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Commitments and Contingencies - Narrative (Details) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Jul. 31, 2016 ft² | Mar. 31, 2018 USD ($) ship berth | Dec. 31, 2017
Commitments and Contingencies |  |  |
Number of months considered to determine requirement of prepayment of debts |  | 24 months |
Cruise ships on order |  |  |
Commitments and Contingencies |  |  |
Aggregate cost of ships on order, not including TUI cruises on order | $ |  | $ 11,700.0 |
Deposit for the purchase of ships expected to enter service | $ |  | $ 419.0 |
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate |  | 55.90% | 54.00%
Line of Credit | Minimum |  |  |
Commitments and Contingencies |  |  |
Debt instrument covenant, minimum percentage of ownership by a person |  | 50.00% |
Debt Securities | Minimum |  |  |
Commitments and Contingencies |  |  |
Debt instrument covenant, minimum percentage of ownership by a person |  | 50.00% |
Royal Caribbean International Cruise Ships | Quantum Class Ship | Cruise ships on order |  |  |
Commitments and Contingencies |  |  |
Number of ships under construction |  | 2 |
Royal Caribbean International Cruise Ships | Oasis Class Ship | Cruise ships on order |  |  |
Commitments and Contingencies |  |  |
Number of ships under construction |  | 1 |
Royal Caribbean International Cruise Ships | Project Icon ships | Cruise ships on order |  |  |
Commitments and Contingencies |  |  |
Number of ships under construction |  | 2 |
Ship passenger capacity berths | berth |  | 25,250 |
Celebrity Cruise Ships | Project Edge Class Ships | Cruise ships on order |  |  |
Commitments and Contingencies |  |  |
Number of ships under construction |  | 4 |
Ship passenger capacity berths | berth |  | 12,200 |
Port of Miami Terminal [Member] |  |  |
Commitments and Contingencies |  |  |
Area of real estate property | ft² | 170,000 |  |
Operating lease term | 5 years |  |

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