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Business Combination (Details) - USD ($)
Jul. 31, 2018
Apr. 30, 2019
Silversea Cruises    
Business Acquisition [Line Items]    
Percentage of interests acquired 66.70%  
Payments to acquire business $ 1,020,000,000.00  
Contingent consideration 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  
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