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Reorganization Items, Net (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2017 | Apr. 01, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment, Reorganization Gain, Net | $ 3,031.2 |  |  |  |  |  |  |  |
Legal and Advisory Professional Fees | 336.4 |  |  |  |  |  |  |  |
Payments of Reorganization Professional Fees | 8.3 |  |  |  |  |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment, Reorganization Gain, Net |  | $ 3,031.2 |  |  |  |  |  | $ 0.0 |
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity, before Tax |  | (3,363.1) |  |  |  |  |  | 0.0 |
Fresh-Start Income Tax Adjustments, Increase (Decrease) in Expense |  | (253.9) |  |  |  |  |  | 0.0 |
Net Loss on Rejection of Leases and Other Executory Contracts |  | 0.0 |  |  |  |  |  | (75.2) |
Legal and Advisory Professional Fees |  | 42.5 |  |  |  |  |  | 88.4 |
Gain on Settlement of Other Claims, Net |  | 0.7 |  |  |  |  |  | 1.8 |
Interest Income on Accumulated Cash |  | 0.4 |  |  |  |  |  | 1.8 |
Other Expense (Income) |  | 0.0 |  |  |  |  |  | (1.0) |
Reorganization Items, net | 585.8 | 627.2 | $ 41.4 | $ 33.9 | $ 29.7 | $ 95.4 |  | 159.0 | $ 0.0
Payments for Reorganization Items, Net |  | $ 45.8 |  |  |  |  |  | $ 68.1 |
Predecessor | Income Tax Effect Related to Predecessor Deferred Tax Liabilities [Member] |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |
Fresh-Start Income Tax Adjustments, Increase (Decrease) in Expense | (177.8) |  |  |  |  |  |  |  |
Predecessor | Income Tax Effect Related to AOCI [Member] |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |
Fresh-Start Income Tax Adjustments, Increase (Decrease) in Expense | (81.5) |  |  |  |  |  |  |  |
Predecessor | Income Tax Effect Related to Unrecognized Tax Benefits [Member] |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |
Fresh-Start Income Tax Adjustments, Increase (Decrease) in Expense | (6.7) |  |  |  |  |  |  |  |
Predecessor | Income Tax Effect Related to Predecessor Deferred Tax Assets of Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |
Fresh-Start Income Tax Adjustments, Increase (Decrease) in Expense | $ 12.1 |  |  |  |  |  |  |  |
Successor |  |  |  |  |  |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |  |  |  |  |  |
Reorganization Items, net |  |  |  |  |  |  | $ 0.0 |  |
Payments of Reorganization Professional Fees |  |  |  |  |  |  | $ 240.0 |  |

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