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Debt Debt (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 15, 2020 | Jun. 29, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  | $ (3,100,000) |  |
Debt Instrument, Capitalization Ratio |  | 60.00% |  |  | 57.70% |  |
Asset Impairment Charges |  |  | $ 838,000,000.0 | $ 2,500,000 | $ 3,646,200,000 | $ 2,500,000 |
Letters of credit outstanding, amount |  |  | $ 112,900,000 |  | $ 112,900,000 |  |
7.38% Senior notes due 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.875% |  | 7.875% |  | 7.875%
4.875% Senior Notes Due 2022 Member [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.58% |  | 4.58% |  | 4.58%
4.75% Senior Notes Due 2024 Member [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.75% |  | 4.75% |  | 4.75%
7.38% Senior Notes Due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.38% |  | 7.38% |  | 7.38%
5.40%SeniorNotesDue2042 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.40% |  | 5.40% |  | 5.40%
5.85%SeniorNotesDue2044 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.85% |  | 5.85% |  | 5.85%
8.00% senior notes due 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.00% |  | 8.00% |  | 8.00%
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line Of Credit Facility, Available Cash |  |  | $ 200,000,000.0 |  | $ 200,000,000.0 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 1,000,000,000.0 |  | 1,000,000,000.0 |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  | 588,800,000 |  | 588,800,000 |  |
Letters of credit outstanding, amount |  |  | 37,800,000 |  | 37,800,000 |  |
Second Waiver [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  | 630,000,000.0 |  | 630,000,000.0 |  |
Senior Notes | 7.38% Senior notes due 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 201,400,000 |  | $ 201,400,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.875% |  | 7.875% |  |
Senior Notes | 4.875% Senior Notes Due 2022 Member [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 620,800,000 |  | $ 620,800,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.875% |  | 4.875% |  |
Senior Notes | 4.75% Senior Notes Due 2024 Member [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 398,100,000 |  | $ 398,100,000 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.75% |  | 4.75% |  |
Senior Notes | 7.38% Senior Notes Due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 500,000,000.0 |  | $ 500,000,000.0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.375% |  | 7.375% |  |
Senior Notes | 5.40%SeniorNotesDue2042 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.40% |  | 5.40% |  |
Senior Notes | 5.85%SeniorNotesDue2044 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.85% |  | 5.85% |  |
Senior Notes | 8.00% senior notes due 2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.00% |  | 8.00% |  |
Senior Notes | 3.00%exchangebalenotesdue2024 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.00% |  | 3.00% |  |
Senior Notes | Rowan Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 2,100,000,000 |  | $ 2,100,000,000 |  |
Senior Notes | 7.75%seniornotesdue2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.75% |  | 7.75% |  |
Convertible Debt [Member] | Three Percent Exchangeable Senior Notes Due Two Thousand Twenty Four [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 849,500,000 |  | $ 849,500,000 |  |
Debt Instrument, Convertible, Conversion Ratio |  |  |  |  | 17.8336 |  |
Debt Instrument, Convertible, Conversion Price |  |  | $ 56.08 |  | $ 56.08 |  |
Subsequent Event [Member] | Senior Notes | 4.875% Senior Notes Due 2022 Member [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Percent Outstanding | 44.00% |  |  |  |  |  |
Subsequent Event [Member] | Senior Notes | 4.75% Senior Notes Due 2024 Member [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Percent Outstanding | 74.20% |  |  |  |  |  |
Subsequent Event [Member] | Senior Notes | 7.38% Senior Notes Due 2025 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Percent Outstanding | 65.30% |  |  |  |  |  |
Subsequent Event [Member] | Senior Notes | 5.40%SeniorNotesDue2042 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Percent Outstanding | 68.90% |  |  |  |  |  |
Subsequent Event [Member] | Senior Notes | 5.85%SeniorNotesDue2044 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Percent Outstanding | 82.90% |  |  |  |  |  |

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