Putting environmental, social, and governance options in retirement plans also improves how employees view their employers, says survey.

"Employers are budgeting higher due to uncertainty and the anticipation that inflationary pressures will increase the cost of health care services," says Debbie Ashford North America chief actuary for health solutions at Aon.

"In times of grave talent shortages, rehires are on the rise and considered an untapped source of talent for organizations. Data suggests that today's boomerang employees typically return to their previous employers reenergized, armed with new skills and ready to renegotiate their terms."