(2) For purposes of distribution of property pursuant to this Section, all pension benefits (including pension benefits under the Illinois Pension Code, defined benefit plans, defined contribution plans and accounts, individual retirement accounts, and non-qualified plans) acquired by or participated in by either spouse after the marriage and before a judgment of dissolution of marriage or legal separation or declaration of invalidity of the marriage are presumed to be marital property. A spouse may overcome the presumption that these pension benefits are marital property by showing through clear and convincing evidence that the pension benefits were acquired by a method listed in subsection (a) of this Section. The right to a division of pension benefits in just proportions under this Section is enforceable under Section 1-119 of the Illinois Pension Code.
The value of pension benefits in a retirement system subject to the Illinois Pension Code shall be determined in accordance with the valuation procedures established by the retirement system.
The recognition of pension benefits as marital property and the division of those benefits pursuant to a Qualified Illinois Domestic Relations Order shall not be deemed to be a diminishment, alienation, or impairment of those benefits. The division of pension benefits is an allocation of property in which each spouse has a species of common ownership.