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Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation: The condensed consolidated financial statements included in this report are unaudited and have been prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“U.S. GAAP”) for interim financial reporting and U.S. Securities and Exchange Commission (“SEC”) regulations. The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by U.S. GAAP. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. In the opinion of management, these financial statements include all adjustments, which are of a normal recurring nature, necessary for a fair statement of the financial position, results of operations, cash flows and the change in equity for the periods presented. The condensed consolidated financial statements for the three months ended March 31, 2016 should be read in conjunction with the consolidated financial statements and notes thereto of West Pharmaceutical Services, Inc. (which may be referred to as “West”, “the Company”, “we”, “us” or “our”) appearing in our Annual Report on Form 10-K for the year ended December 31, 2015 (“2015 Annual Report”). The results of operations for any interim period are not necessarily indicative of results for the full year. Segment Reporting: Beginning in 2016, we changed our organization and reporting structure for our next phase of growth and development, which resulted in a change to Proprietary Products and Contract-Manufactured Products as our reportable segments. Segment results presented in the accompanying condensed consolidated financial statements and related notes have been retroactively adjusted to reflect the impact of this change. Please refer to Note 14, Segment Information, for additional details.