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EQUITY IN NET ASSETS OF NON-CONSOLIDATED INVESTEES (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
Jul. 31, 2008
Bluewater Gandria NV
Jan. 31, 2012
Bluewater Gandria NV
Subsequent event
Jan. 18, 2012
Bluewater Gandria NV
Subsequent event
Dec. 31, 2011
Egyptian Company for Gas Services S.A.E
Mar. 31, 2006
Egyptian Company for Gas Services S.A.E
Equity method investments acquired:          
Percentage of voting interest acquired 50.00% 50.00% 50.00%   50.00%
Purchase of equity method investment $ 22.0   $ 19.5    
Common stock purchased (in shares)         0.5
Common stock purchased, price per share         $ 1
Ownership percentage, equity method investment 50.00%     50.00% 50.00%
Investee capital share amount called       7.5  
Cash paid to maintain equity interest       $ 3.75