Share-Based Payments	3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Payments	Share-Based Payments The Company had previously issued options and other equity incentives under the 2003 Share Incentive Plan, the 2013 Share Incentive Plan, the 2016 Stock Incentive Plan for Non-Employee Directors, the Amended 2006 Stock Option Plan, the 2008 Employee Share Purchase Plan and the Amended 2008 Sharesave Scheme. When options were exercised or other equity awards (excluding phantom shares) vested, new ordinary shares were issued as the Company did not hold treasury shares. Phantom shares were settled in cash in lieu of ordinary shares upon vesting. Immediately prior to the Merger, the Company took all actions necessary to enable and require existing participants in the ESPP to utilize their accumulated payroll deductions to purchase newly issued ordinary shares in accordance with the terms of the ESPP and, immediately after such purchases were completed, the Company terminated the ESPP. In accordance with the Merger Agreement, at the effective time of the Merger each issued and outstanding ordinary share of the Company (other than any ordinary shares that were owned by the Company as treasury shares, owned by any subsidiary of the Company or owned by Parent, Merger Sub or any subsidiary thereof) was automatically canceled and converted into the right to receive $42.75 in cash, without interest and less any required tax withholdings (the “Merger Consideration”). In addition, at the effective time of the Merger, all outstanding restricted share units and phantom shares, in each case, that were subject to performance-based vesting requirements, to the extent not vested, vested in full (with respect to any performance period that had been completed, determined based on actual level of performance achieved, and, with respect to any performance period that had not been completed, determined based on achievement of performance-based vesting requirements at target payout levels) and were cashed out based on the per share Merger Consideration. All other outstanding restricted share unit awards, to the extent not vested, vested in full and were cashed out based on the per share Merger Consideration plus a cash amount for any accrued but unpaid dividends in respect of such awards prior to the Effective Time. As a result, the total unrecognized share-based compensation expense related to the unvested awards was expensed and no share-based awards remain outstanding at March 31, 2019. For the three months ended March 31, 2019, the Company’s total share-based compensation expense was $21.6 million, which primarily related to the vesting of the share-based awards at the effective time of the Merger. Under the terms of the Merger Agreement, the settlement of these previously unvested share-based compensation awards totaling $21.6 million was funded by Parent.

Share-Based Payments

The Company had previously issued options and other equity incentives under the 2003 Share Incentive Plan, the 2013 Share Incentive Plan, the 2016 Stock Incentive Plan for Non-Employee Directors, the Amended 2006 Stock Option Plan, the 2008 Employee Share Purchase Plan and the Amended 2008 Sharesave Scheme. When options were exercised or other equity awards (excluding phantom shares) vested, new ordinary shares were issued as the Company did not hold treasury shares. Phantom shares were settled in cash in lieu of ordinary shares upon vesting. Immediately prior to the Merger, the Company took all actions necessary to enable and require existing participants in the ESPP to utilize their accumulated payroll deductions to purchase newly issued ordinary shares in accordance with the terms of the ESPP and, immediately after such purchases were completed, the Company terminated the ESPP.

In accordance with the Merger Agreement, at the effective time of the Merger each issued and outstanding ordinary share of the Company (other than any ordinary shares that were owned by the Company as treasury shares, owned by any subsidiary of the Company or owned by Parent, Merger Sub or any subsidiary thereof) was automatically canceled and converted into the right to receive $42.75 in cash, without interest and less any required tax withholdings (the “Merger Consideration”). In addition, at the effective time of the Merger, all outstanding restricted share units and phantom shares, in each case, that were subject to performance-based vesting requirements, to the extent not vested, vested in full (with respect to any performance period that had been completed, determined based on actual level of performance achieved, and, with respect to any performance period that had not been completed, determined based on achievement of performance-based vesting requirements at target payout levels) and were cashed out based on the per share Merger Consideration. All other outstanding restricted share unit awards, to the extent not vested, vested in full and were cashed out based on the per share Merger Consideration plus a cash amount for any accrued but unpaid dividends in respect of such awards prior to the Effective Time. As a result, the total unrecognized share-based compensation expense related to the unvested awards was expensed and no share-based awards remain outstanding at March 31, 2019.

For the three months ended March 31, 2019, the Company’s total share-based compensation expense was $21.6 million, which primarily related to the vesting of the share-based awards at the effective time of the Merger. Under the terms of the Merger Agreement, the settlement of these previously unvested share-based compensation awards totaling $21.6 million was funded by Parent.