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Acquisition - Assets Acquired and Liabilities Assumed (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 17, 2012
Business Acquisition [Line Items]        
Goodwill $ 22.9us-gaap_Goodwill $ 22.9us-gaap_Goodwill $ 22.8us-gaap_Goodwill  
Davenport [Member]        
Business Acquisition [Line Items]        
Cash       0.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Accounts receivable       21.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Other receivables       3.9core_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherReceivables
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Inventory       20.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Prepaid expenses / other assets       2.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Property, plant and equipment       5.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Intangible assets       2.6us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Goodwill       6.7us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Net deferred tax liabilities       (1.0)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Capital lease liability       (10.9)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Other liabilities       (9.8)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember
Total consideration       $ 41.2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= core_DavenportMember