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Chapter 11 Proceedings and Ability to Continue as Going Concern - Schedule of Liabilities Subject to Compromise (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Apr. 30, 2021 | Dec. 31, 2020 | Aug. 18, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Liabilities Subject To Compromise, Accrued Interest On Notes | $ 203.5 |  | $ 201.9 |
Liabilities Subject To Compromise, Holding Cost, Inclusive Of Interest | 13.9 |  |  |
Liabilities Subject to Compromise | 0.0 | $ 0.0 | $ 7,313.7 |
Senior Notes [Member] | 6.875% Senior notes due 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 6.875%
Liabilities Subject To Compromise, Long-term Debt | 122.9 |  |  |
Senior Notes [Member] | Four Point Seven Zero Percent Senior Notes Due Twenty Twenty One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 4.70%
Liabilities Subject To Compromise, Long-term Debt | 100.7 |  |  |
Senior Notes [Member] | Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 4.875%
Liabilities Subject To Compromise, Long-term Debt | 620.8 |  |  |
Senior Notes [Member] | Three Point Zero Percent Exchangeable Senior Notes Due Twenty Twenty Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 3.00%
Liabilities Subject To Compromise, Long-term Debt | 849.5 |  |  |
Senior Notes [Member] | Four Point Five Percent Senior Notes Due Twenty Twenty Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 4.50%
Liabilities Subject To Compromise, Long-term Debt | 303.4 |  |  |
Senior Notes [Member] | Four Point Seven Five Percent Senior Notes Due Twenty Twenty Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 4.75%
Liabilities Subject To Compromise, Long-term Debt | 318.6 |  |  |
Senior Notes [Member] | Eight Point Zero Percent Senior Notes Due Twenty Twenty Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 8.00%
Liabilities Subject To Compromise, Long-term Debt | 292.3 |  |  |
Senior Notes [Member] | Five Point Two Zero Percent Senior Notes Due Twenty Twenty Five [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 5.20%
Liabilities Subject To Compromise, Long-term Debt | 333.7 |  |  |
Senior Notes [Member] | Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 7.375%
Liabilities Subject To Compromise, Long-term Debt | 360.8 |  |  |
Senior Notes [Member] | Seven Point Seven Five Percent Senior Notes Due Twenty Twenty Six [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 7.75%
Liabilities Subject To Compromise, Long-term Debt | 1,000.0 |  |  |
Senior Notes [Member] | Seven Point Two Zero Percent Debentures Due Twenty Twenty Seven [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 7.20%
Liabilities Subject To Compromise, Long-term Debt | 112.1 |  |  |
Senior Notes [Member] | Seven Point Eight Seven Five Percent Senior Notes Due Twenty Forty [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 7.875%
Liabilities Subject To Compromise, Long-term Debt | 300.0 |  |  |
Senior Notes [Member] | Five Point Four Zero Percent Senior Notes Due Twenty Forty Two [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 5.40%
Liabilities Subject To Compromise, Long-term Debt | 400.0 |  |  |
Senior Notes [Member] | Five Point Seven Five Percent Senior Notes Due Twenty Forty Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 5.75%
Liabilities Subject To Compromise, Long-term Debt | 1,000.5 |  |  |
Senior Notes [Member] | Five Point Eight Five Percent Senior Notes Due Twenty Forty Four [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding |  |  |  | 5.85%
Liabilities Subject To Compromise, Long-term Debt | 400.0 |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Liabilities Subject To Compromise, Long-term Debt | $ 581.0 |  |  |

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