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Income Taxes (Narrative) (Details) € in Millions, $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2021 EUR (€)	Mar. 31, 2021 AUD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 AUD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Apr. 11, 2019 USD ($)	Apr. 11, 2019 EUR (€)
Income Tax Contingency [Line Items]
Discrete Income Tax Expense (Benefit)	$ (20.3)					$ 164.4
Income tax expense, adjusted for discrete items	11.4					$ 12.4
Unrecognized tax benefits (inclusive of interest and penalties)	290.2						$ 286.1
Australian Taxation Office [Member] | Rowan Companies [Member]
Income Tax Contingency [Line Items]
Income Tax Examination, Estimate of Possible Loss	76.7		$ 101
Income Tax Examination, Penalties and Interest Expense				$ 29.0	$ 42
Unrecognized tax benefits (inclusive of interest and penalties)	18.0
Luxembourg Inland Revenue [Member] | Rowan Companies [Member]
Income Tax Contingency [Line Items]
Income Tax Examination, Estimate of Possible Loss	166.6	€ 142.0
Income Tax Examination, Penalties Accrued								$ 109.1	€ 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	92.7	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	$ 2.3	€ 2.0

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