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PENSION AND POSTRETIREMENT BENEFITS - Schedule of Fair Value of Plan Assets, Summarized by Level (Details) - USD ($) $ in Millions | May 26, 2019 | May 27, 2018
--- | --- | ---
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | $ 3,601.5 | $ 3,355.1
Cash and cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 78.4 | 66.0
U.S. equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 148.1 | 443.8
International equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 88.2 | 257.5
Government bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 748.3 | 1,854.8
Corporate bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 2,255.5 | 4.7
Mortgage-backed bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 31.1 | 9.3
Real estate funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.4 | 7.7
Master limited partnerships |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets |  | 0.4
Net receivables for unsettled transactions |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 5.6 | 10.9
Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 150.8 | 596.3
Level 1 | Cash and cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.7 | 1.0
Level 1 | U.S. equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 56.3 | 319.8
Level 1 | International equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 87.8 | 256.5
Level 1 | Government bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 1 | Corporate bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 1 | Mortgage-backed bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 1 | Real estate funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.4 | 7.7
Level 1 | Master limited partnerships |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets |  | 0.4
Level 1 | Net receivables for unsettled transactions |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 5.6 | 10.9
Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 3,204.8 | 2,058.8
Level 2 | Cash and cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 77.7 | 65.0
Level 2 | U.S. equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 91.8 | 124.0
Level 2 | International equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.4 | 1.0
Level 2 | Government bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 748.3 | 1,854.8
Level 2 | Corporate bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 2,255.5 | 4.7
Level 2 | Mortgage-backed bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 31.1 | 9.3
Level 2 | Real estate funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 2 | Master limited partnerships |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets |  | 0.0
Level 2 | Net receivables for unsettled transactions |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 3 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 3 | Cash and cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 3 | U.S. equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 3 | International equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 3 | Government bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 3 | Corporate bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 3 | Mortgage-backed bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 3 | Real estate funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Level 3 | Master limited partnerships |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets |  | 0.0
Level 3 | Net receivables for unsettled transactions |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Total |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 3,355.6 | 2,655.1
Measured at net asset value |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | $ 245.9 | $ 700.0

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