Business Combinations (Dyax Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Millions	Jan. 22, 2016	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Non-current assets:
Goodwill		$ 14,850.6	$ 4,147.8	$ 4,289.6	$ 2,474.9
Dyax
Current assets:
Cash and cash equivalents	$ 241.2
Accounts receivable, net	22.5
Inventories	20.2
Other current assets	8.1
Total current assets	292.0
Non-current assets:
Property, plant and equipment, net	5.8
Goodwill	2,688.8
Other non-current assets	28.6
Total assets	7,675.2
Current liabilities:
Accounts payable and accrued expenses	30.0
Other current liabilities	1.7
Non-current liabilities:
Deferred tax liability	1,312.1
Other non-current liabilities	1.4
Total liabilities	1,345.2
Preliminary fair value of identifiable assets acquired and liabilities assumed	6,330.0
Preliminary fair value of purchase consideration	6,330.0
Currently marketed products | Dyax
Non-current assets:
Other intangible assets, net	135.0
In-Process Research and Development (IPR&D) | Dyax
Non-current assets:
Other intangible assets, net	4,100.0
Royalty rights | Dyax
Non-current assets:
Other intangible assets, net	$ 425.0