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PENSION AND POSTRETIREMENT BENEFITS - Schedule of Fair Value of Plan Assets, Summarized by Level (Details) - USD ($) $ in Millions | May 31, 2020 | May 26, 2019
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Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | $ 3,820.4 | $ 3,601.5
Level 1 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 196.6 | 150.8
Level 2 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 3,382.8 | 3,204.8
Level 3 |  |
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 | 3,579.4 | 3,355.6
Measured at net asset value |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 241.0 | 245.9
Cash and cash equivalents |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 82.0 | 78.4
Cash and cash equivalents | Level 1 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 10.1 | 0.7
Cash and cash equivalents | Level 2 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 71.9 | 77.7
Cash and cash equivalents | Level 3 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
U.S. equity securities |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 146.1 | 148.1
U.S. equity securities | Level 1 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 63.9 | 56.3
U.S. equity securities | Level 2 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 82.2 | 91.8
U.S. equity securities | Level 3 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
International equity securities |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 93.1 | 88.2
International equity securities | Level 1 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 92.4 | 87.8
International equity securities | Level 2 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.7 | 0.4
International equity securities | Level 3 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Government bonds |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 743.9 | 748.3
Government bonds | Level 1 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Government bonds | Level 2 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 743.9 | 748.3
Government bonds | Level 3 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Corporate bonds |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 2,461.7 | 2,255.5
Corporate bonds | Level 1 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Corporate bonds | Level 2 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 2,461.7 | 2,255.5
Corporate bonds | Level 3 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Mortgage-backed bonds |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 22.4 | 31.1
Mortgage-backed bonds | Level 1 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Mortgage-backed bonds | Level 2 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 22.4 | 31.1
Mortgage-backed bonds | Level 3 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Real estate funds |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.4
Real estate funds | Level 1 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.4
Real estate funds | Level 2 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Real estate funds | Level 3 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Net receivables for unsettled transactions |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 30.2 | 5.6
Net receivables for unsettled transactions | Level 1 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 30.2 | 5.6
Net receivables for unsettled transactions | Level 2 |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Total pension plan assets | 0.0 | 0.0
Net receivables for unsettled transactions | Level 3 |  |
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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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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