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Emergence from the Chapter 11 Cases and Fresh Start Reporting - Gain on Settlement of Liabilities Subject to Compromise (Details) - USD ($) $ in Millions | Apr. 01, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fresh-Start Adjustment [Line Items] |  |  |
Liabilities subject to compromise | $ 8,416.7 |  | $ 8,440.2
Less amounts issued to settle claims: |  |  |
Successor Series A Convertible Preferred Stock | (1,305.4) |  |
Issuance of Successor Notes | (1,000.0) |  |
Issuance of Successor Term Loan | (950.0) |  |
Cash payments and accruals for claims and professional fees | (336.4) |  |
Other: |  |  |
Write-off of Predecessor debt issuance costs, see also (e) below | (18.1) |  |
Total pre-tax gain on plan effects, see also (j) below | 3,031.2 |  |
Successor |  |  |
Fresh-Start Adjustment [Line Items] |  |  |
Liabilities subject to compromise |  | $ 0.0 |
Less amounts issued to settle claims: |  |  |
Successor Common Stock (at par) | (0.7) |  |
Successor Additional paid-in capital | $ (1,774.9) |  |

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