Annual report pursuant to Section 13 and 15(d)

Other Income (Expense), Net (Detail Textuals)

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Other Income (Expense), Net (Detail Textuals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Income and Expenses [Abstract]      
Other income (expense), net $ 10.4 $ 8.3 $ 46.7
Unrealized and realized losses on fuel swap derivative hedge contracts   16.1  
Gains on foreign currency exchange   4.5  
Gains (Losses) on foreign currency exchange derivative hedge contracts   $ 3.9  
Losses from dedesignation of certain fuel swap derivative hedge contracts and ineffectiveness of settled fuel swaps     30.7
Fair value adjustment of foreign exchange collar     26.2
Losses related to deferred revenue adjustment     $ 11.0