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Leases - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
ship
Lessee, Lease, Description [Line Items]  
Number of ships under finance leases | ship 2
Additional lease term 6 years
Variable lease cost $ 34.3
Option to extend, value $ 41.0
Pullmantur and CDF Croisieres de France  
Lessee, Lease, Description [Line Items]  
Percentage of subsidiary which has been sold 51.00%
Minimum | Real Estate  
Lessee, Lease, Description [Line Items]  
Renewal term 1 year
Minimum | Berthing Agreement  
Lessee, Lease, Description [Line Items]  
Renewal term 1 year
Maximum | Real Estate  
Lessee, Lease, Description [Line Items]  
Renewal term 10 years
Maximum | Berthing Agreement  
Lessee, Lease, Description [Line Items]  
Renewal term 20 years