Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items).

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Asset Impairments, Restructuring, and Other Special Charges (Details) - USD ($) $ in Millions	3 Months Ended									12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Unusual or Infrequent Item [Line Items]
Asset Impairment Charges										$ 226.7	$ 243.2	$ 30.0
Severance Costs										141.0	225.5	90.6
Asset impairment, restructuring, and other special charges		$ 144.9	$ 42.4	$ 72.4	$ 108.0	$ 401.0	$ 36.3	$ 0.0	$ 31.4	367.7	468.7	120.6
PUERTO RICO
Unusual or Infrequent Item [Line Items]
Asset Impairment Charges						$ 180.8
Human Pharmaceutical Products [Member]
Unusual or Infrequent Item [Line Items]
Asset Impairment Charges										24.6	204.4	30.0
Severance Costs										81.5	225.5	90.6
Animal Health Products [Member]
Unusual or Infrequent Item [Line Items]
Asset Impairment Charges										202.1	38.8	0.0
Severance Costs										$ 59.5	$ 0.0	$ 0.0
Subsequent Event [Member] \| Animal Health Products [Member] \| IRELAND
Unusual or Infrequent Item [Line Items]
Asset Impairment Charges	$ 100.0