Business Combinations (Dyax Pro Forma Information) (Details) - Dyax - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Revenues	$ 11,402.5	$ 6,503.8
Net income from continuing operations	$ 792.2	$ 1,056.6
Net income from continuing operations per share - basic	$ 1.03	$ 1.79
Net income from continuing operations per share - diluted	$ 1.02	$ 1.78
Increase/(decrease) to net income to reflect acquisition related costs	$ 111.1	$ (111.1)
Increase/(decrease) to net income to reflect the fair value adjustment to acquisition date inventory.		(5.4)
An adjustment to increase amortization of intangible assets	$ 1.3	21.6
Decrease to net income to reflect the additional interest expense		$ (81.6)