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Capital Structure | 12 Months Ended
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Dec. 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 December 31, 2017 and 2016:
|  | As at December 31, 2017 |  | 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 |  | 59,474,085 |  |  | 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 December 31, 2017 was $954.7 million (December 31, 2016 — $1,259.6 million). Included within additional paid-in capital is 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). (a) Ordinary Shares The following table summarizes transactions in the Company’s ordinary shares during the years ended December 31, 2017 and 2016:
|  | Number of Ordinary Shares
|  | 2017 |  | 2016
Ordinary shares in issue at the beginning of the year |  | 59,774,464 |  |  | 60,918,373 |
Ordinary shares issued to employees under the 2003 and 2013 share incentive plans and/or 2008 share purchase plan |  | 309,727 |  |  | 419,255 |
Ordinary shares issued to non-employee directors |  | 38,835 |  |  | 32,241 |
Ordinary shares repurchased |  | (648,941 | ) |  | (1,595,405 | )
Ordinary shares in issue at the end of the year |  | 59,474,085 |  |  | 59,774,464 |
Ordinary Share Repurchases in 2015. On February 5, 2015, the Company’s Board of Directors approved a share repurchase authorization program of $500.0 million. The share repurchase authorization program, which was effective immediately and expired on February 6, 2017, permitted the Company to effect the repurchases of ordinary shares from time to time through a combination of transactions, including open market repurchases, privately negotiated transactions and accelerated share repurchase transactions. During the course of 2015, the Company repurchased 1,790,333 ordinary shares for a total consideration of $83.7 million at an average price of $46.74 per ordinary share. The Company had $416.3 million remaining under its share repurchase authorization program in effect as at December 31, 2015. Ordinary Share Repurchases in 2016. During the course of 2016, the Company repurchased 1,595,076 ordinary shares for a total consideration of $75.0 million at an average price of $47.02 per ordinary share. The Company had $341.3 million remaining under its $500.0 million share repurchase authorization program in effect as at December 31, 2016. 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. Ordinary Share Repurchases in 2017. During the course of 2017, the Company repurchased 648,941 ordinary shares for a total consideration of $30.0 million at an average price of $46.23 per ordinary share. The Company had $220.0 million remaining under its $250.0 million share repurchase authorization program in effect as at December 31, 2017. (b) Preference Shares Preference Shares Issuance. 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, consisting of $250.0 million of total liquidation preference less $8.7 million of issuance expenses. The Company used $133.2 million of the net proceeds from the offering to redeem all of the Company’s outstanding 7.401% Preference Shares (defined below) and the remainder were used in the redemption of the Company's 7.250% Preference Shares (defined below) for $160.0 million. 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”. Preference Shares Redemption. On November 3, 2016, the Company issued a notice of redemption in connection with all of its issued and outstanding 7.401% Perpetual Non-Cumulative Preference Shares (the “7.401% Preference Shares”) (NYSE: AHLPRA). The redemption took place on January 3, 2017 and was conducted pursuant to the terms of the certificate of designation, dated November 15, 2006, governing the 7.401% Preference Shares. Each holder of a 7.401% Preference Share received $25 per 7.401% Preference Share, representing an aggregate amount of $133.2 million, plus all declared and unpaid dividends to the date of redemption. On May 8, 2017, the Company issued a notice of redemption in connection with all of its issued and outstanding 7.250% Perpetual Non-Cumulative Preference Shares (the “7.250% Preference Shares”) (NYSE: AHLPRB). The redemption took place on July 3, 2017 and was conducted pursuant to the terms of the certificate of designation, dated April 11, 2012, governing the 7.250% Preference Shares. Each holder of a 7.250% Preference Share received $25 per 7.250% Preference Share, representing an aggregate amount of $160.0 million, plus all declared and unpaid dividends to the date of redemption.

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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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