By Greg Iacurci Source: CNBC Pension plans for the largest U.S. companies are at their healthiest in more than a decade — and that’s largely good news for the workers who participate in such plans, said retirement experts. Public companies in the S&P 500 stock index had an average pension “funded ratio” of 102% as of Sept. 21, according to data tracked by financial services firm Aon. That’s the highest level since at least the end of 2011, when [...]