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Business Segments, Geographic Information, and Major Customers - Balance Sheet Items (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accounts receivable, net:    
Accounts receivable, net $ 2,739.6 $ 2,705.6
Total assets:    
Total assets 5,676.9 5,587.8
Corporate    
Total assets:    
Total assets 113.6 158.9
Aviation segment    
Accounts receivable, net:    
Accounts receivable, net 992.2 1,013.0
Allowance for bad debt 17.7 10.8
Aviation segment | Operating Segments    
Total assets:    
Total assets 2,261.0 2,240.4
Land segment    
Accounts receivable, net:    
Accounts receivable, net 846.1 874.7
Allowance for bad debt 2.7 6.6
Land segment | Operating Segments    
Total assets:    
Total assets 2,178.1 2,091.4
Marine segment    
Accounts receivable, net:    
Accounts receivable, net 901.2 817.9
Allowance for bad debt 19.0 10.4
Marine segment | Operating Segments    
Total assets:    
Total assets $ 1,124.2 $ 1,097.1