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Shareholders' Equity	9 Months Ended
	Sep. 30, 2017
Equity [Abstract]
Stockholders' Equity	Shareholders' Equity As a U.K. company governed in part by the Companies Act, we cannot issue new shares (other than in limited circumstances) without being authorized by our shareholders. At our last annual general meeting held on May 22, 2017, our shareholders authorized the allotment of 101.1 million Class A ordinary shares (or 202.2 million Class A ordinary shares in connection with an offer by way of a rights issue or other similar issue) for a period up to the conclusion of our 2018 annual general meeting (or, if earlier, at the close of business on August 22, 2018). On October 5, 2017 in conjunction with the approval of the Merger, our shareholders authorized an increase in our allotment to reflect our expected enlarged share capital immediately following the completion of the Merger. As a result of the authorization, our share allotment increased to 146.1 million Class A ordinary shares (or 292.2 million Class A ordinary shares in connection with an offer by way of a rights issue or other similar issue). In connection with the Merger on October 6, 2017, we issued 134.1 million Ensco Class A ordinary shares to Atwood shareholders.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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