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Unaudited Condensed Consolidated Financial Statements (Details) - Scenario, Forecast [Member] - Rowan Companies [Member] $ / shares in Units, shares in Millions	Oct. 22, 2018 USD ($) $ / shares shares
Description of the Business [Line Items]
Business Acquisition, Consideration Transferred | $	$ 2,300,000,000.0
Business Acquisition, Share Price | $ / shares	$ 8.11
Class A ordinary shares, U.S.
Description of the Business [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	283

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