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Taxation (Narrative) (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 22, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Partial write-down of U.S. deferred tax asset pursuant to the Tax Cuts and Jobs Act of 2017 | $ 36,700,000 |  |  |  |
Increase (decrease) in valuation allowance |  | $ 40,400,000 | $ 5,300,000 | $ 11,200,000 |
Income taxes paid |  | 9,749,000 | 341,000 | $ 343,000 |
Unrecognized tax benefits |  | 0 | 0 |  |
Interest and penalties accrued on unrecognized tax benefits |  | $ 0 | $ 0 |  |
Bermuda |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Statutory income tax rate |  | 0.00% |  |  |
U.S. |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Expected tax rate |  | 5.00% |  |  |
Foreign statutory income tax rate |  | 21.00% |  |  |
Operating loss carryforwards |  | $ 338,600,000 |  |  |
Ireland |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Foreign statutory income tax rate |  | 12.50% |  |  |
Operating loss carryforwards |  | $ 5,600,000 |  |  |
U.K. |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Foreign statutory income tax rate |  | 19.00% |  |  |
Operating loss carryforwards |  | $ 115,400,000 |  |  |
Singapore |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Foreign statutory income tax rate |  | 17.00% |  |  |
Operating loss carryforwards |  | $ 25,400,000 |  |  |
Switzerland |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Foreign statutory income tax rate |  | 21.20% |  |  |
Operating loss carryforwards |  | $ 186,600,000 |  |  |
Australia |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Foreign statutory income tax rate |  | 30.00% |  |  |
TMR |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred tax assets, valuation allowance |  |  |  |  | $ 35,700,000

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