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Revenues - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Capitalized Contract Cost [Line Items] |  |  |
Port costs included in revenues | $ 136.7 | $ 134.5 |
Contract liability | 1,800.0 |  | $ 1,400.0
Contract with customer, liability, revenue recognized |  |  | 1,300.0
Contract asset | 59.5 |  | 60.1
Travel Agent Sales Commissions |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Capitalized Contract Cost, Gross | $ 80.2 |  | $ 64.6
Minimum |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Length of cruise | 2 days |  |
Maximum |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Length of cruise | 23 days |  |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045 + Details
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