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Receivables (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Trade receivables $ 96.1us-gaap_AccountsReceivableGrossCurrent $ 69.2us-gaap_AccountsReceivableGrossCurrent
Interest receivables 0.2us-gaap_InterestReceivableCurrent 0.2us-gaap_InterestReceivableCurrent
Income Taxes Receivable 1.4us-gaap_IncomeTaxReceivable 1.2us-gaap_IncomeTaxReceivable
Other receivables 11.7us-gaap_OtherReceivablesGrossCurrent 8.6us-gaap_OtherReceivablesGrossCurrent
Allowance for doubtful accounts (1.0)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (1.1)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Total $ 108.4us-gaap_ReceivablesNetCurrent $ 78.1us-gaap_ReceivablesNetCurrent