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Emergence from the Chapter 11 Cases and Fresh Start Reporting - Liabilities Subject to Compromise (Details) - USD ($) $ in Millions | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | ---
Fresh-Start Adjustment [Line Items] |  |
Debt | $ 8,077.4 | $ 8,080.3
Interest payable | 172.6 | 172.6
Environmental liabilities | 61.9 | 61.9
Trade payables | 55.2 | 58.4
Postretirement benefit obligations | 23.0 | 34.6
Other accrued liabilities | 26.6 | 32.4
Liabilities subject to compromise | 8,416.7 | 8,440.2
First Lien, Second Lien And Unsecured Debt |  |
Fresh-Start Adjustment [Line Items] |  |
Debt | 7,768.3 | 7,771.2
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

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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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