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Earnings Per Share (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Calculation of Numerator and Denominator in Earnings Per Share    
Income from continuing operations, net of taxes $ 412.9us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 253.1us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Loss from discontinued operations, net of taxes (2.5)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax (22.7)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income $ 410.4us-gaap_NetIncomeLoss $ 230.4us-gaap_NetIncomeLoss
Schedule of Weighted Average Number of Shares    
Basic (in shares) 589.1us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1] 584.3us-gaap_WeightedAverageNumberOfSharesOutstandingBasic [1]
Effect of dilutive shares:    
Share based awards to employees (in shares) 3.6us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [2] 4.5us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements [2]
Diluted (in shares) 592.7us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 588.8us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Share Awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 1.4us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember		 [3] 0.8us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockCompensationPlanMember		 [3]
[1] Excludes shares purchased by the EBT and presented by Shire as treasury stock
[2] . Calculated using the treasury stock method
[3] Certain stock options have been excluded from the calculation of diluted EPS because (a) their exercise prices exceeded Shire plc’s average share price during the calculation period or (b) the required performance conditions were not satisfied as at the balance sheet date.