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Business Segments (Details 2) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Accounts receivable, net:    
Accounts receivable, net $ 2,039.1 $ 2,306.4
Total assets:    
Total assets 4,972.9 4,880.5
Aviation Segment    
Accounts receivable, net:    
Accounts receivable, net 574.2 685.0
Allowance for bad debt 6.8 7.9
Marine segment    
Accounts receivable, net:    
Accounts receivable, net 748.4 974.0
Allowance for bad debt 9.9 8.4
Land Segment    
Accounts receivable, net:    
Accounts receivable, net 716.5 647.4
Allowance for bad debt 8.1 9.4
Operating Segments | Aviation Segment    
Total assets:    
Total assets 1,606.9 1,635.9
Operating Segments | Marine segment    
Total assets:    
Total assets 1,361.4 1,483.1
Operating Segments | Land Segment    
Total assets:    
Total assets 1,802.3 1,570.6
Corporate    
Total assets:    
Total assets $ 202.3 $ 190.9