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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
ship
berth
Apr. 30, 2019
berth
Feb. 28, 2019
berth
Dec. 31, 2018
Sep. 30, 2018
ship
berth
Commitments and Contingencies          
Number of months considered to determine requirement of prepayment of debts 24 months        
Cruise ships on order          
Commitments and Contingencies          
Aggregate cost of ships on order, not including TUI cruises on order | $ $ 11,400.0        
Deposit for the purchase of ships expected to enter service | $ $ 667.8        
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate 54.00%     53.50%  
Silversea Cruises | Cruise ships on order          
Commitments and Contingencies          
Number of ships under construction | ship 3        
Ship passenger capacity berths | berth 1,200        
Line of Credit | Minimum          
Commitments and Contingencies          
Debt instrument covenant, minimum percentage of ownership by a person 50.00%        
Debt Securities | Minimum          
Commitments and Contingencies          
Debt instrument covenant, minimum percentage of ownership by a person 50.00%        
Royal Caribbean International Cruise Ships | Quantum Class Ship | Cruise ships on order          
Commitments and Contingencies          
Number of ships under construction | ship 2        
Royal Caribbean International Cruise Ships | Oasis Class Ship | Cruise ships on order          
Commitments and Contingencies          
Number of ships under construction | ship 1        
Ship passenger capacity berths | berth     5,700    
Royal Caribbean International Cruise Ships | Project Icon ships | Cruise ships on order          
Commitments and Contingencies          
Number of ships under construction | ship 2        
Ship passenger capacity berths | berth 25,300        
Royal Caribbean International Cruise Ships | Silversea Cruises | Cruise ships on order          
Commitments and Contingencies          
Number of ships under construction | ship 2       2
Ship passenger capacity berths | berth         1,200
Celebrity Cruise Ships | Project Edge Class Ships | Cruise ships on order          
Commitments and Contingencies          
Number of ships under construction | ship 3        
Ship passenger capacity berths | berth 9,400        
Subsequent Event | Royal Caribbean International Cruise Ships | Project Edge Class Ships | Cruise ships on order          
Commitments and Contingencies          
Ship passenger capacity berths | berth   3,200