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Business Segments - Balance Sheet Items (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accounts receivable, net:    
Accounts receivable, net $ 2,747.9 $ 2,739.6
Total assets:    
Total assets 5,751.2 5,676.9
Aviation segment    
Accounts receivable, net:    
Accounts receivable, net 1,099.1 992.2
Land segment    
Accounts receivable, net:    
Accounts receivable, net 872.2 846.1
Marine segment    
Accounts receivable, net:    
Accounts receivable, net 776.5 901.2
Operating Segments | Aviation segment    
Accounts receivable, net:    
Allowance for bad debt 14.4 17.7
Total assets:    
Total assets 2,400.6 2,261.0
Operating Segments | Land segment    
Accounts receivable, net:    
Allowance for bad debt 3.3 2.7
Total assets:    
Total assets 2,123.6 2,178.1
Operating Segments | Marine segment    
Accounts receivable, net:    
Allowance for bad debt 20.3 19.0
Total assets:    
Total assets 1,014.3 1,124.2
Corporate    
Total assets:    
Total assets $ 212.7 $ 113.6