Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net (Textuals) (Details)

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Property and Equipment, Net (Textuals) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]      
Depreciation expense $ 627.7 $ 534.9 $ 478.7
Repairs and maintenance expenses including Dry-dock expenses 199.7 199.5 157.2
Interest costs capitalized 32.9 $ 30.4 $ 29.0
Ships improvements      
Property Plant And Equipment [Line Items]      
Costs associated with ship improvements $ 458.9