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PENSION AND POSTRETIREMENT BENEFITS - Schedule of Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 27, 2018 | May 28, 2017 | May 29, 2016
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | $ 2,983.6 |  |
Fair value of plan assets at end of year | 3,355.1 | $ 2,983.6 |
Pension Benefits |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at beginning of year | 3,548.7 | 3,903.0 |
Service cost | 42.8 | 56.9 | $ 93.8
Interest cost | 111.1 | 116.8 | 159.8
Plan participants' contributions | 0.0 | 0.0 |
Amendments | 0.6 | 5.5 |
Actuarial gain | (9.4) | (51.5) |
Plan settlements | (10.2) | (287.5) |
Special termination benefits | 0.0 | 1.5 |
Curtailments | (79.5) | (18.1) |
Benefits paid | (181.3) | (169.7) |
Currency | 0.8 | (0.8) |
Business divestitures | 0.0 | (7.4) |
Benefit obligation at end of year | 3,423.6 | 3,548.7 | 3,903.0
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 2,983.6 | 2,959.4 |
Actual return on plan assets | 276.1 | 346.1 |
Employer contributions | 312.6 | 163.0 |
Plan participants' contributions | 0.0 | 0.0 |
Plan settlements | (10.2) | (287.5) |
Investment and administrative expenses | (26.5) | (26.7) |
Benefits paid | (181.3) | (169.7) |
Currency | 0.8 | (1.0) |
Fair value of plan assets at end of year | 3,355.1 | 2,983.6 | 2,959.4
Other Benefits |  |  |
Change in Benefit Obligation |  |  |
Benefit obligation at beginning of year | 156.9 | 201.7 |
Service cost | 0.2 | 0.3 | 0.4
Interest cost | 3.9 | 4.6 | 7.5
Plan participants' contributions | 4.7 | 4.7 |
Amendments | (17.2) | 0.0 |
Actuarial gain | (13.2) | (32.0) |
Plan settlements | 0.0 | 0.0 |
Special termination benefits | 0.0 | 0.0 |
Curtailments | 0.0 | 0.0 |
Benefits paid | (16.2) | (19.0) |
Currency | 0.2 | (0.2) |
Business divestitures | 0.0 | (3.2) |
Benefit obligation at end of year | 119.3 | 156.9 | 201.7
Change in Plan Assets |  |  |
Fair value of plan assets at beginning of year | 0.0 | 0.1 |
Actual return on plan assets | 3.7 | 0.0 |
Employer contributions | 11.5 | 14.2 |
Plan participants' contributions | 4.7 | 4.7 |
Plan settlements | 0.0 | 0.0 |
Investment and administrative expenses | 0.0 | 0.0 |
Benefits paid | (16.2) | (19.0) |
Currency | 0.0 | 0.0 |
Fair value of plan assets at end of year | $ 3.7 | $ 0.0 | $ 0.1

X
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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