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Taxation (Details - Other Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2012
Taxation - Other Details [Line Items]      
Unrecognized tax benefits that would create a temporary difference between the reported amount and its tax basis $ 0us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate $ 0us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate $ 0us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Amount of change in unrecognized tax benefit within 12 months   0us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit  
Ireland      
Taxation - Other Details [Line Items]      
Tax Credit Carryforward, Valuation Allowance 24.7us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_IE
47.0us-gaap_TaxCreditCarryforwardValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_IE
 
Deferred tax asset carryforwards components      
Deferred tax on foreign tax credit carryforwards 14.4pre_DeferredTaxAssetsTaxCreditCarryforwardsForeignAfterAllocationOfValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_IE
10.1pre_DeferredTaxAssetsTaxCreditCarryforwardsForeignAfterAllocationOfValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_IE
 
Deferred tax on operating loss carryforwards 1.7pre_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpirationAfterAllocationOfValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_IE
3.1pre_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpirationAfterAllocationOfValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_IE
 
Singapore [Member]      
Taxation - Other Details [Line Items]      
Operating Loss Carryforwards, Valuation Allowance 21.4us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_SG
20.0us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_SG
 
US [Member]      
Deferred tax asset carryforwards components      
Deferred tax on foreign tax credit carryforwards 3.6pre_DeferredTaxAssetsTaxCreditCarryforwardsForeignAfterAllocationOfValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_US
   
Carryforward period 10 years    
Canada      
Taxation - Other Details [Line Items]      
Operating Loss Carryforwards, Valuation Allowance   1.1us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_CA
 
Switzerland      
Deferred tax asset carryforwards components      
Deferred tax on operating loss carryforwards   $ 10.3pre_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpirationAfterAllocationOfValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= country_CH
 
Carryforward period   7 years