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Income Taxes (Narrative) (Details) € in Millions, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 11, 2019 EUR (€) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 EUR (€) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 EUR (€) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Discrete Income Tax Expense (Benefit) |  | $ (13.8) |  |  | $ 18.4 |  | $ 197.9 | $ 19.0
Income tax expense, adjusted for discrete items |  | 8.1 |  |  | $ 19.9 |  | 52.0 | $ 84.6
Tax Assessment |  |  |  | $ 42.0 |  |  |  |
Deferred Tax Liabilities, Net |  | 37.3 |  | 99.0 |  |  | 37.3 |
Deferred Tax Assets, Net |  | 880.0 |  |  |  |  | 880.0 |
Unrecognized Tax Benefits |  | 120.0 |  |  |  |  | 120.0 |
Deferred Tax Assets, Capital Loss Carryforwards |  | 5,600.0 |  |  |  |  | 5,600.0 |
Rowan Companies [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Deferred Tax Assets, Gross |  | 66.0 |  |  |  |  | 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 |  |  | € 142.0 | 166.5 |
Deferred Other Tax Expense (Benefit) |  |  |  |  |  | 79.0 | 92.6 |
Deferred Tax Liabilities, Net |  | 109.0 |  |  |  |  | 109.0 |
Australian Taxation Office [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Tax Assessment |  |  |  |  |  |  | 101.0 |
Unrecognized tax benefit, maximum exposure |  |  |  | $ 29.0 |  |  | 72.3 |
Tax Assessment Liability |  | $ 16.4 |  |  |  |  | $ 16.4 |
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) | € | € 2.3 |  |  |  |  |  |  |
4.875% Senior Notes Due 2022 Member [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 487.50% |  |  |  |  | 487.50% |
5.40% Senior Notes Due 2042 [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 540.00% |  |  |  |  | 540.00% |
7.38% Senior Notes Due 2025 [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 737.50% |  |  |  |  | 737.50% |
4.75% Senior Notes Due 2024 Member [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 475.00% |  |  |  |  | 475.00% |
5.85% Senior Notes Due 2044 [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 585.00% |  |  |  |  | 585.00% |
Senior Notes | 4.75% Senior Notes Due 2024 Member [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.75% |  |  |  |  | 4.75% |
Senior Notes | 5.85% Senior Notes Due 2044 [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.85% |  |  |  |  | 5.85% |

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