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Income Taxes (Narrative) (Details) € in Millions, $ in Millions		3 Months Ended				12 Months Ended
	Apr. 11, 2019 EUR (€)	Mar. 31, 2020 EUR (€)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)
Income Tax Contingency [Line Items]
Discrete Income Tax Expense (Benefit)			$ 164.4		$ (0.6)
Income tax expense, adjusted for discrete items			12.4		$ 30.9
Tax Assessment				$ 42.0
Deferred Tax Liabilities, Net			35.2				$ 99.0
Rowan Companies [Member]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Gross			66.0
Luxembourg Inland Revenue [Member] | Rowan Companies [Member]
Income Tax Contingency [Line Items]
Tax Assessment | €	€ 93.0
Unrecognized tax benefit, maximum exposure		€ 142.0	156.7			€ 142.0
Deferred Other Tax Expense (Benefit)		79.0	87.2
Deferred Tax Liabilities, Net			102.6
Australian Taxation Office [Member] | Rowan Companies [Member]
Income Tax Contingency [Line Items]
Tax Assessment			101.0
Unrecognized tax benefit, maximum exposure			62.0	$ 29.0
Tax Assessment Liability			$ 13.6
Euro Member Countries, Euro | Luxembourg Inland Revenue [Member] | Rowan Companies [Member]
Income Tax Contingency [Line Items]
Other Tax Expense (Benefit) | €		€ 2.0
United States of America, Dollars | Luxembourg Inland Revenue [Member] | Rowan Companies [Member]
Income Tax Contingency [Line Items]
Deferred Other Tax Expense (Benefit) | €	€ 2.2

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