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Long-Term Debt - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2018
Jun. 30, 2018
Jul. 31, 2018
Long-Term Debt      
Long-term debt $ 130.0    
Short-term debt amount outstanding   $ 1,200.0  
Symphony of the Seas      
Long-Term Debt      
Long-term debt   $ 1,200.0  
Long term debt, term 12 years    
Fixed interest rate   3.82%  
LIBOR      
Long-Term Debt      
Debt Floating Rate   1.195%  
LIBOR | Silversea Cruises      
Long-Term Debt      
Debt Floating Rate   1.00%  
Subsequent Event      
Long-Term Debt      
Borrowings outstanding     $ 415.0
Subsequent Event | Silversea Cruises      
Long-Term Debt      
Long-term debt     $ 700.0