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Property, Plant and Equipment Property, Plant and Equipment (Tables) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 48.1us-gaap_PropertyPlantAndEquipmentGross    
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment (44.4)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment    
Property, Plant and Equipment, Net 3.7us-gaap_PropertyPlantAndEquipmentNet    
Predecessor [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross   305.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment   297.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Property, Plant and Equipment, Net   7.9us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
 
Successor [Member]      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross     3.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment     0.2us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
Property, Plant and Equipment, Net $ 3.7us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
  $ 3.5us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember