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PENSION AND POSTRETIREMENT BENEFITS - Schedule of Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
May 28, 2017
May 29, 2016
Retirement Benefits [Abstract]    
Projected benefit obligation $ 3,433.6 $ 3,809.5
Accumulated benefit obligation 3,357.1 3,734.6
Fair value of plan assets $ 2,851.4 $ 2,862.9