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Intangible Assets Schedule of Intangible Assets and Excess Reorganization Value (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets, gross | $ 123.5 | $ 123.5 |
Accumulated intangible asset amortization | (30.2) | (17.7) |
Amortizable intangible assets, net | 93.3 | 105.8 |
Excess reorganization value |  |  | $ 137.2
Impairment of excess reorganization value | $ 0.0 | (137.2) |
Average useful life of finite-lived intangible assets | 15 years |  |
Contract-Based Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets, gross | $ 54.6 | 54.6 |
Accumulated intangible asset amortization | (19.9) | (12.0) |
Amortizable intangible assets, net | 34.7 | 42.6 |
Customer-Related Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets, gross | 68.9 | 68.9 |
Accumulated intangible asset amortization | (10.3) | (5.7) |
Amortizable intangible assets, net | $ 58.6 | $ 63.2 |

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