Segmental Reporting (Revenues and Accounts Receivable by Major Customers) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Product sales	$ 6,099.9	$ 5,830.4	$ 4,757.5
Customer concentration risk
Revenue, Major Customer [Line Items]
Revenue by major customer, percent	47.00%
Cardinal Health Inc.
Revenue, Major Customer [Line Items]
Product sales	$ 796.9	979.9	$ 853.7
Accounts receivable by major customer	$ 181.7	$ 164.5
Revenue by major customer, percent	13.00%	17.00%	18.00%
McKesson Corp.
Revenue, Major Customer [Line Items]
Product sales	$ 1,044.1	$ 1,021.0	$ 902.9
Accounts receivable by major customer	$ 193.1	$ 179.4
Revenue by major customer, percent	17.00%	18.00%	19.00%
AmerisourceBergen Corp
Revenue, Major Customer [Line Items]
Product sales	$ 1,048.3	$ 759.2	$ 721.0
Accounts receivable by major customer	$ 171.5	$ 134.9
Revenue by major customer, percent	17.00%	13.00%	15.00%

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.9)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.5)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Article 5

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 275
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Topic 825
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
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