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Business Segments - Balance Sheet Items (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Accounts receivable, net:    
Accounts receivable, net [1] $ 2,062.6 $ 1,812.6
Total assets:    
Total assets [1] 5,152.5 4,525.3
Aviation Segment    
Accounts receivable, net:    
Accounts receivable, net 590.7 571.6
Allowance for bad debt 6.2 6.1
Land Segment    
Accounts receivable, net:    
Accounts receivable, net 747.1 629.8
Allowance for bad debt 7.4 7.2
Marine segment    
Accounts receivable, net:    
Accounts receivable, net 724.8 611.2
Allowance for bad debt 10.8 10.6
Operating Segments | Aviation Segment    
Total assets:    
Total assets 1,812.7 1,546.9
Operating Segments | Land Segment    
Total assets:    
Total assets 1,957.3 1,651.5
Operating Segments | Marine segment    
Total assets:    
Total assets 1,237.8 1,149.5
Corporate    
Total assets:    
Total assets $ 144.7 $ 177.3
[1] Amounts may not add due to rounding