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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Schedule of Liabilities Subject to Compromise (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Aug. 18, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Accrued Interest on Senior Notes, Exchangeable Senior Notes, Debentures and Revolving Credit Facility | $ 203.5 |  |
Rig holding costs(1) | 13.9 |  |
Total liabilities subject to compromise | 7,313.7 |  | $ 0.0
Senior Notes | 6.875% Senior notes due 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 122.9 |  |
Interest rate on borrowings outstanding |  | 6.875% |
Interest rate on borrowings outstanding |  | 6.875% |
Senior Notes | 4.70% Senior notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 100.7 |  |
Interest rate on borrowings outstanding |  | 4.70% |
Interest rate on borrowings outstanding |  | 4.70% |
Senior Notes | 4.875% Senior notes due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 620.8 |  |
Interest rate on borrowings outstanding |  | 4.875% |
Interest rate on borrowings outstanding |  | 4.875% |
Senior Notes | 3.00% Exchangeable senior notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 849.5 |  |
Interest rate on borrowings outstanding |  | 3.00% |
Interest rate on borrowings outstanding |  | 3.00% |
Senior Notes | 4.50% Senior notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 303.4 |  |
Interest rate on borrowings outstanding |  | 4.50% |
Interest rate on borrowings outstanding |  | 4.50% |
Senior Notes | 4.75% Senior notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 318.6 |  |
Interest rate on borrowings outstanding |  | 4.75% |
Interest rate on borrowings outstanding |  | 4.75% |
Senior Notes | 8.00% Senior notes due 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 292.3 |  |
Interest rate on borrowings outstanding |  | 8.00% |
Interest rate on borrowings outstanding |  | 8.00% |
Senior Notes | 5.20% Senior notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 333.7 |  |
Interest rate on borrowings outstanding |  | 5.20% |
Interest rate on borrowings outstanding |  | 5.20% |
Senior Notes | 7.375% Senior notes due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 360.8 |  |
Interest rate on borrowings outstanding |  | 7.375% |
Interest rate on borrowings outstanding |  | 7.375% |
Senior Notes | 7.75% Senior notes due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 1,000.0 |  |
Interest rate on borrowings outstanding |  | 7.75% |
Interest rate on borrowings outstanding |  | 7.75% |
Senior Notes | 7.20% Debentures due 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 112.1 |  |
Interest rate on borrowings outstanding |  | 7.20% |
Interest rate on borrowings outstanding |  | 7.20% |
Senior Notes | 7.875% Senior notes due 2040 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 300.0 |  |
Interest rate on borrowings outstanding |  | 7.875% |
Interest rate on borrowings outstanding |  | 7.875% |
Senior Notes | 5.40% Senior notes due 2042 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 400.0 |  |
Interest rate on borrowings outstanding |  | 5.40% |
Interest rate on borrowings outstanding |  | 5.40% |
Senior Notes | 5.75% Senior notes due 2044 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 1,000.5 |  |
Interest rate on borrowings outstanding |  | 5.75% |
Interest rate on borrowings outstanding |  | 5.75% |
Senior Notes | 5.85% Senior notes due 2044 |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 400.0 |  |
Interest rate on borrowings outstanding |  | 5.85% |
Interest rate on borrowings outstanding |  | 5.85% |
Line of Credit | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 581.0 |  |

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