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Organization (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended
	Dec. 31, 2009	Apr. 30, 2009 Helix Energy Limited [Member]
Sale of Helix reservoir consulting business		$ 25
Gain on sale of Helix Energy Limited	$ 8.3

Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

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