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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 | Jun. 30, 2021 | Apr. 30, 2021 | Dec. 31, 2020 | Aug. 18, 2020 | Jun. 30, 2020
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Liabilities Subject To Compromise, Accrued Interest On Notes |  |  | $ 203.5 |  |
Liabilities Subject To Compromise, Holding Cost, Inclusive Of Interest |  |  | 13.9 |  |
LIABILITIES SUBJECT TO COMPROMISE | $ 0.0 | $ 0.0 | 7,313.7 |  | $ 7,313.7
Senior Notes | Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 122.9 |  |
Interest rate on borrowings outstanding |  |  |  | 6.875% |
Senior Notes | Four Point Seven Zero Percent Senior Notes Due Twenty Twenty One [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 100.7 |  |
Interest rate on borrowings outstanding |  |  |  | 4.70% |
Senior Notes | Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 620.8 |  |
Interest rate on borrowings outstanding |  |  |  | 4.875% |
Senior Notes | Three Point Zero Percent Exchangeable Senior Notes Due Twenty Twenty Four [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 849.5 |  |
Interest rate on borrowings outstanding |  |  |  | 3.00% |
Senior Notes | Four Point Five Percent Senior Notes Due Twenty Twenty Four [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 303.4 |  |
Interest rate on borrowings outstanding |  |  |  | 4.50% |
Senior Notes | Four Point Seven Five Percent Senior Notes Due Twenty Twenty Four [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 318.6 |  |
Interest rate on borrowings outstanding |  |  |  | 4.75% |
Senior Notes | Eight Point Zero Percent Senior Notes Due Twenty Twenty Four [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 292.3 |  |
Interest rate on borrowings outstanding |  |  |  | 8.00% |
Senior Notes | Five Point Two Zero Percent Senior Notes Due Twenty Twenty Five [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 333.7 |  |
Interest rate on borrowings outstanding |  |  |  | 5.20% |
Senior Notes | Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 360.8 |  |
Interest rate on borrowings outstanding |  |  |  | 7.375% |
Senior Notes | Seven Point Seven Five Percent Senior Notes Due Twenty Twenty Six [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 1,000.0 |  |
Interest rate on borrowings outstanding |  |  |  | 7.75% |
Senior Notes | Seven Point Two Zero Percent Debentures Due Twenty Twenty Seven [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 112.1 |  |
Interest rate on borrowings outstanding |  |  |  | 7.20% |
Senior Notes | Seven Point Eight Seven Five Percent Senior Notes Due Twenty Forty [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 300.0 |  |
Interest rate on borrowings outstanding |  |  |  | 7.875% |
Senior Notes | Five Point Four Zero Percent Senior Notes Due Twenty Forty Two [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 400.0 |  |
Interest rate on borrowings outstanding |  |  |  | 5.40% |
Senior Notes | Five Point Seven Five Percent Senior Notes Due Twenty Forty Four [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 1,000.5 |  |
Interest rate on borrowings outstanding |  |  |  | 5.75% |
Senior Notes | Five Point Eight Five Percent Senior Notes Due Twenty Forty Four [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  |  | 400.0 |  |
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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