This excerpt taken from the PBI 10-K filed Feb 26, 2009.
13. Retirement Plans and Postretirement Medical Benefits
We have several defined benefit and defined contribution retirement plans covering substantially all employees worldwide. Benefits are primarily based on employees compensation and years of service. Our contributions are determined based on the funding requirements of U.S. federal and other governmental laws and regulations. We use a measurement date of December 31 for all of our retirement plans.
U.S. employees hired after January 1, 2005, Canadian employees hired after April 1, 2005, and U.K. employees hired after July 1, 2005, are not eligible for our defined benefit retirement plans.
We contributed $32.1 million, $30.5 million and $28.1 million to our U.S. defined contribution plans in 2008, 2007 and 2006, respectively.