Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Calculation of Numerator and Denominator in Earnings Per Share
Income from continuing operations, net of taxes		$ 164.1	$ 528.3	$ 577.0	$ 781.4
Loss from discontinued operations, net of taxes		(4.5)	(5.2)	(7.0)	(27.9)
Net income		$ 159.6	$ 523.1	$ 570.0	$ 753.5
Schedule of Weighted Average Number of Shares
Basic (in shares)	[1]	590.5	586.4	589.8	585.3
Effect of dilutive shares:
Share based awards to employees (in shares)	[2]	2.7	3.9	3.2	5.0
Diluted (in shares)		593.2	590.3	593.0	590.3
Share Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	[3]	1.0	0.3	3.2	1.2

[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.