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Property, Plant and Equipment Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2014
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment |
| Successor |  |  | Predecessor
($ millions) | December 31, 2014 |  |  | December 31, 2013
Property, plant and equipment, gross | $ | 3.7 |  |  |  | $ | 305.1 |
Accumulated depreciation | (0.2 | ) |  |  | (297.2 | )
Property, plant and equipment, net | $ | 3.5 |  |  |  | $ | 7.9 |
Property, Plant and Equipment, Sales |
| Successor |  |  | Predecessor
| 3 Mos. Ended Dec. 31, 2014 |  |  | 9 Mos. Ended Sep. 30, 2014
Sales of assets and property | $ | 1.8 |  |  |  | $ | 8.9 |
Less: asset retirements and related sales expenses | 0.5 |  |  |  | 3.2 |
Net gains on sales of assets and property | $ | 1.3 |  |  |  | $ | 5.7 |
Cash proceeds received | $ | 2.1 |  |  |  | $ | 8.4 |

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- Definition Tabular disclosure of all information related to any significant acquisition and disposal. Disclosure may include methodology and assumptions, type of asset, asset classification, useful life, useful purpose, acquisition cost, method of acquisition or disposal, depreciation method, gain (loss) on disposal pretax and net of tax, date of acquisition or disposal and restrictions on amount of proceeds from donated assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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