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Income Taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Contingency [Line Items]        
Amount of unrecognized deferred tax liability $ 693us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries      
Deferred tax assets, goodwill 150.0us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets      
Valuation allowance, amount 304.5us-gaap_DeferredTaxAssetsValuationAllowance 279.5us-gaap_DeferredTaxAssetsValuationAllowance    
Change in valuation allowance, deferred tax asset 25.0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount      
Net operating loss carryforwards 2,700us-gaap_OperatingLossCarryforwards      
Credit carryforward 42.0us-gaap_TaxCreditCarryforwardAmount      
Unrecognized tax benefit 191.2us-gaap_UnrecognizedTaxBenefits 174.7us-gaap_UnrecognizedTaxBenefits 132.4us-gaap_UnrecognizedTaxBenefits 162.9us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that impact effective tax rate 115.4us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 120.4us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Accrued interest and penalties 72.3us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued 65.6us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued    
Interest expense (income) related to uncertain tax positions 2.2us-gaap_IncomeTaxExaminationInterestExpense 0.5us-gaap_IncomeTaxExaminationInterestExpense (9.1)us-gaap_IncomeTaxExaminationInterestExpense  
Estimated change in unrecognized tax benefits possible within next 12 months, lower bound 97us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound      
State and local jurisdiction        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards 2,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
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Foreign country        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards 700us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
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Capital loss carryforward 88.0myl_CapitalLossCarryforward
/ us-gaap_IncomeTaxAuthorityAxis
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Foreign country | Carried forward indefinitely        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 450us-gaap_OperatingLossCarryforwards
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