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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
Summary of Significant Accounting Policies      
Gross amount of port costs included in passenger ticket revenues $ 459.8 $ 442.9 $ 398.0
Threshold period for recognizing customer deposits as passenger ticket revenue 10 days    
Exchange gains (losses) recorded in other income (expense) (11.8) (1.6) (9.5)
Exposure under foreign currency forward contracts, foreign currency collar options, fuel call options, interest rate and fuel swap agreements 60.8 135.5  
Number Of Cruise Brands Wholly Owned 5    
Equity Method Investment, Ownership Percentage 50.00%    
Lower Limit
     
Summary of Significant Accounting Policies      
Equity Method Investment, Ownership Percentage 20.00%    
Upper Limit
     
Summary of Significant Accounting Policies      
Equity Method Investment, Ownership Percentage 50.00%    
TUI Cruises
     
Summary of Significant Accounting Policies      
Equity Method Investment, Ownership Percentage 50.00%    
Ships
     
Summary of Significant Accounting Policies      
Property plant equipment, useful life 30 years    
Projected residual value 15.00%    
Ships | Lower Limit
     
Summary of Significant Accounting Policies      
Estimated drydock period, maximum 30 months    
Ships | Upper Limit
     
Summary of Significant Accounting Policies      
Estimated drydock period, maximum 60 months    
Media advertising
     
Summary of Significant Accounting Policies      
Advertising costs 200.9 193.7 166.0
Brochure, production and direct mail costs
     
Summary of Significant Accounting Policies      
Advertising costs $ 130.4 $ 124.3 $ 104.1