Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net (Detail Textuals)

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Property and Equipment, Net (Detail Textuals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Abstract]      
Depreciation expense $ 534.9 $ 478.7 $ 411.4
Repairs and maintenance expenses including Dry-dock expenses 199.5 157.2 155.4
Interest costs capitalized $ 30.4 $ 29.0 $ 33.7