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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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