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Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2014
Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] |
| Successor
($ millions) | September 30, 2014 |  | Accumulated Amortization |  | December 31, 2014
Amortizable intangible assets: |  |  |  |  |
Backlog | $ | 54.6 |  |  | $ | (3.2 | ) |  | $ | 51.4 |
Customer relationships | 68.9 |  |  | (1.1 | ) |  | 67.8 |
Total | $ | 123.5 |  |  | $ | (4.3 | ) |  | $ | 119.2 |
Nonamortizable intangible assets: |  |  |  |  |
Excess reorganizational value | $ | 137.2 |  |  |  |  | $ | 137.2 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | The amount of amortization expense for intangible assets in each of the succeeding years is estimated to be as follows (in millions):
2015 | $ | 12.6 |
2016 | 12.4 |
2017 | 10.4 |
2018 | 9.7 |
2019 | 9.6 |
Thereafter | 64.5 |
| $ | 119.2 |

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- Definition Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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