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General (Details)
destination in Thousands, $ in Millions
12 Months Ended
Jul. 31, 2018
USD ($)
ship
continent
Dec. 31, 2018
ship
destination
brand
Dec. 31, 2016
USD ($)
ship
Jul. 31, 2016
Schedule of Equity Method Investments [Line Items]        
Number of cruise brands | brand   4    
Number of ships in operation | ship   60    
Number of destinations | destination   1    
Loss from subsidiaries | $     $ 21.7  
Minimum        
Schedule of Equity Method Investments [Line Items]        
Investment in a joint venture, percentage of interest   20.00%    
Maximum        
Schedule of Equity Method Investments [Line Items]        
Investment in a joint venture, percentage of interest   50.00%    
TUI Cruises        
Schedule of Equity Method Investments [Line Items]        
Investment in a joint venture, percentage of interest   50.00%    
Pullmantur        
Schedule of Equity Method Investments [Line Items]        
Investment in a joint venture, percentage of interest   49.00%    
Number of ships in operation | ship   4 4  
Percentage of subsidiary which has been sold   51.00% 51.00% 51.00%
Retained ownership percentage of subsidiary after sale   49.00%    
Consolidation time lag   2 months    
SkySea Cruises        
Schedule of Equity Method Investments [Line Items]        
Investment in a joint venture, percentage of interest   36.00%    
Other income (expense) | Pullmantur        
Schedule of Equity Method Investments [Line Items]        
Loss from subsidiaries | $     $ 21.7  
Silversea Cruises        
Schedule of Equity Method Investments [Line Items]        
Number of continents | continent 7      
Percentage of business acquired 66.70%      
Payments to acquire business | $ $ 1,020.0      
Number of ships acquired | ship 9 9