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PENSION AND POSTRETIREMENT BENEFITS - Schedule of Fair Value of Plan Assets, Summarized by Level (Details) - USD ($) $ in Millions | May 27, 2018 | May 28, 2017
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | $ 3,355.1 | $ 2,983.6
Fair value measurement of pension plan assets in the fair value hierarchy | 2,655.1 | 1,678.3
Investments measured at net asset value | 700.0 | 1,305.3
Cash and cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 66.0 | 95.0
U.S. equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 443.8 | 507.7
International equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 257.5 | 263.1
Government bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 1,854.8 | 275.4
Corporate bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 4.7 | 283.9
Mortgage-backed bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 9.3 | 69.5
Real estate funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 7.7 | 9.5
Master limited partnerships |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.4 | 173.5
Net payables for unsettled transactions |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 10.9 | 0.7
Level 1 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 596.3 | 1,047.4
Level 1 | Cash and cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 1.0 | 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 | 319.8 | 494.0
Level 1 | International equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 256.5 | 249.9
Level 1 | Government bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 51.1
Level 1 | Corporate bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 4.4
Level 1 | Mortgage-backed bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 63.3
Level 1 | Real estate funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 7.7 | 9.5
Level 1 | Master limited partnerships |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.4 | 173.5
Level 1 | Net payables for unsettled transactions |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 10.9 | 0.7
Level 2 |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 2,058.8 | 630.9
Level 2 | Cash and cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 65.0 | 94.0
Level 2 | U.S. equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 124.0 | 13.7
Level 2 | International equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 1.0 | 13.2
Level 2 | Government bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 1,854.8 | 224.3
Level 2 | Corporate bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 4.7 | 279.5
Level 2 | Mortgage-backed bonds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 9.3 | 6.2
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 | 0.0
Level 2 | Net payables 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 | 0.0
Level 3 | Net payables for unsettled transactions |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | $ 0.0 | $ 0.0

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