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Long-term Debt Textuals (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Apr. 01, 2017 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2023 USD ($) | Nov. 30, 2020 USD ($) | Aug. 09, 2018 USD ($) | Apr. 11, 2018 | Sep. 18, 2017 USD ($) | Apr. 03, 2017 USD ($) | Feb. 15, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, adequate protection payments |  |  |  |  |  |  |  |  | $ 29,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  |  |  |  |  | 92,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost | $ 55,500,000 |  |  |  | $ 68,900,000 |  |  |  |  |  |  | $ 55,500,000 | $ 68,900,000 |  |  |  |  |  |  |  |
Interest expense | 36,800,000 | $ 35,400,000 | $ 36,000,000.0 | $ 35,800,000 | 36,500,000 | $ 38,200,000 | $ 38,300,000 | $ 36,300,000 | 32,900,000 |  | $ 119,700,000 | 144,000,000.0 | 149,300,000 |  |  |  |  |  |  |  |
Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security |  |  |  |  |  |  |  |  | 2,100,000 |  | 541,800,000 | 71,100,000 | 85,000,000.0 |  |  |  |  |  |  |  |
2019 Revolver availability | 498,600,000 |  |  |  |  |  |  |  |  |  |  | 498,600,000 |  |  |  |  |  |  |  |  |
Loss on early debt extinguishment |  |  |  |  |  |  |  |  | 0 |  | (20,900,000) | (200,000) | (2,000,000.0) |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  |  |  |  | $ 45,400,000 |  | $ 10,800,000 | 6,400,000 | 21,200,000 |  |  |  |  |  |  |  |
Capital lease and other obligations | $ 15,200,000 |  |  |  | 40,000,000.0 |  |  |  |  |  |  | $ 15,200,000 | 40,000,000.0 |  |  |  |  |  |  |  |
Senior Notes | 6.000% Senior Secured Notes due March 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 6.00% |  |  |  |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Restricted Payments, Amount Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.00 |  |  |  |
Debt Instrument, Restricted Payments, Principal Amount Used to Calculate Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |
Debt Instrument Repurchase Amount | $ 41,000,000.0 |  |  |  |  |  |  |  |  |  |  | $ 41,000,000.0 |  |  |  |  |  |  |  |  |
Debt Instrument Repurchase Amount, excluding interest | $ 39,900,000 |  |  |  |  |  |  |  |  |  |  | 39,900,000 |  |  |  |  |  |  |  |  |
Write off of Deferred Debt Issuance Cost |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |
Loss on early debt extinguishment |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |  |  |  |  |  |  |  |  |
Senior Notes | 6.375% Senior Secured Notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 6.375% |  |  |  |  |  |  |  |  |  |  | 6.375% |  |  |  |  |  |  |  |  |
Debt Instrument, Restricted Payments, Amount Paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00 |  |  |  |
Debt Instrument, Restricted Payments, Principal Amount Used to Calculate Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |
Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49,500,000
Interest expense |  |  |  |  |  |  |  |  |  |  |  | $ 72,000,000.0 | 71,900,000 |  |  |  |  |  |  |  |
Senior Notes | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Restricted Payments Basket | $ 150,000,000.0 |  |  |  |  |  |  |  |  |  |  | 150,000,000.0 |  |  |  |  | 650,000,000.0 |  |  |  |
Other Expenses |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |
Debt Instrument, Restricted Payments Basket, Annual Limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000.0 |  |  |  |
2013 Revolver | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance cost | 4,700,000 | 5,700,000 |  |  |  |  |  |  |  | $ 5,700,000 |  | 4,700,000 |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | 7,200,000 |  |  |  |  |  |  |  |
Unrestricted Cash, Net Limit | 800,000,000.0 |  |  |  |  |  |  |  |  |  |  | 800,000,000.0 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 350,000,000.0 | 565,000,000.0 |  |  |  |  |  |  |  | $ 565,000,000.0 |  | $ 350,000,000.0 |  |  |  |  |  |  |  |  |
Financing Facility, Base Interest Rate | 3.375% |  |  |  |  |  |  |  |  |  |  | 3.375% |  |  |  |  |  |  |  |  |
Revolving Credit Facility, Fee on Unused Borrowings | 0.50% |  |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |
Aggregate Letters of Credit, Maximum | $ 66,400,000 |  |  |  |  |  |  |  |  |  |  | $ 66,400,000 |  |  |  |  |  |  |  |  |
2013 Revolver | 2019 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | 6,200,000 |  |  |  |  |  |  |  |  |
Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 400,000,000.0 |  |  |  |  |  |  |  |  |  |  | 400,000,000.0 |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | $ 22,200,000 | 24,000,000.0 |  |  |  |  |  |  |  |
Debt Instrument, Restricted Payments Basket |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,800,000 |  | $ 450,000,000.0 |  |
Other Expenses |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |  |
Floor interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |
Debt Instrument, Voluntary Principal Prepayment | 101.00% |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |
Mandatory principal prepayment, percent of excess cash flow | 75.00% |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |
Mandatory principal prepayment, if required, period payable, threshold |  |  |  |  |  |  |  |  |  |  |  | 100 days |  |  |  |  |  |  |  |  |
Excess proceeds from sales of assets, threshold ($10 million or greater) | $ 10,000,000.0 |  |  |  |  |  |  |  |  |  |  | $ 10,000,000.0 |  |  |  |  |  |  |  |  |
Payment for debt extinguishment or debt prepayment cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 546,000,000.0 |  |  |  |  |  |  |
Debt Instrument, Covenant, Fixed Charge Coverage Ratio |  |  |  |  |  |  |  |  |  |  | 2.00 |  | 2.25 |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  | $ 46,000,000.0 |  |  |  |  | 557,000,000.0 |  |  |  |  |  |  |  |  |
