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Income Taxes (Narrative) (Details) € in Millions, $ in Millions	3 Months Ended						4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 EUR (€)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 EUR (€)	Apr. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Apr. 11, 2019 USD ($)	Apr. 11, 2019 EUR (€)
Income Tax Contingency [Line Items]
Discrete Income Tax Expense (Benefit)	$ (39.2)						$ (2.2)	$ (44.8)
Income tax expense, adjusted for discrete items	14.1	$ (13.8)					$ 14.0	$ 23.6		$ 197.9
Income Tax Expense (Benefit) Excluding Discrete Items	$ 8.1								$ 52.0
Luxembourg Inland Revenue [Member] | Rowan Companies [Member]
Income Tax Contingency [Line Items]
Income Tax Examination, Estimate of Possible Loss			$ 164.5		$ 164.5	€ 142.0
Income Tax Examination, Penalties Accrued											$ 107.7	€ 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			91.5	€ 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			$ 2.3	€ 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 the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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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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