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Intangible Assets (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2015
Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] |
| March 31, 2015 |  | December 31, 2014
| (millions)
Amortizable intangible assets: |  |  |
Backlog | $ | 54.6 |  |  | $ | 54.6 |
Customer relationships | 68.9 |  |  | 68.9 |
Amortizable intangible assets, gross | $ | 123.5 |  |  | $ | 123.5 |
Accumulated amortization | (8.3 | ) |  | (4.3 | )
Amortizable intangible assets, net | $ | 115.2 |  |  | $ | 119.2 |
Nonamortizable intangible assets: |  |  |
Excess reorganizational value | $ | 137.2 |  |  | $ | 137.2 |

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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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