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Restructuring (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
Restructuring Reserve [Roll Forward]  
Balance as of December 31, 2017 $ 32.0
Employee-related costs incurred 4.3
Paid during the period (7.8)
Restructuring charges as of March 31, 2018 28.5
Operating Segments | Aviation segment  
Restructuring Reserve [Roll Forward]  
Balance as of December 31, 2017 0.7
Employee-related costs incurred 0.7
Paid during the period (0.4)
Restructuring charges as of March 31, 2018 1.0
Operating Segments | Land segment  
Restructuring Reserve [Roll Forward]  
Balance as of December 31, 2017 25.0
Employee-related costs incurred 2.3
Paid during the period (3.5)
Restructuring charges as of March 31, 2018 23.9
Operating Segments | Marine segment  
Restructuring Reserve [Roll Forward]  
Balance as of December 31, 2017 1.3
Employee-related costs incurred 1.0
Paid during the period (0.8)
Restructuring charges as of March 31, 2018 1.6
Corporate  
Restructuring Reserve [Roll Forward]  
Balance as of December 31, 2017 5.0
Employee-related costs incurred 0.2
Paid during the period (3.2)
Restructuring charges as of March 31, 2018 $ 2.0
Minimum  
Restructuring Cost and Reserve [Line Items]  
Restructuring activities duration 12 months
Maximum  
Restructuring Cost and Reserve [Line Items]  
Restructuring activities duration 18 months