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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Advertising costs $ 612.0 $ 506.0 $ 509.0    
Maximum length of time hedged in derivative contract (in years) 3 years        
Accounting Standards Update [Extensible Enumeration] Accounting Standards Update 2020-06 [Member]     Accounting Standards Update 2020-06 [Member]  
Retained earnings (accumulated deficit) $ 2,612.0 $ (10.0)      
Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Long-term debt         $ 161.0
Decrease to additional paid in capital         307.6
Retained earnings (accumulated deficit)         $ 146.2
Minimum | Ships          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life 30 years        
Residual value, percentage 10.00%        
Drydock services period 30 months        
Maximum | Ships          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Property, plant and equipment, useful life 35 years        
Residual value, percentage 15.00%        
Drydock services period 60 months