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INVESTMENT IN TERMINAL JOINT VENTURE (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Financial information for equity method investment      
Current assets $ 90.8 $ 90.0  
Noncurrent assets 139.2 118.7  
Total assets 230.0 208.7  
Current liabilities 55.9 41.3  
Noncurrent liabilities 14.7 17.3  
Total liabilities 70.6 58.6  
Operating revenue 503.9 578.6 568.5
Operating costs and expenses 506.4 571.7 548.1
Operating (loss) income (2.5) 6.9 20.4
Income from continuing operations 9.5 26.3 35.9
Net income 9.5 26.3 35.9
Investments in affiliates      
Company's share of net income 3.2 8.6 12.8
Dividends from the unconsolidated terminal venture   5.3 7.0
Ocean Transportation
      
Investments in affiliates      
Cost of services from transactions with unconsolidated affiliate 163.8 175.2 157.3
SSAT | Ocean Transportation
      
Investments in affiliates      
Ownership interest in SSAT (as a percent) 35.00%    
Number of terminal facilities on which SSAT provides terminal and stevedoring services to Matnav and numerous international carriers 6    
Cost of services from transactions with unconsolidated affiliate 163.8 175.2 157.3
Company's share of net income $ 3.2 $ 8.6 $ 12.8