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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Gross amount of port costs included in passenger ticket revenues | $ 569.5 | $ 570.3 | $ 561.1
Exchange gains (losses) recorded in other income (expense) | (75.6) | 39.8 | 34.6
Exposure under foreign currency forward contracts, foreign currency collar options, fuel call options, interest rate and fuel swap agreements | $ 212.8 |  |
Ships |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Property, plant and equipment, useful life | 30 years |  |
Projected residual value | 15.00% |  |
Ships | Lower Limit |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Drydock services period | 30 months |  |
Ships | Upper Limit |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Drydock services period | 60 months |  |
Media advertising |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Advertising costs | $ 233.5 | 240.3 | 242.8
Brochure, production and direct mail costs |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Advertising costs | $ 126.7 | 120.8 | $ 127.1
Marketing, Selling and Administrative Expenses |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Restructuring charges |  | $ 8.5 |

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