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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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