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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Gross amount of port costs included in passenger ticket revenues | $ 158.7 | $ 156.8 | $ 443.1 | $ 425.6 |
Reclassification of dividends received from unconsolidated affiliates |  |  |  | $ 5.3 |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reclassification adjustment related to debt issuance costs |  |  |  |  | $ 139.8

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