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Emergence from the Chapter 11 Cases and Fresh Start Reporting - Impact of Reorganization Adjustments (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 01, 2017 | Apr. 01, 2017 | Jun. 30, 2016 | Jun. 30, 2016
Fresh-Start Adjustment [Line Items] |  |  |  |
Total pre-tax gain on plan effects, see also (j) below | $ 3,031.2 |  |  |
Successor debt issuance costs and other items, see also (f) and (g) above | 50.9 | $ 50.9 |  |
Net impact on accumulated deficit | 5,134.3 | 5,134.3 |  |
Predecessor |  |  |  |
Fresh-Start Adjustment [Line Items] |  |  |  |
Total pre-tax gain on plan effects, see also (j) below | 3,031.2 | 3,031.2 | $ 0.0 | $ 0.0
Cancellation of Predecessor Common Stock | 0.2 | 0.2 |  |
Cancellation of Predecessor Additional paid-in capital | 2,423.9 | 2,423.9 |  |
Cancellation of Predecessor Treasury stock | $ (371.9) | $ (371.9) |  |

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- Definition Amount of fresh-start adjustment to additional paid-in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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- Definition Amount of increase (decrease) in debt issuance costs from fresh-start adjustment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6918054&loc=SL2890621-112765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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