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Business Segments - Balance Sheet Items (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Accounts receivable, net:    
Accounts receivable, net $ 2,241.4 $ 2,344.0
Total assets:    
Total assets 5,286.0 5,412.6
Aviation segment    
Accounts receivable, net:    
Accounts receivable, net 786.0 776.0
Allowance for bad debt 6.9 6.6
Land segment    
Accounts receivable, net:    
Accounts receivable, net 712.2 737.5
Allowance for bad debt 9.2 8.2
Marine segment    
Accounts receivable, net:    
Accounts receivable, net 743.3 830.5
Allowance for bad debt 11.6 10.2
Operating Segments | Aviation segment    
Total assets:    
Total assets 2,049.4 2,050.6
Operating Segments | Land segment    
Total assets:    
Total assets 1,913.8 1,928.5
Operating Segments | Marine segment    
Total assets:    
Total assets 1,169.7 1,287.7
Corporate    
Total assets:    
Total assets $ 153.1 $ 145.8