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Rowan Transaction (Narrative) (Details) $ / shares in Units, € in Millions		3 Months Ended					9 Months Ended			12 Months Ended
	Apr. 11, 2019 USD ($) $ / shares shares	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) jackup $ / shares	Sep. 30, 2019 EUR (€)	Jun. 30, 2019	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) jackup $ / shares	Sep. 30, 2019 EUR (€)	Sep. 30, 2018 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Apr. 10, 2019 jackup $ / shares	Mar. 31, 2019 $ / shares	Oct. 05, 2018 $ / shares
Business Acquisition [Line Items]
Number of rigs owned by ARO | jackup			7				7
Number of jackups leased by ARO | jackup			9				9
Number of newbuild Jackup Rigs | jackup			20				20
Jackups Marked For Retirement | jackup												2
Number of Drillships owned by legacy Rowan | jackup			4				4
Number of Jackup Rigs Owned by Acquiree | jackup			19				19
Estimated bargain purchase gain							$ 659,800,000		$ 1,800,000
Amortization of deferred contract costs			$ 1,300,000				2,400,000
Deferred tax assets			988,000,000				$ 988,000,000
Remaining terms of underlying contracts							2 years 3 months 18 days	2 years 3 months 18 days
Revenues			551,300,000			$ 430,900,000	$ 1,541,100,000		1,306,400,000
Net losses			$ (197,100,000)			$ (145,000,000.0)	$ 18,000,000.0		$ (436,100,000)
Class A ordinary shares, U.S.
Business Acquisition [Line Items]
Common stock, par value per share (in dollars per share or pounds sterling per share) | $ / shares			$ 0.40				$ 0.40						$ 0.40
Rowan Companies
Business Acquisition [Line Items]
Jackups Marked For Retirement | jackup			2				2
Number of Drillships owned by legacy Rowan | jackup			4				4
Number of Jackup Rigs Owned by Acquiree | jackup			19				19
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Per Share | $ / shares	$ 43.67
Aggregate value of shares	$ 1,402,800,000
Estimated fair value of employee equity awards	2,600,000
Estimated bargain purchase gain			$ 53,000,000.0				$ 659,800,000
Transaction related costs			200,000				18,000,000.0
Fair value of materials and supplies	83,000,000.0
Property and equipment	2,975,600,000
Intangible assets	16,200,000		13,300,000				13,300,000
Intangible liabilities	2,100,000		1,600,000				1,600,000
Liabilities recognized			50,000,000.0	€ 46.0			51,000,000.0	€ 47.0
Deferred tax assets	100,000,000.0
Uncertain tax positions	$ 50,400,000
Revenues			138,900,000				286,200,000
Net losses			31,200,000				95,100,000
Rowan Companies | Luxembourg Inland Revenue
Business Acquisition [Line Items]
Income tax assesments			$ 101,000,000.0				101,000,000.0
Unrecognized tax benefit, maximum exposure							$ 155,000,000.0	€ 142.0
Rowan Companies | Class A ordinary shares, U.S.
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Per Share | $ / shares	$ 2.750
Closing price | $ / shares	$ 15.88													$ 33.92
Number of shares issued | shares	88,300,000
Consolidation ratio | shares	4
Common stock, par value per share (in dollars per share or pounds sterling per share) | $ / shares	$ 0.40											$ 0.10
Scenario, Forecast
Business Acquisition [Line Items]
Amortization of deferred contract costs		$ 1,300,000								$ 5,300,000	$ 5,100,000
Minimum | Rowan Companies
Business Acquisition [Line Items]
Useful lives	30 years				16 years
Maximum | Rowan Companies
Business Acquisition [Line Items]
Useful lives	35 years				35 years

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