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Income Taxes (Narrative) (Details) € in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 11, 2019 EUR (€) | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 EUR (€) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Discrete Income Tax Expense (Benefit) |  | $ 47.3 |  | $ 1.2 |  | $ 211.7 | $ 0.6 |  |
Income tax expense, adjusted for discrete items |  | 31.5 |  | $ 33.8 |  | 43.9 | $ 64.7 |  |
Tax Assessment |  |  | $ 42.0 |  |  |  |  |  |
Deferred Tax Liabilities, Net |  | 37.1 |  |  |  | 37.1 |  |  | $ 99.0
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 | 159.6 |  | € 142.0 |
Deferred Other Tax Expense (Benefit) |  |  |  |  | 79.0 | 88.8 |  |  |
Deferred Tax Liabilities, Net |  | 104.5 |  |  |  | 104.5 |  |  |
Australian Taxation Office [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Tax Assessment |  |  |  |  |  | 101.0 |  |  |
Unrecognized tax benefit, maximum exposure |  |  | $ 29.0 |  |  | 69.7 |  |  |
Tax Assessment Liability |  | $ 15.6 |  |  |  | $ 15.6 |  |  |
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 |  |  |  |  |  |  |  |
4.875% Senior Notes Due 2022 Member [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.58% |  |  |  | 4.58% |  |  | 4.58%
5.40% Senior Notes Due 2042 [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.40% |  |  |  | 5.40% |  |  | 5.40%
7.38% Senior Notes Due 2025 [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.38% |  |  |  | 7.38% |  |  | 7.38%
4.75% Senior Notes Due 2024 Member [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.75% |  |  |  | 4.75% |  |  | 4.75%
5.85% Senior Notes Due 2044 [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.85% |  |  |  | 5.85% |  |  | 5.85%
Senior Notes | 4.875% Senior Notes Due 2022 Member [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.875% |  |  |  | 4.875% |  |  |
Senior Notes | 5.40% Senior Notes Due 2042 [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.40% |  |  |  | 5.40% |  |  |
Senior Notes | 7.38% Senior Notes Due 2025 [Member] |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.375% |  |  |  | 7.375% |  |  |
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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