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Gain on Settlement of Liabilities Subject to Compromise (Details) - USD ($) $ in Millions | Apr. 01, 2017 | Dec. 31, 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 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 | 0.7 |  |
Successor Additional paid-in capital | $ 1,774.9 |  |

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- Definition Amount of reorganization items related to legal and advisory professional fees related to entities in bankruptcy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64805424&loc=d3e55730-112764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766 + Details
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- Definition Amount of write-off of debt issuance costs and debt discounts related to prepetition debt obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64805424&loc=d3e55730-112764 + Details
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- Definition Total amount of liabilities subject to compromise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=64805424&loc=d3e55717-112764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6918054&loc=d3e56015-112765 + Details
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