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Business Segments, Geographic Information, and Major Customers - Balance Sheet Items (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounts receivable, net:    
Accounts receivable, net $ 2,705.6 $ 2,344.0
Total assets:    
Total assets 5,587.8 5,412.6
Corporate    
Total assets:    
Total assets 158.9 145.8
Aviation segment    
Accounts receivable, net:    
Accounts receivable, net 1,013.0 776.0
Allowance for bad debt 10.8 6.6
Aviation segment | Operating Segments    
Total assets:    
Total assets 2,240.4 2,050.6
Land segment    
Accounts receivable, net:    
Accounts receivable, net 874.7 737.5
Allowance for bad debt 6.6 8.2
Land segment | Operating Segments    
Total assets:    
Total assets 2,091.4 1,928.5
Marine segment    
Accounts receivable, net:    
Accounts receivable, net 817.9 830.5
Allowance for bad debt 10.4 10.2
Marine segment | Operating Segments    
Total assets:    
Total assets $ 1,097.1 $ 1,287.7