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Income Taxes (Narrative) (Details) € in Millions, $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended				4 Months Ended	6 Months Ended		12 Months Ended
	Apr. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 EUR (€)	Apr. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Apr. 11, 2019 USD ($)	Apr. 11, 2019 EUR (€)
Income Tax Contingency [Line Items]
Discrete Income Tax Expense (Benefit)			$ (5.6)	$ 18.1			$ (2.2)
Income tax expense, adjusted for discrete items	$ 2.6	$ 9.5		$ 47.3			$ 14.0		$ 211.7
Income Tax Expense (Benefit) Excluding Discrete Items			$ 31.5					$ 43.9
Luxembourg Inland Revenue [Member] | Rowan Companies [Member]
Income Tax Contingency [Line Items]
Income Tax Examination, Estimate of Possible Loss					$ 168.4					$ 168.4	€ 142.0
Income Tax Examination, Penalties Accrued												$ 110.3	€ 93.0
Luxembourg Inland Revenue [Member] | Rowan Companies [Member] | Uncertain Tax Positions
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions					93.7	€ 79.0
Luxembourg Inland Revenue [Member] | Rowan Companies [Member] | Wealth tax
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions					$ 2.4	€ 2.0

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Estimated amount of loss resulting from an adverse tax position.

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The amount of estimated penalties accrued as of the balance sheet date arising from income tax examinations.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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