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Asset Retirement Obligation - Schedule of Change in Asset Retirement Obligation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
As of December 31, 2014 $ 36.6us-gaap_AssetRetirementObligationsNoncurrent
Accretion expense 0.6us-gaap_AssetRetirementObligationAccretionExpense
Additions 0.1us-gaap_AssetRetirementObligationLiabilitiesIncurred
Liabilities settled (0.3)us-gaap_AssetRetirementObligationLiabilitiesSettled
Foreign currency translation adjustments (0.6)us-gaap_AssetRetirementObligationForeignCurrencyTranslation
As of March 31, 2015 $ 36.4us-gaap_AssetRetirementObligationsNoncurrent