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Share Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 23, 2017 | May 24, 2016 | Apr. 30, 2018 | Mar. 31, 2018 | Jan. 31, 2018 | May 31, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan outstanding from ESOP |  |  |  |  |  |  |  |  | $ 2.0 | $ 2.6 |  |
Number of awards exercisable (in shares) |  |  |  |  |  |  |  |  | 320,882 |  |  |
Weighted- average remaining contractual life (years) |  |  |  |  |  |  |  |  | 1 year 11 months | 2 years 5 months |  |
Cash received from options exercised |  |  |  |  |  |  |  |  | $ 0.5 | $ 0.9 | $ 0.1 |
Tax benefit realized for the tax deductions from option exercises |  |  |  |  |  |  |  |  | $ 0.2 | $ 0.3 | $ 0.3 |
Weighted average fair value of options granted (in USD per share) |  |  |  |  |  |  |  |  | $ 11.02 | $ 9.82 | $ 9.39 |
Total intrinsic value of options exercised |  |  |  |  |  |  |  |  | $ 9.3 | $ 1.4 | $ 1.4 |
Total unrecognized compensation cost related to share options |  |  |  |  |  |  |  |  | $ 3.8 | $ 3.4 |  |
Options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation cost related to share options, period for recognition |  |  |  |  |  |  |  |  | 1 year 9 months |  |  |
Market Value Options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of awards exercisable (in shares) |  |  |  |  |  |  |  |  | 126,000 |  |  |
Market Value Options | Tranche One |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vestiing percentage |  |  |  |  |  |  |  |  |  |  |  | 40.00%
Market Value Options | Tranche Two |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vestiing percentage |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Market Value Options | Tranche Three |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vestiing percentage |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Market Value Options | Tranche Four |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vestiing percentage |  |  |  |  |  |  |  |  |  |  |  | 20.00%
Executive Share Option Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award expiration period |  |  |  |  |  |  |  |  | 10 years |  |  |
Long-Term Umbrella Incentive Plan (LTIP) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |
Award expiration period |  |  |  |  |  |  |  |  | 5 years |  |  |
Long-Term Umbrella Incentive Plan (LTIP) | Tranche One |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vestiing percentage |  |  |  |  |  |  |  |  | 33.33% |  |  |
Long-Term Umbrella Incentive Plan (LTIP) | Tranche Two |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vestiing percentage |  |  |  |  |  |  |  |  | 33.33% |  |  |
Long-Term Umbrella Incentive Plan (LTIP) | Tranche Three |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vestiing percentage |  |  |  |  |  |  |  |  | 33.33% |  |  |
Long-Term Umbrella Incentive Plan (LTIP) | Restricted Stock Units and Options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |  | 3 years | 3 years |  |  |  |
Award expiration period |  |  |  | 2 years |  |  | 2 years | 2 years |  |  |  |
Award granted during period (in shares) |  |  |  | 432,600 |  |  | 139,800 | 95,140 |  |  |  |
Non-Executive Directors Equity Incentive Plan (Director EIP) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 1 year |  |  |
Non-Executive Directors Equity Incentive Plan (Director EIP) | Restricted Stock Units and Options |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award granted during period (in shares) | 21,814 | 12,520 | 11,936 |  |  |  |  |  |  |  |  |
Award fully vested and settled period after grant date |  |  |  |  |  |  | 1 year |  |  |  |  |
Non-Executive Directors Equity Incentive Plan (Director EIP) | Restricted Stock Units and Options | Tranche One |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  | 3 years |  |  |  |  |  |  |  |  |
Award granted during period (in shares) |  |  | 2,000 |  |  |  |  |  |  |  |  |
Non-Executive Directors Equity Incentive Plan (Director EIP) | Restricted Stock Units and Options | Tranche Two |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award granted during period (in shares) |  |  | 9,936 |  |  |  |  |  |  |  |  |
Award fully vested and settled period after grant date |  |  | 1 year |  |  |  |  |  |  |  |  |
Employee Benefit Trust | Ordinary shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Market value of shares held by ESOP (in USD per share) |  |  |  |  |  |  |  |  | $ 17.63 | $ 15.80 |  |
Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares to be acquired within twelve months of appointment |  |  |  |  | 21,000 |  |  |  |  |  |  |
Chief Financial Officer | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |  |  |  |  |  |
Chief Financial Officer | Performance Shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity instruments other than options, grants in period (over) (in shares) |  |  |  |  | 30,000 |  |  |  |  |  |  |
Number of vesting shares when lower target achieved |  |  |  |  | 5,000 |  |  |  |  |  |  |
Number of vesting shares when mid-point target achieved |  |  |  |  | 10,000 |  |  |  |  |  |  |
Number of vesting shares when top target achieved |  |  |  |  | 15,000 |  |  |  |  |  |  |
CEO |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares to be acquired within twelve months of appointment |  |  |  |  |  | 22,500 |  |  |  |  |  |
CEO | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 4 years |  |  |  |  |  |
Equity instruments other than options, grants in period (over) (in shares) |  |  |  |  |  | 60,000 |  |  |  |  |  |
CEO | Performance Shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of vesting shares when lower target achieved |  |  |  |  |  | 30,000 |  |  |  |  |  |
Number of vesting shares when mid-point target achieved |  |  |  |  |  | 40,000 |  |  |  |  |  |
Number of vesting shares when top target achieved |  |  |  |  |  | 50,000 |  |  |  |  |  |
Within Twelve Months of Appointment | CEO | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 3 years |  |  |  |  |  |
Equity instruments other than options, grants in period (over) (in shares) |  |  |  |  |  | 45,000 |  |  |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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