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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Gross amount of port costs included in passenger ticket revenues | $ 144.4 | $ 127.1 |
Adjustments for New Accounting Pronouncement [Member] | Other Assets [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification adjustment related to debt issuance costs |  |  | $ (139.8)
Adjustments for New Accounting Pronouncement [Member] | Long-term Debt [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reclassification adjustment related to debt issuance costs |  |  | $ 139.8

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