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Liabilities Subject to Compromise (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Apr. 01, 2017
--- | --- | ---
Fresh-Start Adjustment [Line Items] |  |  |
Debt | [1] |  | $ 8,077.4
Interest payable |  |  | 172.6
Environmental liabilities |  |  | 61.9
Trade payables |  |  | 55.2
Postretirement benefit obligations | [2] |  | 23.0
Other accrued liabilities |  |  | 26.6
Liabilities subject to compromise |  |  | 8,416.7
First Lien, Second Lien And Unsecured Debt |  |  |
Fresh-Start Adjustment [Line Items] |  |  |
Debt |  |  | 7,768.3
Prepetition Letters Of Credit | Derivative Contract Termination |  |  |
Fresh-Start Adjustment [Line Items] |  |  |
Debt |  |  | $ 257.3
Prepetition Letters Of Credit | Secured Debt |  |  |
Fresh-Start Adjustment [Line Items] |  |  |
Debt |  | $ 51.8 |
[1] | Includes $7,768.3 million of first lien, second lien and unsecured debt, $257.3 million of derivative contract terminations, and $51.8 million of liabilities secured by prepetition letters of credit at April 1, 2017.
[2] | Includes liabilities for unfunded non-qualified pension plans, all the participants of which are former employees.

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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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- Definition The amount of environmental remediation liabilities included in 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 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=64805424&loc=d3e55717-112764 Reference 2: 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 Reference 3: 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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