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Financial Instruments and Risk Management (as restated) - Fair Value and Carrying Value of Debt (Details) - USD ($) | Dec. 31, 2020 | Mar. 02, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Dec. 22, 2017 | Nov. 30, 2016
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Revolving Credit Facility | Term Loan Due 2027 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Stated interest rate |  | 1.00% |  |  |  |
Aggregate principal amount |  | $ 2,200,000,000.0 |  |  |  |
Revolving Credit Facility | Term Loan Due 2023 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | $ 325,000,000.0 | $ 2,320,000,000.0
Notes Payable to Banks | 9.250% Notes due 2024 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Stated interest rate | 9.25% |  | 9.25% |  |  |
Aggregate principal amount |  |  | $ 750,000,000.0 |  |  |
Notes Payable to Banks | 10.00% Notes due 2024 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Stated interest rate |  |  |  | 10.00% |  |
Aggregate principal amount |  |  | 120,000,000.0 |  |  |
Senior Notes | 12.00%/13.00% Senior PIK Toggle Notes due 2022 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash interest rate, stated percentage | 12.00% |  |  | 12.00% |  |
PIK interest rate, stated percentage | 13.00% |  |  | 13.00% |  |
Aggregate principal amount |  |  | $ 500,000,000.0 |  |  |
Fair Value | Revolving Credit Facility | Term Loan Due 2027 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | $ 2,169,900,000 |  |  | $ 0 |  |
Fair Value | Revolving Credit Facility | ABL Revolving Credit Facility |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | 0 |  |  | 145,200,000 |  |
Fair Value | Revolving Credit Facility | Term Loan Due 2023 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | 0 |  |  | 2,064,800,000 |  |
Fair Value | Notes Payable to Banks | 9.250% Notes due 2024 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | 0 |  |  | 805,300,000 |  |
Fair Value | Notes Payable to Banks | 10.00% Notes due 2024 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | 0 |  |  | 127,500,000 |  |
Fair Value | Senior Notes | 12.00%/13.00% Senior PIK Toggle Notes due 2022 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | 0 |  |  | 517,500,000 |  |
Par Value | Revolving Credit Facility | Term Loan Due 2027 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | 2,183,500,000 |  |  | 0 |  |
Par Value | Revolving Credit Facility | ABL Revolving Credit Facility |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | 0 |  |  | 145,200,000 |  |
Par Value | Revolving Credit Facility | Term Loan Due 2023 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | 0 |  |  | 2,070,000,000.0 |  |
Par Value | Notes Payable to Banks | 9.250% Notes due 2024 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | 0 |  |  | 750,000,000.0 |  |
Par Value | Notes Payable to Banks | 10.00% Notes due 2024 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | $ 0 |  |  | 120,000,000.0 |  |
Stated interest rate | 10.00% |  |  |  |  |
Par Value | Senior Notes | 12.00%/13.00% Senior PIK Toggle Notes due 2022 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Debt, fair value disclosure | $ 0 |  |  | $ 500,000,000.0 |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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