Justice BREYER delivered the opinion of the Court.
In 1998, petitioner CIGNA Corporation changed the nature of its basic pension plan for employees. Previously, the plan provided a retiring employee with a defined benefit in the form of an annuity calculated on the basis of his preretirement salary and length of service. The new plan provided most retiring employees with a (lump sum) cash balance calculated on the basis of a defined annual contribution from CIGNA...
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