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Shareholders' Equity (Share Issuance Narrative) (Details) - USD ($)		12 Months Ended
	Apr. 11, 2019	Dec. 31, 2020	Dec. 31, 2019
Shares Issuance [Line Items]
Stock Repurchase Program, Authorized Amount		$ 500,000,000.0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased		16,300,000
Stock Repurchased During Period, Shares		0
Rowan Companies [Member]
Shares Issuance [Line Items]
Business Combination, Consideration Transferred	$ 1,400,000,000	$ 1,402,800,000
Class A Ordinary Shares, U.S. [Member] | Rowan Companies [Member]
Shares Issuance [Line Items]
Number of ordinary shares	88,300,000
Shares Issued, Price Per Share	$ 15.88
Maximum
Shares Issuance [Line Items]
Common Stock, Additional Shares Authorized, Aggregate Nominal Amount		$ 26,431,699
Common Stock, Additional Shares Authorized, Percentage		33.30%
Maximum | Private Placement [Member]
Shares Issuance [Line Items]
Common Stock, Additional Shares Authorized, Aggregate Nominal Amount		$ 52,863,399
Common Stock, Additional Shares Authorized, Percentage		66.60%
Common Stock [Member] | Rowan Companies [Member]
Shares Issuance [Line Items]
Stock Issued During Period, Shares, New Issues			88,000,000.0

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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Per share or per unit amount of equity securities issued.

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