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Taxation (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]      
Change in valuation allowance $ 5.6us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 21.0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 6.2us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Income taxes paid 1.1us-gaap_IncomeTaxesPaid 1.2us-gaap_IncomeTaxesPaid  
Income tax refund     (13.2)us-gaap_ProceedsFromIncomeTaxRefunds
Unrecognized tax benefits 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits  
Interest and penalties accrued on unrecognized tax benefits 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Internal Revenue Service (IRS)      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 65.0us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
   
Ireland      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 10.8us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= country_IE
   
United Kingdom      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 45.5us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= country_GB
   
Singapore      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 3.9us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= country_SG