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General (Details) destination in Thousands, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2018 USD ($) ship continent | Dec. 31, 2018 ship destination brand | Dec. 31, 2016 USD ($) ship | Jul. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of cruise brands | brand |  | 4 |  |
Number of ships in operation | ship |  | 60 |  |
Number of destinations | destination |  | 1 |  |
Loss from subsidiaries | $ |  |  | $ 21.7 |
Minimum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in a joint venture, percentage of interest |  | 20.00% |  |
Maximum |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in a joint venture, percentage of interest |  | 50.00% |  |
TUI Cruises |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in a joint venture, percentage of interest |  | 50.00% |  |
Pullmantur |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in a joint venture, percentage of interest |  | 49.00% |  |
Number of ships in operation | ship |  | 4 | 4 |
Percentage of subsidiary which has been sold |  | 51.00% | 51.00% | 51.00%
Retained ownership percentage of subsidiary after sale |  | 49.00% |  |
Consolidation time lag |  | 2 months |  |
SkySea Cruises |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investment in a joint venture, percentage of interest |  | 36.00% |  |
Other income (expense) | Pullmantur |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Loss from subsidiaries | $ |  |  | $ 21.7 |
Silversea Cruises |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of continents | continent | 7 |  |  |
Percentage of business acquired | 66.70% |  |  |
Payments to acquire business | $ | $ 1,020.0 |  |  |
Number of ships acquired | ship | 9 | 9 |  |

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