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Business Segments - Balance Sheet Items (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Accounts receivable, net:    
Accounts receivable, net $ 2,688.8 $ 2,739.6
Total assets:    
Total assets 5,797.5 5,676.9
Aviation segment    
Accounts receivable, net:    
Accounts receivable, net 1,074.7 992.2
Land segment    
Accounts receivable, net:    
Accounts receivable, net 820.9 846.1
Marine segment    
Accounts receivable, net:    
Accounts receivable, net 793.2 901.2
Operating Segments | Aviation segment    
Accounts receivable, net:    
Allowance for bad debt 15.8 17.7
Total assets:    
Total assets 2,416.4 2,261.0
Operating Segments | Land segment    
Accounts receivable, net:    
Allowance for bad debt 3.1 2.7
Total assets:    
Total assets 2,114.3 2,178.1
Operating Segments | Marine segment    
Accounts receivable, net:    
Allowance for bad debt 18.4 19.0
Total assets:    
Total assets 1,032.7 1,124.2
Corporate    
Total assets:    
Total assets $ 234.1 $ 113.6