Segment Reporting (Revenues and Accounts Receivable by Major Customers) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Product sales	$ 14,448.9	$ 10,885.8	$ 6,099.9
AmerisourceBergen Corp
Segment Reporting Information [Line Items]
Product sales	1,408.1	1,695.3	1,048.3
Amounts outstanding	469.9	427.2
McKesson Corp.
Segment Reporting Information [Line Items]
Product sales	1,333.1	1,336.7	1,044.1
Amounts outstanding	512.4	312.9
Cardinal Health Inc.
Segment Reporting Information [Line Items]
Product sales	1,079.2	1,052.2	$ 796.9
Amounts outstanding	$ 325.3	$ 278.4
Product Sales \| Customer Concentration Risk \| AmerisourceBergen Corp
Segment Reporting Information [Line Items]
% Product sales	10.00%	16.00%	17.00%
Product Sales \| Customer Concentration Risk \| McKesson Corp.
Segment Reporting Information [Line Items]
% Product sales	9.00%	12.00%	17.00%
Product Sales \| Customer Concentration Risk \| Cardinal Health Inc.
Segment Reporting Information [Line Items]
% Product sales	7.00%	10.00%	13.00%

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
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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.

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