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Business Combination (Narrative) (Details) - Silversea Cruises - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2018 | Jun. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Percentage of business acquired | 66.70% | 66.70% |  |
Payments to acquire business | $ 1,020,000,000 |  |  |
Contingent consideration | 44,000,000 | $ 44,000,000 |  |
Revenue since acquisition |  |  | $ 130,100,000 |
Net income since acquisition |  |  | 3,300,000 |
Transaction costs |  |  | $ 31,800,000 |
Silversea Cruises |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Long-term debt | $ 700,000,000 | $ 700,000,000 |  | $ 700,000,000
Minimum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration, shares (in shares) |  | 0 |  |
Maximum |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration, shares (in shares) |  | 472,000 |  |

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