X0306 4 2021-05-04 false 0000105770 WEST PHARMACEUTICAL SERVICES INC WST 0001168581 LAI GOLDMAN MYLA 530 HERMAN O. WEST DRIVE EXTON PA 19341 true false false false Common Stock 2021-05-04 4 A false 577.00 A 16540.93 D These shares of restricted stock units will vest in full on the first anniversary of the date of grant and will be distributable under the terms of the Deferred Compensation Plan for Outside Directors. Reflects additional shares purchased through dividend reinvestments based on most recent plan statement. Ryan Metz as Agent for Myla Lai-Goldman 2021-05-06