (648,941 | )
Ordinary shares in issue as at September 30, 2017 | 59,407,323 |
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 acquired and canceled 451,268 and 648,941 ordinary shares for the three and nine months ended September 30, 2017, respectively. The total consideration paid for the three and nine months ended September 30, 2017 was $20.0 million and $30.0 million, respectively, and the average price per ordinary share for the three and nine months ended September 30, 2017 was $44.32 and $46.23, respectively. The Company acquired and canceled 144,289 and 1,122,328 ordinary shares for the three and nine months ended September 30, 2016, respectively. The total consideration paid for the three and nine months ended September 30, 2016 was $6.5 million and $50.0 million, respectively, and the average price per ordinary share for the three and nine months ended September 30, 2016 was $45.17 and $44.55, respectively. 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 used a portion of the net proceeds from the offering to redeem the 7.250% Perpetual Non-Cumulative Preference Shares on July 3, 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 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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