Shire Income Access Share Trust Statement of Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Net income	$ 865.0	$ 588.0	$ 491.6
Shire Income Access Share Trust [Member]
Dividend income	67.6	58.3	45.9
Net income	$ 67.6	$ 58.3	$ 45.9