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Intangible Assets Schedule of Intangible Assets and Excess Reorganization Value (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Mar. 15, 2013 | Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items] |  |  |
Excess reorganization value |  | $ 6.8 us-gaap_Goodwill |
Average useful life of finite-lived intangible assets | 15 years |  |
Contract-Based Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets |  |  | 54.6 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractBasedIntangibleAssetsMember
Successor [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets | 119.2 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 123.5 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Accumulated amortization | (4.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Excess reorganization value | 137.2 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 137.2 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Successor [Member] | Contract-Based Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets | 51.4 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractBasedIntangibleAssetsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 54.6 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractBasedIntangibleAssetsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Accumulated amortization | (3.2)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_ContractBasedIntangibleAssetsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Successor [Member] | Customer-Related Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets | 67.8 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelatedIntangibleAssetsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  | 68.9 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelatedIntangibleAssetsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember
Accumulated amortization | (1.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelatedIntangibleAssetsMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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