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Business Segments (Details 2) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Accounts receivable, net:    
Accounts receivable, net $ 2,358.2 $ 2,307.4
Total assets:    
Total assets 5,102.5 4,880.1
Aviation Segment    
Accounts receivable, net:    
Accounts receivable, net 711.7 686.0
Allowance for bad debt 7.1 7.9
Marine segment    
Accounts receivable, net:    
Accounts receivable, net 952.0 974.0
Allowance for bad debt 9.5 8.4
Land Segment    
Accounts receivable, net:    
Accounts receivable, net 694.5 647.4
Allowance for bad debt 8.7 9.4
Operating Segments | Aviation Segment    
Total assets:    
Total assets 1,649.0 1,635.5
Operating Segments | Marine segment    
Total assets:    
Total assets 1,521.2 1,483.1
Operating Segments | Land Segment    
Total assets:    
Total assets 1,691.0 1,570.6
Corporate    
Total assets:    
Total assets $ 241.3 $ 190.9