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Fair Value Measurements and Derivative Instruments (Derivative Instruments) (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
EUR (€)
Derivative instruments disclosure        
Maximum length of time hedged in derivative contract 3 years      
Aggregate cost of ships on order $ 14,800.0      
Amount deposited for cost of ships on order $ 881.5      
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate 65.90% 53.50%   65.90%
Exchange gains (losses) recorded in other income (expense) $ 0.4 $ 57.6 $ (75.6)  
Foreign currency forward | Not Designated        
Derivative instruments disclosure        
Notional amount 689.7      
Change in fair value of foreign currency forward contracts recognized in earnings 1.4 (62.4) 62.0  
Exchange gains (losses) recorded in other income (expense)   57.6 $ (75.6)  
Foreign currency forward | Designated as Hedging Instrument        
Derivative instruments disclosure        
Notional amount 194.2     € 173.0
Foreign exchange contracts        
Derivative instruments disclosure        
Notional amount $ 2,900.0 $ 3,700.0