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Business Combination (Narrative) (Details) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 09, 2020 | Jul. 31, 2018 | Dec. 31, 2020 | Oct. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Interest acquired | 33.30% |  |  |  |  |  |
Common stock, shares issued (in shares) | 5,200,000 |  | 265,198,371 |  | 236,547,842 |  |
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01 |  |
Silversea Cruises |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Interest acquired | 33.30% |  | 33.30% |  |  |  |
Common stock, shares issued (in shares) | 5,200,000 |  |  |  |  |  |
Silversea Cruises |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of business acquired |  | 66.70% |  |  |  |  | 66.70%
Payments to acquire business |  | $ 1,020,000,000.00 |  |  |  |  |
Contingent consideration |  | 44,000,000.0 |  |  |  |  |
Silversea Cruises |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 700,000,000 |  |  |  | $ 700,000,000 |

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