The amount of port costs that vary with head counts included in revenues.

No definition available.

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- Definition

Revenue, Performance Obligation, Expected Timing Of Satisfaction, Period

+ References

No definition available.

+ Details

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- Definition

Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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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
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-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044

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+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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Revenues - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
Revenues - Narrative (Details) - USD ($) $ in Millions	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