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Rowan Transaction (Narrative) (Details)		3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 11, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) jackup $ / shares	Jun. 30, 2019 USD ($) jackup $ / shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) jackup $ / shares	Jun. 30, 2018 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Apr. 10, 2019 jackup $ / shares	Dec. 31, 2018 $ / shares	Oct. 05, 2018 $ / shares
Business Acquisition [Line Items]
Number of Rigs Owned by ARO | jackup		7	7		7
Number of jackups leased by ARO | jackup		9	9		9
Number of Newbuild Jackup Rigs | jackup		20	20		20
Years for Jackup Rig Orders					10 years
Jackups Marked For Retirement | jackup		1	1		1					2
Number of Drillships owned by legacy Rowan | jackup		4	4		4
Number of Jackup Rigs Owned by Acquiree | jackup		19	19		19
Bargain purchase gain					$ 712,800,000	$ 8,300,000
Finite-Lived Intangible Assets, Remaining Amortization Period					2 years 6 months
Revenues		$ 583,900,000		$ 458,500,000	$ 989,800,000	875,500,000
Net Income (Loss) Attributable to Parent		$ 405,500,000		(151,000,000.0)	$ 215,100,000	$ (291,100,000)
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						$ 0.40
Rowan Companies [Member]
Business Acquisition [Line Items]
Jackups Marked For Retirement | jackup		2	2		2
Number of Drillships owned by legacy Rowan | jackup		4	4		4
Number of Jackup Rigs Owned by Acquiree | jackup		19	19		19
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Per Share | $ / shares	$ 43.67
Business Combination, Consideration Transferred	$ 1,402,800,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value	2,600,000
Bargain purchase gain	712,800,000
Business Combination, Acquisition Related Costs		$ 15,000,000.0			$ 17,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Materials And Supplies	83,000,000.0
Property and equipment	2,989,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	16,200,000	14,900,000	$ 14,900,000		14,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	2,100,000	1,900,000	1,900,000		1,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Amortization			$ 1,100,000
Deferred Other Tax Expense (Benefit)	10,000,000.0				52,000,000.0
Deferred Tax Assets, Net	$ 98,000,000.0
Unrecognized Tax Benefits, Increase Resulting from Acquisition					50,400,000
Unrecognized tax benefit, maximum exposure					$ 159,000,000.0
Revenues		$ 147,200,000
Net Income (Loss) Attributable to Parent				$ 95,300,000
Rowan Companies [Member] | Class A ordinary shares, U.S.
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned, Per Share | $ / shares	$ 2.750
Share Price | $ / shares	$ 15.88											$ 33.92
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	88,300,000
Stockholders' Equity Note, Stock Split, Conversion 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 [Member]
Business Acquisition [Line Items]
Capitalized Contract Cost, Amortization							$ 5,400,000	$ 5,100,000	$ 2,600,000
Minimum [Member] | Rowan Companies [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	30 years		16 years
Maximum [Member] | Rowan Companies [Member]
Business Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	35 years		35 years

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No definition available.

+ Details

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- Definition

Number of Newbuild Jackup Rigs

+ References

No definition available.

+ Details

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X

- Definition

Number of Rigs Owned by ARO

+ References

No definition available.

+ Details

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X

- Definition

Number of jackups leased by ARO

+ References

No definition available.

+ Details

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- Definition

Unrecognized tax benefit, maximum exposure

+ References

No definition available.

+ Details

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- Definition

Years for Jackup Rig Orders

+ References

No definition available.

+ Details

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- Details

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- Details

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