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Business Combination (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Jul. 31, 2018
Jul. 31, 2018
Dec. 31, 2018
Apr. 30, 2019
Business Acquisition [Line Items]        
Revenue since acquisition     $ 130,100,000  
Net income since acquisition     3,300,000  
Transaction costs     $ 31,800,000  
Silversea Cruises        
Business Acquisition [Line Items]        
Percentage of business acquired 66.70% 66.70%    
Payments to acquire business $ 1,020,000,000.00      
Contingent consideration 44,000,000.0 $ 44,000,000.0    
Silversea Cruises        
Business Acquisition [Line Items]        
Long-term debt       $ 700,000,000
Silversea Cruises | Silversea Cruises        
Business Acquisition [Line Items]        
Long-term debt $ 700,000,000 $ 700,000,000    
Minimum | Silversea Cruises        
Business Acquisition [Line Items]        
Contingent consideration, shares (in shares)   0    
Maximum | Silversea Cruises        
Business Acquisition [Line Items]        
Contingent consideration, shares (in shares)   472,000