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Business Segments - Balance Sheet Items (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Accounts receivable, net:    
Accounts receivable, net $ 2,728.7 $ 2,739.6
Total assets:    
Total assets 5,733.2 5,676.9
Aviation segment    
Accounts receivable, net:    
Accounts receivable, net 976.8 992.2
Land segment    
Accounts receivable, net:    
Accounts receivable, net 941.5 846.1
Marine segment    
Accounts receivable, net:    
Accounts receivable, net 810.4 901.2
Operating Segments | Aviation segment    
Accounts receivable, net:    
Allowance for bad debt 13.5 17.7
Total assets:    
Total assets 2,283.7 2,261.0
Operating Segments | Land segment    
Accounts receivable, net:    
Allowance for bad debt 2.7 2.7
Total assets:    
Total assets 2,208.0 2,178.1
Operating Segments | Marine segment    
Accounts receivable, net:    
Allowance for bad debt 18.8 19.0
Total assets:    
Total assets 1,057.8 1,124.2
Corporate    
Total assets:    
Total assets $ 183.8 $ 113.6