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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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