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PENSION AND POSTRETIREMENT BENEFITS - Components of Pension and Postretirement Plan Costs (Benefits) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 27, 2022 | Feb. 28, 2021 | Feb. 27, 2022 | Feb. 28, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Total pension cost (benefit) | $ (11.0) | $ (8.4) | $ (32.2) | $ (23.5)
Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Service cost | 2.0 | 2.7 | 6.7 | 9.0
Interest cost | 20.9 | 21.7 | 62.5 | 65.1
Expected return on plan assets | (36.4) | (35.0) | (109.1) | (105.0)
Amortization of prior service cost (benefit) | 0.5 | 0.5 | 1.4 | 1.7
Total pension cost (benefit) | (13.0) | (10.1) | (38.5) | (29.2)
Postretirement Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Service cost | 0.1 | 0.0 | 0.2 | 0.1
Interest cost | 0.3 | 0.4 | 1.0 | 1.1
Amortization of prior service cost (benefit) | (0.5) | (0.5) | (1.4) | (1.5)
Recognized net actuarial gain | (0.9) | (0.8) | (2.7) | (2.6)
Total pension cost (benefit) | (1.0) | (0.9) | (2.9) | (2.9)
Multi-employer plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Total pension cost (benefit) | $ 2.0 | $ 1.7 | $ 6.3 | $ 5.7

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: 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=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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