Loss on early debt extinguishment |  |  |  |  |  |  |  |  |  |  | $ 20,900,000 |  | $ (2,000,000.0) |  |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  | 2,000,000.0 |  |  |  |  |  |  |  |
Payments of Debt Issuance Costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |  |
Restricted payments threshold | 450,000,000.0 |  |  |  |  |  |  |  |  |  |  | 450,000,000.0 |  |  |  |  |  |  | $ 50,000,000.0 |  |
Senior Secured Term Loan due 2025, net of original issue discount | Senior Secured Term Loan due 2025, net of original issue discount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original issue discount and deferred finance costs | $ 37,300,000 |  |  |  |  |  |  |  |  |  | $ 6,100,000 | $ 37,300,000 |  |  |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 950,000,000.0 |
Debt Instrument, Redemption, Period One | Senior Notes | 6.000% Senior Secured Notes due March 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  |  |  | 103.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Senior Notes | 6.375% Senior Secured Notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  |  |  | 104.80% |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Senior Notes | 6.000% Senior Secured Notes due March 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  |  |  | 101.50% |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Senior Notes | 6.375% Senior Secured Notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  |  |  | 103.20% |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Three | Senior Notes | 6.375% Senior Secured Notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  |  |  |  |  |  | 101.60% |  |  |  |  |  |  |  |  |
Peabody Investments (Gibraltar) Limited | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral, non-voting capital stock, percent | 100.00% |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Collateral, voting capital stock, percent | 65.00% |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | 2013 Revolver | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |
Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatory principal prepayment, percent of excess cash flow | 50.00% |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |
Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Maximum | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio | 2.00 |  |  |  |  |  |  |  |  |  |  | 2.00 |  |  |  |  |  |  |  |  |
Total Leverage Ratio Less or Equal to 2.00 to 1.00 Greater Than 1.50 to 1.00 | Minimum | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio | 1.50 |  |  |  |  |  |  |  |  |  |  | 1.50 |  |  |  |  |  |  |  |  |
Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatory principal prepayment, percent of excess cash flow | 25.00% |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Maximum | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio | 1.50 |  |  |  |  |  |  |  |  |  |  | 1.50 |  |  |  |  |  |  |  |  |
Total Leverage Ratio Less or Equal to 1.50 to 1.00 Greater Than 1.00 to 1.00 | Minimum | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio | 1.00 |  |  |  |  |  |  |  |  |  |  | 1.00 |  |  |  |  |  |  |  |  |
Total Leverage Ratio Less or Equal to 1.00 to 1.00 | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mandatory principal prepayment, percent of excess cash flow | 0.00% |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |
Total Leverage Ratio | 1.00 |  |  |  |  |  |  |  |  |  |  | 1.00 |  |  |  |  |  |  |  |  |
Total Leverage Ration Less Or Equal 2.00 to 1.00 [Member] | 2013 Revolver | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio | 2.00 |  |  |  |  |  |  |  |  |  |  | 2.00 |  |  |  |  |  |  |  |  |
Total Leverage Ration Less Or Equal 2.00 to 1.00 [Member] | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio | 2.00 |  |  |  |  |  |  |  |  |  |  | 2.00 |  |  |  |  |  |  |  |  |
Total Leverage Ratio Less or Equal 1.25 to 1.00 | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Leverage Ratio | 1.25 |  |  |  |  |  |  |  |  |  |  | 1.25 |  |  |  |  |  |  |  |  |
Dividend payment and stock purchase payment threshold | $ 25,000,000.0 | $ 25,000,000.0 |  |  |  |  |  |  |  | $ 25,000,000.0 |  | $ 25,000,000.0 |  |  |  |  |  |  |  |  |
2013 Revolver | Line of Credit | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 350,000,000.0 |  |  |  |  |  |  |  |  |  |  | $ 350,000,000.0 |  |  |  |  |  |  |  |  |
Geographic Distribution, Domestic [Member] | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral, capital stock, percent | 100.00% |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Export | Senior Notes | 6.00% And 6.375% Senior Secured Notes, Successor Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral, non-voting capital stock, percent | 100.00% |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Collateral, voting capital stock, percent | 65.00% |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |  |  |  |
Effect of Plan | Senior Notes | 6.000% Senior Secured Notes due March 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000.0
Effect of Plan | Senior Notes | 6.375% Senior Secured Notes due March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Effect of Plan | Senior Secured Term Loan due 2025, net of original issue discount | Successor Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 950,000,000.0 |
Forecast | 2013 Revolver | 2017 Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 Revolver commitments, matures 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 540,000,000.0 |  |  |  |  |  |
2019 Revolver commitments, matures 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000.0 |  |  |  |  |

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